Aggregator

Log Number: 4502229Logbook(s): 

• DCLOG
• ELOG

Entry Makers: msmithBody: 

Log Number: 4502225Logbook(s): 

• ELOG

Entry Makers: samariBody: 

Bringing it back on crest fixed everything. The reason for the change was stated in the linked log, but I think the dpp setpoint was put at a bad spot after the hand tweaks were done.

Log Number: 4502224Logbook(s): 

• BTLOG
• ELOG

Entry Makers: kirstendBody: 

A rough timeline: injector work to resolve charging/discharging ( https://ace.jlab.org/dtm/incidents/16963 ), xB had concerns about halo rates ( https://ace.jlab.org/dtm/incidents/16964 ), and wanted to check the optics after the halo rates were resolved.

Log Number: 4502223Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Allowed us to ramp up to 600 nA.

Paused the OpsPID43 lock during this and updated the setpoint when I was done.

Log Number: 4502222Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 16966Title:
xB Optics Troubleshooting

Summary:
Troubleshooting fixing the tail on the beam as seen in their harp scans. First attempted quad adjustments to no avail.

Log Number: 4502220Logbook(s): 

• ELOG

Entry Makers: deirBody: 

Current lock is overshooting a bit. May need to home attenuator. 580 in the lock is getting us 600 on the 2C21 BPM.

Log Number: 4502219Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Smith
DATE:             05/21/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4502218Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Samari
DATE:             05/21/2026
SHIFT:               Owl

The operator has read the following:

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

Log Number: 4502217Logbook(s): 

• ELOG

Entry Makers: deir

Log Number: 4502216Logbook(s): 

• BTLOG
• ELOG

Entry Makers: kirstendBody: 

Fig. 1 is during production, Fig. 2 is near the start of the halo investigation, now with the upstream rates included.

Log Number: 4502214Logbook(s): 

• ELOG

Entry Makers: deir

Log Number: 4502209Logbook(s): 

• ELOG
• RFLOG

Entry Makers: dturnerBody: smartRAT V3-4 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 2026-05-13-2026-05-20"


Data directory: /cs/prohome/apps/s/smartRAT2/3-4/fileio/pca_data/output_cavityOutDet/calibrated_cavitylevel_centralize_tsfresh_minimal_gmespmes/whole/rcntnp/2026-05-13-2026-05-20/PCA/

Log Number: 4502203Logbook(s): 

• HDLOG
• ELOG

Entry Makers: anthonyBody: 

Log Number: 4502201Logbook(s): 

• ELOG

Entry Makers: anthonyBody: 

Log Number: 4502200Logbook(s): 

• ELOG

Body: Calibration ParametersHall:DTarget: JD70-107 55um 45/135 degPass: 5.5Note: Calibrated On:2026-May-03 18:47Calibrated By: alexsFile:D-2026-05-03_1847_JD70-107_55um_45_135_deg_Pass-5.5.hcdIon ChamberExisting Setpoing (rads/hr)New Setpoint (rads/hr)

Log Number: 4502199Logbook(s): 

• HBLOG
• ELOG

Entry Makers: shrinerBody: 

Log Number: 4502197Logbook(s): 

• BTLOG
• ELOG

Entry Makers: kirstendBody: 

After asking some clarifying questions regarding the xB halo investigation downtime ( https://ace.jlab.org/dtm/incidents/16964 ), it seems that after the injector work, xB requested 20 nA and found the halo rates at the midstream counters unacceptable, since they thought the values were incompatible with the rates they had been enjoying at 600 nA. However, comparing the current/rates which sparked this investigation (Fig. 1) with the current/rates during ramp up after a trip during production running yesterday (Fig.

Log Number: 4502196Logbook(s): 

• ELOG
• LERFLOG

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

Date : 05-20-26
Time : 23:41:38
Day : Wednesday
Shift : Owl

Crew Chief : Deir
Program Deputy: Drury
Team : A
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: 4502191Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: CW to xBCD

Log Number: 4502190Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

Body:  Accelerator PHYSICS STUDIES RESTORE ACC DOWN OFF (SAM) Planned 8 0 0