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    User name N Toro

    Log entry time 01:54:26 on July 07, 2010

    Entry number 330562

    keyword=sieve partially in puzzle

    Run 1816 is an HRS-R run triggering on modified T6 (S2m-R + GC-R -- the makeshift positron trigger), with the sieve only partially inserted. I see no hint of contrast as you look across the acceptance (I'm just using the tg_th and tg_ph variables in the standard online analyzer.

    But there must be contrast: the scaler rate for the modified T6 (S2m-R + GC-R) goes DOWN by about a factor of 2 when we remove the sieve. [Why the sieve INCREASES the positron rate rather than decreasing it is another puzzle.]

    It may be that the "partially in" position was almost entirely in (note the T6 scaler rates were very similar for 1816 as for the sieve-in runs), so this wasn't a good contrast test.

    A copy of this log entry has been emailed to: jinhuang, schuster