John Wong wrote:

John Wong wrote: 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.    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.

 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

Wednesday, February 09, 2022, 06:55 

Target boat with a layer of niobium foil on the bottom used to heat up Nb samples to 1100 C for 4 hrs.

OMEGA slope = 0.99

The niobium samples are wrapped in a layer of  Nb foil.

Boat is wrapped with 2 layers of Nb foil.

Good vacuum 3.00e-02 Torr

Bad vacuum 5.00e-02 Torr

Autoramping TGHT at 3A/min to 180A, then monitor until desired temperature (based on eLog 550)

Initial IGP1=9.9e-07 Torr

Wednesday, February 09, 2022, 08:00

TGHT = 225 A, 3.2V

IGP1=  1.17e-06 Torr

OMEGA= 1100C +/- 12C fluctuations 

Wednesday, February 09, 2022, 11:55

TGHT=  225 A, 3.3 V

IGP1= 9.7e-07 Torr

OMEGA=1100C +/- 10C fluctuations

Wednesday, February 09, 2022, 11:56

Start cooling @-2A/min 

Wednesday, February 09, 2022, 06:55 

Target boat with a layer of niobium foil on the bottom used to heat up Nb samples to 1400 C for 4 hrs.

OMEGA slope = 0.99

The niobium samples are wrapped in a layer of  Nb foil.

Boat is wrapped with 2 layers of Nb foil.

Good vacuum 3.00e-02 Torr

Bad vacuum 5.00e-02 Torr

Autoramping TGHT at 2A/min to 200A, then monitor until desired temperature

Initial IGP1=6.0e-06 Torr

Tuesday, February 15, 2022, 12:44

Increasing ramp up to 3A/min to 220 A as pressure very stable

Tuesday, February 15, 2022, 14:04

ramped up manually to 1400C

IGP1 =3.9 e-06 Torr

TGHT = 340A, 5.5V

OMEGA = 1400 C

Tuesday, February 15, 2022, 14:21

Temperature on OMEGA up to 1413 C

Lowering current to 332A , OMEGA = 1400 +/- 5C

Wednesday, February 16, 2022, 11:43

On Tuesday February15, 2020 @18:04 started ramp down @-3A/min

Sample loaded into a vertical target boat. Flex line HS removed, SS waterline HS installed -AS.

Thursday, September 24, 2020, 13:22: Roughing.

Thursday, September 24, 2020, 13:54: Turbo pump on. 

Tuesday, May 08, 2018, 15:02

22 np-SiC fibrous discs loaded in the tube container (coated and sintered with TaC)

Heat treatment is similar to previous process, see elog #408. 

TGHT should be set at 330A/5.2V to reach temp 1575C (+/- 25).

Omega slope set at 1.05 (for carbide)

Chamber is currently being pumped down

 Tuesday, May 08, 2018, 22:46

Pressure at 2.2e-6 Torr.

Initiated autoramping at 0.2A/min to reach 330A

 Friday, May 11, 2018, 11:11

TGHT reached to 330A/5.1V but temp was measured at 1400A; It was held at that current for about 10 hours.

Increased TGHT to 335A/5.2V - temp is holding at 1420C (Will check the window if there is any coating that might have caused the discrepancy)

 Sunday, May 13, 2018, 00:25

In fact, the window is slightly coated.  The temperature should already be at optimum, 1600C.  Will keep heating for another day.

 Sunday, May 13, 2018, 14:10

Temp holding up well.. Pressure at 1.8e-7 torr. 

cooling down at 2A/min.

 Monday, May 14, 2018, 09:33

Target has been cooled for over 18 hours.  Pressure at 1.1e-7 Torr.

Venting chamber.

mass loss = (8.65 - 4.32)g = 4.33 g (50%) [slightly higher than expected, likely due to increase of 5A on TGHT]

Tuesday, May 01, 2018, 18:06

21 fibrous discs of nanoSiC are loaded into a tube container (coated/Sintered with TaC). 

Thermal treatment temperature at 1600C, TGHT is ~338A/5.5V, according to elog #407.

 Wednesday, May 02, 2018, 08:27

20 mins ago... initiate auto ramping at 0.2A to reach TGHT 250A.  Instead of ramping incrementally, TGHT jumped straight to 250A; vacuum shot up to milli torr.

Turn off TGHT immediately to let vacuum stable down to 10-6 Torr. 

System problem??  Archive striptool for more details. 

Re-activate auto-ramping - OK!

Once TGHT reached 250A (18 hours later from now), will continue ramping up to reach 1600C

 Friday, May 04, 2018, 01:09

TGHT just reach 250A, temp at about 1190C.  Pressure remained high at 4.2e-5 Torr. 

Continue autoramping to reach TGHT 300A.

 Friday, May 04, 2018, 11:07

TGHT at 300A for about 1.5 hr.  Temp at 1315C.  Pressure at 5.7e-6 Torr.

Autoramp to 320A.

 Friday, May 04, 2018, 14:39

Tapping up to 330A; temp at 1560C with slope changed to 1.05 (for carbide material). Will keep at this current/temp.

 Sunday, May 06, 2018, 13:25

TGHT at 330A/5.2V; holding temp at 1550C.  No coating on windows.  Pressure at 1.6e-7 Torr.

Cooling down at 2A/min. 

 Monday, May 07, 2018, 10:49

Evap cooled.  Venting chamber. 

Inspection of the discs next...

mass loss = 6.79 - 3.62 = 3.1 g (46%) [in agreement, good]

Tuesday, July 03, 2018, 17:02

49 discs/ 15.42g np-SiC fibrous discs loaded into the tube container

Heat treatment is similar to previous process, see elog#408/409.

TGHt should be set at 330A/5.2V to reach temp 1575C (+/- 25C)

Omega slope set at 1.05 (for carbide)

Chamber is currently being pumped down

 Wednesday, July 04, 2018, 10:38

Pressure at 1.5 e-6 Torr.

Initiated auto-ramping at 0.2A/min to reach 330A/5.2V.

 Monday, July 09, 2018, 14:44

TGHT has been stabilized at 330A/5.2V for 24 hours.  Pressure at 3.7e-7 Torr.

Temp was measured at 1400C - light coating on window likely affected the measurements.

Measured with one-color pyrometer on Ta body inside the target container = 1550 C (with the correction of 250C for Ta). 

Adjusted OMEGA slope to 1.18, temp currently at 1580 C.

 Monday, July 09, 2018, 16:42

Pressure stabilized at 3.5e-7 Torr. 

Initiated auto-cooling at 1A/min.

 Tuesday, July 10, 2018, 11:11

Target is at room temperature. 

Process completed; see attachment for the data retrieval and dropbox (np-SiC production folder) for screen capture.

mass loss = (15.42 - 8.09) g = 7..33 g (47.5%) [in agreement - good!]

Wednesday, September 27, 2017, 18:05

 3 samples from NS-npSiC pellets, pressured at 10T  (see lab book pg 53)

3 samples from B3 pellets, 600MPa (see lab book pg 50)

Desired temperature = 1550C, est current = 450A

 Thursday, September 28, 2017, 11:17

Vac at 8.8e-7 Torr.  

Ramping TGHT up to 450A at 0.2A/min

 Thursday, September 28, 2017, 17:54

Setup screen capture, see pg 53 for saved directory

 Friday, September 29, 2017, 23:54

TGHT reached to 450A/7.9V, temp at 1510C.

Tapping up TGHT to 465/8.2V to reach 1550C

Pressure coming down from 1.6e-6 Torr.

See attachment 1 for the 20-hour plot

 Sunday, October 01, 2017, 00:30

At around 20:00 on Sep 30, there was an increase of ~0.1 V which caused a rise in temp from 1550 to 1576C (see screen capture).  Pressure increased slightly.

Tapped down TGHT to 445A/8.05V; temp maintained at 1550C.

 Monday, October 02, 2017, 17:55

Cooling TGHT from 445A/8.07V, 1500oC to room temperature at 1A/min

 Tuesday, October 03, 2017, 11:09

Target has been cooled for over 10 hours. 

Venting chamber

Wednesday, August 03, 2016, 16:16

Tues July 26th had some problems with the transfer chamber

Transfer chamber was not going below -20in pressure, when usually it will drop all the way to -30in

To by pass and put the uranium target into the glove box, the transfer chamber was flushed 10x - when opened, no change in H2O and O2 in glove box; therefore, 'bypass' worked.

Pump removed and tested by vacuum group - showed no reading on gauge when being tested, how was it even pumping?

New pump installed July 27th.

New pump = bigger/ faster/ quieter 

 Tuesday, February 28, 2012, 10:36

Two thermocouples were inserted through the left side of the copper heat shield, see attachment #1.  One thermocouple is attached to the target tube with a Ta-wire, and the other is attached to the back block.

Data gathering: 

1.  Target heater (IEVAP2:TGHT) setpoint current/voltage  

2.  Target heater (IEVAP2:TGHT) readback current/voltage

4.  Tube heater (IEVAP2:TBHT) setpoint current/voltage

3.  Thermocouples voltages & controls' readback (IEVAP2:TCM) 

 The Helicoil had mostly pulled out of the old one.

Thursday, November 25, 2021, 13:58: Insulator replaced. EVAP 2 is ready for use with ISAC targets.

 Monday, December 11, 2017, 14:21

Dave updated evap2 interlock limits to 500mTorr for TGHT and TBHT on friday

Friday, July 31, 2015, 15:09

The left side port was installed on the evaporator #2.  Leak check was performed and no leak was detected. 

 Tuesday, May 15, 2012, 13:45

It was discovered that one of the insulators that supported the target module broke apart (see Attachment#1).  This might be caused by the heat from the target legs that reflected back from the base to the insulators.  The burnt marks are the evidence.  

A stainless metal sheet is used as the heat shield  (see Attachment #2). 

Tuesday June 16, 2015

An Extraction Insulator ITD0381 made from a different grade of AiN was installed in Evaporator 2 for testing purposes. The sub assembly included the SIS Restraint Housing ITD0389, New Extraction Insulator ITD0381, Repeller Electrode ITD0377, Extraction Electrode ITD0374 with fingerstock mounted.

The standoff insulator ITD0400 was found to be swelled up and broken. It was replaced with and glazed alumina insulator.

The tube heater Insulator ITD0342 - central support helicoil was repaired.

Flex line HS installed. New SS gaskets. 

Wednesday, August 12, 2020, 08:56: Roughing (Check).

Wednesday, August 12, 2020, 09:17: Ready for turbo pump.

Wednesday, August 12, 2020, 09:20: BP1 Off. Venting. 

 Dave Morris did a remote restart of the IOC after the outage. Turbo pump started.

Monday, July 31, 2017, 15:24

Turned on BV and TP this afternoon.

Started ramping down, ~1min after turned on both tripped off.

Vacuum box turned red.

IGP1 appears yellow but still registering a vacuum.

TP interlocks: requires IEVAP2:IGP1 < 500mTorr but IGP1 = 6mTorr when tripped off.

Should have been satisfied and therefore not tripped but IGP1 not communicating?

Nothing wrong with ion gauge in person, vacuum good on direct read out.

When attempting 'Global Reset', nothing would reset - vacuum box remained red etc.

See screenshot attached of errors.

 Tuesday, August 01, 2017, 15:31

Had kept BP, PV and RV overnight.

This morning vacuum fine, everything had reset except "IEVAP2:TP on" under device notes for IEVAP2:TP remained red.

Turned on BV and TP, once turbo pump registered on, red wording went away.

Currently pumping down - everything looks fine now.

Still unsure of reason for these errors...

 Friday, August 04, 2017, 10:55

Happened again last night at ~5:45 while evaps at ~420A - see elog i.d. 383 for photos and details.

 Wednesday, October 07, 2020

TP1 was not spinning up past 4krpm. Stalling & tripping out. Examined with Vacuum group, appears to be starting to seize. Exchange turbo pump.

Serial# 500937

Wednesday, October 07, 2020, 12:25: TP1 Exchanged. 

Wednesday, October 07, 2020, 12:38: Roughing. 

Wednesday, October 07, 2020, 13:55: Soft start initiated. Steps up krpm every 5 min. 10 steps.

Wednesday, October 07, 2020, 13:22 @ 24 krpm.  

Wednesday, October 07, 2020, 13:42: TP1 at speed. 38 krpm. 

Wednesday, October 07, 2020, 13:45: TP1 off. Soft start function off. Remote start configuration initiated. TP1 on. OK. 

Thursday, March 01, 2012, 14:35

Both the IEVAP2:TBHT and IEVAP2:TGHT maximum current setpoints on the vacuum page (see page: /edl/ievap2_vacuum1.edl) are wrong. 

For IEVAP2:TGHT, the maximum current setpoint should be 1500A (see page: /edl/ievap2tghtcp.edl), not 1000A. 

For IEVAP2:TBHT, the maximum current setpoint should be 500A (see page: /edl/ievap2tbhtcp.edl), not 300A. 

See attachement#1 for grabscreen. 

Fault: 5853