>>> 'cssem' problem from hsin -- Mon Jan  9 13:23:07 1989 <<<

The liquid N2 feeder is loose. ( The tube can be pulled out!)
This should be tighten.

Wei Hsin

>>> 'cssem' problem from bob -- Mon Jan  9 14:56:37 1989 <<<

The n2 fill on the cssem is a temporary set up. A new metal bellows has
been ordered to replace the one that broke. It will take 1-2 weeks for
the part to come in. The temprorary set up is useable until then.

>>> 'cssem' problem from rnorman -- Tue Jan 10 09:13:11 1989 <<<

Problem: It was reported the the fill hose was broke or not working
         well.

Cause: The teflon fill hose, a temporary fix, was broke at the top
       just before the fitting.

Solution: I replaced the broken hose with a longer teflon hose, because
          the previous was also too short. What caused this to break was
          moving the fill hose after filling the trap; this hose is teflon
          not a bellows, it will break if moved when frozen. So, after filling
          the trap leave it in until the tube thaws out, at leased 10 min.
          As a matter of fact, it doesn't need to be removed until the cssem
          is in use. The SST bellows should be in this week; when it
          is I will install it. The cssem is up.

>>> 'cssem' problem from jimmoon -- Thu Jan 19 20:22:47 1989 <<<

This will take some time to describe.  

I got a call from someone this afternoon asking me if I was
really going to use the SEM this evening.  I presume that it
was Wei Hsin, since he said that he had planned on using it
in the afternoon but that there had been a problem.

The problem, as he described it, was that the cryo chamber
pressure gauge was pegged to the right, indicating that the
dewar was perhaps empty.  I thought that this was a little
strange since I had filled it myself this morning.  Anyway,
he described a procedure that it would be necessary to follow
in order to get things going again.  One might wonder why
he didn't do it himself if he wanted to use the SEM this
afternoon, but I guess it was below him.  So your friendly
bottle-washer/janitor undertook to get things up and going
this evening since we had some samples that we really wanted
to look at.   The following is what I did:

1.  turned ion pump off.

2.  switched vacuum system to manual.

3.  opened cryo gate.

4.  started the roughing pump (he said that it would be necessary
    to vent a little first, and I found this to be true -- the
    roughing pump would not turn on until I had vented a little.
    At no time was the CRYO VENT opened.  Further, I did not
    vent until the specimen drawer opened;  the vent was on only
    momentarily.)

5.  pumped until the cryo chamber pressure was about 3 x 10 ** -4.

6.  closed cryo gate

7.  started filling the dewar

8.  returned vacuum system to automatic

9.  roughing pump off

10. opened cryo gate

11. started ion pump in the usual manner.


Everything up to here went smoothly.  The dewar was still filling,
I was conditioning the tip (note -- at no time was the tip open
to atmosphere), and everything looked great.  

Just as I was finishing filling the dewar, the cryo gate closed 
itself, the cryo chamber gauge pegged to the right again, and I
was back to ground zero, except for the dewar being filled.

I tried getting things pumped down to no avail.

I did not want to take a chance on burning out the ion pump,
so I have left it off for the night.  I have used the roughing
pump to pump down the specimen chamber and the cryo chamber,
and I have returned the system to automatic status.

Reiterating, at no time were the cryo chamber or the tip open to
the atmosphere.  I will come by in the morning to supply any
additional details that I can.

>>> 'cssem' problem from bob -- Fri Jan 20 11:40:11 1989 <<<

The cssem ion pumps refuse to start. They are shorted, an expected mode
of failure after years of use. We tried dumping a charged cap into
them which has worked in the past. We also tied them directly to
the AC line. We were not able to eliminate the short. Nanometrics
field service has been called and the problem reported.
Nanometrics will call back with a time for service. I have
stressed urgency however it is unlikely they will be here
until Monday.

>>> 'cssem' problem from rnorman -- Tue Jan 24 08:10:06 1989 <<<

Allan Lam was in yesterday and replaced all 5 of the lower IP's, he
also compleatly cleaned the lower chamber; it was very dirty. He will
return today it finish and possibly install a sublimator unit if needed.
The cssem should be up by tonight.

>>> 'cssem' problem from tom -- Tue Jan 24 15:22:28 1989 <<<

Problem:   Ion pumps shorted.

Cause:     Old age.  Last time was about 4 years ago.

Solution:  Allen Lam of Nanometrics replaced all 5 ion pumps on the 
           specimen chamber and cleaned out the pump chamber. Every thing
           was baked and the base presure is good.  cssem is up.

>>> 'cssem' problem from hebert -- Fri Feb 17 10:35:05 1989 <<<

I high voltage conditioned to 25kV. I then loaded my sample and
found that the emission current went negative and then the
overload light came on. The tip must be bad.

>>> 'cssem' problem from tom -- Fri Feb 17 10:50:16 1989 <<<

The tip keeps overloading.  When the emmision knob is turned up
the current meter goes down instead of up.  The reading is also 
unstable which I think is the cause.  I believe it has spi
spikes and that causes the overload to come on.  Perhaps the 
electronics are bad, not the tip.  Gun preasure is good and 
the flash seems good.

>>> 'cssem' problem from rnorman -- Tue Feb 21 13:06:16 1989 <<<

I talked with Nanometrics field service and it looks like we have a bad
801 PCB. We have had problem in the past with this board. Alan Lam will
send us up a new 801 PCB which I will install. The PCB will be shipped
out today, so will be here on thursday or so.

>>> 'cssem' problem from rnorman -- Fri Feb 24 14:32:42 1989 <<<

Problem: Overload occures every time the emission current is turned up.

Cause: The 801 PCB failed.

Solution: Nanometrics sent up a replacement board. The cssem was tested
          and is up for use.

>>> 'cssem' problem from lyons -- Sat Feb 25 14:26:01 1989 <<<

was high voltage conditioning the tip and by accident had the
tip raised and not grounded.  at 25 kV heard arcing and the 
computer went haywire and could not reset.  tried to look at
sample but could not get any emission current.  I assume I
blew the tip.  

>>> 'cssem' problem from hsin -- Sat Feb 25 15:29:47 1989 <<<


Did not use it. Just I feel there is something not right with
the roughing pump. I can hear "leaking" and tried to vent the 
chamber again and roughing it , but I can not pump the chamber
down. I hear something is leaking and I don't know where it is
leaking.  Somehow everything is wrong after Don blow the tip!

Therefore I left the sem unpumped and close all the gates and all
the velves. This machine needs to be serviced first thing in the 
Monday morning.

Wei Hsin

>>> 'cssem' problem from rnorman -- Mon Feb 27 13:38:40 1989 <<<

The cssem tip was repalced with tip #7288. The chamber would not rough
down due to a bad o-ring in the Gun Isolation Valve, o-ring #2-247; also,
the oil trap for the rough pump was saturated and needed baking out. The
gun chamber o-ring was in need of replacement also, o-ring #2-254. The 
gun will be bake out tonight and the new tip will be formed in the morning.
This last tip was installed in 7/27/88, it lasted a good while.

>>> 'cssem' problem from rnorman -- Tue Feb 28 08:38:02 1989 <<<

The ion gun turned off last night durring the gun bake. The ion gun was
restarted this morning. I will start another gun bake probably after lunch
and hopefully the gun will not turn off. Most likly, the tip will not
be formed until tomorrow morning.

>>> 'cssem' problem from rnorman -- Tue Feb 28 16:41:15 1989 <<<

The ion pump is in a second gun bake. Tomorrow I will form the tip.
The cssem should be up for use by about 10am.

>>> 'cssem' problem from rnorman -- Wed Mar  1 11:32:29 1989 <<<

Well, bad news. It looks like we have a bad gun ion pump. I called
Alan Lam of Nanometrics and he agrees with me. He will call me back
conserning repair time. If you are in need of looking at samples the
hitsem is workable.

>>> 'cssem' problem from rnorman -- Thu Mar  2 08:17:57 1989 <<<

Alan Lam of Nanometrics will be up tomorrow, 3/3, to rebuild the
gun ion pump. He will not be installing the Digital Image Processor
until about June. So, If Alan does make it up tomorrow the cssem will
be usable monday afternoon.

>>> 'cssem' problem from rnorman -- Mon Mar  6 16:01:41 1989 <<<

Problem: Bad upper ion pump.

Solution: Alan Lam of Nanometrics came in and replaced the pump.
          The tip was formed today and is up for operation.

NOTE: This is a new tip and only LOW VOLTAGE can be used for 1 week.

>>> 'cssem' problem from tom -- Tue Mar  7 11:54:55 1989 <<<

Ion pump valve leaks severly.

>>> 'cssem' problem from rnorman -- Wed Mar  8 07:44:10 1989 <<<

The cssem will be down to clean the lower hi-vac valve.

>>> 'cssem' problem from rnorman -- Wed Mar  8 13:39:17 1989 <<<

The lower poppet valve alignment bracket was out of place; the screws
that hold on the bracket came out. The poppet was not even closing
all the way. The poppet valve o-ring was repalced, 2-369; and the 
adaptor flange between the chamber and the ion pumps o-ring was replaced,
2-381. The lower ion pumps will need to be baked out now; the cssem will
be operational by about 9:pm tonight.

>>> 'cssem' problem from rnorman -- Thu Mar  9 07:40:14 1989 <<<

Problem: When venting the chamber the ion pumps dumped.

Cause: The lower poppet valve was not closing all the way due
       to the alignment bracket not being in place.

Solution: The chamber and lower ion pumps were vented. The whole upper
          chamber assembly was removed and the alignment bracket was
          replaced and tighened down tight. I also replaced the poppet
          valve o-ring, 2-369; and the lower adapter flange o-ring, 2-381.
          Durring this time the upper ion was still under hi-vacuum.
          Tom baked out the lower ion pumps and this morning everything is
          running well. The cssem is up.

>>> 'cssem' problem from hebert -- Wed Mar 15 16:37:26 1989 <<< [No Comment]
>>> 'cssem' problem from tom -- Mon Apr  3 09:29:58 1989 <<<

Gun presure is high, even after the weekend bake. 5-6 uA.
I will do a gun bake today.

>>> 'cssem' problem from lyons -- Mon Apr 17 10:03:25 1989 <<<

was operating the sem at HV for about an hour when the tip
blew while I was adjusting the stage position.  the emmision
current was 25-30 mA, the tip was a full turn up and the tip
had been conditioned for an hour at 25kV before using.
sorry.

>>> 'cssem' problem from rnorman -- Mon Apr 17 11:45:26 1989 <<<

The blown tip, 7288, has been removed and a new tip, 7058, was installed.
I will start the Gun IP and bake it out today; tomorrow morning I
will form the new tip. The cssem should be up for low voltage operation
by noon.

>>> 'cssem' problem from tom -- Tue Apr 18 11:39:41 1989 <<<

Tip has been formed.  I am now HV conditioning the tip and the cssem
will be up for LOW VOLTAGE mode after lunch.  Low voltage mode only
until 

Tuesday Apr 25.

>>> 'cssem' problem from hebert -- Mon May  8 17:06:07 1989 <<<

Contrast is bad at both low and high voltage. This tip isn't very good.

>>> 'cssem' problem from jimmoon -- Tue May  9 21:58:06 1989 <<<

Lousy contrast.  Unusable, actually.  Sort of like looking
at a polar bear in a snowstorm.

>>> 'cssem' problem from rnorman -- Thu May 11 08:01:03 1989 <<<

The tip has been replaced  with tip # 7085. I looked at the old tip
under a scope and the end of it was bent, no wonder we were getting
a snowy picture. The gun and new tip will be baked out today and
tomorrow morning I will form the new tip. As for what caused the
tip to be bent, it could have came that way from the factory.
The cssem should be operating by 10AM tomorrow.

>>> 'cssem' problem from rnorman -- Fri May 12 14:47:29 1989 <<<

Problem: Snowy picture.

Cause: The end on the tip was bent as seen by a microscope.

Solution: A new tip, #7085, was installed and formed.
        The cssem is up for use with LOW VOLTAGE ONLY
        until next friday.

>>> 'cssem' problem from hsin -- Thu May 25 12:26:05 1989 <<<

Dave Hebert filled too much liquid nitrogen and the whole cold
trap freeze out!!  Ice all over the cold trap. I already told him
that he should put "auto" mode instead of "mannul" mode. Therefore
he will not make mistake next time.

Cold trap needs to warm up and taken apart and clean and change new
O-rings. I wonder if Robert Norman will come in tomorrow ( Friday )?
I have one sample need to be looked at. However I can wait until 
the SEM is up.

Wei Hsin

>>> 'cssem' problem from tom -- Fri May 26 09:09:58 1989 <<<

Problem: LN trap overfilled. O-ring seal leaked.

c
Cause: Dave Hebert.

Solution: Let it warm up.  Pump out LN trap. Refill. cssem is up.

>>> 'cssem' problem from hebert -- Wed May 31 19:30:45 1989 <<<

The emm
The emission current overloads when the pot is set to give a
current greater than 20.

>>> 'cssem' problem from tom -- Fri Jun  2 10:33:34 1989 <<<

Problem: 
Problem:  User reports not able to operate above 20 uA.

Cause:    Could not duplicate problem.

Solution: My good Karma I guess.

>>> 'cssem' problem from rnorman -- Fri Jun  2 11:44:43 1989 <<<

Problem: Current overlimit when the emission current is
         turned above 20.

Cause: The overlimit setpoint was low.

Solution: Adjusted the overlimit setpoint on the 8020-1030 board
          located in the high voltage box, it has only 1 trim-pot
          on the board. It will now overlimit at 45 on the emission
          current dial. The cssem works well and is ready for use.

>>> 'cssem' problem from rnorman -- Fri Jun  9 12:48:25 1989 <<<

As a reminder the cssem will be down all next week to install the
Digital Image Processor and the Dual O-Ring Gun. So, if you need
some pictures you will need to get them today or over the weekend.

>>> 'cssem' problem from tang -- Sat Jun 10 18:56:43 1989 <<<

The red nitrogen tank is empty. Liquid N2 must be poured into
the cryo manually. I have filled the cryo as of 7pm Saturday
night. Otherwise, everything is normal.

>>> 'cssem' problem from jimmoon -- Mon Jun 12 08:27:51 1989 <<<

Picture quality has been pretty lousy, despite gun bakes
Friday and Saturday nights.  Also, in order to get the desired
emission current it has been necessary to turn the tip down
dangerously close to being grounded and to use the emission
control above 600 (about 650).
My general impression is that the imaging capabilities of the
SEM have deteriorated significantly in the last half year or more.
I hope that the upgrade being installed this week will also
upgrade the resolving power and imaging capability of the machine.
Right now it is pretty useless for features less than about 5 microns.

>>> 'cssem' problem from rnorman -- Mon Jun 12 09:45:09 1989 <<<

The upgrade will not be done today because Nanometrics Field  Service
was not able to make it up. The upgrade will start tomorrow morning
at 8:30 AM. 
    
     Note: The cssem is open for use today!

>>> 'cssem' problem from hebert -- Mon Jun 12 14:50:52 1989 <<<

The tip blew at 20 kV. The cssem id down.

>>> 'cssem' problem from rnorman -- Tue Jun 13 08:56:45 1989 <<<


Problem: Tip blew

Solution: The old tip, #7085, was replaced by tip #7093.
          Alan Lam is here to install the DIP and the  
          Double O-ring gun. The tip will be formed tomorrow
          morning.

>>> 'cssem' problem from rnorman -- Tue Jun 13 08:59:51 1989 <<<

Alan Lam from Nanometrics is here to install the Digital Image
retrofit and the double o-ring gun. The cssem will be down for
the rest of the week.

>>> 'cssem' problem from rnorman -- Thu Jun 15 16:48:33 1989 <<<

The Digital Image retro-fit is going well and the double o-ring gun
has been installed.  Vacuum is very good and the pictures are quite
well also.  We are having problems getting the voltage to show up on
the CRT computer, which Alan will work on tomorrow. You will be
informed on the progress.

>>> 'cssem' problem from rnorman -- Fri Jun 16 14:55:47 1989 <<<

Problem: The Digital Image Processor and the Double O-ring gun was
         to be installed.

Solution: Both the above items were installed and tested by Nanomentric.
          The cssem  is up. See Tom Booth to learn how to use the DIP.

>>> 'cssem' problem from tom -- Fri Jun 16 15:00:34 1989 <<<

The DIP has been installed and is working but the monitor is bad. I have 
connected a monitor so the cssem can be used over the weekend.  The monitor
is sitting on the cssem and will make it possible to run if necessary though
it will be slightly dificult to use. The Image Processing should not interfere
with normal operation. I will instruct users in it's operation next week.

The cssem is up for use.

>>> 'cssem' problem from rnorman -- Mon Jun 19 14:30:20 1989 <<<

Alan returned and replaced the computer monitor and made some small
adjustments. Also while looking at some pictures he blew the tip, this 
was his tip form the double o-ring gun he brought in; so, the tip was
replaced. Tomorrow Alan will return with our new tip from the gun he replaced
and do more video adjustments and form the tip we put in today. The cssem 
should be open for use by late afternoon tomorrow, you will be informed exactly.

>>> 'cssem' problem from rnorman -- Tue Jun 20 15:43:18 1989 <<<

Problem: Upgrade to Digital Image Processor and FE II gun.

Solution: After installation the VDT went out in the computer, which 
          Alan replaced. Also, the AGC Board was replaced and the 
          video signal was adjusted.  The contrast is still not up
          to upgrade standard and Alan said  the detector assembly is
          not good.  So later next week Alan will return with a new
          detector.  The cssem is up for use, see Tom for instructions
          on how to use the DIP.

>>> 'cssem' problem from rnorman -- Tue Jun 20 16:41:29 1989 <<<

Problem: LN2 Poly-line from tank broke.

Cause: From connecting/ removing the LN2 tank with the line
       twisted up; it broke right at the fitting.

Solution: The fitting was replaced and the line reconnected.
          The cssem is up.

>>> 'cssem' problem from tom -- Thu Jun 29 14:02:31 1989 <<<

The cssem is not taking pictures properly. rnorman will be calling
nanometrics for service

>>> 'cssem' problem from rnorman -- Wed Jul  5 11:02:05 1989 <<<

Nanometrics will be up this friday to repair the cssem problems with the
video: not taking pictures properly.

>>> 'cssem' problem from bob -- Thu Jul  6 14:17:24 1989 <<<

Nanometrics worked on the video section of the camera. Alan Lam ran
into problems and has removed two boards and returned to Nanometrics to
trouble shoot them on his test bench. He will return tomorow to replace 
them. In the meantime, the cssem remains down.

>>> 'cssem' problem from bob -- Mon Jul 10 08:48:41 1989 <<<

Problem: Upon completing the addition of the DIP and the replacement
         of the gun a assembly with a double o-ring upgraded gun the
         nanospec failed toproduce an image with the picture quality
         expected. In additioon the camera crt's output was
	 bad.
Cause:   The video timing board and bad phospher on the pmt
	 window.
Solution:The video baords were taken to nanometrics for service
	 and returned. Alan Lam also replaced the phosphor
	 for the pmt and has loaned us his pmt until a new
	 one arrives. The cssem is up for use with a greatly
	 improved image. The DIP works well however it
	 cannot be used with the annotation, a design
	 limitation.

>>> 'cssem' problem from rnorman -- Mon Jul 10 16:20:56 1989 <<<

Problem: The coaxial connector on the "photo" unit came disconnected.

Solution: After finding a very small coaxial connecter I tracked down the
          very small crimping tool the new connector was installed.
          The cssem is up.

>>> 'cssem' problem from tom -- Fri Jul 21 15:48:08 1989 <<<

Focus distance display (working distance) does not work. 
This leads to inaccurate measurments. cssem is up but the 
measurment is not calibrated.

>>> 'cssem' problem from bob -- Thu Jul 27 15:14:34 1989 <<<

Tom Thompson of Nanometrics repaired the focus distance display.
The cssem is up however there are still problems with the grid
on the detector phosphor. This will be repaired next week by Alan 
Lam. The cssem is up and operational now.

>>> 'cssem' problem from yctai -- Thu Jul 27 18:14:25 1989 <<<

The image suddenly disappeared while I was taking photos.
I found the current was zero and overload light was on.
I shut down the system. The chamber was in high vacuum.
I think the tip just burned out.

>>> 'cssem' problem from rnorman -- Fri Jul 28 07:41:05 1989 <<<

Problem: The tip overloaded and turned off the image.

Cause: When ever the tip draws too much current, above a setpoint,
       the system will overload and shut down the tip; this is what
       happened.  I tested the cssem and got emission current on the 
       tip.  The cssem is up.

>>> 'cssem' problem from jimmoon -- Fri Jul 28 16:29:18 1989 <<<

No current, no image.

After 30 minutes of successful operation, there was a loud 
snapping sound.  The picture immediately reappeared on the
screen and operation was seemingly normal.

After changing samples and starting up again, the view down into
the chamber appeared as normal.  While dialing up to the 
high voltage focus, the current overloaded.  After this point
neither Tom nor I could get any current or image.
Gun pressure was very low, as it had been all along.
Generally this pressure would be high if the tip had blown.
Tom and I are scratching our heads.

>>> 'cssem' problem from rnorman -- Mon Jul 31 09:45:01 1989 <<<

I checked out the cssem and the tip is blown.  So, it was replaced
with #7155 and is now pumping down.  Tomorrow morning the tip will
be formed and it should be up for LOW VOLTAGE operation by 10AM.

>>> 'cssem' problem from rnorman -- Tue Aug  1 09:50:18 1989 <<<

Problem: Bad tip, not emission current.

Solution: The tip was replaced with tip #7155 and formed today.
          The cssem is up for LOW VOLTAGE operation until the end
          of this week.

>>> 'cssem' problem from rnorman -- Fri Aug 11 08:48:55 1989 <<<

Problem: Image drifts when the tool boxes go by.

Solution: Some mu metal shielding was lined inside the gun shielding.
          This new magnetic shielding will retard image drifts due to
          magnetic interference when the tech's tool boxes are rolled by.
          The cssem is up.

>>> 'cssem' problem from hsin -- Fri Sep  1 11:56:18 1989 <<<

I could not find the image. Try all positions but the lettle hole
can not be found.  Try to crank up the current but does not work.
There seems no current!  But when the dial goes to the very end (
largest scale) the overload red light turns on.  Tom tryed several
times but does not work either.  The tip may be blown while high
voltage condition or during the tip flash. ( I flash the tip for 
four times contineously.  I do not know whether the tip can sustain
4 times flash? )

Wei Hsin

>>> 'cssem' problem from rnorman -- Fri Sep  1 13:35:04 1989 <<<

The cssem tip was replaced with tip #7156. I looked at the old tip
under a microscope and it looks good except for one spot on the base
on the point; it looks like it arced and created a crater. Tuesday
the tip will be formed and hopefully up for use by 9am.

>>> 'cssem' problem from rnorman -- Wed Sep  6 15:02:46 1989 <<<

The cssem is still down; I am waiting for a green tip from Nano,
we usually use yellow tips.  It should be in tomorrow, if not
I will install our yellow type.

>>> 'cssem' problem from rnorman -- Thu Sep  7 11:25:55 1989 <<<

The new "green" tip has arrived, #7329, and was installed. The green
tips are a better tip at low voltage then the yellow tips; so, we are
testing this green tip to see if it works better for us. The cssem
will be baked out and the tip formed tomorrow morning.

>>> 'cssem' problem from rnorman -- Fri Sep  8 12:10:27 1989 <<<

Problem: Blown tip(s).

Cause: Tip #7155 had no emission current, usually caused by a blown tip,
       so tip #7156 was installed, but it had no emission also.  Looking
       at 7156 under a microscope it was a bad tip, like it was
       blown.  I called Alan Lam at Nanometrics and he sent us a
       "green" tip, higher quality then the "yellow" we usually get.
        
Solution: The "green" tip was installed yesterday and baked out. 
          Today the tip was formed, after 3.5 hours of babying.
          These tips take a little longer to form then the old
          yellow type, but I can say it looks like a much better
          tip.  Users can operate at 20microamp @ 3.5 turns out;
          this will keep you between 500-600 on the emission dial.
          (the range you want to operate between) The cssem is up
          for use, PLEASE USE CAUTION. LOW VOLTAGE UNTIL 9/15.

          Use comments to let me know how this green tip operates.

>>> 'cssem' problem from rnorman -- Tue Sep 19 08:47:27 1989 <<<

Problem: The cssem was totally shut down.`

Cause: I found the "Utility Outlets" breaker off and the fuse F2,
       a 10 amp slo-blo, also was popped; the fuse is on the back
       of the Electron Gun Control box.   

Solution: After the utility breaker was reset I saw the lights in the
          lab dim, like a large generator was being started and drawing
          lots of power.  The vacuum was still very good as if the system
          was shut down just before I arrived.  The cssem is now operating 
          fine and a hi-voltage conditioning is being ran.

>>> 'cssem' problem from tom -- Tue Sep 19 14:42:34 1989 <<<

Computer will not come on. First it was reseting itself every 5 sec. and 
then it died. Fuse looks ok.

>>> 'cssem' problem from rnorman -- Wed Sep 20 07:58:40 1989 <<<

Problem: Computer monitor will not come on.

Cause: unknown, possible a glitch.

Solution: The computer power was turned off when I arrived so
          I unplugged it, checked the line fuse and plugged it 
          back in.  The power was turned on and an image was
          on screen.  The cssem is up.

>>> 'cssem' problem from tom -- Wed Sep 20 13:47:38 1989 <<<

Computer locking up again.

>>> 'cssem' problem from rnorman -- Fri Sep 22 08:18:46 1989 <<<

Problem: Computer locked up again.

Solution: It's working good this morning.  Tom back out the gun
          and today vacuum is very good.  The tip was Hi-volt conditioned
          and the cssem is up.

>>> 'cssem' problem from tang -- Wed Sep 27 21:10:40 1989 <<<

There is no image on the screen--although the DIP seems to
be functioning. Computer seems O.K. Just no image at all.
Moving the tip around in either x or y directions didn't help.
Vacuum is good, emission current is around 17 to 20.

A blown tip, maybe??

>>> 'cssem' problem from tang -- Wed Sep 27 21:40:26 1989 <<<

same problem as earlier reported.

>>> 'cssem' problem from rnorman -- Thu Sep 28 08:24:42 1989 <<<

Well I have some real bads news, the tip is blown.  When I came
in this morning the tip was grounded; if current is applied the
tip will blow.  Also, there is no record of the tip being hi-volt
conditioned before operation, this will blow a tip in a microsec.
The tip is not blown if the user can get emission current.
It looks like to me the tip was blow due to operator error. These
tips cost $200 each and when it is replace it takes a whole week
for the new tip to get up to par.  THE USER *MUST* BE MORE CAREFUL.
A new tip was installed # 7336, yellow.

>>> 'cssem' problem from rnorman -- Fri Sep 29 12:17:08 1989 <<<

Problem: Blown tip.

Solution: Last night the tip was installed and baked out. Today
          the tip was formed and is ready for LOW VOLTAGE operation.
          It will need to be conditioned first before use.  Use
          LOW Voltage until next friday. The cssem is up.

>>> 'cssem' problem from hebert -- Fri Sep 29 15:38:01 1989 <<<

The emission current is very unstable.

>>> 'cssem' problem from rnorman -- Mon Oct  2 08:22:14 1989 <<<

Problem: Emission current unstable.

Cause: New tip; a little unstableness is normal.

Solution: I flashed the tip and it was unstable for about
          5 min. after that, but then ran much better. The
          tip was conditioned and the LN2 trap filled. The 
          cssem is up.

>>> 'cssem' problem from tom -- Mon Oct  2 10:55:31 1989 <<<

Main monitor has no vert control. Picture is flipping. The camera screen
is fine so it appears to be the monitor, not the DIP or anything else.

>>> 'cssem' problem from rnorman -- Mon Oct  2 13:12:20 1989 <<<

The video monitor is out with no vertical sync.  I called Nanometric
and they will send us up a monitor ASAP.  The cssem will be down for
use until it is replaced, possibly Wednesday.

>>> 'cssem' problem from bob -- Mon Oct  2 13:15:25 1989 <<<

The cssem has a problem with its monitor. A new one is being sent up 
to use from Nanometrics. It will be installed first thing tomorow
morning.

>>> 'cssem' problem from rnorman -- Wed Oct  4 07:01:24 1989 <<<

The gun is being baked out since the monitor has not arrived yet.
When it does arrive it will be installed and you will be notified.

>>> 'cssem' problem from rnorman -- Wed Oct  4 14:56:05 1989 <<<

The monitor was shipped out late and should be here tomorrow.
You will be informed when the cssem is up.

>>> 'cssem' problem from tom -- Thu Oct  5 16:02:12 1989 <<<

Problem:      Monitor lost vertical hold. 

Cause:        Age, normal use, who knows, it's only the monitor not the tip.

Solution:     New monitor recieved and installed by Robert Norman. One with
              a pretty emerald color, not orange like our last one.
              cssem is up for LOW VOLTAGE operation. Late tomorrow it
              should be up for high voltage.

>>> 'cssem' problem from tom -- Wed Oct 11 10:49:12 1989 <<<

Tip blew!!!!!!!!!!!  HV cond. was comp[leted about 45 min. before.
Gun was baked last night, pres. was good. Tip was flashed just before
operating. Current was quite unstable the other day (Monday).
Bad sign.

>>> 'cssem' problem from rnorman -- Wed Oct 11 15:00:02 1989 <<<

A new tip was installed, #7295. It will be form tomorrow, until
then the cssem is down.
From tang Wed Oct 11 17:18:27 1989
Received: by argon (5.57/1.16)
	id AA06455; Wed, 11 Oct 89 17:18:22 PDT
Date: Wed, 11 Oct 89 17:18:22 PDT
From: tang (William Tang)
Message-Id: <8910120018.AA06455@argon>
To: rnorman
Subject: cssem
Cc: howe@aslan, tang, voros
Status: R

Hi Rob,

Recently, the tip gets blown very frequently. I'm very concern,
because I depend on using it quite a bit. So I checked out the
problem history on the cssem. And here's what I found:

Date    Operator(s)             Problem
7/28    Jim Moon/Tom Booth      Blown tip
9/1     Wei Hsin                Blown tip
9/27    Tang (myself)           Blown tip
10/11   Tom Booth               Blown tip

I am very skeptical that all these instances were caused by 
operator errors. All of us are VERY careful and conscientious
lab users. 

May I suggest a thorough investigation on the cssem? Perhaps
we can lower the current limit, such that the overload protection
will kick in at a lower current level.

If the problem is not identified, I would hesitate to operate the
cssem even when I get requalified.

You were right in pointing out that blowing the tip is a major
problem in jeopardizing productivity. Let's hope that the 
problem can be identified soon.

Thanks for your attention!

Bill


>>> 'cssem' problem from rnorman -- Thu Oct 12 14:50:25 1989 <<<

Problem: Blown tip.

Cause: Correct Sublimation procedure was not known.

Solution: The new tip was form and is ready for LOW VOLTAGE
          OPERATION.  I found out by Nanometrics Product Support
          that we should SUBLIMATE EVERYDAY even if not needed.
          The actual pressure around the tip is higher then what
          the "GUN PRESSURE" says; so sublimation is necessary to
          bring the pressure down.  The cssem is up.
          Sublination and conditioning was done.

          NOTE: Gun Sublimation must be down everyday needed or not.
                This must be put in comments along with conditioning. 

>>> 'cssem' problem from tom -- Thu Dec  7 16:22:01 1989 <<<

Tip blew. I had been running it for about 1 hr. and I was adjusting
the x-y position of the tip after lowering to increase the current
when it blew. Sorry Jiahua.

>>> 'cssem' problem from rnorman -- Fri Dec  8 08:42:41 1989 <<<

Problem: Tip blew after adjusting the x-y position.

Cause: Talking with Nanometrics, if the tip is adjusted too low
       to get increased current the tip could short while adjusting the
       x-y position.  I believe this was the cause of the tip blowing.

Solution: The tip was replaced, #7409 green, and the gun is now being
          baked out.  The tip will not be up until monday, at which
          time I will form the tip.  NOTE: As of this point on DO NOT
          ADJUST the tip BELOW 1 turn.  It is better to have a low
          current image, then no image at all due to a blown tip.

>>> 'cssem' problem from rnorman -- Fri Dec  8 08:58:53 1989 <<<

A new tip was installed and the gun is being baked out.  DO NOT
OPERATE!

>>> 'cssem' problem from rnorman -- Mon Dec 11 10:25:44 1989 <<<

Problem: Blown tip.

Solution: The tip was replaced on friday morning and baked out 3 times
          durring that day.  Today the tip was sublimated and formed, in
          a very careful way.  The setting  of the tip is at 4 turns up
          at 20 microamps (normal operation).  NOTE: LOW VOLTAGE
          OPERATION UNTIL 12/18.  The cssem was suplimated and
          conditioned.  It is now up for use.

>>> 'cssem' problem from phillip -- Fri Feb 16 09:53:58 1990 <<<

Paul Nelson filled the ln2 dewar for this machine (#3)

>>> 'cssem' problem from tang -- Wed Mar 21 19:56:56 1990 <<<

After roughing down to acceptable pressure, I crossed over to
ion pump and cryo pump. However, the cryo gate refused to open,
although the ion pump alone brought the pressure down to 10E-6.

Although the pressure was good, I decided not to continue until 
the problem is identified. My sample is still in the chamber.

I've HV conditioned and flashed the tip, even I've not opened the
gun isolation at all. Also, I've filled LN trap.

>>> 'cssem' problem from rnorman -- Thu Mar 22 07:13:09 1990 <<<

Problem: The Cryo LN2 valve will not open after roughing out.

Cause: If the pressure in the cryo chamber it too high the
       valve will not open.

Solution: To get the Cryo valve open:  Try filling  the 
          cryo trap and wait a couple minutes.  Tang
          see me concerning this problem.  The cssem is up.

>>> 'cssem' problem from tom -- Wed May  9 11:35:21 1990 <<<

System overloads at 20 microamps. Should be 35 or 40.

>>> 'cssem' fix from rnorman -- Wed May  9 13:43:53 1990 <<<

Problem: System overloads at 20 microamps on the emission.

Solution: I checked out the emission and for me it overloaded at
         40 microamps which is normal.  An intermittent overload at
         20 microamps may be an indication that the 801 board is failing.
         We will keep our eye on this problem.  The cssem is up.
