The analysis of the 'scan runs' would be underway, but the connection to BNL from NBI is even worse than usual. Also, it does not seem to be possible to use BRAT on the crs farm. I suppose this is related to the AFS problems of the past few days. RCF claims that things are working, but I cannot connect to any RCF machine to find out. Since this is not an unusual occurrence, we should perhaps try to find a way to be more independent of the RCF and BNL computers. How we do this in practice, I have no idea today (at least not within present financial constraints). Ian -----Original Message----- From: owner-brahms-l@bnl.gov [mailto:owner-brahms-l@bnl.gov]On Behalf Of Flemming Videbaek Sent: Friday, October 05, 2001 12:29 PM To: brahms-l@bnl.gov Subject: re T3 and current running 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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