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"Running phaser for SL at the moment"
HYST AREA 7-0 Cycles Magnets for LEM
LEM South Linac
Hand phased cavities in SL
QuickPic - SL GP check
COMMENT ON RF Maintenance June 24th, 2026
RF maintenance day summary
NL( +10MeV from the maintenance work )
1L07-1 FCC replacement
1L09-2 Tube replacement +5.7MeV
1L09-5 removed attenuation and Klystron characterization
1L20-1 2.5w drive amp replacement +4.3
1L21-5 Arc detector work
SL (+43MeV from the maintenance work)
2L02- 2,3,4,5,6,7,8 recovery after cavity 1 T/S +25.2MeV
2L07-4 Arc detector work +3.7MeV
2L20-8 recovery +2.2MeV
2L25-FCC replacement
2L26-3 Bay 1HV recovery +12.2 MeV
While bringing back the machine we they had to bypass 1L23-8 (high KCCU -4.2MeV) and few cavities in 2L03 and 2L05( for 120Hz oscillati
2L03 and 2L05 instability
recovering 2L03 and 2L05 after the maintenance day took more time than expected. Cavities were unstable and can't stay in SELAP . Looking at the waveforms all cavities had 120 Hz component in GMES and PMES.
At this point it had to be the fcc power supply chassis or the power supply for the pre-amplifier possibly causing this. We had seen something similar in 1L03 in the past.
Xavier went to the zones and measured the ripple on the 24 V power supply for multiple zones in SL
2L03
DC value 23.6 V, AC 0.572 V
FSD Masking Tool: Successful System UN-Masking for: CryoModule
User: eforman
Areas: All
CryoModule Devices:
0L02
0L04
0L03
1L14
1L03
1L02
1L04
1L05
1L07
1L06
1L08
1L09
1L10
1L11
1L12
1L15
1L13
1L16
1L19
1L17
1L18
1L20
1L21
1L22
1L23
1L24
1L25
1L26
2L14
2L03
2L02
2L04
2L05
2L07
2L06
2L08
2L11
2L09
2L10
2L12
2L15
2L13
2L16
2L19
2L17
2L18
2L20
2L21
2L22
2L23
2L24
2L25
2L26
FSD Masking Tool: Successful System Masking for: CryoModule
User: eforman
Areas: All
CryoModule Devices:
0L02
0L04
0L03
1L14
1L03
1L02
1L04
1L05
1L07
1L06
1L08
1L09
1L10
1L11
1L12
1L15
1L13
1L16
1L19
1L17
1L18
1L20
1L21
1L22
1L23
1L24
1L25
1L26
2L14
2L03
2L02
2L04
2L05
2L07
2L06
2L08
2L11
2L09
2L10
2L12
2L15
2L13
2L16
2L19
2L17
2L18
2L20
2L21
2L22
2L23
2L24
2L25
2L26
Starting SL cavity phasing
LEM South Linac
HYST AREA 7-0 Cycles Magnets for LEM
The OPS DRVHs for the following cavities have been updated: 2L05-6
The OPS DRVHs for the following cavities have been updated:
2L05-6
Username: bschauml
Date/Time: 06-24-26_21:55:30
RF Status: Good
Tuner Status: Good
Comment: DRVH=16.500 Dropping out of SELAP above this, very substantial 120 Hz & harmonics on waveforms
Previous OPS DRVH: 19.5
Special Instructions:
LEM North Linac
Machine update
Currently have a downtime going for zone1L23, RF on-call looking into it. LEM'd NL and SL, though may need to redo after all RF issues resolved. Cavities have been phased in the NL, not in the SL. Tune beam has been up to the 1R, has not been to 2R yet. 1E01 harp swipes have been taken as well.










