-- ________________________________________________________________________________ Tancredi Botto, phone: +1-617-253-9204 mobile: +1-978-490-4124 research scientist MIT/Bates, 21 Manning Av Middleton MA, 01949 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^On Mon, 23 Jun 2003, Tancredi Botto wrote:
> > I just realized that I left a wrong plot in the logbook. Also the > rate during the last batch of ABS runs (700-800) is consistent with a > flow in the cell of M=2, not M=1. I.e. molecular. > > Using the tof elastic filter it is very quick to do tof-only > analysis where the reconstruction efficiency must be high. The main > difference is that the timing cuts are truly cuts now: 40-60 channels (2-3 > ns) at max, not 100-200.. Doing that and with an ADC cut, tof coplanarity > most always turns out ok automatically. > > >From data of this weekend I "determined" the ABS flow comparing > TOF rates for ABS runs and unpol runs (where the flow is known and > is known to all go into the cell). The ABS flow (single spin state) > is 1.6E16 At/s which is close to expected. > > With that flow and (similarly determined) gas temperature (120 +- 10K) I > compare the expected cross section (montecarlo) with the L/R tof data > after an adc cut, as a function of tof number. The normalization is done > on the montecarlo curve, and the difference between M=1 and M=2 is shown. > >
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