Aggregator
"xB resumes 150nA on Empty Cell"
"xB BNR to empty H2 target"
Unable to acknowledge VIP2I02A alarm
CHL autoheat restarted for North and South Linacs
QuickPic - NL/SL heater cryo alarms
Hall D changing orientation of the diamond radiator
Sudden jumps in 0I05 Horizontal position correlated with Hall B current losses
Three times in the past half hour, we've noticed a sudden drop in Hall B's current that recovers over the course of less than five minutes. These drops coincide with a sudden jump of a few hundred microns in the horizontal position at IPM0I05. The cause, like many others at the moment, is unclear. The chopper appears to be behaving normally. If you squint, there appears to be some vacuum activity that might suggest something in the chopper is charging and discharging, but it's hard to tell.
ATLis Comments Daily Digest
Autolog save
Hall B upstream halo excursions uncorrelated to beam in the machine
Twice in the past hour, we have had bursts of noise on the upstream halo counters that seem to be uncorrelated to beam in the machine. In figs. 1 & 2 the upstream halo counter is in brown, injector BCM is in pink. Note that the noise in the upstream halo counter appears while sending beam and trips the beam off. Despite beam off, the noise continues for several minutes until it suddenly stops without intervention.
Hall B was contacted and their system expert is investigating.
MQA8S06A mismatch
CREW CHIEF SIGN IN
THOMAS JEFFERSON NATIONAL ACCELERATOR FACILITY
ACCELERATOR OPERATIONS CREW CHIEF SIGN IN FORM
Date : 05-08-26
Time : 15:26:56
Day : Friday
Shift : Swing
Crew Chief : Forman
Program Deputy: Drury
Team : X
Arm : Shriner
Designated SSO: Shenenberger
LERF Operator:
Operators : Anthony, Shenenberger, Shriner
This stamp certifies that the above Crew Chief has read/reviewed/received the following:
Hall D current stability and slit size
Hall D beam currently using chopper slit A. When A slit was closed down to 17mm, current stability was very poor, bouncing between 0 & 28 nA while trying to send 25 nA. Opening the Hall D slit reduces current instability to +/- 2 nA.
No deleterious effects on Hall B halo rates noted.
We were sending Hall C witness tune beam at the time in addition to B & D CW.
Suddenly seeing Hall B upstream halo counts with no beam in the machine
Not long after opening Hall D's slit in an attempt to stabilize their current, began seeing jumps in upstream halo rates at Hall B. We assumed this was a consequence of increased bleedthrough, but now we're seeing counts with the beam off, tripping FSD on halo counts without actually sending. We are confused, to say the least.










