The target FSD box has been updated so that we will be
able to run safely on Al frame (g0log entry #72665
).
Beam was announced in hall C around 6pm.
Just before 7pm, first result on hall A beam energy
spread
(elog entry #1189023
) : they need an improvement of one orrder of magnitude.
At 7:40pm, a laser attenuator problem was
reported.
Best estimate for hall C delivery : midnight.
After a call to MCC, we learnt that they need at least
5 hours before sending G0 beam.
Accelerator
status
1am, the beam is resteered at the injector and the
injector
optimization restarted.
2am 40uA G0 beam in the machine.
4:20 Vacuum problem (shut
doown in East Arc)
At 7am, MCC people told me that
there won't be any beam for the whole day shift.
As we do not have any target I
decided to cancel G0 day shift.
At 8:30am the PD told us that
they
are suspecting a leak somewhere in the accelerator.
Identification of the problem and
repair won't allow us to get any beam today and more likely not
before tomorrow morning.
Still the first priority remains to work on hall A/C
compatibility.
In agreement with the PD, today shifts in Hall C and
B have been cancelled.
Nevertheless I made sure that everybody has still in
mind to page Kaz as soon as we get the beam.
Both Linacs have been put in restricted access to
investigate
the problem.
At 2:30 they have fixed the leak and they were starting
to pump down.
They said that now they are on the way to restart
everything
: RF recovery, injector optimization, reviewing the optics, ...
At 7pm, MCC said that it is more likely that no beam
will be available before 5am sunday morning.
At 10:30pm, the PD said that it will take at least the
owl shift to recover and more likely untill sunday noon.
I cancelled the owl shift and said to Angella (the only
one on shift at 8am tomorrow) that I will contact her if any beam is
expected.
I hope to have better news tomorrow morning.
On G0 side
...
- NA DNL measurements have been
performed (grey noise box) Angella and
Joachim
- Some tests have been perform
on the YO (extra TDC VME channels) Klaus
- New FR electronics TDC
Differential
Linearity Optimizations have been performed Domi
and Jacques
- Understanding of analysis
problem
when we ran with 9 DMCH boards in progress Paul
- BPM calibration run
Junho
- Attempt to take FR DNL data
from
green blocks overnight Jean-Sebastien,Jacques,
Domi and Klaus
7:30pm After accelerator recovery update I
informed the PD that we are about to turn on some of our
detectors.
He'll make sure with all crew chiefs that NO beam will be sent to hall
C without letting me know.
We
encountered
DAQ problem : TS0 is complaining and its window disappears by itself...
(g0log entry #72713
)
10:45pm
I informed the PD that our detectors are turned off so that any beam can
be send anytime.
11:30pm
we left the counting room