Interlock Defeat / Device Disable
Management System v1.5 (Driver)

Accelerator Complex:



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Implementation Removal

Interlock Defeat


Ion sources and injection BL

EGUN:BIAS interlock defeated, EGUN:CATHB signal forced and vacuum interlock changed
Implementation: Number:
2023-10-24 12:15:00 2023-576

Brandon Humphries

Removed
Estimated Duration:
1 weeks
To allow for EGUN:BIAS HV conditioning without tripping at the usual vacuum trip point or needing the EGUN:CATHB running.









To prevent trips and allow for conditioning, the EGUN:BIAS vacuum interlock was changed from 1e-7 Torr (interlock was "EGUN:IG1 < 100nTorr") to 1e-6 Torr ("EGUN:IG1 < 1uTorr").









For EGUN:BIAS HV conditioning, the HV cabling is configured in such a way that the EGUN:CATHB and EGUN:CHT are disconnected. To allow for the EGUN:BIAS to turned on for conditioning, the "EGUN:CATHB>50V" interlock has been forced to be okay. This allows for protection from the other EGUN:BIAS interlocks (instead of bypassing the EGUN:BIAS through EPICS as described in the procedure).









Defeat was approved by Friedhelm and implemented by Gelo (of Controls group).

2
1- On cork board in back of DCR





1- On safety system box on E-LINAC side of the DCR
"EGUN:IG1<100nTorr" interlock changed to "EGUN:IG1<1uTorr" and "EGUN:CATHB>50V" interlock was forced OK in the EGUN:BIAS interlock chain through the Controls system by a Controls group member.

The forced EGUN:CATHB interlock is only required for when beam is on, since the EGUN:CHT will also be disconnected there is no opportunity to create electron beam. EGUN:BIAS will still trip if vacuum spikes too high. This new higher vacuum trip level was approved by Friedhelm. New level will be verified during the next vacuum trip.


A2023-07-18-3


Brandon Humphries: 2023-11-24 16:03:05.034184
Defeat removed as part of WP#A2023-11-01-3.