User name R. Michaels
Log entry time 01:53:40 on September28,2005
Entry number 156299
keyword=more Q2 scanner studies, part I
Part I of Q2 scanner runs with various magnet settings.
Run 5425 -- everything normal (to get a baseline), i.e. sweeper is
on, beam is 36 uA. After about 13K events we see R-sept at 7.69K,
so we ask for 30 uA, then ask for beam off. Stop run. Too hot !
BTW, now I think I know why the voice alarms didn't work this
morning when we tripped: someone had set the alarm level to
"greater than 7.695", which I think is too high...
Run 5426 -- sweeper still on but we reduce current to 25 uA since
it will tend to overheat septum when we do subsequent tests.
01:22 sweeper turned off
Run 5427 -- scan with sweeper off
Again the septum gets too hot ! 7.72K. So we turn beam off,
stop run 5427 at event 15K. After a few minutes cooling we
ask for 10 uA.
Run 5428 -- sweeper still off. 10 uA now.
Fig 1 shows the scan results for run 5428. Shoulder qualitatively
the same as before.
Run 5429 -- sweeper back on. 111Amps. Still 10uA beam. We wanted
to repeat the baseline with this lower beam current.
More to come ...