Logbooks Lab Maintenance Evaporator_1 Evaporator_2 Laser cutter Target Production Test-Stand RH-ISAC RH-Cyclotron RH-Meson Hall RH-Beamlines RH-ARIEL
  Test-Stand  Not logged in ELOG logo
Message ID: 1046     Entry time: Friday, February 28, 2025, 17:16
Author: Dave Neilson 
Target/No.#:  
Source: LP-SIS 
Station:  
Module:  
Target Oven W.O#: 45447-17 
Heat Shield W.O#: 42972-2 
Status: Done 
Subject: UCx heat shield conditioning 

Friday, February 28, 2025, 15:54 : installed target assembly in test stand

Friday, February 28, 2025, 15:54  roughing

Friday, February 28, 2025, 17:16 Turbo pumps on

Monday, March 03, 2025, 15:00 Ramping TGHT/TBHT to 580/230A at 1A/30s

 Tuesday, March 04, 2025, 13:46  increasing BIAS/EE/EZL  to 30/2.5/13  kV 

Tuesday, March 04, 2025, 14:00  Optics on. SIS tune confirmed

Tuesday, March 04, 2025, 14:30   Mass scan complete - no end caps - no beam

Tuesday, March 04, 2025, 17:35 Current integrators appear to be down. Investigating further. 

Tuesday, March 04, 2025, 17:35    at 30kV, there was sparking once approximately every 5 minutes. over time, the voltage was decreased and at 26kV the spark frequency decreased to one every 20-30 minutes. This sparking appeared to be from BIAS to EZL based on the strip tool data. It was also silent, so likely inside the test stand chamber.  Two sparks over the HV time appeared to spike the TGHT current as well, although there was no disruption to TGHT operation

Tuesday, March 04, 2025, 17:38  HV BIAS / EE / EZL ramped down to zero

Tuesday, March 04, 2025, 17:38  ramping down TGHT/TBHT to zero at -1A/30s

Thursday, March 06, 2025, 09:45 Increasing BIAS / EE / EZL to 30/2.5/13kV to see if sparking persists while cold.

Thursday, March 06, 2025, 16:11 no sparks seen, even at 30kV

Thursday, March 06, 2025, 16:14  HV ramped down.

Thursday, March 06, 2025, 16:14   ramping back up TGHT TBHT to 580 230 at 1A/30s to reevaluate sparking

Friday, March 07, 2025, 09:06   ramped up HV/EE/EZL to 20/2.5/13 kV to continue HV conditioning. will be bumping up HV throughout the day depending on spark frequency

Friday, March 07, 2025, 23:30  ramped down HV/EE/EZL to zero, at end of day HV BIAS was at approximately 22kV after a 90 minute period of no sparking.

Saturday, March 08, 2025, 17:08    increasing HV/EE/EZL 20/2.5/13 kV  to resume HV conditioning.

Saturday, March 08, 2025, 23:59   At 30kV, no sparks seen for 30 min. Conditioning appears to have been effective. Suspicion is that the sparking is likely due to test stand infrequent use during improvements, etc.

Sunday, March 10, 2025, 00:07 decreasing HV/EE/EZL to zero.

Sunday, March 09, 2025, 00:13  cooling TGHT TBHT to 0A 0A at 1A/30s 

Tuesday, March 11, 2025, 11:36 Opened VV1 to atmosphere - Brady

ELOG V2.9.2-2455