[Hallc_running] [New Logentry] RC Daily Update

cyero at jlab.org cyero at jlab.org
Sat Sep 17 07:45:02 EDT 2022

Logentry Text:
During Sep 16 Swing Shift, Ops was able to deliver beam to Hall C quickly. 

A harp scan was done on with satisfactory results on: 
IHA3H07A -->  https://logbooks.jlab.org/entry/4042622 
IHA3H07B -->  https://logbooks.jlab.org/entry/4042625

Then we moved on to doing "Aluminum Hole" check, however,
there was an issue with the target added NOT moving to the "Hole"
position. We contacted target experts, and temporary procedure has been

Instructions for moving the target to "Hole" --->  https://logbooks.jlab.org/entry/4042703

We verified motion to all other targets, except the "Hole" position. Currently
issue is being diagnosed by Chris Keith / D. Meekins

MCC then decided they wanted to do Ion chamber procedure first with no target (rather than "Aluminum Hole" check), 
and so the beam was moved to "Home" (no target).  For this procedure, they also require us to ramp SHMS magnets to zero
(I would have preferred that SHMS be rotated away from beamline rather than ramping down magnets, 
assuming it has to do with magnets field affecting the beam downstream. But maybe this has not worked
in the past?? Will try to follow up and ask about it.)

While MCC was sending beam for ion chamber calibrations, they informed of lost vacuum downstream
of beamline (valve VBV3H08A closed) ---> https://logbooks.jlab.org/entry/4042671

As of 7:00 AM today,  Hall C has gone to "Controlled Access" and  techs have arrived at 
Counting House to diagnose this issue. 

Once vacuum is re-established downstream beam line:
1) MCC will continue to do Ion Chamber calibration
2) Hall C will do Beam Checkout procedure followed by trigger checkout
3) Begin CaFe special studies / production 

We'll have brief RC meeting at 11 AM to discuss any outstanding issues:

Here is the zoom link:


This is a plain text email for clients that cannot display HTML.  The full logentry can be found online at https://logbooks.jlab.org/entry/4043000
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