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Log Number: 4485680Logbook(s): 

• ELOG

Body: 

Cards have been swapped for the previously mentioned magnets in NL27B19.

Beam instability remains...

Log Number: 4485679Logbook(s): 

• ELOG

Body: 

Comments:

Still shaky at 4E01 it seems.

Laser Used:

C Laser

Sigmas:

Peak 1 - x Sigma: 0.2134 Peak 2 - u Sigma: 0.2712 Peak 3 - y Sigma: 0.5691

Log Number: 4485678Logbook(s): 

• HCLOG
• ELOG

Entry Makers: dthomasBody: 

Log Number: 4485677Logbook(s): 

• ELOG

Body: Calibration ParametersHall:CTarget: Loop 3 4cmPass: 2Note: SHMS angle -10.67,current -396.1Calibrated On:2026-Mar-31 17:58Calibrated By: yoonFile:C-2026-03-31_1758_Loop_3_4cm_Pass-2.hcdIon ChamberExisting Setpoing (rads/hr)New Setpoint (rads/hr)

Log Number: 4485675Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: 

Log Number: 4485674Logbook(s): 

• ELOG

Body: Faster Raster Mask State: (MASKED) Fast Raster is initialized for 1.41893 GeV Max current is 60 uA Raster was last initialized on 09APR26 13:47:56
Hall C Raster has been set to width = 2.0 by height = 2.0 Coil Pairs is 1

Log Number: 4485673Logbook(s): 

• ELOG

Tags: 

• Autolog

Body: Masked Hall C Normal Target FSD

Log Number: 4485669Logbook(s): 

• ELOG
• HCLOG

Body: 

Laser Used:

C Laser

Sigmas:

Peak 1 - u Sigma: 0.0256 Peak 2 - y Sigma: 0.1987 Peak 3 - x Sigma: 0.2687

Log Number: 4485666Logbook(s): 

• HCLOG
• BTLOG
• ELOG

Body: 

The scan file for IHA3H07B.04092026_12:12:13 shows a full scan range of 76mm (see figure 1).

The harp scan done on 04072026_7:18:23 shows a full scan range of 76mm with all three wire signals (see figure 2).

*The third wire is the electrical connection to the harp fork that transfers the voltage/current from the harp assembly to the pre-amp, if this third wire was broken we would not see wire signals for the first two wires (see figure 3).

Log Number: 4485661Logbook(s): 

• ELOG
• HCLOG

Body: 

Laser Used:

C Laser

Sigmas:

Peak 1 - u Sigma: 0.2980 Peak 2 - y Sigma: 0.0452 Peak 3 - x Sigma: 0.2070

Log Number: 4485654Logbook(s): 

• ELOG
• RFLOG

Tags: 

• Autolog

Body: 

Comment: 1A SLM acting the foolo
Beam Conditions:
Total Linac Current (R2XXITOT) = 0.4095
Hall A Current (IBC1H04CRCUR2) = 0
Hall B Current (IPM2C24A.IENG) = 0.116708
Hall C Current (IBC3H00CRCUR4) = 13.47
Hall D Current (IBCAD00CRCUR6) = 0
BSY Current (IBC4C00CRCUR5) = 0
INJ Energy (MMSINJEGAIN) = 38.9312
NL Energy (MMSLIN1EGAIN) = 345
SL Energy (MMSLIN2EGAIN) = 345

Gradient Problems:
0L02-7 Klystron Cathode Current (KCCU)=0.00384521 (<=0.7A)
0L03-1 Local Oscillator Power (LOPW)=53.8 (<=70mW)
1L06-1 GLDER=459 (>=200) with RF OFF - Check Detuning
1L07-1 Local Oscillator Power (LOPW)=16.3344

Log Number: 4485650Logbook(s): 

• ELOG
• HCLOG

Body: 

Laser Used:

C Laser

Sigmas:

Peak 1 - u Sigma: 0.6566 Peak 2 - y Sigma: 0.0368 Peak 3 - x Sigma: 0.1150

Log Number: 4485648Logbook(s): 

• ELOG
• HCLOG

Body: 

Laser Used:

C Laser

Sigmas:

Peak 1 - u Sigma: 0.0038 Peak 2 - y Sigma: 0.3636 Peak 3 - x Sigma: 0.1194

Log Number: 4485647Logbook(s): 

• ELOG

Entry Makers: dthomasBody: 

Nudged BSY3C to flatten 3C12 for xC FFB and cycled,
steered end of 3C and 3H
turned on xC orbit lock and let beam converge to target values

Log Number: 4485645Logbook(s): 

• ELOG

Entry Makers: beneschBody: 

Not that much better than yesterday. First peak expanded in each case.

Log Number: 4485640Logbook(s): 

• ELOG

Body: 

I don't believe Alignment would be the responsible group for this PR, but if there is something you need us to look at, please let me know.

Log Number: 4485636Logbook(s): 

• ELOG

Body: 

Laser Used:

C Laser

Sigmas:

Peak 1 - u Sigma: 0.6078 Peak 2 - y Sigma: 0.1330 Peak 3 - x Sigma: 0.0621

Log Number: 4485635Logbook(s): 

• ELOG
• HCLOG
• BTLOG

Body: 

Laser Used:

C Laser

Sigmas:

Peak 1 - u Sigma: 0.6078 Peak 2 - y Sigma: 0.1331 Peak 3 - x Sigma: 0.0620

Log Number: 4485631Logbook(s): 

• ELOG

Body: 

At the next opportunity, these are the magnets that we would like to swap cards for next:

MQB1L26 (NL27B19 ch. 10)
MDB1L27H (NL27B19 ch. 14)
MDJ1L27V (NL27B19 ch. 15)
MQB1L27 (NL27B19 ch. 13)
MQB1L28 (NL27B19 ch. 16)

Log Number: 4485630Logbook(s): 

• ELOG

Body: 

Rather than install an external transformer, we are going with a full replacement. ePAS updated to reflect that.