Venting chamber and purging cooling lines in preparation for target removal

Anders Mjos wrote:

Venting chamber and purging cooling lines in preparation for target removal

 Monday, April 16, 2012, 11:55: Target removed. Cooling lines must be blanked off before pumping down.

 When the target was removed from the test stand it was discovered that the custom designed insulator stand-off (ITD0400 made from Mycroy 1100) had swollen and become discoloured in the area exposed to "heat shine" from the target oven. See attached pdf for photos of the insulators.

The heat shield lid was opened up and the target temporarily removed to replace the two insulators that had failed. These were replaced with the commercially available glazed steatite stand-offs. The target had some marks from the insulators which was cleaned with acetone and methanol.

After replacing the insulators, the target assembly was assembled, leak checked and a new electrical check was performed.

Additional photos are available on DocuShare

Replacement for Nb#10

Friday, August 25, 2023, 17:15: Roughing.

Friday, August 25, 2023, 17:57: Vacuum taking a while to rough down. Vacuum @ 1.034T. Opened FS#5.

Friday, August 25, 2023, 17:59: Water leak noted. Venting.

Friday, August 25, 2023, 18:27: The left HS waterline was not tight. Chamber is cleaned out & wiped down.

Friday, August 25, 2023, 18:28: Roughing. Purge on RP1

Friday, August 25, 2023, 19:00: Open closed ballast repeatedly on RP1 to purge excess moisture.

Friday, August 25, 2023, 19:05: FS#5 open. No effect on vacuum. Vacuum @ 2.228T & dropping. Power / sources on.

Friday, August 25, 2023, 19:18: Quick bypass check with "IG1 on". Tapped up TGHT / TBHT to 5 A each, & down again. 500 V on & off the BIAS. ok. Bypass removed. Vacuum @ 1.222T. Will remote start TP later. Allow vacuum to stabilize. Otherwise ready for remote operation.

Friday, August 25, 2023, 23:14: Vacuum @ 0.135T. TP1B on. 

Friday, August 25, 2023, 23:20: TP1B at speed. CG1 @ 0.165 T - Allow to stabilize. 

Friday, August 25, 2023, 23:26: CG1 @ 0.091 T. TP1A on.

Friday, August 25, 2023, 23:36: TP1A Tripped. Reset & restart. TP1B off.

Saturday, August 26, 2023, 00:02: The  TSG:CG1A limit to open needs to be increased from 0.050T to 0.100T. Currently at 0.070T. Unable to restart the TP until it's below the limit. Will wait till morning... Later in the morning.

Saturday, August 26, 2023, 09:19: TP1B switched on. 

Saturday, August 26, 2023, 10:08: TP1A switched on.

Saturday, August 26, 2023, 10:16: TP1 A tripped. Reset right away - CG1A @ 0.048T. 

Saturday, August 26, 2023, 10:17: IG1 on. 

Saturday, August 26, 2023, 16:40: IV4 open.

Saturday, August 26, 2023, 16:41: Optics set. Vacuum @ 5.63e-06T 

Saturday, August 26, 2023, 23:43: Vacuum @ 4.46e-06T. Auto-ramping TGHT / TBHT to 350 / 150 A @ 2 A per minute. Expecting outgassing however. 

Sunday, August 27, 2023, 09:11: Vacuum @ 5.10e-06T. TGHT / TBHT @ 350 / 150 A. Auto-ramping TGHT to 400 A. 

Sunday, August 27, 2023, 10:44: Abort TGHT @ 383 A. Auto-ramping TGHT / TBHT to 500 / 200 A.

Sunday, August 27, 2023, 19:13: Vacuum @ 5.08e-06T. TGHT / TBHT @ 422 / 189 A. Auto cool TGHT / TBHT to 250 / 100 A @ 4 A per minute.

Sunday, August 27, 2023, 20:06: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2 A per min. 

Sunday, August 27, 2023, 22:43: Halt auto-ramp @ 490 / 230 A. 

Sunday, August 27, 2023, 22:50: BIAS / EE / EZL @ 30 / -1.5 / 13 kV. 

Sunday, August 27, 2023, 22:52: Begin mass & wire scans. Manually tap up TGHT to 500 A. Vacuum @ 5.36e-06T 

Sunday, August 27, 2023, 23:04: Manually tap up TGHT to 505 A 

Sunday, August 27, 2023, 23:09: Manually tapped up TGHT to 520 A.

Sunday, August 27, 2023, 23:11: Increase TSH auto-ramp vacuum limit from 5.00e-06T to 6.00e-06T. Auto-ramping TGHT to 580 A @ 3A per min.

Sunday, August 27, 2023, 23:25: TGHT up to 554 A . Vacuum limit reached. Take mass & wire scans.

Sunday, August 27, 2023, 23:59: Peak on Mass 40. Otherwise mostly back round.  

Monday, August 28, 2023, 00:02: Reset TSH auto-ramp vacuum limit to 5.0e-06T. Auto-cooling @ 2A per minute.\

Monday, August 28, 2023, 00:09: HV tapped down to 0 V. 

Monday, August 28, 2023, 06:08: IV4 closed. Sources off. 

Monday, August 28, 2023, 06:09: IG1 & turbo pumps off.

Monday, August 28, 2023, 07:30: Power off. Venting. Purge FS#5.

Thursday, July 06, 2023, 16:13: Roughing.

Thursday, July 06, 2023, 16:41: TP1B on.

Thursday, July 06, 2023, 16:47: TP1A on.

Thursday, July 06, 2023, 16:55: TP1A Trip, reset.

Thursday, July 06, 2023, 16:56: IG1 on.

Thursday, July 06, 2023, 16:58: Vacuum @ 1.32e-05T. Waterline FS#5 open.

Thursday, July 06, 2023, 17:02: Power's on. HV Rack is open.

Friday, July 07, 2023, 06:52: Auto-ramping TGHT / TBHT to 350 / 150 A @ 2A per minute. Vacuum at 5.02e-07T

Attempted to open IV4, however it timed out.

Friday, July 07, 2023, 08:25: IV4 reset & opened.

Friday, July 07, 2023, 09:02: HV on.

Friday, July 07, 2023, 09:40: BIAS / EE / BIAS @ 30 / -1.5 / 13 kV. 

Friday, July 07, 2023, 10:10: Auto-ramping TGHT / TBHT to 580 / 230 A @ 2A per minute. Vacuum at 6.34e-07T

Friday, July 07, 2023, 10:28: Optics set. FC0 @ 3.36e-11, set from 1uA to 100 nA.

Friday, July 07, 2023, 10:59: Reduce BIAS to 20 kV due to sparking.  

Friday, July 07, 2023, 12:24: BIAS back to 30 kV. TGHT / TBHT @ 580 / 230 A. FC0 @ 2.52e-09. Vacuum @ 1.32e-06T. Beginning mass & wire scans.

Friday, July 07, 2023, 16:57:  BIAS / EE / BIAS @ 0 kV.

Friday, July 07, 2023, 16:59: Vacuum @1.14e-06T. Auto-cooling @ 2 A per min. 

start high voltage and heaters

mass scan has been started after optimization on 23Na

Fc0 23 nA

IG1 9.9e-7 T

start automatic heater ramping down

The helium bottle was found empty.

Rick will refill it and hook the leak detector on the system to find out

if we have a leak on the line.

Rick put the helium bottle back in the rack.

Waiting for status of the gas lines.

1524H Start small pump.

1529H stop the pump.

   The insulator for the tube heater was observed to be glowing with a blue shine when the target was on high voltage. The insulator was glowing on the side closest to the 9-pin connector. See attached photo.

Venting for target exchange

Testing FEBIAD anode end cap as per dwg ITD0304 REV C

Target with TUBE ONLY. Do not use target heater.

Tuesday, June 26, 2012, 18:03: Roughing

Tuesday, June 26, 2012, 18:24: Turbos started

Tuesday, June 26, 2012, 18:31 : Turbos at speed. Vacuum at 1.8E-5

Wednesday, June 27, 2012, 08:48: Cooling opened. Vacuum stable at 4.2E-7. Ready for testing.

Replaced grid containing ring (target side) with new ring. No contact between target and anode measured in lab.

NOTE: While closing up the VCR fittings the tube rotated causing the tube to flatten in a bend. This may reduce water flow on the heat shield circuit. (see attachment)

Wednesday, July 04, 2012, 15:33: Started roughing.

Wednesday, July 04, 2012, 15:57 : Started turbos

Wednesday, July 04, 2012, 16:03: Turbos at speed. Vacuum at 3E-5

Anders Mjos wrote:

Replaced grid containing ring (target side) with new ring. No contact between target and anode measured in lab. NOTE: While closing up the VCR fittings the tube rotated causing the tube to flatten in a bend. This may reduce water flow on the heat shield circuit. (see attachment) Wednesday, July 04, 2012, 15:33: Started roughing. Wednesday, July 04, 2012, 15:57 : Started turbos Wednesday, July 04, 2012, 16:03: Turbos at speed. Vacuum at 3E-5

 Thursday, July 05, 2012, 08:39: Water supply open. Vacuum stable at 5.9E-7. Due to the kink in the heat shield cooling line, flow in the heat shield line is lower than other lines (visually inspecting speed of paddle wheels).

See attached file for photos of the broken tube 

Variable leak valve with serial number F3-592 has been replaced by F3-649 due to regulating problems described previously by Fridhelm Ames.