Recent Log Entries

Downtime Incident CREATED: SHMS Q3

Log Number: 3657713Logbook(s): Body: IDDescriptionPeriodCause5863Title:
SHMS Q3

Summary:
Hall called to report their SHMS Q3 magnet was down.Duration:
14 minutes

Time Down:
22-Feb-2019 10:06

Time Up:
22-Feb-2019 10:20

iocsoftCAsec restored

Log Number: 3657707Logbook(s): Tags: Body: restorelib 1.0 Target restore date was 2019-02-22 14:08:32 The output from the myRestore execution was as follows: iocsoftCAsec system 3(3) restored Execute: /usr/csite/certified/bin/ced2Epics -ced ced -A -s -i iocsoftCAsec (success)

iocsoftCAsec restored

Log Number: 3657702Logbook(s): Tags: Body: restorelib 1.0 Target restore date was 2019-02-22 14:00:24 The output from the myRestore execution was as follows: iocsoftCAsec system 3(3) restored Execute: /usr/csite/certified/bin/ced2Epics -ced ced -A -s -i iocsoftCAsec (success)

Hall B Orbit Lock Adjustment

Log Number: 3657699Logbook(s): Entry Makers: aikenBody: 

Hall B requested 5nA, which caused the 2C24A BPMs to do that funny oscillation around zero. I adjusted their BPM lock set points to a value that allowed stability, but kept them as close as possible to desired positions. Hall has been notified. 2H01 positions are stable without any change needed.

Testing 1L20 Gradient Push

Log Number: 3657658Logbook(s): Entry Makers: aikenBody: 

Decided to see if we had any room to bump up 1L20's gradient. I raised cavity 3's GSET from 3 to 5 and monitored over the following hour. JT valves bumped up slightly, but they were already close to max, and were not able to maintain liquid level. CHL pressure did not see any effect. Other cavities could be tested, but will require some time to allow LL to stabilize.

SL/LERF helium vapor pressure

Log Number: 3657618Logbook(s): Body: 

LERF asked about recent helium pressure variations. Since there is not good pressure indication in FEL return transfer line, a plot of South LINAC return transfer line pressure is provided.

iocitf1 restored

Log Number: 3657615Logbook(s): Tags: Body: restorelib 1.0 Target restore date was 2019-02-22 10:52:20 The output from the myRestore execution was as follows: iocitf1 system 3(3) restored Execute: /usr/csite/certified/bin/ced2Epics -ced ued -A -s -i iocitf1 (success)

iocitfgpib1 restored

Log Number: 3657610Logbook(s): Tags: Body: restorelib 1.0 Target restore date was 2019-02-22 10:44:59 The output from the myRestore execution was as follows: iocitfgpib1 system 3(3) restored Execute: /usr/csite/certified/bin/ced2Epics -ced ued -A -s -i iocitfgpib1 (success)

Hall A diffuser raster interlock

Log Number: 3657605Logbook(s): Body: 

Contacted by Operations regarding raster interlock setting on hall A diffuser. Interlocks for A and B rasters were at 40 uA. Since A raster is not operational, this prevents beam delivery at or above 40 uA. B raster is being used to raster the beam. Gave approval to raise interlock current to 50 uA for the A raster. The 40 uA setting is a bit conservative anyway and since rastering is being accomplished, the interlock on A is not required.

Hall A -> 40uA, Hall C -> 60 uA

Log Number: 3657594Logbook(s): Entry Makers: rebeccajBody: 

Hall A diffuser issue was fixed and they are now receiving 40 uA. Hall C called to request we push to 60 uA since we were running smoothly. Hall D laser is off, they are happy enough with their low current from bleedthrough. Hall B at 50 nA. 100 uA coming out of the injector with an acceptable trip rate.

1L12-8 CRFP Instability

Log Number: 3657591Logbook(s): Entry Makers: aikenBody: 

Fig1: RAT showed this cavity has having CRFP blips at high beam currents. Fig2: RF health check confirmed this. Fig3: I derated the cavity by 1MeV/m. CRFP is now stable, and the NL energy blips are gone(for now). Fig4: No change to BLM readbacks.

RF Health Check

Log Number: 3657583Logbook(s): Tags: Body: 

Gradient Problems:
1L07-4 Gradient Loop Detector Error RMS (GLDER)=80 (<=0 or >=80ppm)
1L07-5 Gradient Loop Detector Error RMS (GLDER)=87 (<=0 or >=80ppm)
1L24-4 Local Oscillator Power (LOPW)=1.25 (<=70mW)
2L08-3 Measured Gradient (GMES)=0.148 (>=0.1) with RF OFF - Check Detuning or reset faults
2L08-1 Gradient Loop Switch is OPEN
2L08-1 Gradient Loop Detector Error (GLDE)=5 (<=-4.5 or >=4.5)
2L08-1 Gradient Loop Detector Error RMS (GLDER)=197 (<=0 or >=80ppm)
2L20-1[enlk2A:output-x<1>] [FFB LOCK CAVITY] Gradient Loop Detector Error RMS (GLDER)=89 (<=0 or >=80ppm)
2L20-2[enlk2A:output-x<1>] [F

Energy Blips in the NL

Log Number: 3657579Logbook(s): Entry Makers: aikenBody: 

Still energy blips from something unstable in the NL. Fig 1 shows the energy locks. You can see small spikes where the lock is correcting, then it restores back down. SL is responding to the NL energy changes. No spikes in the INJ lock zone. Fig2 shows GMES for the 1L07 cavities. Cavity 1 has period where the gmes fluctuations increase, but not by much at all. Looking at RF analyzing tools.

Operator SIGN IN

Log Number: 3657578Logbook(s): Body:  ACCELERATOR OPERATOR SIGN IN FORM OPERATOR:    Aiken
DATE:             02/22/2019
SHIFT:               Day

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

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