Nikita Bernier wrote:

John Wong wrote: Nikita Bernier wrote: John Wong wrote: Tuesday, May 15, 2012, 12:24 The HP-SIS SiC target was made on Nov 03, 2010.  The target consists of 405 discs, 18.5cm in length.  It was sintered in the Evaporator#1.  This target is going into Evap#2 for re-conditioning.  It is currently being pumped down.    Friday, May 18, 2012, 12:19  The target is wrapped with only one heat shield. Evaporator #2 Target Heater is now auto-ramping at 0.5 A/min, up to 820 A, with the maximum voltage limited at 2 V, between 2.00e-05 (Good vacuum) and 3.00e-05 Torr (Bad vacuum). Tube Heater is auto-ramping at 0.5 A/min, up to 230 A, with the maximum voltage limited at 1 V. See attachments.  Friday, May 18, 2012, 13:15 Increased TBHT voltage to 5V, and TGHT to 15V.  Currently, TBHT =83A, 0.986V, TGHT= 144A, 1.65V, IGP1 = 5.2e-7 Torr, IGP2 = 4.3e-7 Torr.  Continue ramping up...   Tuesday, May 22, 2012, 12:02 TGHT and TBHT were ramped up to 830A/13.65V (local), and 235A/3.85V, respectively.  The target was conditioned over the long weekend.      Tuesday, May 22, 2012, 12:13 Initiating the cool-down process at 5 A/min. See archive plots of the Target Heater (Attachment 1) and the Tube Heater (Attachment 2).

 Tuesday, May 22, 2012, 15:24

TGHT/TBHT were ramped down to 0A.  The target has cooled for about 45 min.  All pumps and chillers are off.  The chamber has been vented.

Nikita Bernier wrote:

Nikita Bernier wrote: Thursday, April 05, 2012, 16:31 Target boat contains 6 BeO pellets : Sample,   Mass (g),   Thickness (mm),   Density (g/cm3) 1   1.2842,    5.406,        1.4647 2   1.2619,    5.150,        1.5108 3   1.2886,    5.316,        1.4946 4   1.2858,    5.310,        1.4931 5   1.3382,    5.520,        1.4948 6   1.3916,    5.650,        1.5187   Samples are made of BeO powder with 30% PVB which was treated at 400 RPM for 26 minutes. A ratio of 1:0.1 of mineral oil was added before another high speed treatment for 10 minutes. The powder was then pressed into pellets. Pellets are loaded on a target boat coated/sintered with TaC. The target boat is wrapped with a Ta foil that is 0.002 inches thick. **** Sintering is postponed until the situation with the ventilation in the lab06 is cleared. ****    Tuesday, May 22, 2012, 16:44 Target chamber is currently being pumped down. Leak check will be done tomorrow by turning on the cooling water for the heat shield.

 Wednesday, May 23, 2012, 17:38

TGHT was stepped up to about 55A before the auto ramping was initiated.  The vacuum limit parameter was set for good vac at <4.0 e-5 Torr and bad vac at >5.0 e0-5 Torr. 

The pressure is coming close to the trip limit (8.5 e-5 Torr) (see attachment 1: strip tool over the past 5 hours).  Changed the vacuum limit parameter:  good vac =3.0e-5 Torr, bad vac= 4.0e-5 Torr. 

 Saturday, May 26, 2012, 10:44

TGHT is auto ramping up smoothly as the pressure is regulating between 1e-5 to 4 e-5 torr.  (See attachment 2, past 21 hr)

Sunday, May 27, 2012, 12:25  

There could be a power bump  early this morning at 06:30hr, and tripped off the TGHT power supply (see attachment #3).  The computer in the cold lab was found to be off expectedly, so the alarm handler running on that computer was also shut off (*Need a UPS on this computer!)  

Called the ISAC Ops, and  nothing about any power bump around that time was noticed.  

Turned on TGHT p/s and set TGHT at 318A, local at 315A/4.58V.  TGHT has been running for about 10 mins.  Currently vac at 4.2e-7 Torr.  

Sunday, May 27, 2012, 12:35

Initiating TGHT auto ramping... 

 Monday, May 28, 2012, 00:20

TGHT has reached to 600A and will remain at that current for the rest of the night.  The target oven temperature will be measured tomorrow.

See attachment#4 for the striptool over the past 10hr.

 Monday, May 28, 2012, 10:56

TGHT stayed at 600A for about 12 hours.  Pressure gradually came down to 7.6e-7 Torr. (See attachment #5). 

At TGHT=600A, The target boat temperature was measured at 1400C (with the pyrometer), and the Ta-heat shield (1-layer) was at 1050C. [Note: These temperature measurements are very closed to the measurements with an empty LP target (with not heat shield), TGHT @ 600A = 1360C].

Monday, May 28, 2012, 11:04

Due to the water leak from the Evap2 chiller, the system has to be shut off for inspection. 

TGHT was tapped down to 0A.  The target was cooled down for about 20min before the chiller was turned off.

Will continue with the process after the problem is solved...

Monday, May 28, 2012, 11:08

It was discovered this morning that the Evaporator #2 chiller was leaking water from the bottom (see attachment 1).  A puddle of water was formed and eventually found its way down to the Hotcell. 

The evaporator was running over the weekend for the BeO pellets process.  The TGHT is now off and the chiller will be inspected... 

John Wong wrote:

Nikita Bernier wrote: John Wong wrote: Nikita Bernier wrote: John Wong wrote: Tuesday, May 15, 2012, 12:24 The HP-SIS SiC target was made on Nov 03, 2010.  The target consists of 405 discs, 18.5cm in length.  It was sintered in the Evaporator#1.  This target is going into Evap#2 for re-conditioning.  It is currently being pumped down.    Friday, May 18, 2012, 12:19  The target is wrapped with only one heat shield. Evaporator #2 Target Heater is now auto-ramping at 0.5 A/min, up to 820 A, with the maximum voltage limited at 2 V, between 2.00e-05 (Good vacuum) and 3.00e-05 Torr (Bad vacuum). Tube Heater is auto-ramping at 0.5 A/min, up to 230 A, with the maximum voltage limited at 1 V. See attachments.  Friday, May 18, 2012, 13:15 Increased TBHT voltage to 5V, and TGHT to 15V.  Currently, TBHT =83A, 0.986V, TGHT= 144A, 1.65V, IGP1 = 5.2e-7 Torr, IGP2 = 4.3e-7 Torr.  Continue ramping up...   Tuesday, May 22, 2012, 12:02 TGHT and TBHT were ramped up to 830A/13.65V (local), and 235A/3.85V, respectively.  The target was conditioned over the long weekend.      Tuesday, May 22, 2012, 12:13 Initiating the cool-down process at 5 A/min. See archive plots of the Target Heater (Attachment 1) and the Tube Heater (Attachment 2).  Tuesday, May 22, 2012, 15:24 TGHT/TBHT were ramped down to 0A.  The target has cooled for about 45 min.  All pumps and chillers are off.  The chamber has been vented.

 Monday, June 11, 2012, 12:20

After the re-conditioning, the target's end-caps vaporized.  This is something happened before (see elog entries below):

https://elog.triumf.ca/TIS/Evaporator_1/20

https://elog.triumf.ca/TIS/Evaporator_1/22

The caps were removed and yellow crystals were observed. (see attachment#1).

The D-caps will be inserted in both ends and will be re-conditioned again to see if the yellow crystals can be removed at high temperature.

Nikita Bernier wrote:

Wednesday, June 20, 2012, 17:23 New Target boat, with no coating, wrapped with a 0.002 inches thick Ta foil, contains NiO D-shape discs : Sample,   # Disks,    Mass (g),    Thickness (mm) 1    12,  1.9396,  1.938 2    13,  0.9592,  0.847 3    25,  2.6675,  3.06 See John's Ipad for their recipes. Evaporator #2 is now auto-ramping overnight at 0.5 A/min, up to 580 A, with the maximum voltage limited at 14 V, between 3.00e-05 (Good vacuum) and 4.00e-05 Torr (Bad vacuum).

Wednesday, June 20, 2012, 22:28

TGHT tripped off at 78A due to high out-gassing pressure.  The current was tapped down to 75A before it was turned back on. 

Changed ramping rate from 0.5A/min to 0.2A/min.  

Initiate auto-ramping... 

 Thursday, June 21, 2012, 08:35

Vacuum has come down to 7e-7 as TGHT is being ramped up at 0.2A/min. (see attachment#1).

Increase TGHT rate to 2A/min.

The temperature should be measured when the heater gets up to around 500A.

John Wong wrote:

Nikita Bernier wrote: Wednesday, June 20, 2012, 17:23 New Target boat, with no coating, wrapped with a 0.002 inches thick Ta foil, contains NiO D-shape discs : Sample,   # Disks,    Mass (g),    Thickness (mm) 1    12,  1.9396,  1.938 2    13,  0.9592,  0.847 3    25,  2.6675,  3.06 See John's Ipad for their recipes. Evaporator #2 is now auto-ramping overnight at 0.5 A/min, up to 580 A, with the maximum voltage limited at 14 V, between 3.00e-05 (Good vacuum) and 4.00e-05 Torr (Bad vacuum).   Wednesday, June 20, 2012, 22:28 TGHT tripped off at 78A due to high out-gassing pressure.  The current was tapped down to 75A before it was turned back on.  Changed ramping rate from 0.5A/min to 0.2A/min.   Initiate auto-ramping...   Thursday, June 21, 2012, 08:35 Vacuum has come down to 7e-7 as TGHT is being ramped up at 0.2A/min. (see attachment#1). Increase TGHT rate to 2A/min. The temperature should be measured when the heater gets up to around 500A.

 Thursday, June 21, 2012, 17:37

The NiO discs were heated up to 1500C at 560A.  The target heater was lowered in steps and the temperature was measured.  At 320A, the target container was ~1110C.  (see attachment #1) 

There was a sign of resistant on the target container as the p/s voltage started to go up at a higher rate.  (see attachment#2, 3, 4 for the archived striptool).

Unfortunately, the target container was broken; it was most likely reacted with the Ni.  (see attachment#5)

So.... the possible solution?!  TRY coating the container with Ta2O5.  Will discuss more in the Friday Jun 22 meeting. 

Thursday, July 12, 2012, 17:29

NiO was sprayed on Ni foil.

Average/discs: mass= 0.075g, thickness=0.076mm, density = 7.023g/cm3.

4 set of samples were loaded onto the targetboat (coated/sintered with TaC).  A piece of Ta foil was used as the under layer (see attachment #1).

A 0.002" thick Ta foil was wrapped around the container as the heat-shield.

The chamber was pumped down to 5.0e-6 Torr before the cooling water valve was opened; no leaks was detected.

For this process, the target heater will only go up to 250A (~1100C), with auto-ramping rate at 0.5A/min.

The heater has been stepped up to 50A, local 32A/ 0.23V.  The vacuum reached to max 1.6e-5 Torr, and it's coming down.

Thursday, July 12, 2012, 17:51

Auto-ramping initiated...

 Friday, July 13, 2012, 09:42

TGHT reached to 250A and stayed for 6 hrs (see attachment #2).  At that current, the target wasn't glowing so the temperature could not be measured. 

Initiated auto-cooling at 2A/min. 

Friday, July 13, 2012, 11:00  

TGHT reached to 65A.  Stopped the auto-cooling process and manually tapped down the p/s to 0A.  

Vacuum is stable at 5.7e-7 Torr.  

In the next 30 min or so, the chamber will be vented and the NiO target material will be taken out for inspection. 

Tuesday, July 17, 2012, 15:45

Target boat is filled with TaC coated regular- and D-endcaps. 

The boat is wrapped with a Ta heat-shield. 

Chamber is being pumped down, currently at 5e-6 Torr.

Tuesday, July 17, 2012, 15:58

Heat-shield cooling water valve opened; no leaks detected.

Initiated TGHT auto-ramping at 0.5A/min, set TGHT max at 580A.

 Wednesday, July 18, 2012, 10:44

Yesterday evening, the target heater tripped off a few times due to high vacuum excursion.  The TGHT ramping rate was low to 0.2A/min.  The current was ramped up sturdily to 500A this morning.  

Wednesday, July 18, 2012, 10:46

Increased ramping rate to 2A/min.  Vacuum currently at 2.2e-6 Torr.

 Wednesday, July 18, 2012, 16:18

TGHt has reached to 580A and stayed for about 5 hrs. 

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

 Thursday, July 19, 2012, 10:31

TGHT reached to 0A. 

Evaporator is off. 

Venting chamber... 

Thursday, July 19, 2012, 16:58

The target container was coated with TaC. 

It's wrapped with 3 layers of Ta as the heat-shield, including the backblock.

TGHT will be ramped up to 580A at 0.2A/min.

TBHT will be ramped up to 230A at 0.2A/min.

Currently, IGP1 = 1.5e-6 Torr.  BP = 15mTorr

 Friday, July 20, 2012, 13:56

TGHT and TBHT reached to 580A & 230A, respectively, and stayed for ~ 2hrs. 

Measured temperature at the ionizer tube to be 1630C.

Cooling down in process at 2A/min...

 Sunday, July 22, 2012, 20:53

The chamber was vented earlier around 14:00hr.  

The target container looks good! 

 Sunday, July 22, 2012, 20:30

The NiO target materials were loaded into the container today.  

Total discs = 500, (10 discs/pack) 

length (after loaded) = 9.0cm 

Target container is wrapped with Ta-heat shields, and will be removed after the sintering process. 

One regular end cap is inserted (with Ni-foil inserted as a divider).  The caps, however, are very loose (tried 2 caps and still loose).  Hopefully the thermo diffusion bonding will seal the cap... 

The other end is inserted with a D-cap for out-gassing proposes, and will be replaced with the regular end-cap after the process. 

(see attachment#1)

Sunday, July 22, 2012, 20:48 

The camber has been pumped down and currently IG1=1.3e-6 Torr.

The HS cooling water was turned on and no leaks were detected.  

TGHT and TBHT were stepped up to 50A. 

Auto-ramping is initiated at 0.2A/min for TGHT max = 250A, TBHT max = 230A. 

 Thursday, July 26, 2012, 23:31

TGHT and TBHT have reached to 250A (local @ 242A/2.88V) and 230A, respectively, and have stayed for ~4hrs (see attachment#2)  

Currently, IGP1 = 4.9e-7 Torr, IGP2 = 3.5e-7 Torr, CG1B = 13mTorr. 

Initiating auto-cool down at 2A/min.  

 Monday, July 30, 2012, 15:11

The chamber was vented and the target was removed.

There was significant condensation oily fluid coated Cu-heatshield lid and around the ionizer opening.

Overall, the target looks very good.  The NiO target material was nicely sintered.  No shrinkage or loose particles were observed (see attachment #3).

The endcap, however, was not properly fitted and it just fell off, (see attachment #4). 

Both ends of the target are currently opened; the expension tool for the endcap is in order and hopefully this will solve the problem.

The target is being stored in the fumehood

Monday, July 30, 2012, 15:38

The evaporator was used for the processing the NiO target for 8 days and it was discovered today that there was a puddle of water underneath the chiller. 

The cover of the chiller was removed and some water around the plumbing was found (see attachment #1). 

Will continue to keep running the chiller to see if there is more water leaking out...

Tuesday, August 14, 2012, 15:01

The Cu-heatshield insulators are broken due to prolong heating time during the target processes (see attachment#1). 

The insulators are replaced with the MM800 type (see attachment #2).

Tuesday, August 14, 2012, 15:44

This SiC target was prepared in May 2011 with the Evaporator#1.  The target will not used for online. 

Two endcaps were inserted with the new expansion tool.  The target will be heated up to the normal operating condition (TGHT =580A, TBHT = 230A). 

The chamber is currently being pumped down. 

 Tuesday, August 14, 2012, 16:21

Earlier, the Cu-heat shield was removed from the evaporator to replace the insulators, so all the seals were placed with new ones.  However,

there seems to be some leaks after the HS cooling water is turned on.  (see attachment#1).

The TP off, and the chamber is vented for investigation.

 Tuesday, August 14, 2012, 17:25

All the 3 seals for the Cu-heat shield were replaced.  The chamber has been pumped down and the HS water valve is open.  No leaks are detected.

Tuesday, August 14, 2012, 17:29

Initiated auto-ramping at 2A/min for both TGHT and TBHT.

Parameter constraints: good vac @ 2.0e-5 Torr, bad vac @ 3.0e-5 Torr.

Currently, IG1 @ 6.5e-6 Torr.

 Wednesday, August 15, 2012, 09:52

TGHT and TBHT have reached to 520A and 230A, respectively, and have stayed at the currents for about 10 hours. (see attachment #2) 

IG is currently at 7.7e-7 Torr.  

Initiating auto-cool down at 2A/min. 

 Thursday, August 16, 2012, 11:23

Chamber is vented.

Nikita Bernier wrote:

Nikita Bernier wrote: Nikita Bernier wrote:  Friday, August 10, 2012, 19:54   Target boat with TaC coating, inside covered with a 0.002 inches thick Ta foil, wrapped with a 0.002 inches thick Ta foil, contains a Ta foil with TaO coating. See John's Ipad for their recipes. Evaporator #2 is now auto-ramping overnight at 0.2 A/min, up to 830 A, with the maximum voltage limited at 14 V, between 2.00e-05 (Good vacuum) and 3.00e-05 Torr (Bad vacuum).    Saturday, August 11, 2012, 19:15 Heating process was going smoothly up to 400 A. See Attachment 1. Around 420 A, vacuum went up again and the voltage increased more quickly. It seems like resistance is building up. After reaching 530 A, the current was tapped down to 420 A in an effort to save the Ta boat. See Attachment 2. The current will stay at 420 A for the weekend until John takes a look at this.    Monday, August 13, 2012, 13:46  TGHT was ramped down at 2 A/min and then tapped down to 0A. See Attachment 1.  The target boat will be cooled down for about an hour before turning off the chiller.

 Tuesday, August 14, 2012, 16:56

Summary:

The purpose of this experiment is to test the chemical and high temperature (1600C) resistance of a Ta foil (0.001" thick) coated with Ta2O5, so it can be used as the under-layer for the BeO sintering process.

The Ta2O5 (white powder, -325 mesh) was prepared in a non-aqueous solution and was sprayed on a piece of Ta foil. 

The coated foil was rolled up and inserted in a Ta-coated (previously sintered) target boat for heating.

The foil was heated up to 520A (~1200C) and evidently,Ta2O5 started to react with Ta foil, and the foil became brittle and cracked (see attachment#1).

In conclusion, Ta2O5 is not a good protection layer for Ta material - at least for our applications.

Wednesday, August 22, 2012, 17:25

Note:  LP-FEBIAD target container ( W.O#37918-3) was coated with TaC and sintered on July 19 for UCx#5 target.  Then, a last minute request from the Sci Dev. to run the UCx#5 in LP-SIS. 

The target container was coated with TaC  (Using IR heat lamp to speed the drying time)

It's wrapped with 3 layers of Ta as the heat-shield, including the backblock.

TGHT will be ramped up to 580A at 0.5A/min.

TBHT will be ramped up to 230A at 0.5A/min.

Chamber is currently being pumped down.

 Wednesday, August 22, 2012, 18:27

Chamber was pumped down to 5.4e-6 Torr; the HS cooling water valve was opened and no leaks were detected.

Stepped up TGHT/TBHT to 20A.

Initiated auto-ramping...

 Friday, August 24, 2012, 00:21

TGHT/TBHT have reached to 580A/230A, respectively, and have remained at the currents for ~10hrs.

Current, IG1 is at 9.3e-7 torr.  The sintering process is done.

Initiating auto-cool down at 2A/min.

 Friday, August 24, 2012, 13:31

TGHT & TBHT power supplies are off.

The chamber is vented.

Wednesday, October 10, 2012, 16:35

Target container is coated with TaC.  No Ta-heat shields are used.

TGHT will be ramped up to 580A at 0.2A/min.

TBHT will be ramped up to 230A at 0.2A/min.

Chamber is currently being pumped down

 Wednesday, October 10, 2012, 17:31

Chamber was pumped down to mid 10-6 Torr.  HS water valve was opened and no leak in vacuum was observed.

TGHT and TBHT were stepped up to 30A.  Everything seems fine...

Initiated auto-ramping:  Good vac = 2.0e-5 torr, Bad Vac = 3.0e-5 Torr. 

 Thursday, October 11, 2012, 10:35

TBHT has reached to 230A, 3.52V. 

TGHT has reached to 232A.  Vacuum is stabilizing at 8.0e-7 Torr, BP at 19 mTorr. 

Increased TGHT ramping rate to 2.0A/min. 

 Thursday, October 11, 2012, 14:55

TGHT reached to 580A/9.95V, local 575A/10.03V. 

TGHT at 230A/3.62V

Local target container temperature measured at ~1430C, central block at ~1220C

IGP1 currently at 1.68e-6 Torr. 

Heaters will be remained on for another 2 hours or so before auto-cooling is initiated.

 Thursday, October 11, 2012, 17:49

Target container has been heated for over 4 hrs.

IGP1 @ 1.10e-6 Torr, BP @ 18mTorr

Auto-cooling initiated, rate @ 2A/min.

 Friday, October 12, 2012, 10:02

TBHT/TGHT have reached to zero current. 

P/S off.

Venting chamber..

see attachment#1: striptool archiver

 Tuesday, October 16, 2012, 10:35

Container looks good.  It will be used for TiC#3

Tuesday, October 16, 2012, 14:12

Target is filled with 360 discs of TiC (with 1 mole of graphite) backed on C-grv foil.  

No Ta heat-shields wrapped around the container.

One regular end-cap is inserted and expanded.  The other end is inserted with a D-cap for out-gassing.

Re ionizer foil is inserted.

TGHT will be ramped up to 580A, TBHT to 230A; ramping rate at 0.2A/min.

Chamber is currently being pumped down...

 Tuesday, October 16, 2012, 16:11

HS water valve is opened.  No leaks is detected.

Vacuum is coming down steadily.  IGP1 currently at 1.7e-5 Torr.

 Wednesday, October 17, 2012, 11:41

The chamber was pumped down overnight.  IGP1 reads at 5.8e-7 Torr.

Both TGHT & TBHT were stepped up to 30A. P/S OK! 

Initiated auto-ramping...

Monday, October 22, 2012, 10:58

TGHT and TBHT have reached to 580A & 230A, respectively (see attachment#1).

IGP1 currently at 6.27e-6 Torr.  BP@20mTorr.

Currents will remain at max for another 3 hours. 

Local temperature measured at 1500C (container surface), 1300C (center block)

 Monday, October 22, 2012, 17:27

Auto cooling initiated.

 Tuesday, October 23, 2012, 17:54

TGHT & TBHT are at 0A.  P/S & pumps off. 

The chamber will be vented, and the target will be taken out for inspections.

Friday, January 11, 2013, 10:59

The insulator that holds the terminals was broken when a target container was installed.  The insulator had seen so much heat shine from the Cu heat-shield gaps, see attachment.  Tightening the bolts on the target container might further put more force on the insulator and eventually broke it.

To prevent this to happen again.  The Cu-heat shield gaps have covered with Ta-foil to prevent any shine from the target  container onto the insulator.  Also, a torque wrench will be used to tighten the bolts on the terminals.  At this point, we don't know the max torque the insulator can tolerate.  Some measurements were done on the target resistant (ohm) as a function of torque (in pounds).  The best torque to tighten the terminal bolts is 150 lbs. 

 Friday, January 11, 2013, 13:52

TEST#1

A new target boat is coated with TaC and will go through the sintering process at 580A (max).  Ramping rate 5A/20min.

For this test, two thermocouples are installed to measure the temperature of the container.  The QMS is also operating to analyze the gases. 

See attachment#1 for the thermocouple setup.  Note:  No Ta heat shield is used to wrap around the target container.  

See attachment#2 for an example of the QMS and temperature measurements.  

More details about the results later...  

Tuesday, January 22, 2013, 12:19  

The test was successfully complete. 

Short summary of the results: 

1.  A significant difference in the temperature dependence on the heater current could be found when ramping up/down (see attachment #3). 

2.  A difference of 200 C at the highest temperature was between the two thermocouples were measured. 

3.  The measured temperatures are lower than previous measurements with a pyrometer on an empty LP target container (see attachment#3).

4.  RGA spectra show most of the higher mass organic molecules are gone after initial heating at low temperature.  

5.  Above 560A, CO2 shows up again and decreases up to about 680A heating current. (see attachment #4).

6.  After running at high temperature for some time, only H2O & CO and their constituents are left.  (see attachment #5).

Data can be found on my dropbox, folder "RFQ-test\Test#1-ver1.0"

Next:  Re-heating the target

Tuesday, February 12, 2013, 17:10 

TEST#2: Re-heating the target again.  See if it fit the curves. Measuring concentrations of 14N, 16O, 18H2O, 28CO, 32 CH3OH, 40Ar, 44C02. 

Ramping rate 1A/min

Wednesday, March 06, 2013, 18:14 

Test#2 complete.  Data can be found on my dropbox, folder "RFQ-test\Test#2-ver1.0"

Wednesday, March 06, 2013, 18:14 

Test#3:  RFQ target container_version 2.0, thermal test.

Measuring back block temperature & analyze gases.  

Data can be found on my dropbox, folder "RFQ-test\Test#3-ver2.0"

 Tuesday, January 22, 2013, 12:38

This is to test the newly developed RFQ target to be commissioned this year.  The purpose of this test is to see how well the RFQ components can sustain the high temperature.  One thermocouple is connected inside the target and the other is connect outside of the Cu heat-shield.  RGA will be running to analyze the gasses. 

TGHT will be auto-ramped up at the rate of 5A/20min to max current at 1000A.  

More info later... 

Wednesday, February 06, 2013, 16:11 

Heat testing Test#1 complete.  Data acquisition in progress....  The test was successful. 

Re-heating Test#2 is in progress.  This time, with a new re-design target container (less black block mass).  Two thermocouples are connected:  One on the back block and the other inside the RFQ components.  

The TGHT current will go up to at least 580A and the gasses will be monitored with the RGA. Ramping rate:  0.5A/min.  Set final current at 400A for now. 

TBHT will remain off at this point until we can know the temperature when TGHT is up to 580A.  

 Thursday, February 07, 2013, 11:39

TGHT reached to 400A/6.30V. 

Back block temperature measured at 18.307mV = 1003 C. 

RFQ component temperature measured at  = 143 C.

TGHT will be ramped up to 580A. 

Continue to monitor...

 Saturday, February 09, 2013, 09:40

TGHT at 580A, TBHT at 271A (setpoint).  Seeing CO2 gassing out.  Ramped down TBHT to zero A and continue to monitor.

Tuesday, February 12, 2013, 16:39  

TGHT heated up to 580A and remained at that current over the long weekend.  

The thermocouple on the back block was reading wrong because the wires away from the tip were fused to the container at high current.  (see attachment #1) 

TBHT was ramped up to 300A and then lower to 280A; mass 32 (CH3OH), and 44 (CO2) were detected.  This is unusual at 580A = 1200C. 

Both TBHT and TGHT were ramped down to zero and the outgassing of these molecules continue to detect on the RGA. (see attachment #2).  Suspect of these gasses from the Cu heat-shield or the thermocouple SiO insulator.

For complete process on screenshots, see my dropbox.

Next:  Coat this container with TaC and use for the SiC target.