Aggregator
Injector Alarm Limits Set
QuickPic - FE Onset for 1L09 Cavity 8
The following cavity histories have been updated: 1L23-6
The following cavity histories have been updated:
1L23-6
Username: deir
Date/Time: 02-12-26_00:58:57
RF Status: Bad
Tuner Status: Good
Comment: C100 Bypassed - ModAnode High dropping zone HV
Special Instructions: ODVH from SRF commissioning are suggested. optimize LLRF, then push RF
Maintenance Tag: Component: Operator Entry - See SME
COMMENT ON Post SAM FE onset measurements C75 and C100 cryomodules
Operator SIGN IN
QuickPic - Field Emission measurement for 1L09 Cavity 7
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 02-11-26
Time : 23:24:36
Day : Wednesday
Shift : Owl
Crew Chief : Deir
Program Deputy: Buttles
Team : A
Arm : RADCON
Designated SSO: Smith
LERF Operator:
Operators : Smith
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
QuickPic - Field Emission measurement for 1L09 Cavity 6
Punting on Low Energy ILD Setup
Started swing shift by attempting to improve optics with low energy to the ILD. IHA0L03 was well matched between the Wien configuration for high and low energy setups, and viewer walks were fairly close up to the mid-0L, so we decided to attempt to match with IHA0L08. The first IHA0L08 scan was abysmal, with an X sigma of ~1.8 mm, and the X-plane emittance measurement showed a beta of ~2.5 km which made for a /very/ aggressive match, so a little bit of pre-match tweaking was in order.
QuickPic - Field Emission Measurement 1L09 Cavity 5
IHA0L08 Slipping on Retraction?
Attempting to take y-plane match data and the harp zigs but doesn't zag. One can see from the most recent scan in figure 7 that the "potScaled" axis is miniscule. When the harp is zeroed after the scan the potentiometer readback returns to the expected value but the servo motor position readback reaches something like -300 or -400 mm before getting set to zero, presumably when the harp hits a limit switch. Compare the behavior of IHA0L03 (Fig. 8) to IHA0L08 (Fig. 9).










