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10 hours 51 minutes ago
Log Number: 4472363Logbook(s): Tags: Body: saver ran from opsl03

Saved: dthomas 02-21-26 10:45:17 {A:5 B:3 C:1 E:345 A=BS B=BS C=BS D=BS 0R08=0.00 0R08 dump in. Autosave prior to restore.
dthomas

Operator SIGN IN

13 hours 25 minutes ago
Log Number: 4472361Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Thomas
DATE:             02/21/2026
SHIFT:               Day

The operator has read the following:
  • ELOG
  • PD Shift Plan
  • Radiation Surveys for PSS Segments in Controlled Access
  • PSS Log
dthomas

CREW CHIEF SIGN IN

14 hours 20 minutes ago
Log Number: 4472358Logbook(s): Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 02-21-26
Time : 07:16:20
Day : Saturday
Shift : Day

Crew Chief : Humphry
Program Deputy: Buttles
Team : X
Arm : radCon
Designated SSO: Thomas
LERF Operator:
Operators : Thomas

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

COMMENT ON RF HCO & Gradient Ramp 2026

14 hours 41 minutes ago
deir

QE Measurement

14 hours 47 minutes ago
Log Number: 4472355Logbook(s): Body: Spot Location: (13250,19250), Charge: 2.4364470000000003

Laser Wavelength Atten Setting Laser Power Current HV PS Current QE PV Updated? Update Time/Reason Not Updated (nm) (W) (uA)</
msmith

2L14 Partially ramped up by Ops

14 hours 59 minutes ago
Log Number: 4472352Logbook(s): Entry Makers: deirBody: 

Only cavity 1 is at the ODVH.

Cavity 5 was marked Not Ready in SRM. Recovered at 4 MV/m and upgraded to Checked.

Cavity 3 started to SOS above 9.5 MV/m. Tried tuning it, did not help. RATN is currently sitting at 1. Reduced GSET to 9.0 MV/m.

Set LEM REQ Heat to 80W.

deir

2L08 Checked out by Ops

15 hours 40 minutes ago
Log Number: 4472349Logbook(s): Entry Makers: deirBody: 

On and soaking at 4 MV/m. Updating SRM.

Cav 8 had a recent RFCM swap. Attempted OLT but GMES and PMES became unstable with loops closed. Ops-PR'd.

deir

2L12 Ramped down by Ops**

16 hours 8 minutes ago
Log Number: 4472346Logbook(s): Entry Makers: deirBody: 

I mistakenly thought this zone had already gone through the initial HCO. After checking SRM, it has not. Reduced gradients to 4 MV/m per cavity and adjusted LEM Heat accordingly. Updating SRM.

Also noteworthy...I was able to recover Cav 1 without issue. RFCM was replaced on 2/17.

deir

2L15 Ramped up by Ops

16 hours 58 minutes ago
Log Number: 4472344Logbook(s): Entry Makers: deirBody: 

Currently soaking at ODVH's. Checked a hypothetical LEM for the calculated gradients and LEM REQ Heat values. LEM's calculation had the zone pushed to its ODVHs, so the LEM REQ Heat value was accurate.

Will adjust LEM Heat when the zone is dropped to Target GSets.

deir

2L16 ramped to ODVHs

17 hours 5 minutes ago
Log Number: 4472343Logbook(s): Entry Makers: msmithBody: 

Cav-4: I brought this up to the 8 MV/m ODVH value but noticed a KMAI warning. Lowered to 7 for now (Fig.3)
Cav-5: CWVF faults when over 7.5 MV/m (Fig.4). Leaving at 6.5 for now

msmith

2L10 Ramped up by Ops

18 hours 38 minutes ago
Log Number: 4472341Logbook(s): Entry Makers: deirBody: 

Letting zone sit at ODVH for the rest of the shift. Compared current GSETs to a hypothetical LEM. LEM wants to set them a bit lower than the ODVH with a 42 W LEM REQ RF Heat. For the time being I have set LEM REQ RF Heat to 50W.

The archiver value is unreliable as we had all but cavity 3 online at the end of the last run. Currently half the zone is bypassed.

deir

Shift Information

Shift Swing
CEBAF Program
MCC Crew Chief Richardson
MCC Operators Chaudhary, Samari
Program Deputy Buttles
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