Aggregator

Log Number: 4474964Logbook(s): 

• POLOG
• ELOG

Entry Makers: mamunchgarciasuleimangramesbrukerBody: 

After swapping the damaged Gun HVPS cable with a spare one this morning, we started ramping up the gun and set the new HV limit at 140 kV.

Plan for today's ramp rate at different HV ranges are as follows:

0-25 kV (at 5 kV/min rate), wait few minutes
0-50 kV (at 5 kV/min rate), wait few minutes
0-75 kV (at 2.5 kV/min rate), wait few minutes
0-100 kV (at 2.5 kV/min rate), wait few minutes
0-125 kV (at 1 kV/min rate), wait few minutes
0-140 kV (at 1 kV/min rate), wait few minutes

Hand it over to ops to soak the gun at 140 kV for the weekend.

Log Number: 4474963Logbook(s): 

• ELOG

Entry Makers: mockBody: 

For HV Gun testing after replacing HVPS cable.

Log Number: 4474962Logbook(s): 

• POLOG
• ELOG

Tags: 

• Readme

Entry Makers: gramesBody: 

We're recovering from a failure of the gun HVPS cable to vacuum chamber ceramic. Repair and restore working is going well so far. For the remainder of the weekend we'll be only be applying lower voltage to the gun. Hopefully our weekend tests will help us have a path forward by Monday day shift.

In the meantime...

...please do not initiate any gun HV ramps and work with CIS for any changes to the gun high voltage controls. We'll leave further instructions, but wanted to get this message in the logbook.

Log Number: 4474961Logbook(s): 

• POLOG
• ELOG

Entry Makers: gramesBody: 

The damaged high voltage cable from HVPS to gun (350 to R30) has been tagged and staged for rad survey at the bottom of the INJ stairwell. Not urgent, when convenient.

A photo of the damaged R30 plug end with the securing fixture flange removed is shown in Fig. 1.

Log Number: 4474960Logbook(s): 

• ELOG
• POLOG

Body: 

Applied jumper to J6 input on gun HVPS interface chassis. ABIL #9449 is made.

For details of adding jumper see - https://logbooks.jlab.org/entry/4474959

Log Number: 4474959Logbook(s): 

• POLOG
• ELOG

Entry Makers: gramesBody: 

Applied a jumper to the gun HVPS J6 input to clear the global/vac interlock.

Fig. 1 shows the rear of the 1U chassis in IN01B02 with jumper installed and usual interlock cable disconnected in-hand.

Fig. 2 shows the face of the 1U chassis prior to applying the jumper (Global Interlock = faulted = unlit)

Fig. 3 shows the same now with J6 jumper added (Global Interlock = okay = lit)

Log Number: 4474958Logbook(s): 

• ELOG

Body: The following entry was placed in the Accelerator Bypassed-Interlocks Log (ABIL) Device: HVPS MPS interlock (valve, dipole, SF6) Function: MPS enable inputs for gun high voltage power supply Location: IN01B02 Purpose: Apply high voltage to gun HVPS chamber with gun vavle closed Exp.

Log Number: 4474957Logbook(s): 

• ELOG

Body: 

Looks good to me. Approved.

Log Number: 4474954Logbook(s): 

• ELOG

Entry Makers: dthomasBody: 

Log Number: 4474953Logbook(s): 

• ELOG

Entry Makers: dthomasBody: 

Log Number: 4474952Logbook(s): 

• ELOG

Entry Makers: mockBody: 

For all magnets up to xBCD dumplettes.

I went through and double checked that all Box supplies and Quads are set to design values. There were a handful of quads set to zero but have now been set (made sure we were good to go in SRM first).

The only magnets not set to design are:

MXM3S03 shunt (see linked Ops PR). Design is setting current over limit.
MARC7A shunts as the box supply is turned off due to YBBS06 issues.

Log Number: 4474951Logbook(s): 

• ELOG

Entry Makers: mockBody: 

Noticed this shunt 3.67% off design in eDT.
When setting to design setpoint, the control system is requesting 9.057 Amps but shunt throws a current limited alarm and limited to 5.266 Amps.
Put setpoint back where it was to not stress/damage shunt module.

Not sure if eDT is incorrect or the current limiting setpoint is incorrect.

Log Number: 4474950Logbook(s): 

• POLOG
• ELOG

Entry Makers: suleimanBody: These are the settings for different Gun HVs: Wien Settings for different Gun HV Gun HV (kV) Angle (degrees) Wien Voltage (V) Magnet Current (A) 200 90 18038.6 14.63 200 60 12025.7 9.75 140 90 12007.8 10.93 140 100

Log Number: 4474949Logbook(s): 

• ELOG

Body: ACC=>RF=>NORTH_LINAC=>1L02=>R12XMOTEMP has been disabled in alarm handler

Ops PR:
https://logbooks.jlab.org/entry/4474927

Log Number: 4474948Logbook(s): 

• ELOG

Entry Makers: mockBody: 

Hall A - Unable to set to inactive without eDT throwing an error (see linked log). Setting back to 5th pass for now.
Hall B - 5th Pass
Hall C - 2nd Pass
Hall D - 5.5th Pass

Based on latest Experimental schedule.

Log Number: 4474947Logbook(s): 

• ELOG

Entry Makers: mockBody: 

See figure 1 for the error thrown when Hall A is set to inactive in MSS.
Leaving Hall A as Pass 5 for now.

Log Number: 4474946Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Barker
DATE:             03/07/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4474945Logbook(s): 

• ELOG
• LERFLOG

Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Thomas
DATE:             03/07/2026
SHIFT:               Day

The operator has read the following:

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

Log Number: 4474943Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: Ran from opsl02

Finished after 56 iterations.

GREY: RF OFF
RATNI RED: <= 3.0 dB
GASKL RED: <1.8 V or > 2.4 V

Log Number: 4474942Logbook(s): 

• ELOG

Entry Makers: mockBody: 

Turned off for the Wednesday maintenance day. Been off since; turned them back on.