Aggregator

Log Number: 4477707Logbook(s): 

• CLOG
• ELOG

Body: 

During the CEBAF maintenance day the NE Transferline Insulating Vacuum (CTLis 115630) was pumped. The graphs show a reduction in CHL2_2K Cold Box inlet temperature and a reduction in the speed of Cold Compressor 4. The majority of 81kW in electrical power reduction is likely due to the improved vacuum. A minority of the power reduction is due to an oil injection adjustment of the main compressors to improve efficiency.

Log Number: 4477706Logbook(s): 

• ELOG
• INCLOG

Body: 

Control chassis removed for repair/refurbishment.

Fast valve disabled mechanically in open position.

Reminder: All Fast Valve status permits bypassed in FSD.

WARNING
There is no position monitor for the fast valve while the chassis is removed.

Log Number: 4477705Logbook(s): 

• ELOG

Body: 

2L10-8 Replaced the filament bd for filament volts high fault and still had same problem. Swapped cav. 7 with cav. 8 filament bds. and filaments still tripped with fil. volts high fault. Checked the back of HPA cabinet as well as all the connectors inside out and found no damage. Disconnected filament leads off interconnect board and measured cold filaments at .8 ohm which Sam says should be ok (normally ~2 ohms or less cold) . Had to re-bypass cavity 8, still stepped off, to bring the rest of the zone back into RF. More T/S next maintenance day.

Log Number: 4477703Logbook(s): 

• ELOG
• RFLOG

Entry Makers: alexsBody: 

When restoring RF in the South Linac after the maintenance day, 2L11 was found to have lost its waveguide pressure permissive. We checked locally and found it had dipped just below the trip point, suggesting a small, slow air leak somewhere in the HPA air lines. The regulator was adjusted to get it back above the trip point, and hopedully it will hold until it can be addressed on the next maintenance day. If not, a PTW and IC have been prepared in advance for troubleshooting.

Log Number: 4477702Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Schaumloffel
DATE:             03/17/2026
SHIFT:               Swing

The operator has read the following:

Log Number: 4477699Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Yoon
DATE:             03/17/2026
SHIFT:               Swing

The operator has read the following:

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

Log Number: 4477698Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Thomas
DATE:             03/17/2026
SHIFT:               Swing

The operator has read the following:

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

Log Number: 4477695Logbook(s): 

• ELOG
• RFLOG

Body: 

1L09
Inspected both the CPS and HPA cabinets, did find a loose connection on the Mod Anode Load resistor which we re-terminated. Outside of that there weren't any signs of major issues. Also, replaced the broken fuse on the SCR controller (not the issue just utilized the opportunity).

Techs: Evonda V. and Sam H.

Log Number: 4477694Logbook(s): 

• ELOG

Entry Makers: kernsBody: 

Put in new filament board and same Filament Volts High fault. Rechecked all connectors front and back and then swapped cav. 7 and cav. 8 filament boards and again had Fil. Volts High fault trip zone out of filaments with filaments going high to ~5.5 volts before ramp hit 10 seconds. Measured disconnected filaments after consulting with Sam for what they should read cold ~ 2 ohms or less. The filaments read .8 ohms which should be OK. Re-bypassed cavity 8 until further troubleshooting can take place. South locked up and in power permit so RF recovered in the rest of the zone.

Log Number: 4477693Logbook(s): 

• ELOG

Entry Makers: eformanBody: 

Looks like the noisy readback has been fixed. Dropped mismatch alarm limit back to its operational value of 0.01 A.

Log Number: 4477691Logbook(s): 

• ELOG

Body: ACC=>TRIMS=>E101B08=>MQK7S10 has been enabled in alarm handler

DC Power investigated. Enabling alarm

Log Number: 4477690Logbook(s): 

• ELOG

Body: 

Identified and documented penetration numbers for BLM cable routing in North and South Linac areas. S.Bruhwel, L.Krylach, L.Leung

Log Number: 4477689Logbook(s): 

• ELOG

Body: 

Set up DecaRad system on 2L05 to support post-plasma checks.
Readbacks via SRF DecaRad sl05a
__Drad Ch.__ /__Location__
DRADS05ASRF1 2L05 WG 1&2
DRADS05ASRF2 n/c
DRADS05ASRF3 2L05 WG 3&4
DRADS05ASRF4 n/c
DRADS05ASRF5 2L05 top cl
DRADS05ASRF6 2L05 WG 5&6
DRADS05ASRF7 2L05 WG 7&8
DRADS05BSRF8** 2L05 Return (DS) BL**
DRADS05ASRF9 2L05 Supply (US) BL
DRADS05ASRF10** N/C (bad ch)**
DRADS05AHVMON
All 7 chs. are good. HV bias is off.
***** ******
Set up DecaRad system on 2L22 to support post-plasma checks.

Log Number: 4477688Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

The following cavity histories have been updated:
2L10-8
Username: kerns
Date/Time: 03-17-26_15:38:42
RF Status: Bad
Tuner Status: Good
Comment: Unbypassed to install two filaments boards with same Ful. Volts High. Measured filaments cold at .8 ohms. Needs new klystron.
Special Instructions:

Maintenance Tag: Component: Tube

Log Number: 4477687Logbook(s): 

• ELOG
• SRFLOG

Body: 

Maintenance Day
- Moved cleanrooms to stubs
- Cleaned and tidied up, tied up various loose ends

Log Number: 4477686Logbook(s): 

• ELOG
• SLOG

Tags: 

• Autolog

Body: restorelib 3.0.1 Target restore date was 2026-03-17 15:29:42 The output from the myRestore execution was as follows: iocsoftw3spce systemEnum@2026-03-17 15:29 2(2) restored Execute: /usr/csite/certified/bin/ced2Epics -ced ced -A -i iocsoftw3spce (success) PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 PVs modified: 0 Procedure return status: Success

Log Number: 4477684Logbook(s): 

• ELOG
• LERFLOG

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

Date : 03-17-26
Time : 15:18:19
Day : Tuesday
Shift : Swing

Crew Chief : Forman
Program Deputy: Roblin
Team : F
Arm : Yoon
Designated SSO: Schaumloffel
Operators : Schaumloffel, Yoon

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

Log Number: 4477681Logbook(s): 

• ELOG
• INCLOG

Body: 

Update:

Scope recorded a phantom "trigger" event that was immediately preceded by what looks like a ground bounce on the 15V rail.

Using a multimeter, I measured 10 ohms between the ground reference pin on the control card and the rack rails which are bonded to the MGC.

Plan to pull the control chassis for repair.

Log Number: 4477680Logbook(s): 

• ELOG

Entry Makers: bjacobBody: 

Was a little grumpy waking up from the maintenance day.

Log Number: 4477678Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: RF was turned on in:
R26
R27
R28
R29
R2C
R2J