Aggregator

Log Number: 4544604Logbook(s): 

• ELOG

Entry Makers: anthonyBody: 

Cavities 7 and 8 did not have any FE by DecaRAD measurements. The cavities were set up just like the others, but no counts on the DecaRADS.

Log Number: 4544603Logbook(s): 

• POLOG
• ELOG

Body: 

Performed QE scans with unmasked activation:

Beam QE Scan: https://logbooks.jlab.org/entry/4544449

Low-voltage scan: https://logbooks.jlab.org/entry/4544366

Log Number: 4544597Logbook(s): 

• ELOG
• POLOG

Body: 

Log Number: 4544538Logbook(s): 

• ELOG
• POLOG

Body: 

Completed. Covered work done in March 2026.

Log Number: 4544535Logbook(s): 

• ELOG

Tags: 

• Autolog
• MCC8am

Body:  */ ATLis Comments Posted 18:00 Sunday August 23 through 18:00 Monday August 24 AES I&C Systems Ion Pak Maintenance (2026 SAM)

2026-08-24 08:08 - Mathew Almodovar-Mercado

Ap

Log Number: 4544534Logbook(s): 

• ELOG

Body: 

Labels updating for the BLMs HV cables in the BSY is completed. Started working on the labels updating for the WA.

Log Number: 4544528Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

Cavity 1: Starting GLOS = 2.16, starting GDCL = 7.0. Quench limited to 14.7 MV/m.

Cavity 2: Starting GLOS = 1.22, starting GDCL = 9.9. Reached admin limit before any quenching.

Cavity 3: Starting GLOS = 2.45, starting GDCL = 9.9. Quench limited to 18.0 MV/m.

Cavity 4: Starting GLOS = 0.82, starting GDCL = 9.9. Quench limited to 21.4 MV/m.

Cavity 5: Starting GLOS = 1.18, starting GDCL = 9.9. Quench limited to 19.8 MV/m.

Cavity 6: Starting GLOS = 3.21, starting GDCL = 9.9. Reached admin limit before any quenching.

Cavity 7: Starting GLOS = 2.23, starting GDCL = 9.9.

Log Number: 4544520Logbook(s): 

• ELOG

Body: 

In Step 24, the procedure states to start the data collection script when a single decarad head is reading ~10,000 counts. In lieu of that, push the cavity to its quench limit (find where it quenches 3x) and start the data collection there.

Log Number: 4544518Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Anthony
DATE:             08/24/2026
SHIFT:               Swing

The operator has read the following:

• ELOG
• PD Shift Plan
• Radiation Surveys for PSS Segments in Controlled Access
• PSS Log

Log Number: 4544496Logbook(s): 

• ELOG
• LERFLOG

Tags: 

• ShiftSummary

Body:  LERF SHIFT LOG Summary

Start of shift: Controlled access at LERF.

Log Number: 4544468Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl06
Data from: /usr/opdata/burt/allsnap/08-21-26_09:54:52
Restored file: /tmp/08-24-26_14:49:21.snap

Log Number: 4544467Logbook(s): 

• POLOG
• ELOG

Entry Makers: brukerBody: 

Running laser-stage grid-scan code: 11000...14000 in x, 16500...19500 in y, 16x16 grid.
The active area is larger than this, but past this rectangle, the gun field deflects the beam too strongly for the second BPM to work.

Figure 1: positions and angles.
Figure 2: extrapolated rays and focal length vs laser-spot position. The stage coordinate is in mm based on the calibration done earlier, though whether this agrees 100% with the size of the exposed photocathode surface in stage units is unclear.

Log Number: 4544466Logbook(s): 

• ELOG

Body: 

No expected impact to ops. Approved by ruber as well.

Log Number: 4544465Logbook(s): 

• ELOG

Body: 

No expected impact to ops. Approved by ruber as well.

Log Number: 4544464Logbook(s): 

• ELOG
• LERFLOG

Tags: 

• Readme

Body: [figure:1] Always check the Authorization web application for the latest status: JLab Authorization Manager

Log Number: 4544463Logbook(s): 

• ELOG
• LERFLOG

Body: The following entry was removed from the Accelerator Bypassed-Interlocks Log (ABIL) Tag # 9993 Device: LCLS2 CM tuner 2 limit switch Function: Prevent futher stepper motor tuner motion Location: LCLS2 cav 2 DB-9 breakout near Resonance Control chassis Purpose: Bypass malfunctioning 0320-LIM B switch to allow tuni

Log Number: 4544462Logbook(s): 

• ELOG
• SRFPLASMA

Body: 

Moved DecaRads from 2L05, 2L23 & 2L24 to 2L22, 2L25 & 2L26.
Control and readbacks are via normal paths for C100 DecaRads, 2M, 2P & 2Q.
All 10 chs. on all 3 systems read normal background counts after installation and are ready for FE testing.
Note that the readbacks for the bias on 2L23 & 2L24 (2N & 2O) are not valid, since the hardware has since been moved out of those 2 zones.
The system on 2L03 (via SRF DecaRad screen sl05a, DRADS05ASRF...) remains in place, just in case 2L03 becomes functional, except for ch.3 (WG 3&4) which was poached to get 2L22 ch.4 working.

Log Number: 4544459Logbook(s): 

• ELOG
• RFLOG

Entry Makers: kpriceBody: 

Log Number: 4544458Logbook(s): 

• ELOG

Entry Makers: kpriceBody: 

Log Number: 4544457Logbook(s): 

• POLOG
• ELOG

Entry Makers: brukerBody: 

Using the spiricon camera, I recorded the laser-spot position as a function of x/y coordinate for calibration of the gun optics data.

x,y,spot_x,spot_y
13400,18900,4.790,3.381
12900,18900,3.998,3.396
12400,18900,3.209,3.376
12400,18400,3.177,2.578
12400,17900,3.190,1.795

The last two columns are the centroid position in mm as reported by BeamGage.
Assuming the distance to the camera is correct, the calibration is 1.6 mm per 1000 units in both axes.

After the measurement, I put the laser beam stopper back to where I had found it, protecting the camera.