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User name Nilanga
Log entry time 17:30:14 on October30,2008
Entry number 245606
keyword=Shift Summary
Continue Reference cell pressure curve runs
Run 2516 - Junk run - cell may have contained some 3He
Run 2517 - 515 Torr
Run 2518-2520 Junk Runs - deadtime too high etc
It looks like for the previous runs the deadtime has been very high; and also there is the questions about the correleation of the two pressure gauges: the vacuum guage in torr and pressure gauge in psig.
So we will re-take the N2 runs quickly:
Run 2521 - approx 950 torr - 24.5 psig
Run 2522 - ~ 765 torr - 14 psig
Run 2523 - 511 torr - -5.0 psig
Run 2524 - 246 torr - -10 psig
10.15 - MCC is running Fast-BB diagnostics; asked for access
11.15 - Finally we have the access; sieve installed
11.45 - techs out of the hall, sieve in place, ask for beam
12.00 - Waiting for beam - set for delta scan 4% setting
12.30 - have beam now, but waiting for MCC to change the beam position to the value we need; take a test run in the meantime.
Delta Scan with the sieve
2526 - 4%, beam positions are not good.
2527 - 4%, beam centered on BeO; un-rastered.
2528 - 4%, beam centered on BeO; 1 x 1 rastered beam
2529 - 2%
2530 - 0%
2531 - 0%
2532 - -2%
2533 - -4%
2534 - -4%