Wednesday 2/5/12
A 1 hour intervention by the BI team to replace the head amplifiers for the pick-ups in BTP10 & BTP30
solved the bad acquisition problem, and we could measure the correct trajectories again. The supposed
misalignment of the pick-up in BT20 for R1 & R2 remains a problem, so the trajectories are still unusable
here.
With the improved ejection trajectories, it was possible to see that the jumps in the R1 & R2 ejection
trajectories seemed to be due to BT2.SMV20 fluctuating by 100A (for ~25000A). The PiPO and specialist
J-M. Cravero worked on the problem replacing and auxiliary PSU and filter, but noticed the problem
disappeared when the OASIS cable was disconnected. It appeared that this was inducing noise into the
SMV and was left disconnected.
Thursday 3/5/12
Tests with BR2.DVT3L4 showed that there was an unexpected influence on the orbit, so this was
followed up by Jean Francois and the specialist.
The RF guys and the Controls specialists worked to be sure that all the new knobs etc that were created
for the FINEMET cavity tests were saved into the archives and references, which is now the case.
In the evening a RF tank tripped in L2 due to LA1.VGP01, the operator took charge and the beam back
after 10mins.
At 00H15 the BT4.BVT10 tripped and required an intervention by PiPO. The beam was delivered with
only 3 rings until he replaced a DAC card which fixed the problem around 02H00.
Friday 4/5/11
There was a brief PS intervention in the morning, so we checked that nobody needed PSB access, which
was the case.
J-M Cravero confirmed that the problems experienced with BT2.SMV20 had disappeared since the OASIS
cable had been disconnected, so we agreed to continue like that for the weekend. He is investigating
putting an isolation amplifier in between this cable and the equipment, but this will be done next week
when he can keep a close eye on it. The ejection trajectories seemed much more stable and so we were
convinced this had been the problem.
SFTPRO was required for the first time in a while, and when re-loaded needed some adjustment to bring
it back to specification. While trying to do PPM copy from CNGS, we started to get unexpected errors
when doing an "acquire", which we reported to the INCA support team. The support team joined us in
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