Aggregator

Log Number: 4482328Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: saver ran from opsl632

Saved: jhoward 03-31-26 23:23:50 {A:i B:5 C:2 E:345 A=BS B=BS C=CW D=BS 0R08=11.94 No dumps in.

Log Number: 4482327Logbook(s): 

• ELOG
• LERFLOG

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

Date : 03-31-26
Time : 23:18:29
Day : Tuesday
Shift : Owl

Crew Chief : Howard
Program Deputy: Malace
Team : D
Arm : Chaudhary
Designated SSO: Price
LERF Operator:
Operators : Price, Chaudhary

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

Log Number: 4482324Logbook(s): 

• ELOG

Tags: 

• ShiftSummary

Body:  CEBAF SHIFT LOG Shift Summary

Start of shift: CW beam to Hall C

Log Number: 4482321Logbook(s): 

• ELOG

Tags: 

• BeamAccounting

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

Log Number: 4482317Logbook(s): 

• HCLOG
• ELOG

Entry Makers: yoonBody: 

on loop 3

Log Number: 4482316Logbook(s): 

• HCLOG
• ELOG

Entry Makers: yoonBody: 

on loop 3

Log Number: 4482313Logbook(s): 

• BTLOG
• ELOG
• RFLOG

Entry Makers: dturnerBody: 

Attached are several examples of potential culprits. Note the GMES (second trace from the top) drops at the same time the linac current (first trace) drops upon a trip.

JMenu->RF Apps->smartRAT->smartRAT (MYA)

Log Number: 4482310Logbook(s): 

• ELOG
• RFLOG

Entry Makers: deirBody: 

Noticeable GMES noise with higher linac currents. Would recommend stepping off another +10k steps. The signed steps will need to be cleared first. Click the '1' button on the row showing '+/- 20000.01'.

Log Number: 4482306Logbook(s): 

• HCLOG
• ELOG

Entry Makers: yoonBody: 

on loop 3

Log Number: 4482303Logbook(s): 

• BTLOG
• ELOG
• RFLOG

Entry Makers: dturnerBody: 

Fig 1 has several cavities in 2L25 that have GMES correlated with linac current. The GMES rise for a couple of those cavities is near our accepted 0.1MV/m limit when Hall C was taking 40uA.

Fig 2 shows correlation between R1N1GMES and linac current. The GMES rise is small, but clearly non-zero with Hall C taking 40uA.

Perhaps it wouldn't hurt to step these cavities off a bit more.

Log Number: 4482299Logbook(s): 

• HCLOG
• ELOG

Entry Makers: yoonBody: 

on loop 3

Log Number: 4482298Logbook(s): 

• HCLOG
• ELOG

Tags: 

• Hall C

Body: 

Worked with Ben to take open/closed loop data. BPMs used are: 3C08-X, 3C16-X; 3C07-Y, 3C16-Y. Correctors used are: 4H, 7H and 2V, 7V. Feedback update rate standard operations 1.8 kHz (harmonic 30). BPM frequency domain plots of beam attenuation at BPMs shown. Many are railed and likely the IOC stopped serving these (seen this issue before) waveforms. One does see in some the characteristic DC, 60, 120 and 180 Hz notches where the feedback system has large gain. FF was turned off as it was railing correctors.

Log Number: 4482297Logbook(s): 

• ELOG

Entry Makers: deirBody: 

There was a question about whether this energy drift was a "fixed" energy drift between this run and last run. In an attempt to rule that out, I decided to collect some data on Ops' NL GP corrections from this run and the last run.

For the data from this run, I looked at March 18 at 00:00 until March 22 at 00:00.
For the data from the last run, I looked at May 7 at 00:00 until June 1 at 00:00.

Log Number: 4482295Logbook(s): 

• ELOG
• INCLOG

Body: 

Jumpers were installed on the controls for temporary disabled valves VBV2H00A, VBV2H01A and VFV2H01A to simulate open positions on those valves to satisfy the FSD permit on FSD Node 2H02, CH4. These valves show green on the control screen but are not truly open.
ABIL #9609,9610,9611

Log Number: 4482288Logbook(s): 

• HCLOG
• ELOG

Entry Makers: bschaumlBody: 

Had to steer up the hall line a tad before getting fast feedback up and running. Getting the selected horizontal BPMs at the entry and exit of the arc proved difficult so I did my best to equalize them around -0.5 mm. I tweaked the dipole string +700 G-cm to zero IPM3C12.XPOS. Vertical orbit wasn't too tough to tidy up at the selected FFB BPMs.

Positional feedback came up without trouble apart from feedforward which is still railing correctors even though I tried resetting it a few times and, on a lark, tried dropping the FF gain an order of magnitude, all to no avail.

Log Number: 4482282Logbook(s): 

• HCLOG
• ELOG

Entry Makers: yoonBody: 

on loop 3

Log Number: 4482280Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System UN-Masking for: BeamLossMonitor
User: bschauml
Areas: All

BeamLossMonitor Devices:
ILM0I07
ILM0L01A
ILM0L01B
ILM0L02
ILM2D00A
ILM2D00B
ILM0L04A
ILM0L04B
ILM0L05
ILM0L06A
ILM0L08
ILM0R01
ILM4D00
ILM0R03
ILM0R04
ILM0R06
ILM0R08
ILM0R09
ILM1L01
ILM1L02
ILM6R08
ILM3S00
ILM7S00
ILM9S00
ILM5S10
ILM5E03
ILM7S01
ILM9A01
ILM3E02
ILM5A01
ILM1A04
ILM1A06
ILM1A09
ILM5A10
ILM1A16
ILM1A19
ILM3R10
ILM9R07
ILM1R09
ILM2L03
ILM5R10
ILM5R05
ILM2L01
ILM2T09
IL

Log Number: 4482278Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: System Masking for: BeamLossMonitor
User: bschauml
Areas: All

BeamLossMonitor Devices:
ILM0I07
ILM0L01A
ILM0L01B
ILM0L02
ILM2D00A
ILM2D00B
ILM0L04A
ILM0L04B
ILM0L05
ILM0L06A
ILM0L08
ILM0R01
ILM4D00
ILM0R03
ILM0R04
ILM0R06
ILM0R08
ILM0R09
ILM1L01
ILM1L02
ILM6R08
ILM3S00
ILM7S00
ILM9S00
ILM5S10
ILM5E03
ILM7S01
ILM9A01
ILM3E02
ILM5A01
ILM1A04
ILM1A06
ILM1A09
ILM5A10
ILM1A16
ILM1A19
ILM3R10
ILM9R07
ILM1R09
ILM2L03
ILM5R10
ILM5R05
ILM2L01
ILM2T09
ILM8T

Log Number: 4482279Logbook(s): 

• HCLOG
• ELOG

Entry Makers: yoonBody: 

on Loop 3

Log Number: 4482275Logbook(s): 

• ELOG

Body: IDDescriptionPeriodCause 16594Title:
xC BNR - changing HV settings

Summary:
xC BNR - changing HV settings **CHANGED THEIR MIND** wanted CW back after a few minutesDuration:
2 minutes

Time Down:
31-Mar-202