 Monday, February 18, 2013, 16:43, John Wong, Empty, , LP-SIS, Done, Sintering TaC coating on the RFQ target container 
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Monday, February 18, 2013, 16:28
The RFQ target container is coated with TaC and ready to be sintered. No Ta-heat shields are used. This container will be used for the SiC#28-LPSIS-RFQ.
Two thermocouples are welded on the container: One on the end cap and the other on the back block (see attachment#1)
The target will be heated to at least TGHT at 580A and TBHT at 300A; the vacuum and gasses will be monitored.
The chamber is currently being pumped down...
Friday, February 22, 2013, 14:24
The gasses were analyzed with the RGA:
TGHT @ 520A, TBHT @ 300A: Mass 28 (CO) reached to max current of ~5pA before the current started to decrease, (see attachment #2). This could be the indication of the material(s) in the target container was "sort of" fully reduced.
TGHT was further ramped up to 600A and heated for a few hours. The temperature on the end was measured at 1252C and the center block was at 1580C. (see attachment #3).
The container was successfully sintered with TaC.
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Friday, February 22, 2013, 15:55, John Wong, SiC, , LP-SIS, Done, Sintering SiC#28-RFQ
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Friday, February 22, 2013, 15:49
The LP-SIS RFQ target container was previously coated with TaC and sintered up to ~1500C (TGHT @ 600A, TBHT @ 300A).
The container is loaded with 325 discs of SiC, a total of 10.9cm in length.
For this process,
TGHT will be ramped up to 600A and at the same time TBHT will go up to 300A. No Ta-heat shield is used.
The ramping rate is set to 0.2A/min.
The chamber is currently being pumped down.
Friday, March 01, 2013, 15:57
The target was further heated up to 650A TGHT and 300A TBHT for 4 hours yesterday; then it was cooled down.
Some reactions on the target end (where the D-cap inserted) was observed.
Yellow crystals on the D-cap was formed, just as we have seen before.
Overall, the target looks good!
See attachment#2 for the target production.
More about the gasses analyst from the RGA later...
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Monday, March 04, 2013, 17:41, John Wong, Empty, LP-SIS RFQ ver 2.0, , , Testing LPSIS RFQ ver 2.0
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Monday, March 04, 2013, 17:39
This is the 2nd modified target container for RFQ LPSIS. The container will be heated up to 650A TGHT and 150A on TBHT. No Ta-heat shield is being used.
Heating rate at 1A/min for both TGHT & TBHT. Once the target is at the currents, TBHT will be further ramped up to 300A.
Temperatures are being measured by two thermocouples (one on RFQ component and the other on the Cu heat-shield).
Gases are being analyzed using the RGA.
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 Wednesday, March 06, 2013, 17:53, John Wong, Empty, 38481-4, HP-FEBIAD, Done, CTL thermal test
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| Anders Mjos wrote: |
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Wednesday, March 06, 2013
The Cool Transfer Line (CTL) test target is installed for thermal tests. Drawing number is ITD0431 REV A.
Thermocouple channels are as follows:
T1: Cu block on CTL
T2: Heat Shield above CTL
T3: Heat Shield cooling water Supply
T4: Heat Shield cooling water Return
Cooling water is in Evap2 supplied to the cooling line that goes directly to the area on the Heat Shield above the CTL.
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Wednesday, March 06, 2013, 17:23
The target has been pumping down to 5.3 e-7 Torr. On the RGA mass scan, mainly H2O (mass 18 + constituents) was detected at ~2.7pA (see attachment #1).
The target will be heated up: TGHT = 850A (rate @ 1A/min); TBHT = 300A (rate @ 1A/min).
Thursday, March 07, 2013, 11:51
TGHT and TBHT reached to 850A (local, 845A\13.80V) and 300A, respectively. The out gassing of CO (mass 28) reached to ~5pA at the max currents. (see attachment #2)
TBHT will be ramped down to 0A to compare the temperatures.
Thursday, March 07, 2013, 15:55
TBHT at 0A. See attachment#3 for the temperatures and RGA data before further ramping down the TGHT.
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Monday, March 11, 2013, 15:59, John Wong, Empty, 38481-4, HP-FEBIAD, Done, CTL thermal test 2
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| Anders Mjos wrote: |
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| Anders Mjos wrote: |
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Wednesday, March 06, 2013
The Cool Transfer Line (CTL) test target is installed for thermal tests. Drawing number is ITD0431 REV A.
Thermocouple channels are as follows:
T1: Cu block on CTL
T2: Heat Shield above CTL
T3: Heat Shield cooling water Supply
T4: Heat Shield cooling water Return
Cooling water is in Evap2 supplied to the cooling line that goes directly to the area on the Heat Shield above the CTL.
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Monday, March 11, 2013
The CTL test target was installed again for a second thermal test. CTL block fastened to HS with 1 in lbs. A small piece of Ta-foil of 0.001" thickness was used between the CTL Cu-block and the Ta transfer line to reduce the heat transfer..
Thermocouples were re-attached to CTL and Heat Shield (see above for channels #s).
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Monday, March 11, 2013, 15:55
Chamber was pumped down to 2 e-7 Torr. HS water valve opened and no leaks were detected.
TGHT and TBHT are ramping up to 850A and 300A at 2A/min, respectively.
RGA is running...
Tuesday, March 12, 2013, 10:44
TGHT/TBHT reached to max currents.
See attachment #1 for temperature and RGA measurements.
Cooling down in process... 5A/min.
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Thursday, April 11, 2013, 14:20, John Wong, Empty, 39165-6, LP-SIS, Done, Coating target oven /w TaC & sintering for UCx#6
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Monday, April 08, 2013, 17:39
Target container is coated with TaC; the container will be used for the UCx#6 target.
No Ta-heat shields are used.
For the sintering process:
TGHT will be ramped up to 580A at 0.2A/min
TBHT will be ramped up to 230A at 0.2A/min
Chamber has been pumped down. HS cooling H2O valve opened; no leaks have detected.
Thursday, April 11, 2013, 14:35
Target and tube heaters have reached to optimum.
Auto-cooling initiated...
Friday, April 12, 2013, 11:17
P/S off. Chamber vented.
Done!
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Monday, April 22, 2013, 18:49, John Wong, Empty, 38481-4, HP-FEBIAD, Done, CTL test
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| Anders Mjos wrote: |
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Target installed with 4 T/C
The target assembly is ITD0300 with the CTL Cu cooling block slightly modified.
Ch1 - CTL cooling block T/C feedtrough
Ch2 - Heat shield below left gripper arm - T/C feedthrough
Ch3 - Heat shield below left gripper arm - 9 pin connector
Ch4 - Target left side leg on tube - 9 pin connector
Friday, April 19, 2013, 15:23: Roughing
Friday, April 19, 2013, 15:41: Started turbo
Monday, April 22, 2013, 09:43: Opened water supply. Vacuum stable at 2.8E-7 T (IGP1)
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Monday, April 22, 2013, 18:48
Ramping TGHT/TBHT to 850A/300A at 1A/min.
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Tuesday, May 14, 2013, 17:15, John Wong, Empty, 38481-6, HP-FEBIAD, Done, SinteringTaC coating
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Tuesday, May 14, 2013, 17:04
Target oven is coated with TaC, and wrapped with 3-Ta heat shields.
TGHT and TBHT will be ramped up to 820A and 300A, respectively.
Ramping rate set to 1A/min.
Good Vac at 3.e-5 Torr, Bad Vac @ 4.0e-5 Torr.
Chamber is currently being pumped...
Wednesday, May 15, 2013, 10:56
Chamber has pumped down to 4.5e-7 Torr.
HS cooling water valves opened; no leaks were detected.
Stepping up TGHT/TBHT to 80A; monitoring vacuum.
Wednesday, May 15, 2013, 11:26
Pressure is increasing. TGHT setpoint @ 80A, readback @ 88.6A/0.603V, local @ 83A/0.80V.
Wednesday, May 15, 2013, 12:08
TGHT/TBHT stepped up to 140A and tripped off at high limit vacuum.
Restarted p/s and set TBHT/TGHT at 100A
Initiated auto ramping...
Friday, May 17, 2013, 11:39
TGHT and TBHT reached to 820A and 300A, respectively. Target has been heating at the max currents for ~12hrs.
Vacuum is coming down to 4.3e-7 Torr.
The TaC coating sintering is completed.
Autocooling is initiated. TGHT ramping rate @ 2A/min, and 1A/min for TBHT.
Wednesday, May 22, 2013, 10:43
Sintering complete.
Chamber will be vented
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Tuesday, May 28, 2013, 17:50, John Wong, , Target Boat #2 , , Done, Sintering TaC coated end caps
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Tuesday, May 28, 2013, 17:36
The target containers endcaps were coated with TaC solution and let dry.
Each cap is wrapped with a small piece of graphite foil and inserted in the target boat.
The chamber is currently being pumped down.
The HS cooling water valve will be opened tomorrow; any leak will be inspected.
When the vacuum is good, TGHT will be ramped up to 580A.
Wednesday, May 29, 2013, 17:06
HS water valve was opened early this morning; no leaks were detected.
TGHT has stepped up to 50A. IG is currently at 2.0e-6Torr.
Initiated auto-ramping at 1.0A/min.
Thursday, May 30, 2013, 11:12
TGHT reached to 580. The end caps have been heated at that current for more than 7 hrs.
IG is coming down, currently at 8e-7 Torr.
Auto-cooling initiated, ramping down at 2A/min .
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Tuesday, June 18, 2013, 16:40, John Wong, SiC, 38481-6, HP-FEBIAD, Done, Sintering of SiC #29
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| Laura Lambert wrote: |
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Monday, June 17, 2013, 16:57
Target is loaded with 510 SiC discs
Container was previously coated with TaC and sintered
SiC is wrapped with tantalum heat shield
Chamber is currently being pumped down
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Tuesday, June 18, 2013, 16:16
HS water valves opened; no leaks were detected.
IG @ 8.9e-7 Torr.
Note: This target has a regular end cap inserted on one end, and the other with a D-cap.
TGHT will be heated up to 820A and TBHT to 300A; ramping rate at 1A/min.
Stepped up TGHT/TBHT to 60A. Vacuum slowly increasing...
Tuesday, June 18, 2013, 17:55
Stepped up TGHT/TBTH to 80A. 10 mins later, pressure went beyond the limit and tripped of the p/s. F! 
Allowed vacuum to come down below 8e-5 Torr. Stepped down TGHT/TBHT to 50A.
Currently IG @ 4.8-5 Torr.
Initiated auto-ramping: setting: Good Vac = 3e-5 Torr, Bad Vac = 4.0e-5 Torr.
Thursday, June 20, 2013, 06:21
About 10 min ago, Evap tripped off due to high vacuum.
Vacuum came back down below the trip limit and both TGHT/TBHT p/s were stepped down to 40A and turned back on.
Changed auto ramping rate to 05A/120min.
The process continues... (And I'm going back to sleep!)
Friday, June 21, 2013, 15:19
Vacuum is close to the trip limit.
Change the ramping rate to 0.2A/120min.
Monday, June 24, 2013, 17:04
Organic burnt out is complete and vacuum has come down to ~9.0e-6 Torr.
Increase ramping rate to 0.2A/60min - The sintering process should take about another 2 days if everything goes smoothly.
Wednesday, June 26, 2013, 17:29
TGHT & TBHT have reached to 820A and 300A, respectively, for 4 hours.
Vacuum is at 9e-7 Torr.
Cooling down is in progress, at a rate of 1.0A/min for TGHT and 0.5A/min for TBHT.
The target will be ready to come out by tomorrow.
Thursday, June 27, 2013, 11:02
TGHT/TBHT reached to 0A. Vacuum is leveled at 1.2e-7 Torr.
Chamber will be vented in air soon.
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Monday, July 22, 2013, 15:03, John Wong, Empty, 38634-7, LP-SIS, Done, Sintering empty target oven coated with TaC for UCx#7
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Monday, July 22, 2013, 15:00
Target container is coated with TaC - this container will be used for UCx#7.
Container is wrapped with 3 layers of Ta, including the back-block.
For the sintering process:
TGHT will be ramped up to 580A at 0.2A/min
TBHT will be ramped up to 230A at 0.2A/min.
Chamber has been pumped down. HS cooling H2O valves are opened, and no leaks are detected.
Currently IGP1 @ 7.03e-6 Torr.
Monday, July 22, 2013, 15:19
TGHT/TBHT was stepped up to 20A. Pressure increased to ~1.2e-5 Torr.
Auto-ramping initiated...
Wednesday, July 24, 2013, 18:40
TGHT and TBHT have reached to 580A/230A, respectively. Target has been heated for ~4 hours at that max current.
Vacuum currently at 1.65e-6 Torr.
Auto-cooling initiated... (TGHT @ -1A/min, TBHT -0.5A/min)
Target will be vented in air tomorrow.
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Thursday, August 08, 2013, 17:28, John Wong, NiO, 39530-6, HP-FEBIAD, Done, Sintering NiO # 2
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| Laura Lambert wrote: |
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Thursday, August 08, 2013, 15:19
NiO target materials loaded into the container yesterday.
Total discs = 530, (5 discs/pack)
length [after loaded] = 9.0cm
Target container is wrapped with Ta-heat shields, and will be removed after sintering process.
No end caps were inserted.
The chamber has been pumped down and currently IG1 = 3.8x10-06 Torr.
The HS cooling water was turned on and no leaks were detected.
TGHT and TBHT have been stepped up to 50A.
Auto-ramping setting:
0.2A/min for TGHT max = 250A, TBHT max = 230A.
Good vacuum = 3.00e-05 Torr
Bad vacuum = 4.00e-05 Torr 
**See attachment #1 for pictures of target pre-sintering
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Thursday, August 08, 2013, 17:26
Pressure is stabilizing at ~2.2e-5 Torr. TGHT/TBHT at 50A.
Initiated auto-ramping...
Sunday, August 11, 2013, 21:30
TGHT/TBHT have reached to 250A/230A. Target have been heated over the weekend.
Cooling down initiated; 2A/min.
The chamber wil be vented in air tomorrow.
Monday, August 12, 2013, 18:01
The sinterring process is complete.
The target is ready to be removed from the evaporator, and the endcaps will be inserted.
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Wednesday, August 21, 2013, 12:30, John Wong, Ta, 38817-10, HP-SIS, Done, Conditioning Ta target
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Wednesday, August 21, 2013, 12:28
Container is filled with 400 discs of Ta foils, and wrapped with 3 layers of Ta heat shields.
No caps are inserted during the conditioning.
Chamber is currently being pumped down.
Wednesday, August 21, 2013, 15:54
HS cooling water valves opened, no leaks were detected.
IG @ 2.9e-6 Torr.
Heating setting:
TGHT max = 820A,
TBHT max = 230A
ramping rate 2A/min.
Thursday, August 22, 2013, 12:45
TGHT/TBHT reached to 820A/230A, respectively.
So much out-gassing was observed at the max currents. (see attachment#1).
TGHT/TBHT are ramping down at 4A/min.
Chamber will be vented in air.
The target will will be inspected.
More info later...
Thursday, August 22, 2013, 16:44
Target was removed from the evaporator and inspected.
The container and the Ta materials look OK.
The outgassing could be from the Ta-heat shields; they look burnt and brittle.
Overall, the target is good.
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Tuesday, August 27, 2013, 17:01, John Wong, , targetboat (TaC coated), , Done, Sintering TaC coated regular caps
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Tuesday, August 27, 2013, 16:48
Target boat is filled with TaC coated endcaps (brown) and some partial sinterred ones (gray) from before. (see attachment#1).
The container is wrapped with Ta heat-shield.
Chamber has been pumped down; IG currently @ 7.3e-7 Torr.
Heat-shield cooling water valves are open; no leaks are detected.
Initiated TGHT auto-ramping at 0.5A/min, set TGHT max at 580A.
Wednesday, August 28, 2013, 16:09
TGHT has reached to 580A and been heated for over 4 hours.
IG is coming down, currently at 1.9 e-6 Torr.
Initiated auto-cooling. 2A/min.
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Tuesday, September 17, 2013, 11:21, John Wong, Nb, target boat #3 (brand new!) , , , Nb thermo treatment (Bob's samples)
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Tuesday, September 17, 2013, 11:14
Target boat contains 5 Nb discs. 3 discs are wraps with 0.001" thin of Nb foil (99.8% pure), and 2 are wraps with 0.001" Ta foil (see attachment#1)
Chamber has been pumped down over night. Pressure is currently at 9.8e-7 Torr.
Heating instructions:
Samples will be heated up to 800C. TGHT will be ramped up accordingly. (Two thermocouples are wielded on the target container.)
Once at the desired temperature; the samples will be heat for 4 hours before cooling down.
Tuesday, September 17, 2013, 14:37
Target temperature has reached to 800C at around 13:00 (see attachment#2)
TGHT @ 230A/3.07V (local 233A/3.25V).
IG @ 1.06e-6 Torr.
The heater will be ramped down at ~17:00 at 2A/min.
Tuesday, September 17, 2013, 17:36
Target temp: T1 = 805C, T2=797.6C
IG @ 9.4e-7 Torr.
Cooling down initiated.
Wednesday, September 18, 2013, 11:34
TGHT at 0A. Temp at 22C.
IG @ 5.8e-7 Torr.
Venting chamber.
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Thursday, September 19, 2013, 17:02, John Wong, Nb, target boat #3 (brand new!) , , , Nb thermo treatment (Bob's samples)
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| Laura Lambert wrote: |
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| John Wong wrote: |
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Tuesday, September 17, 2013, 11:14
Target boat contains 5 Nb discs. 3 discs are wraps with 0.001" thin of Nb foil (99.8% pure), and 2 are wraps with 0.001" Ta foil (see attachment#1)
Chamber has been pumped down over night. Pressure is currently at 9.8e-7 Torr.
Heating instructions:
Samples will be heated up to 800C. TGHT will be ramped up accordingly. (Two thermocouples are wielded on the target container.)
Once at the desired temperature; the samples will be heat for 4 hours before cooling down.
Tuesday, September 17, 2013, 14:37
Target temperature has reached to 800C at around 13:00 (see attachment#2)
TGHT @ 230A/3.07V (local 233A/3.25V).
IG @ 1.06e-6 Torr.
The heater will be ramped down at ~17:00 at 2A/min.
Tuesday, September 17, 2013, 17:36
Target temp: T1 = 805C, T2=797.6C
IG @ 9.4e-7 Torr.
Cooling down initiated.
Wednesday, September 18, 2013, 11:34
TGHT at 0A. Temp at 22C.
IG @ 5.8e-7 Torr.
Venting chamber.
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Thursday, September 19, 2013, 11:41
Target boat contains batch#2 Nb samples (see attachment #1)
Chamber has been pumped down over night.
IG @ 5.5e-07 Torr.
CG1B @ 0.033 T
CG1A @ 0.127 T
There is a leak in the backing line. BV1 was bypassed in order to turn on the turbo pump. (Will investigate the leaks after the processes are done)
*See attached picture to view samples
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Thursday, September 19, 2013, 17:01
TGHT reached to 800A. Temp at 795.9C for 4 hours. Vac at 5.8e-7 Torr.
Cooling down initiated. ramping rate at 2A/min.
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Friday, September 20, 2013, 14:59, John Wong, Nb, target boat #3 (brand new!) , , , Nb thermo treatment (Bob's samples)
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| John Wong wrote: |
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Tuesday, September 17, 2013, 11:14
Target boat contains 5 Nb discs. 3 discs are wraps with 0.001" thin of Nb foil (99.8% pure), and 2 are wraps with 0.001" Ta foil (see attachment#1)
Chamber has been pumped down over night. Pressure is currently at 9.8e-7 Torr.
Heating instructions:
Samples will be heated up to 800C. TGHT will be ramped up accordingly. (Two thermocouples are wielded on the target container.)
Once at the desired temperature; the samples will be heat for 4 hours before cooling down.
Tuesday, September 17, 2013, 14:37
Target temperature has reached to 800C at around 13:00 (see attachment#2)
TGHT @ 230A/3.07V (local 233A/3.25V).
IG @ 1.06e-6 Torr.
The heater will be ramped down at ~17:00 at 2A/min.
Tuesday, September 17, 2013, 17:36
Target temp: T1 = 805C, T2=797.6C
IG @ 9.4e-7 Torr.
Cooling down initiated.
Wednesday, September 18, 2013, 11:34
TGHT at 0A. Temp at 22C.
IG @ 5.8e-7 Torr.
Venting chamber.
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Friday, September 20, 2013, 14:56
Target contains batch#3 sample wrapped with Nb foil.
Chamber has been pumped down to 1.03e-6 Torr.
Samples will be heated up to 1200C for 4 hours.
Friday, September 20, 2013, 16:54
TGHT at 450A, temp stabilizes at 1238C.
Will cool down at 20:30 tonight.
Friday, September 20, 2013, 20:40
Samples has been heated for 4 hours at 1235C.
Cooling down initiated.
Monday, September 23, 2013, 14:40
Chamber was vented.
Batch#3 process completed.
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Monday, September 23, 2013, 16:18, John Wong, Nb, target boat #3 (brand new!) , , , Nb thermo treatment (Bob's samples)
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| John Wong wrote: |
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| John Wong wrote: |
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Tuesday, September 17, 2013, 11:14
Target boat contains 5 Nb discs. 3 discs are wraps with 0.001" thin of Nb foil (99.8% pure), and 2 are wraps with 0.001" Ta foil (see attachment#1)
Chamber has been pumped down over night. Pressure is currently at 9.8e-7 Torr.
Heating instructions:
Samples will be heated up to 800C. TGHT will be ramped up accordingly. (Two thermocouples are wielded on the target container.)
Once at the desired temperature; the samples will be heat for 4 hours before cooling down.
Tuesday, September 17, 2013, 14:37
Target temperature has reached to 800C at around 13:00 (see attachment#2)
TGHT @ 230A/3.07V (local 233A/3.25V).
IG @ 1.06e-6 Torr.
The heater will be ramped down at ~17:00 at 2A/min.
Tuesday, September 17, 2013, 17:36
Target temp: T1 = 805C, T2=797.6C
IG @ 9.4e-7 Torr.
Cooling down initiated.
Wednesday, September 18, 2013, 11:34
TGHT at 0A. Temp at 22C.
IG @ 5.8e-7 Torr.
Venting chamber.
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Friday, September 20, 2013, 14:56
Target contains batch#3 sample wrapped with Nb foil.
Chamber has been pumped down to 1.03e-6 Torr.
Samples will be heated up to 1200C for 4 hours.
Friday, September 20, 2013, 16:54
TGHT at 450A, temp stabilizes at 1238C.
Will cool down at 20:30 tonight.
Friday, September 20, 2013, 20:40
Samples has been heated for 4 hours at 1235C.
Cooling down initiated.
Monday, September 23, 2013, 14:40
Chamber was vented.
Batch#3 process completed.
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Monday, September 23, 2013, 16:14
Batch#4. Target container contains 2 Nb stables (a bullet type and a disc).
Samples are wrapped with "dimpled" Nb foil to prevent diffusion bonding.
Chamber has been pumped down to 8.3e-7 Torr, CG1B @ 30mT, CG1A @ 118mT.
Samples will be heated up to 1400C for 4 hours.
Monday, September 23, 2013, 17:46
TGHT at 620A. Temp at 1400C. Current pressure @ 2.5e-6 Torr.
Tuesday, September 24, 2013, 16:45
Sample#4 was heated up to 1400C and after about 3hrs, the target container started to break.
See the link below for more details:
https://www.dropbox.com/s/9mhpkz66u6yqldm/Nb_1400C.mp4
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Thursday, September 26, 2013, 15:17, John Wong, Empty, 39814-VI-?, LP-IG-LIS, Done, Sintering empty target oven coated with TaC for UCx#8
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Thursday, September 26, 2013, 13:04
The LP-IG-LIS target container is coated with TaC.
Container is wrapped with 3 layers of Ta heat shield and about to go through the sintering process.
A thermocouple is inserted to measure the temperature inside the tube (1st attempt ever).
Click on the link for detailed pictures:
https://www.dropbox.com/sh/6dc5arajg87mws9/6cU5OxjkZg
TGHT will be ramped up to 580A at 0.2A/min
TBHT will be ramped up to 230A at 0.2A/min.
Chamber has been pumped down. HS cooling H2O valves are opened, and no leaks are detected.
Currently IGP1 @ 5.9e-6 Torr.
Thursday, September 26, 2013, 15:44
TGHT stepped up to 30A. TBHT currently @ 0A.
Temp @ 35C, Vac @ 1.4e-5 Torr.
Monday, September 30, 2013, 14:54
The container was heated up to 580A TGHT/ 230A TBHT for a day (see attachment #1 for vac vs cur plot).
The temperature was measure at ~1780C. (see link for details: https://www.dropbox.com/sh/d8d9j2t60qlm3jk/nkMh7dx_R8 )
The target was cooled down and vented.
Proceed complete.
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Friday, October 04, 2013, 16:21, John Wong, Empty, , LP-SIS, Done, Sintering TaC coating on a LP target container to be used for C-grv tube test
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Friday, October 04, 2013, 15:37
A LP target container is coated with TaC. The container is wrapped with 3 layers to heat shield.
This container will be used for the graphite tube test.
Chamber is being pumped down.
The HS cooling water valves are open and no leaks are detected.
TGHT will be ramped up to 580A at 0.2A/min
TBHT will be ramped up to 230A at 0.2A/min.
The temperature will be monitored and measured.
Sunday, October 06, 2013, 19:55
TGHT and TBHT have reached to 580A/230A, respectively. And the target has been heated for about 5 hours.
The temperature inside the tube is measure at 1000C; this is much lower than expected as to previously measured at 1700C.
The temperature outside the container is at 1400C.
I'm suspecting the thermocouple inside the tube could be shorted.
Cooling down the heaters down to zero at 2A/min for TGHT and 1A/min for TBHT.
Tomorrow, the chamber will be vented and the target will be inspected.
I like to re-adjust the thermocouple again, and re-heat the target back up, hoping to reach 1700C at TGHT = 580A.
Monday, October 07, 2013, 15:24
The sintering of the TaC coating is complete.
The chamber was vented this morning. Apparently, there was a short in the thermocouple so the temperature measure was recorded much lower.
The thermocouples are adjusted, and the chamber is pumped down.
Vac currently at 1.17e-6 Torr.
TGHT and TBHT will be ramped up to 580A/230A at 2A/min.
Continue monitoring the temperature...
Monday, October 07, 2013, 16:13
TGHT and TBHT were ramped up to 90A. Temperature inside the tube was measure just at 75C and the outside surface was at 207C.
Maybe the thermocouple is F up; will replace with a new one tomorrow.
Cooling down the target down...
Tuesday, October 22, 2013, 16:49
The target was heated up to 580A and the temperature inside the tube was measured to be ~1800C and the outside surface was ~1400C.
The target was cooled down. Then the graphite tube was inserted.
There are two thermcouples inserted inside the tube on both ends.
Chamber has been pumped down to 4.33 e-7 Torr. No leaks were detected.
Target will be heated up again to TGHT @ 580A / TBHT @ 230A at 0.2A/min.
The temperatures will be monitored.
T1 = left (floating)
T2 = right (toughing C-grv tube)
(wtf ionizer pointing into the page).
Thursday, October 24, 2013, 16:35
TGHT/TBHT reached to 580A/230A.
T1 = 1642C
T2 = Error?? Reading goes on/off intermittently, showing 900 - 1900C
Thursday, October 24, 2013, 16:45
Ramping up TGHT to 680A to see if T1 can reach 1700C.
IG1 currently at 5.2e-7 Torr.
Friday, October 25, 2013, 12:30
TGHT was ramped up to 632A (stopped due to voltage limiting).
T1 was measured at 1960C. Vac went up as it was heated up. (see attachment #2)
Target was cooled down at 5A/min, now at 0A.
The chamber will be vented and the target will be inspected.
This run is complete.
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