Regarding - T3 problem. Without more details it is hard to draw conclusions from remote (where I am too). -Clearly from 'normal' events we have seen from 10-30 hits/plane * 30 ~ 900, well below the limit. - It is likely related to events with a very large number hits either event related or from the general background that are causing the general large currents in the DC (T5 in particular) and high singles rates in H2. And as Ian points out T3 can now 'see' quite far down along the beam towards 12 o'clock. - It is unlikely the threshold was touched- the scan plan was very specific, as also summarized in the report. Since this it not known to all - the main reason for the scans is provide a better understanding for the operation of the drift chambers, which has a much lower effeciency per chamber for overall track finding than is desireable. When the scan runs are analyzed (probably already underway) we should get a report. It may well be needed to perform some more of these in the next couple of days.Until better understanding of the DC operations emerged we should return to angle and magnet settings where the physics measurements can be carried out primarely with the Front Forward spectrometer, and not the high momentum settings, that requires DC tracking. regards ------------------------------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 fax 631-344-1334 e-mail: videbaek@bnl.gov
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