Before began the carbonization process, two cameras were setup in the hotlab for monitoring the evaporator and the power supply.  On duty ISAC Ops also helps to monitor on a regular basis and to grab the striptools + cameras (twice/shift) and put this information in the ISAC Logbook with subject header:  "UCx_2011_A 'date time'", for easy search.  

Wed May 25 14:39:31 2011:  UO2/C cast was dried in the fumehood over the weekend.  The cast was pilled off from the coated WD40 glass plate, rolled up and put in a target heating boat (/w TaC coating & sintered).   The boat was wrapped with 3 Ta-heat shields, then installed in the evaporator which is currently being pumped down.

Thu May 26 11:40:06 2011:  Vac @ 1.75e-6 torr, BP @ 0.032T.  TGHT stepped up to 30A/0.092V (panel @ 27A), ; TGHT has been held for over 10 mins, no change in vacuum yet.

Thu May 26 11:46:48 2011: TGHT @ 40A/0.123V (panel @ 37A), Vac 2.3e-6 Torr, BP@0.032T. 

Thu May 26 15:13:19 2011:  TGHT has been at 40A/0.123V for sometime.  Currently, Vac @ 4.39e-5 Torr, BP@ 0.27T.  (See Attachement#1)

Thu May 26 17:28:36 2011:  Auto ramping has begun.  (see attachment#2).  TGHT @ 40.60A, (panel @ 38A), vac @ 3.84 e-5 Torr.  

Wed Jun 1 13:28:58 2011:  TGHT currently at 395A/3.16V, vac @ 4.47e-5 Torr.  Heating sequence changed for the increment from 4.5e-5 Torr to 5.0e-5 Torr. 

Fri Jun 3 09:54:28 2011 :  The organics burnoff and the carbonization process are complete (see Attachment#3 for the striptool).  The cooling process will begin at a rate of 2A/min.  

Tue Jun 14 21:24:41 2011 :  The evaporator was about to be vented by argon on Jun 10 (Fri), but it was found that the argon cylinder was almost empty; a new one was replaced (see Attachment #4: Evaporator_Ar_flow).  After the argon cylinder was replaced,  the evaporator was purged with the gas and the vent valve was connected to the cylinder for venting of the evaporator.  The target oven was removed and stored in the hermetic transfer vessel, then transferred to the glove box.  (See attachment #5: UC2, Note: typo. Should read Ar gas, NOT N2).  The flakes were stored in the jar labelled "Stock# 2011_A", with total weight of 35g. 

Before began the carbonization process, two cameras were setup in the hotlab for monitoring the evaporator and the power supply.  On duty ISAC Ops also helps to monitor on a regular basis and to grab the striptools + cameras (twice/shift) and put this information in the ISAC Logbook with subject header:  "UCx_2011_B 'date time'", for easy search.  

P/S camera: http://isaccamera1, user/pw = admin

Evaporator camera: http://isac-cam01, user =admin, pw=yield 

Thu Jun 30 12:24:31 2011

UO2 used = 50.29g 

Green UO2/C = 71.96g, rolled up /w graphite sheet (15cm x 12cm), and put in the target boat, then wrapped with 3 Ta-heat shields.  The target is installed in the evaporator and is being pumped down.

Thu Jun 30 12:45:39 2011: Currently Vac @ 3.75e-5, CG2 @ 0.045T.

Friday, July 01, 2011, 13:28:  Vac @ 2.2-6 Torr.  TGHT set at 10A yesterday.   

Friday, July 01, 2011, 13:42:  TGHT stepped up to 36A (panel 33A), 0.134V.  No change in vacuum,  2.38e-6 Torr, CG @33mT. 

Friday, July 01, 2011, 13:51:  TGHT stepped up to 50A (panel 47A), 0.194V.  Vac @ 5.7e-6 Torr, CG2 @ 33mT.  

Friday, July 01, 2011, 14:09 :  Vac was rising slowly.  TGHT stepped up to 57A and the pressure started to increase faster.  TGHT was brought back down to 30A, and vac is coming down gradually.  (See attachment 1#2: Startup Vac/Current)

Friday, July 01, 2011, 14:16 :  Auto ramping began.  0.1/min, max currently @ 525A. (see attachement #3: Parameter)

Monday, July 04, 2011, 12:33:  TGTH @ 146.20A, Vac @ 4.74e-5 Torr.  (see attachment#4: 3-day trend).  Increase auto ramping rate to 0.5/min. 

Monday, July 04, 2011, 13:01:   TGHT @ 148A, Vac @ 5.20e-5 torr.  Auto rampiing paused until vacuum goes down to 5.0e-5 torr.  (see attachment#4)

Monday, July 04, 2011, 17:34:  TGHT @ 220A, VAC started to come down, indicating the burning off organics was done.  Increased heating rate to 1A/min. 

Friday, July 08, 2011, 21:30:  As per Peter Kunz, "I started the target cooldown sequence for IEVAP:TGHT1 at 20:35. The pressure came down to 4e-6 torr. The ramp down rate is 2A/min. Please check if the target heater current comes down to 0A. Then it can cool off over the weekend."

Monday, July 11, 2011, 12:17:  Evap glove box flashed with Ar gas, set pressure ~100psi.  Chamber also vented with Ar, set pressure  @ ~5psi.

 Monday, July 18, 2011, 15:53:  Target oven was coated with TaC and let dry over the weekend.  The target is now installed in the evaporator and currently being pumped down.  No Ta-heat shields are required for LP target ovens. 

Wednesday, July 20, 2011, 11:42:  Evaporator had to be vented to remove the target because Ta-heat shields were actually required for UCx target at 2uA p+.  Target heater was never turned on.   After removing the target oven, it was rolled around Ta wire; this prevent the Ta foil to stick on the oven.  Then 3 Ta-heat shields were wrapped around it, plus 2 shields on the back block.  The evaporator has been pumped down over night, currently vac @ 1.30e-6 Torr. 

Wednesday, July 20, 2011, 12:35: TGHT stepped up to 110A, pressure began to increase exponentially.   Brought THGT down to 100A. Will being auto cooling soon.

Wednesday, July 20, 2011, 12:48:  Auto heating beings.  2A/min, max current @ 520A.

Wednesday, July 20, 2011, 17:49:  TGHT reached to 520A.  Increased heater to 570A according to last year UCx procedures.

Wednesday, July 20, 2011, 19:46:  TGHT held at 570A for about 2 hours.  Cooling down has begun.  Set rate at 0.5A/min for slow cool down.  

Thursday, July 21, 2011, 12:20 :  TGHT cooling rate increased to 2A/min at about 10:25 am.  At 10:55am, TGHT p/s tripped off, and the water valve was closed.  Not sure what was the reason.  Rest p/s and water valve, and turned back the p/s and continue to cool down from 74A.  (see attachment#1: striptool)

Thursday, July 21, 2011, 14:45 :  TGHT off, chamber about to be vented into atmosphere.  

Wednesday, July 27, 2011, 12:58: 

Target length = 11.2cm

Total UC2/C foils = 245 discs

Total U/cm2 = 15.27g

Target has been pumped down over night,  Vac currently @ 1.64e-6 Torr.  BP @ 38mT.

TGHT @ 76A/0.27V.  Vacuum went up slowly to 4.8e-5 Torr.  TGHT brought back down to 68A, vacuum is holding at 4.8e-5 Torr. 

Wednesday, July 27, 2011, 14:43: Vac @ 2.3e-5 Torr.  Start auto-heating.  0.5A/min, TGHT max = 525A.

Sunday, July 31, 2011, 10:43:  TGHT has reached to 525A.  The pressure came down when the heater was stable at that current (see attachment: striptool_july 31); this implies that more power is needed to finish the carbonization process.  Peter Kunz was informed, and we decided to increase the target heater to 580A.  I will continue to monitor this from home. 

-----------------------------------

On Aug 01, Peter and I agreed to increase the TGHT to 600A (see attachment: striptool_july31_600A) .  Based on the heating curve with 3 Ta-heat shield @ 600A, the would give ~ 2050C/3700W (300C/1600W more than UCx#2).  By looking at the striptool, the pressure came down soon after.  More power might be needed to finish the carbonization process; however as per Peter the graphite vapour pressure increases above 2000C, and we don't know what will happen above that temperature.  So, we will keep it at 600A until the pressure comes down to low 10e-6 Torr.  Then I will being the auto cooling.  Anyway, we are running at 580A online.  On the safe side, 600A may be enough for the conditioning.   

-----------------------------------

 Tuesday, August 02, 2011, 11:19:  TGHT has reached to zero current (see attachment: UCx#2_conditioning).  The evaporator will be vented with Ar.

 Friday, August 05, 2011, 10:49

Unfortunately, after the evaporator was vented with Ar, the target was found be be broken into 3 segments. More details later...

Wednesday, August 03, 2011, 20:27 :  Target was wrapped with 3 new Ta-heat shields and 2 around the back block.  The tar from the previous UCx conditioning remained in the chamber was removed and cleaned.  Chamber is currently being pumped down, vac currently @ 8.3 e-6 Torr. 

Wednesday, August 03, 2011, 21:01:  Begin to step up TGHT, currently vac @ 7.5e-6 Torr.

Wednesday, August 03, 2011, 21:30 : TGHT stepped to 110A, vac raising exponentially. 

Wednesday, August 03, 2011, 21:34:  Brought down TGHT to 100A, and began auto heating.  Set rate @ 2A/min, max current to 520A. 

Thursday, August 04, 2011, 00:33:  THGT is ramping up nicely and the vacuum is coming down.  It should reach to 520at 01:30.  I asked ISAC Ops to cool down the target heater at 04:00.

Thursday, August 04, 2011, 10:26 :  TGHT has reached to 0A.  Chamber will be vented.  See attachment1 for striptool.

Thursday, August 04, 2011, 17:44:  All the UCx material from target oven 38634-3 was recovered and repacked in this new oven.  Total mass recovered = 45.911g and packed in 10.7cm length.  Target is currently being pumped down. 

Thursday, August 04, 2011, 20:23:  Current vac 5.6e-6 Torr.  Stepping up TGHT to 104A, vac increasing slowly.  Being auto heating @ 2A/min to 200A. 

Thursday, August 04, 2011, 21:32 THGT @ 200A,( see attachment1: 200A.jpg)

Friday, August 05, 2011, 09:04:  TGHT reached to 520A, and was cool down last night by ISAC Ops.  (See attachment2: re-conditioning).  Target looks good! 

 Monday, August 29, 2011, 13:16: Target oven was coated with TaC and let dry over night.  The target oven is in the evaporator and currently being pumped down.  

Monday, August 29, 2011, 15:12: Currently vac @ 8.41e-6 torr. 

Monday, August 29, 2011, 15:32: Stepped current up to 77A, started to see increase in pressure. 

Monday, August 29, 2011, 15:39:  Stepped current up to 110A.  Vac @ 1.32e-5 Torr.

Monday, August 29, 2011, 15:53: Vac went up to 3.8e-5 Torr @ 110A after 8 mins.  Brought TGHT back down to 100A, and began auto heating @ 2.0A/min to max current of 520A.

Tuesday, August 30, 2011, 08:39:  TGHT reached to 520A and was cool down by ISAC Ops at around 00:30.  See attachment#1 for striptool.  Evaporator will be vented. 

Tuesday, August 30, 2011, 09:29: Target Boat wrapped with 3 Ta heat shields. 6 D-End Caps and 6 End Caps coated with TaC. Pumping down - vac at 3.6e-5 torr.

Tuesday, August 30, 2011, 10:35: Stepped heater up to 100 A. Vacuum tripped heater. Stepped back up to 80 A then 70 A. Vac at 4.5e-5 torr.

Tuesday, August 30, 2011, 14:30: Manually increased heater to 580 A. Vac is 2.5e-5 torr. Local reading is 561 A for 570 A and 570 A for 580 A set points.

Tuesday, August 30, 2011, 15:57: Manually decreased heater in 12 min to 0 A from 460 A  vac starting at 6.3e-6 torr.

Anders Mjos wrote:

Tuesday, August 30, 2011, 09:29: Target Boat wrapped with 3 Ta heat shields. 6 D-End Caps and 6 End Caps coated with TaC. Pumping down - vac at 3.6e-5 torr. Tuesday, August 30, 2011, 10:35: Stepped heater up to 100 A. Vacuum tripped heater. Stepped back up to 80 A then 70 A. Vac at 4.5e-5 torr. Tuesday, August 30, 2011, 14:30: Manually increased heater to 580 A. Vac is 2.5e-5 torr. Local reading is 561 A for 570 A and 570 A for 580 A set points. Tuesday, August 30, 2011, 15:57: Manually decreased heater in 12 min to 0 A from 460 A  vac starting at 6.3e-6 torr.

 Vented evaporator. 

John Wong wrote:

Monday, August 29, 2011, 13:16: Target oven was coated with TaC and let dry over night.  The target oven is in the evaporator and currently being pumped down.   Monday, August 29, 2011, 15:12: Currently vac @ 8.41e-6 torr.  Monday, August 29, 2011, 15:32: Stepped current up to 77A, started to see increase in pressure.  Monday, August 29, 2011, 15:39:  Stepped current up to 110A.  Vac @ 1.32e-5 Torr. Monday, August 29, 2011, 15:53: Vac went up to 3.8e-5 Torr @ 110A after 8 mins.  Brought TGHT back down to 100A, and began auto heating @ 2.0A/min to max current of 520A. Tuesday, August 30, 2011, 08:39:  TGHT reached to 520A and was cool down by ISAC Ops at around 00:30.  See attachment#1 for striptool.  Evaporator will be vented.

 Tuesday, September 06, 2011, 17:04:  Re-conditioning sintered-TaC-coated target oven filled with sintered D-endcap.  No heat-shields.  Evaporator is currently pumping down:  CG2 = 51mT, IG1 = 2.65e-5 Torr.

TGHT auto-heating started by ISAC Ops as per JW at 18:45 yesterday when vacuum level at 6.6 e-6 Torr.  Then auto-cooling began at 05:30 this morning. BP @ 50mT - time to change backing pump oil. (see attachement1: overall striptool)

Wednesday, September 07, 2011, 11:16: Vented evaporator.  BP oil will be changed by Edi. 

Wednesday, September 07, 2011, 15:31

125 discs of TaC/C

Total discs mass = 125

Total length = 4.5mm

Total Mass = 30.41g

No Ta-heat shield. 

Left opening with D-TaC-sintered cap, and Right opening with regular TaC-sintered cap (orientation with the ionizer tube pointing out of the page).

Target is currently in the evaporator and being pumped down. 

Thursday, September 08, 2011, 09:13

Evaporator has been pumped down over night, IG1 currently at 1.74 e-6 Torr.   

Will begin TGHT, max @ 580A.

TGHT @ 50A, vac stable @ 1.7e-6 Torr.

Thursday, September 08, 2011, 10:18 

THGT @ 90A, pressure is increasing, currently at 4.7e-5 Torr and going up. 

 Thursday, September 08, 2011, 10:25

Auto-heating has begun. Set rate at 2A/min to max current 580A.

Incrementing if vac < 5.0 e-5 Torr, backing off if vac > 6.0 e-5 Torr. 

Friday, September 09, 2011, 07:58

TGHT auto cool down started @ 02:00, and at 0A.  IG currently @ 1.3e-6 Torr.  Venting chamber in progress.  Target will be removed from the evaporator afterward.

Target looks good :)  No signs of damage on the end cap or the target oven overall. 

See attachment 1 for the striptool. 

See attachment 2 and 3 for the target and endcaps after the sintering process.

Wednesday, September 21, 2011, 13:23

Target oven was wrapped with 3-Ta heatshields including the back block. 

Target is in the chamber and currently being pumped down.

Wednesday, September 21, 2011, 15:52  

IG @ 5.9e-6 Torr.  

TGHT stepped up to 85A, and pressure slowly rising. 

Started auto heating:  0.5A/min.  TGHT to max 580A.  

Thursday, September 22, 2011, 10:19 

Target was heated up to 580A, and held for 3 hrs. 

Currently IG @ 6.15e-6 Torr.

Auto-cooling started...

Thursday, September 22, 2011, 20:20 

Target oven was removed from the evaporator, and it was successfully sintered with TaC. 

Friday, September 23, 2011, 13:39 :

See attachment1: Archiver_TGHt0-580A.

 Thursday, September 22, 2011, 20:21

Target oven was wrapped with 3 Ta-heat shields and has been pumping down.

IG currently @ 3.2e-6 Torr, BP @ 25mT. 

TGHT stepped up to 85A, 

Began auto-heating: TGHT to max 580A @ 0.5A/min. 

Monday, September 26, 2011, 10:23 

TGHT reached to 580A on last Friday and was held at that current for 3hrs then followed by the auto-cooling.

Chamber was vented.

Target oven looks great.

 Thursday, November 03, 2011, 08:59

Target was previously coated/sintered with TaC & wrapped with 3 Ta-heat shields, including the back-block. 

Target was loaded with 365 UC2 discs + 3 samples for analysis. 

One regular endcap and one D-cap on the other end where the 3 samples sit. 

Evaporator has been pumped down since last night.  Currently vac @ 2.0e-6 Torr.  

For this final conditioning, here are the instructions: 

1.  Slowly stepping up TGHT  to 100A to burn off the organic binder.  Vacuum is expected to rise to the limit and stay at the plateau for a few days.  

2.  Once the vacuum has come down, the target will be cooldown and the chamber will be vented with Ar.  The cup-holder may be filled with the organic binder and needed to be clean.

3.  Pump back down the evaporator; step up TGHT to 100A and wait for the reaction. 

4.  Initial TGHT auto ramping.  Set TGHT to 520A @ rate of 0.1A/min.  

5.  Allow TGHT to held at 520A for 4 hours, then cool down. 

6.  Remove target from the chamber and store in the air-tight box and transferred to the Ar-glove box. 

Thursday, November 03, 2011, 09:13 

TGHT reached to 55A, and vacuum slowly to rise. Vac @ 5.7e-6 Torr. 

Wil stay at 55A for now... 

 Thursday, November 03, 2011, 09:51

A spike in vacuum and triggered the alarm handler but didn't tripped the TGHT.

Brought TGHT back down to 50A.

Initiated Auto-heating.  Set TGHT to 100A @ 0.1A/min. 

Thursday, November 03, 2011, 18:25  

I just found out that the target heater did not reach to 100A.  The auto-heating was running to bring up TGHT to 100, but the readback stayed at 50A.  Peter K. was contacted.  We stopped the auto-heating program and instantly the target heating jumped to 100A.  Quickly, we brought down the heater to 50A.  (see attachment1 for the stiptool).  Not sure what was happening.  

I stepped up the TGHT manually to 61A, and the pressure is slowing increasing.  

Thursday, November 03, 2011, 19:26  

Something is wrong with the TGHT power supply.  I stepped it up from 55 to 63A, and found the readback stuck at 58 (local @ 56).  So, I tapped the TGHT down to 58A and then the readback followed the setpoint.

I tried again to bring it up to 63 and it stuck at 60A, and tapping down and up the slider triggered the readback to follow the setpoint.  This is a fault in the system. 

Peter was informed, and is taking over this for now.  We need to bring up the THGT up to 100A to burn off the organic binder.  I don't know what we should do from here.  I need a break! 

Friday, November 04, 2011, 15:46  

As per Jane,  there is a problem with the network issue that controls the target heater power supply.  The power supply current is not regulating proper.  (see attachment #2)

TGHT was ramped down from 85A to 0A for Control to work on the problem since this morning.  

See e-fault#5672, WP#2011-11-04-5. 

 Monday, November 07, 2011, 11:12

 Control has fixed the network issue.  

Stepped up to 10A, local read 8A.

 Initiated autoramping, setp TGHT to 20A at 1A/min.  TGHT did reach to 20A with no problem.  

Stepped up further to 30A, local at 28A.  

I conclude that the power supply is now regulating properly.  

Conditioning of UCx#3 continues... 

 Monday, November 07, 2011, 12:14

TGHT at 84.5A, locat @ 82A.  Vacuum hovering at 7.2e-5 Torr.  

Initiated auto-ramping: TGHT set to 100A, at 0.1A/min.  Incrementing current if vac < 5.0e-5 Torr and backing off if vac >6.0e-5 Torr. 

Monday, November 14, 2011, 11:03 

TGHT reached to 175A on Nov 11, 2011 to finish off the organics burnout process. 

Then TGHT was cool down @ 2A/min until TGHT reached to zero.

Evaporator was vented with Ar and the chamber was open.

The target was removed from the evaporator; the organic binder was condensed out from the D-endcap and some from the ionizer tube (See attachment 3 & 4).

One of the samples was retrieved for analysis, and the D-endcap was put back.

The target was installed back, and the chamber was pumped down. 

The sintering and thermal reduction processes continued with TGHT ramped up to 520A.  Heating rate @ 0.1/min. 

Target has been heated at 520A for ~5hrs, vac @ 5.35e-6 Torr. (see attachment 5). 

Wednesday, November 16, 2011, 13:42

 Target looks good.  It has been installed in the heatshield, and it's being stored in the Ar-golve box. 

Evaporator is now off.  

Evaporator was cleaned Nov 11 from after target was conditioned up to 175A. There was significant condensation of oily fluid on the left side where the target container was open (D-shaped end cap). There were also deposits in the hole for the ionizer, but the ionizer itself seemed to be clean.

Tuesday, July 10, 2012, 12:44

Target contains 230 discs of UCx (material from UC2 flakes, batch#01-04062012). 

Total UCx mass (UC2 + C-grv extra + C-foil + Org.) = 38.564g

Total length = 8.0 cm

Target was previously contained with TaC and sintered;  it's wrapped with 3 layers of Ta-heat shield, including the back-block.

A regular TaC-coated endcap is inserted on one end and the other is inserted with a D-cap with two samples  (Marked sample #1 & #2).

The chamber is currently being pumped down.

 Tuesday, July 10, 2012, 19:06

IG currently at 9.1e-6 Torr, BP @ 22mTorr.  

Set TGHT auto-ramping parameters:  

Vacuum limit 5.0 e-6 Torr, (max 6.0 e-6 Torr)

rate = 0.25A/min

TGHT = 55A  

Initiated auto-ramping...

 Tuesday, July 10, 2012, 23:20

TGHT reached to 55A and stayed for about 55min.  The pressure was at 2.5e-5 Torr.

Increases TGHT auto-ramping to 175A to allow burning off most of the organic binder, and the chamber will be vented and cleaned before ramping 

up the heater to 520A.

Ramping rate set to 0.1A/min.

Monday, July 16, 2012, 09:44 

TGHT reached to 175A.  It has taken almost 6 days to burn off the organic binder. (see attachment #1).  

Auto-cool down has initiated.  The chamber will be vented with Ar gas and it will be opened for cleaning of the burn-off binder. 

 Monday, July 16, 2012, 14:20

The chamber was vented with Ar, and the target was removed for cleaning.  There was quite a bit of organic gunge filled the ionizer holder-base plate and condensation out the D-cap (as usual).

The chamber was cleaned and the target was installed back.  It's currently being pumped down.

Once the vacuum reached to 10e- Torr.  The heater will be ramped up to max 520A to finish the sintering process.

 Monday, July 16, 2012, 17:01

Pressure has reached to 9.1e-6 Torr. 

Initiated auto-heating at 1A/min.  Set TGHT = 175A.

 Monday, July 16, 2012, 20:00

TGHt reached to 175A.  Pressure stable at 2.2e-5 Torr.  

Increase target heater to 520A; autoramping at 0.1A/min. 

 Thursday, July 19, 2012, 10:27

TGHT reached to 520A, 5.47V (local 516A, 5.36V) and has stayed for about 4 hours.  IG1 = 9.58e-6 Torr and coming down.  BP=29mTorr.

Thursday, July 19, 2012, 10:29

Auto-cooling down in process...  2A/min for TGHT --> 0A.

 Thursday, July 19, 2012, 16:52

The chamber was vented with Ar gas, and the target was transported to the Ar-glove box. 

The samples were removed from the target.

A new TaC-sintered end-cap was inserted.

The target looks good!

Total time for the conditioning process = 9 days.

See attachment#2 for the overall heating/pressure curves.

Friday, August 24, 2012, 16:40

Target is loaded with 245 discs of UCx (material from batch#02-13062012),

Tot length = 9.1 cm. 

The container is wrapped with 3 layers of Ta-heat shield, including the back block. 

A regular TaC-coated endcap is inserted on one end and the other is inserted with a D-cap

The chamber is currently begin pumped down.

 Instructions (while I'm on vacation)

1.  TGHT will need to heat up to ~175A to burn off the organics. 

      Parameter setup:  5.0e-5 good vac, 6.0-5 bad vac.  The auto-ramping rate is set to 0.1A/min.

2.  Once the organics have burnt off, ramp down the TGHT to 0A at 2A/min.

3.  Purge the glovebox with argon gas for at least 5 mins. 

4.  Vent the chamber with Ar gas.  Close the valve when it is completely vented.

5.  Remove the target.  Be careful the left end (view from the top) is open with the D-cap. 

6.  Clean the chamber with TCE and remove all the gunge.

7.  Install the target back

8.  Pump down the chamber to at least low 10e-6 Torr before begin the final carbonization process.

9.  Auto-ramp the TGHT current to 175A at 1A/min.

10.  Once the TGHT reach to 175A.  Auto-ramp TGHT to 520A at 0.1A/min.

11.  At 520A, keep heating the target for at least 4-5 hours.

12.  Auto ramp TGHT to 0A at 2A/min.

13.  Purge the glovebox with argon for at least 5 min

14.  Vent the chamber with argon gas.  Close the vavle when it is completely vented.

15.  Remove the target from the chamber and put in the "orange box" and transport to the Ar-glove box.

Done!

 Monday, August 27, 2012, 11:26

The chamber has been pumped down over the weekend.  Vac is currently at 3.45e-6 Torr. 

Auto-ramping TGHT to 55A at 0.25A/min.

 Monday, August 27, 2012, 16:24

TGHT reached to 55A and stayed for about 2 hours.  Vacuum went up to 1.9e-5 Torr and it's slowly coming down. 

Increase auto ramping to 175A at 0.1A/min.