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ATLis Comments Daily Digest
Vacuum Group Summary 2026-01-23
MCC IS UNSTAFFED
THOMSAS JEFFERSON NATIONAL ACCELERATOR FACILITY
MACHINE CONTROL CENTER UNSTAFFED STAMP
Date : 01/23/2026
Time : 17:08
Crew Chief On-Call : Price
Program Deputy : May
The MCC is unstaffed. The following satisfies AOD and LOD requirements to leave the control room unstaffed:
SSO Comments: Injector work concluded for the weekend.
Injector set to Restricted Access
ACG Report 01/23/2026
Moved database performance analyzer RHEL7 -> RHEL9 and upgraded to latest version
Released findioc v2-0; fix daemon crashing on RHEL9 and migrate from RHEL6
CED Design Hall B Collimator property catalog
Gun HV Turned Off
Gun HV Rampdown Initiated
"Trims in Inj and NL set to zero as requested by DC Power. Racks remain on"
iocwa3mag restored
COMMENT ON SAM 2025 Box Supply Work
BSList #117047: some data taken, but no optimal solution yet
All warm RF off. Loaded allsave #26441.
Improved setup for harp scans at IHA0I02 (some BPM-based lens centering, though still not automated). Allsave #26491.
In the figures, the BDL^2 on the x axis is that of MFX0I01 while the beam size is being recorded by IHA0I02. The u wire is recorded as well but not part of the analysis yet.
Figure 1: MFX1I03 = 218
Figure 2: MFX1I03 = 208
Figure 3: MFX1I03 = 198 (as found)
Figure 4: MFX1I03 = 188
With Wien off, none of the scans seems to get close to alpha=0 inside the Wien.
COMMENT ON Test beam envelope management around Wiens with strong spin flipper
The data taking for this test works but turns out to take longer than expected to find the correct solution.
Path forward:
1. Simulate expected result of lens scan for different settings with aberrated Wien model, see how wide the useful range of BDL values around the optimum should be.
2. Meanwhile, when a few hours of beam time are available, choose a single MFX0I01 setting that makes sense and scan harp vs MFX1I03, once with Wien off, once with Wien on, to see if any overlap can be found. This should tell us something in far less time.
When centering in MFX0I01, use IPM0I01B, not 0I01.
Autolog restore
Autolog restore
iocsb4bm restored
COMMENT ON Miscellaneous RF SAM work
Cryo-heater readback operational checks performed on the North Linac. Zone NL11 MOPS replaced for broken remote/local switch and heaters tested good after replacement. Swing heaters in NL21 not hooked up to Cryo's new PLC's yet so Robert Norton contacted and notified. He stated that they'll be able to get heat to them for their cryo fill next week. Insured that everything was attached to NL19, NL20 and NL21 mops and they where in remote. Techs: Adam,Trey, Matt and Chris!
Operator SIGN IN
Inj set up
Max generously gave me time to refine the set up to 1D. With no Wien angles and no spin flip I loaded up the centered beam we had yesterday. I checked centering in the lenses per the Gun->Pcup->1D procedures and got things pretty well dialed with no RF on to 1D with good centering (Fig 1). Rellying on Ben's previous work I loaded his chopper all save values. It still needs some work with the refinement of colinearity (Figs 2, 3, and 4 Are rels for BCD compared to A) and prebuncher/buncher phasing but I'm handing it back off to Max.










