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Follow-up Re: 2L25-1 & 8 Cold IR sensors responding backwards

1 day 20 hours ago
Log Number: 4513276Logbook(s): Body: 

these were responding the right way last run. None of the cables or chassis were replaced during the SAM other than the cryomodule. For these two cavities, it is as if we are running with no interlock on the window temperature. Set point for the trip is positive and the readback is negative. This will never trip even if it exceeds -4V

bachiman

Operator SIGN IN

1 day 21 hours ago
Log Number: 4513244Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Barker
DATE:             06/18/2026
SHIFT:               Day

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

Operator SIGN IN

1 day 21 hours ago
Log Number: 4513243Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Thomas
DATE:             06/18/2026
SHIFT:               Day

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

put dump IC tolerance thresholds more conservative

1 day 21 hours ago
Log Number: 4513242Logbook(s): Entry Makers: samariBody: 

Lowered to 50 and 65% respectively and got nuissance diffuser trips even without the ion chamber current dropping anywhere near the dynamic threshold (see fig 1). I bumped both up 15%, to 65 and 80 % for IC 1 and 2 respectively. I then lowered threshold for IC 1, which doesn't trip all the way down to 20% (fig 2). The behavior seemts to point to something being odd with IC 2? Final settings in fig 3

samari

COMMENT ON Inspect and/or Replace ML DAQ chasssis in NL

1 day 22 hours ago
Log Number: 4513233Logbook(s): Body: 

On the next maintance day, I would like to work with this chassis one more time before closing out this ATLiS / Epass.

Since we had to remove the attenuator boards, the signal read back levels are clipping. I think that I have a solve for this, but it involves swapping out the internal ADC boards with a modified version. I am working with the fab shop to do these changes on some spare boards. My plan would be to perform the board swap in situ (with chassis power off of course) and see if this takes care of the clipping.

latshaw

CREW CHIEF SIGN IN

1 day 22 hours ago
Log Number: 4513228Logbook(s): Body: 
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM

Date : 06-18-26
Time : 07:22:04
Day : Thursday
Shift : Day

Crew Chief : Schoene
Program Deputy: Nissen
Team : B
Arm : Thomas
Designated SSO: Barker
LERF Operator:
Operators : Barker, Thomas

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

Got in touch with FML at Hall C's Request

1 day 22 hours ago
Log Number: 4513214Logbook(s): Entry Makers: deirBody: 

The temps in their electronics room is becoming too hot and they are worried they will not be able to operate under those conditions.

Just spoke with FML, they are looking at it remotely and will then send someone out to investigate.

deir

1L07-1 FCC seems to have gone wacky

1 day 23 hours ago
Log Number: 4513205Logbook(s): Entry Makers: deirBody: 

Cavity tripped out on detune angle according to the waveform browser. Sitting in SEL the TDETA is highly unstable and trying to transition into SELA/SELAP would cause the tuner to tune the cavity off resonance.

Took a look at CRFPPmin and CRFPPmax, looks like they're both maxed at 180. If this is just oscillating then I don't think it's any surprise that the TDETA is showing the same behavior.

We've bypassed it for now.

deir

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CEBAF Program
MCC Crew Chief Price
MCC Operators Howard, Chaudhary, Christian
Program Deputy Nissen
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