[Lerftest] LERF Update

Shukui Zhang shukui at jlab.org
Tue Sep 15 08:23:06 EDT 2020

This may need attention. Maybe a question for SSG?

While helping with the MPS work last night I found The fibers on Rack 2B10 are either mislabeled or plugged in wrongly, #9 finer is in #7 connector, #7 fiber is in connector#8. Is this part of the issue?

Right now, MPS does not send proper control to DLPC.
From: Lerftest <lerftest-bounces at jlab.org> on behalf of Kevin Jordan <jordan at jlab.org>
Sent: Tuesday, September 15, 2020 7:36 AM
To: lerftest at jlab.org <lerftest at jlab.org>; isotope-prod at jlab.org <isotope-prod at jlab.org>; Jay Benesch <benesch at jlab.org>
Subject: [Lerftest] LERF Update

Started shift finishing up a few items left on MPS checkout, this took longer than expected & consumed the day shift. Swing shift had gun HVPS MPS interlock problem, this was fixed and then is was discovered that the Drive Laser Pulse Controller (DLPC) was not “talking” with the MPS (there are 8 fiber optic cables, when all are active CW is allowed, each one has a lower beam power limit). System expert was not able to come in to fix problem last night so it will be addressed first thing this AM.
Pulsed mode operations began to find remaining problems. There were also a couple viewer/camera issues that need repair. Beam threading to 1X will continue this morning.

Swing shift summary:
Gun HVPS controller repair in progress at start of shift, completed around 17:00. MPS checkout of gun completed.
DLPC SSG certification started. Certification punted until tomorrow morning when hardware was found to behave inconsistent with what was expected.
EES-Rf contacted to assist with tuning 4L02-1.
Quads reloaded from March 10 all-save.
Pulsed mode beam sent as far as 1F05, and all-save taken.
Shutdown script run and turned over to MCC for hot standby.
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