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CREW CHIEF SIGN IN

2 hours 50 minutes ago
Log Number: 4487654Logbook(s): Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 04-15-26
Time : 07:33:33
Day : Wednesday
Shift : Day

Crew Chief : Humphry
Program Deputy: Ogur
Team : E
Arm : RadCon
Designated SSO: Blackshaw
LERF Operator:
Operators : Blackshaw, Janak

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

injector skew quads

3 hours 28 minutes ago
Log Number: 4487642Logbook(s): Tags: Entry Makers: beneschBody: 

with 0L03-4 off, MQS0L04 should be reduced to 15.74 if you don't run lemi.

Based on my experience, the odds that you'll have to rematch the injector to North Linac after removing the early RF focusing are at least even.

benesch

MBF0L06 set to 4D spectrometer

3 hours 50 minutes ago
Log Number: 4487638Logbook(s): Entry Makers: kpriceBody: 

Once we get 0L03 back, we'll need to phase 0L04-7 before attempting to recover beam into the main machine. Injector on-call recommended setting up to the 4D as the most straightforward way to phase this cavity.

kprice

UnBypass 0L04-7 to make up for loss of 0L03-4

3 hours 50 minutes ago
Log Number: 4487637Logbook(s): Entry Makers: dchriBody: 

Zone tripped HV while UnBypassing 0L04-7. However, was able to get 0L04-7 on and have it currently sitting at 5MV/m (GDR) with HV restored

As for 0L03, seems like even after bypassing 0L03-4 the zone is still not going into HV. So perhaps efforts to bring up 0L04-7 were in vain?

Letting 0L04 sit with cav 7 on for now. However, will likely Bypass it if 0L03 HV and cav 4 comes back

dchri

Downtime Incident CLOSED: 0L03 Dropped HV

4 hours 16 minutes ago
Log Number: 4487629Logbook(s): Body: IDDescriptionPeriodCause 16728Title:
0L03 Dropped HV

Summary:
Zone dropped on HPA overload; now cavity 4 KMAI appears to be preventing zone from recovering into HV. Contacted RF on call; they are working to diagnose. Edit: SME could not recover cavity.
victorc

The following cavities have been bypassed: 0L03-4

4 hours 18 minutes ago
Log Number: 4487627Logbook(s): Tags: Body: 

The following cavities have been bypassed:
0L03-4
Username: kprice
Date/Time: 04-15-26_06:06:09
RF Status: Bad
Tuner Status: Good
Comment: Bypassed - stepped off +100k - Klystron, KMAI preventing zone from recovering into HV
Special Instructions:

Maintenance Tag: Component: Operator Entry - See SME

kprice

QE Measurement

4 hours 46 minutes ago
Log Number: 4487620Logbook(s): Body: Spot Location: (13250,19250), Charge: 12.508439999999995

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

Shift Information

Shift Day
CEBAF Program
MCC Crew Chief Humphry
MCC Operators Blackshaw, Janak
Program Deputy Ogur
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