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The following cavities have been bypassed: 2L04-6
The following cavities have been bypassed:
2L04-6
Username: samari
Date/Time: 04-10-26_03:15:51
RF Status: Bad
Tuner Status: Good
Comment: Bypassed - stepped off +100k - fil volts low
Special Instructions:
Maintenance Tag: Component: Operator Entry - See SME
cav 6 dropped 2L04 HV on filament volts low
QuickPic - xC->4cmDummy at 40uA
AutoLog - UNMasking Hall C Normal Target
iCalibrate: Hall C
"Hall C -> BNR for target change"
AutoLog - Masking Hall C Normal Target
Huge 60 Hz + 75 Hz noise at 1E01, Huge vertical 60 Hz at 4E01
The double peak frequency of oscillation at is very consistent in fig 1 at 1E01, the first single pass SEE BPM past the NL. The injector SEE BPM's sample rate is a little bit to high to see 60 Hz, So I can't differentiate between north linac and injector as the source. at 4E01, the 60 Hz vertical oscillation amplitude grows to a whopping 1.5 mm (fig 2).
Tuned 1L03-2
"NL gangphase lock engaged"
Tuned 1L03-3
Operator SIGN IN
Operator SIGN IN
NLSB MO Line lacking insulation
So far, the indicator most correlated with drifts in the north linac gang phase has been the Zone 1 temperature in the service building (Figure 1. Second chart with negative zone temperature to better show correlation). I took a walk out to visually inspect that area (Figure 2), and found that the MO line behind 1L02 has a lot of insulation peeled off with a decent chunk of the MO exposed (Figures 3-5) compared to the same area in the south linac (figure 6). Bundling this section back up might not be a bad idea.
smartRAT Cavity Instability Detection Daily Report
To view waveforms from a timestamp:
ssh opsrfdaqnl1 "smartRAT -m DAQ -d /data/fast_daq/<timestamp>"
To view waveforms of the top 25 from this report:
ssh opsrfdaqnl1 "smartRAT_view_daily_top25 2026-04-02-2026-04-09"
Data directory: /cs/prohome/apps/s/smartRAT2/3-3/fileio/pca_data/output_cavityOutDet/calibrated_cavitylevel_centralize_tsfresh_minimal_gmespmes/whole/rcntnp/2026-04-02-2026-04-09/PCA/
Looking into harp beam jitter in 3C line
Figs 1&2: Comparison of main machine harp velocities vs. Hall C. Additionally, the 3C07A/B, 3C12A/B, and 3C17A/B harps all have x,y,x wires.
On the 3C07A/B harps, there's not a lot of motion on either the x or y wires for these swipes. Judging by the Hall C Steer Up screen and the BPM screen, this is not a particularly dispersive region.
On the 3C12A/B harps, interestingly enough, there's almost no motion on the y wires but the x wires show heavy beam jitter.
Autolog save
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 04-09-26
Time : 23:19:21
Day : Thursday
Shift : Owl
Crew Chief : Price
Program Deputy: Ogur
Team : D
Arm : Samari
Designated SSO: Smith
LERF Operator:
Operators : Samari, Smith
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
Crew Chief Shift Log, 2026-04-09 SWING
Start of shift: 15uA CW to Hall C.










