>>> 'lpe1' problem from bob -- Wed Feb  1 14:47:47 1989 <<<

The H2 purifier appears to be down and needs attention.
From phillip Thu Feb  9 09:28:52 1989
Received: by argon (5.57/1.16)
	id AA04871; Thu, 9 Feb 89 09:28:50 PST
Date: Thu, 9 Feb 89 09:28:50 PST
From: phillip (Phill Guillory)
Message-Id: <8902091728.AA04871@argon>
To: rosal
Subject: Re:  cost of hydrogen
Cc: myra, spivey
Status: RO

 Hello. Since you asked, the system we have going is this:

 A bottle of Untrapure Hydrogen is $21.75. Rosemary orders the
UHP H2 from Atlas Welding. The reserve tanks and the empties are
all kept in the courtyard behind the building. The building 
recieving department brings up full bottles and returns the 
empties as I request this done (by e-mail).
 The monthly bill from Atlas is ~$250.00 . Some months Atlas
sends no bill and some months they send 10 bills so the billing
is somewhat erratic. As Rosemary recieves the bills, she recharges
Wang's group. 
 If you intend to commence shouldering some of the H2 charges when
you start using the system, Rosemary has worked out a method of
recharging you also. Please see her if this is the case.

I hope this answers your question. If not, stop by and we can
discuss it.
Phill Guillory

From rosal Tue Mar 28 11:20:56 1989
Received: by argon (5.57/1.16)
	id AA12723; Tue, 28 Mar 89 11:20:54 PST
Date: Tue, 28 Mar 89 11:20:54 PST
From: rosal (Rosa Leon)
Message-Id: <8903281920.AA12723@argon>
To: phillip
Subject: lpe1
Status: RO

Did the part come in for the purifier?  let me know if there
is anything I can do to help gettin it back up.
Rosa


>>> 'lpe1' problem from phillip -- Wed Mar 29 14:51:10 1989 <<<

P: H2 purifier not working properly.
S: Rebuilt critical portions of purifier. The system is
   back together. It will be checked tomorrow,3/30/89,
   before being released for use. 

   (Rosa, pls. see me tomorow early in the day.
     Thank you.)


. 
From bob Thu Mar 30 09:17:03 1989
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	id AA17167; Thu, 30 Mar 89 09:17:01 PST
From: bob (Robert M. Hamilton)
Message-Id: <8903301717.AA17167@argon>
To: phillip
Cc: hisn
Subject: lpe1
Date: Thu, 30 Mar 89 09:16:59 PST
Status: R

RE: Uniformity of profile in lpe's

Wei Hsin is going ahead and repeating some runs. When he is
done we may want to proceed with the shunts. We will need to
make sure we have some resistance wire (nichrome) in stock
of about the right resistivity. Wei Hsin will shoot back the
specified material from the manual. See me as I know where
such wire may be kept.

We may never be able to replicate the excellent profiles of
the distant past. The boat material originally used was pyrolitic
graphite which has some very special heat conduction
properties. It is anisotropic, conducting heat on one axis
50X better than on another. I have a feeling the last boat
was made of high purity graphite without this special
property.

bob

From bob Thu Mar 30 09:19:33 1989
Received: by argon (5.57/1.16)
	id AA17201; Thu, 30 Mar 89 09:19:31 PST
From: bob (Robert M. Hamilton)
Message-Id: <8903301719.AA17201@argon>
To: phillip
Cc: hsin, voros
Subject: lpe1
Date: Thu, 30 Mar 89 09:19:29 PST
Status: R

RE: Uniformity of profile in lpe's

Wei Hsin is going ahead and repeating some runs. When he is
done we may want to proceed with the shunts. We will need to
make sure we have some resistance wire (nichrome) in stock
of about the right resistivity. Wei Hsin will shoot back the
specified material from the manual. See me as I know where
such wire may be kept.

We may never be able to replicate the excellent profiles of
the distant past. The boat material originally used was pyrolitic
graphite which has some very special heat conduction
properties. It is anisotropic, conducting heat on one axis
50X better than on another. I have a feeling the last boat
was made of high purity graphite without this special
property.

bob


>>> 'lpe1' problem from phillip -- Fri Jun  2 06:58:15 1989 <<<

P: Glass gas inlet flange on tube broken.
S: (Temp.) Set input line to tube without
   benefit of the broken part. Reset idle
   parameters to system. lpe1 is up. 

>>> 'lpe1' problem from phillip -- Mon Jul 10 11:15:52 1989 <<<

lpe1 is (at least temporarily) retired.
The marshall furnace has been permanently moved to 
the lpe2 location.

Power and gas have been rendered OFF and marked appropriately.

We await the decision of Rosa Leong's advisor as to its further
fate.

>>> 'lpe1' problem from phillip -- Tue Aug  8 07:35:47 1989 <<<

H2 status:
#1=2.0 Kpsi  #2=2.1 Kpsi  #3=2.1 Kpsi
2 reserve cylinders

>>> 'lpe1' problem from phillip -- Thu Sep 28 09:11:15 1989 <<<

P: lpe1 disassembled.
S: Placed the system on line. Leak checked all H2 lines.
   The furnace and purifier will take at least 24 hours to stabilize.
   Temp. set to 750dF.

   Thus system is up.

>>> 'lpe1' problem from hsin -- Thu Sep 28 11:01:13 1989 <<<

I think Phil accidentally destroy the LPE system.  The LPE1
has not been used for a long time, and air gets into the tube.
Phil turned on the furnace and cover the tube all the way!
There is no N2 flowing and he turn on the H2.  Fornately the 
H2 has not been flowing. Otherwise there will be a huge explosion!!

The air remaining in the tube oxidize the graphite boat like burning
it in the flame sine furnace temp. is high.  I see water on the inside
of the cap of the LPE tube, this means H2 and O2 is combining and form
water.  Therefore, the LPE1 is totally dead now!  Fornately the H2 is
not flowing , otherwise the H2 and O2 under high temperature in the 
furnace will make a huge explosion!!!

I immediately remove the furnace away from the tube and shut off the H2.
I think we can turn off the power of the furnace also.  Since no one is
using the LPE1 system for the time been. 

The proper procedure for turn on the lpe system is first let the N2 flowing
to purge out the air in the tube. After the H2 purifier is hot, let H2 flow
into the tube to purge out the N2 . After H2 has flowing for some time, then
cover the furnace and start to bake.

I think Rosa should make sure everything is right if she want to use LPE1.
If she do not know the proper procedure and let Phil to do it, she should
be kick out of the LPE system!  Since Phil never grow LPE, therefore he is
not the one to blame.  If Rosa asked to bring up the LPE1 system, she should
be beside the LPE with Phil to make sure that the system been brought up
properly. 

I suggest to shut off the lpe1 system right now (both the tube and the furnace).Since this LPE1 system belong to Wang's group and Rosa did not inform me
that she will ask Phil to bring it up.  I think her group should pay for the 
repairment of the LPE1 system.  I am very un-happy about the present situation.

I request from now on no one should touch any of the LPE system (both lpe1 and
lpe2) without my premission.  

Wei Hsin

>>> 'lpe1' problem from bob -- Mon Oct  9 14:31:30 1989 <<<

lpe1 will be inspected tomorow at 10:30. If the boat appears to be in
good condition the system will be started up for work by Rosal. 

Rosa, please be on hand for the startup if you can. Send mail if
you can't.
Thanks,
Bob

>>> 'lpe1' problem from bob -- Tue Oct 10 11:28:38 1989 <<<

The boat on lpe1 was checked for oxidation and is in excellent condition,
no damage! lpe has been put on-line. The H2 purifier has been purged
and the tube has been N2 purged. lpe1 is ready for use.

>>> 'lpe1' problem from bob -- Fri Nov  3 14:01:51 1989 <<<

The H2 supply to lpe1 has been turned off and the purifier has
been purged with N2 and turned off. lpe1 is down until restart.

>>> 'lpe1' problem from bob -- Mon Nov  6 15:51:08 1989 <<<

The H2 purifier on lpe1 has been intitiated. It should be ready for
use in 1 hr.

>>> 'lpe1' problem from rosal -- Thu Nov 16 13:05:17 1989 <<<

I did a high temperature anneal (or bake out) to hopefully evaporate
impurities in lpe1.  I used teperature of 880C for 36 hours.  The 
boats were empty.  There was a good rate of hydrogen flow.
When I rolled the furnace away I noticed that the quartz tube had
turned green.  

The green color does not bother me (it is rather pretty), but it
indicates possible contamination.  I can use it as it is, since
I do not think it will affect my sample.  However, I should clean
it after I finish my runs, lest I provoke the wrath of higher
authorities in the lpe hierarchy.

The purpose of this "comment" is two fold.  First I want to make clear that 
I proceeded according to accepted practice, and did not do anything
out of the ordinary.  Secondly, since I have never cleaned a tube like
this, I want to ask how to do it.  I do not want any one to do it,
I just want information on how to do it.

Thanks,
respecfully,
rosa

>>> 'lpe1' problem from rosal -- Thu Nov 16 13:59:56 1989 <<<

this is a follow up on my previous comment.  Wei Hsin said that
there might be etching of the quartz, wich would weaken the tube,
and create a dangerous situation in case of rupture in a hydrogen
environment and high heat.  On the other hand, it might just be
contamination (some oxide of copper).

Would you please take a look at it?  I will not heat the tube
(I was going to melt some indium this evening-thursday) and hold
off until bob comes back to get the ok.  If it is not ok, then
a new tube will have to be ordered.  

I will be up at lbl tomorrow friday most of the day.  The phone 
number there is 486-4439.

Thanks,
rosa

>>> 'lpe1' problem from rosal -- Tue Nov 21 09:29:24 1989 <<<

I have entered this before, but gotten no reply.

I would like to know if it is safe to use the lpe by the wall
in the condition that is in (green powder on tube).  If it
is declared safe, I need to go ahead and use it, since I am
running out of alternatives for this proccesing step.

As I said before, I am willing to clean it, and I would
like some information on how to do it if this is available.

Thanks a lot,
rosa

>>> 'lpe1' problem from bob -- Tue Nov 21 10:57:30 1989 <<<

The green powder on lpe1 has been appearing since these machines were 
put online in 1968. It is Chromium Oxide and comes from the stainless
steel shell on the lpe furnace.

This reply was made earlier and the lpe1 problem deleted for our
equipment status board. It was likely glitched by me if it failed to
arrive.

lpe1 is up and useable.

>>> 'lpe1' problem from bob -- Mon Nov 27 15:25:58 1989 <<<

The H2 cylinders have been changed on the lpe furnaces.
There is currently 2200psi in the main regulator tanks and 2100 in the
reserve tank.
lpe1

>>> 'lpe1' problem from phillip -- Thu Dec 21 06:51:46 1989 <<<

1. Flow meter pulled off case.
2. Temp controller set to 1400dF. This WILL CAUSE A FIRE!!!!

>>> 'lpe1' problem from phillip -- Thu Dec 21 07:38:31 1989 <<<

The problem with the Matheson purifier is obviously
a thermocouple that has defected. This will be checked.

>>> 'lpe1' problem from phillip -- Mon Feb 26 11:15:25 1990 <<<

H2 gas status:
#1=2.0Kpsi   #2=2.1Kpsi   #3=1.8Kpsi
2 bottles in reserve.


>>> 'lpe1' fix from bob -- Fri Apr 27 15:41:32 1990 <<<

Gone!
