Aggregator

Log Number: 4485887Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 16696Title:
2L04-6 HV drop

Summary:
Cavity 6 brought the zone down on Filament Volts Low.

Log Number: 4485883Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavities have been bypassed:
2L04-6
Username: samari
Date/Time: 04-10-26_03:15:51
RF Status: Bad
Tuner Status: Good
Comment: Bypassed - stepped off +100k - fil volts low
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

Log Number: 4485884Logbook(s): 

• ELOG

Entry Makers: samariBody: 

Tried bringing it back up but no dice, bypassing the cavity

Log Number: 4485868Logbook(s): 

• HCLOG
• ELOG

Entry Makers: msmithBody: 

Log Number: 4485867Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: UNMasked Hall C Normal Target FSD

Log Number: 4485865Logbook(s): 

• ELOG

Body: Calibration ParametersHall:CTarget: 4cm DummyPass: 2Note: SHMS angle -17.34,current -422.3Calibrated On:2026-Mar-30 23:40Calibrated By: yoonFile:C-2026-03-30_2340_4cm_Dummy_Pass-2.hcdIon ChamberExisting Setpoing (rads/hr)New Setpoint (rads/hr)

Log Number: 4485864Logbook(s): 

• HCLOG
• ELOG

Entry Makers: msmithBody: 

Log Number: 4485863Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: Masked Hall C Normal Target FSD

Log Number: 4485859Logbook(s): 

• BTLOG
• ELOG

Entry Makers: samariBody: 

The double peak frequency of oscillation at is very consistent in fig 1 at 1E01, the first single pass SEE BPM past the NL. The injector SEE BPM's sample rate is a little bit to high to see 60 Hz, So I can't differentiate between north linac and injector as the source. at 4E01, the 60 Hz vertical oscillation amplitude grows to a whopping 1.5 mm (fig 2).

Log Number: 4485856Logbook(s): 

• ELOG

Entry Makers: kpriceBody: 

Zeroed the detune angle for this one. Didn't cure the flickery GMES, but brought CRFP down from ~2.5 to ~2.1, and GASK down from ~2.6 to 2.4.

Log Number: 4485850Logbook(s): 

• ELOG

Entry Makers: kpriceBody: 

Log Number: 4485849Logbook(s): 

• ELOG

Entry Makers: kpriceBody: 

Didn't need to zero the detune angle, it looks like maybe I just put the tuner in a better spot. No change to CRFP; GASK is lower and quieter and GMES isn't flickering anymore.

Log Number: 4485846Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Samari
DATE:             04/10/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4485844Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Smith
DATE:             04/09/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4485842Logbook(s): 

• ELOG

Entry Makers: alexsBody: 

So far, the indicator most correlated with drifts in the north linac gang phase has been the Zone 1 temperature in the service building (Figure 1. Second chart with negative zone temperature to better show correlation). I took a walk out to visually inspect that area (Figure 2), and found that the MO line behind 1L02 has a lot of insulation peeled off with a decent chunk of the MO exposed (Figures 3-5) compared to the same area in the south linac (figure 6). Bundling this section back up might not be a bad idea.

Log Number: 4485835Logbook(s): 

• ELOG
• RFLOG

Entry Makers: dturnerBody: smartRAT V3-3 on opsrfdaqnl1

To view waveforms from a timestamp:

ssh opsrfdaqnl1 "smartRAT -m DAQ -d /data/fast_daq/<timestamp>"


To view waveforms of the top 25 from this report:

ssh opsrfdaqnl1 "smartRAT_view_daily_top25 2026-04-02-2026-04-09"


Data directory: /cs/prohome/apps/s/smartRAT2/3-3/fileio/pca_data/output_cavityOutDet/calibrated_cavitylevel_centralize_tsfresh_minimal_gmespmes/whole/rcntnp/2026-04-02-2026-04-09/PCA/

Log Number: 4485832Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Figs 1&2: Comparison of main machine harp velocities vs. Hall C. Additionally, the 3C07A/B, 3C12A/B, and 3C17A/B harps all have x,y,x wires.

On the 3C07A/B harps, there's not a lot of motion on either the x or y wires for these swipes. Judging by the Hall C Steer Up screen and the BPM screen, this is not a particularly dispersive region.

On the 3C12A/B harps, interestingly enough, there's almost no motion on the y wires but the x wires show heavy beam jitter.

Log Number: 4485830Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632

Saved: kprice 04-09-26 23:25:06 {A:i B:5 C:2 E:345 A=BS B=BS C=CW D=BS 0R08=15.09 No dumps in.

Log Number: 4485829Logbook(s): 

• ELOG
• LERFLOG

Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 04-09-26
Time : 23:19:21
Day : Thursday
Shift : Owl

Crew Chief : Price
Program Deputy: Ogur
Team : D
Arm : Samari
Designated SSO: Smith
LERF Operator:
Operators : Samari, Smith

This stamp certifies that the above Crew Chief has read/reviewed/received the following:

Log Number: 4485828Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: 15uA CW to Hall C.