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Message ID: 413     Entry time: Friday, December 12, 2014, 14:09
Author: Anders Mjos 
Target/No.#:  
Source: LP-FEBIAD 
Station:  
Module:  
Target Oven W.O#: Tube only 
Heat Shield W.O#:  
Status: In progress 
Subject: HV BIAS Test 

BIAS current limit pot changed from 2.40 to 0.25
EZL current limit pot changed from 0.50 to 0.20

Testing max HV bias with Ray

Tested successfully to plc  limit of 50kV.

Dave M updated limit to 59kV. the limit will reset to 50 kV if PLC is restarted

Friday, December 12, 2014, 14:43: BIAS at 59kV and 55 uA. EZL at 20kV and 73 uA. No sparking observed.


Tuesday, December 16, 2014, 09:12: BIAS and EZL to 40kV and 20kV

Tuesday, December 16, 2014, 09:53: BIAS at 50 kV. One spark w/vaccum response at 50 kV

Tuesday, December 16, 2014, 10:20: BIAS and EZL to 0 to try and restart TP1B TP6

Tuesday, December 16, 2014, 10:33: Both turbos restated. BIAS and EZL at 50 kV and 20 kV

Tuesday, December 16, 2014, 11:23: BIAS at 60 kV. One audible spark with vacuum response.

Tuesday, December 16, 2014, 11:37: Another spark took out TP1B and TP6 again.

Tuesday, December 16, 2014, 11:42: Restarted TP1B and TP6


EE power supply switched on

Wednesday, December 17, 2014, 10:19: BIAS at 60kV for 10 min. EZL at 20kV

Wednesday, December 17, 2014, 13:13 : 3h at 60 kV (see attached screen shot)

Wednesday, December 17, 2014, 13:24: BIAS off

Wednesday, December 17, 2014, 13:40: All power supplies ON. TBHT autoramping to 290 A (240 A0. 4A / min

Wednesday, December 17, 2014, 13:46: IV4 opened

Wednesday, December 17, 2014, 16:10: Source on at 30 kV (previously tested to 50 kV)


Thursday, December 18, 2014, 08:21 : Starget autoraming to 290 A (240 A). 4 A / min

Thursday, December 18, 2014, 08:48: 40 kV

Thursday, December 18, 2014, 08:57: 50 kV

Thursday, December 18, 2014, 09:18: 60 kV. Extracting 1E-7 A on FC0

Thursday, December 18, 2014, 09:29: Increased COIL and ANODE to 3.6 A and 60 V

Thursday, December 18, 2014, 10:11: Large spark? Vacuum in source box compromised 6E-4 T.

Thursday, December 18, 2014, 10:24: Closed IV4 (red, but closed - IG6 vacuum good). Stopping turbos. Vacuum is increasing on CG1.

Thursday, December 18, 2014, 10:26: Shutting off water supply.

Thursday, December 18, 2014, 10:29: Venting through turbo vent valves.

Thursday, December 18, 2014, 10:35: Closed turbo vent valves.

Thursday, December 18, 2014, 10:37: Roughing

Thursday, December 18, 2014, 10:42: Pumping curve changing slope abruptly around 30 T and again around 2.5 T

Thursday, December 18, 2014, 10:48: Stopped roughing

Thursday, December 18, 2014, 12:14 : Venting

Thursday, December 18, 2014, 13:43: Roughing

 

Attachment 1: 2014-12-17_60_kV_3h.png  32 kB  Uploaded Wednesday, December 17, 2014, 13:24  | Show | Show all
Attachment 2: 60_kV_Test.docx  1.493 MB  Uploaded Tuesday, December 23, 2014, 08:26
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