Please note that the BRAHMS Magnet settings data (D1, D2 and D5) for runs 2031 through 2418 (3 - 23 of August 2000) has been updated in the run database. The updated data can be seen in the usual web reports at http://pii3.brahms.bnl.gov/daq-cgi-bin/cgiRunSummary.perl linked from the main daq page at http://pii3.brahms.bnl.gov/~daq. Starting from run 2418, the magnet data has been entered by the operators from the "begin run" dialog. These database entries were not changed. For runs before run 2418, some magnet data is available from my archive of CDEV data. These data were manually entered into the run database with the following caveats: - D3 and D4 were marked "off" for all runs between run 2185 and run 2417. As I understand these two magnets were not operational at the time and were actually locked out. - for runs before run 2411, the polarities are "+" and "-" instead of the normal "A" and "B". At this time I do not know which is which (Polarity "+" is "A" or "B"?), but this will be looked into and the database will be updated when I know the answer. Expect "+" and "-" to disappear. - a number of instances were found where the magnet settings appear to have changed during a run. Sometimes the magnet settings changed within a few minutes of starting or ending a run. This has been chalked off as operator sequencing mistakes and the database will show the magnet settings used during the duration of the run. Sometimes the settings appear to change smack in the middle of the run and the corresponding database entries were left blank (i.e. run 2378). From available CDEV data, it is not clear if the magnet setting change was real (operator forgot to start a new run while turning the magnet on or off), benign (RHIC went down, the operators turned down the magnets but forgot to end the run. Benign because no data were taken with the wrong fields), or a CDEV readout malfunction (and I see quite a few of them, for example, CDEV data for runs 2387 through 2413 contains mostly errors). - CDEV magnet data starts at run 2022 and until run 2185 all magnets appear to be always off (except for D1 in runs 2031 and 2032). I would like somebody (Dana?) to confirm when the first magnets were first turned on (when the water system was turned on?) before I put this into the database. -- Konstantin Olchanski Physics Department, Brookhaven National Laboratory, Long Island, New York olchansk@bnl.gov
This archive was generated by hypermail 2b29 : Sun Oct 08 2000 - 21:43:52 EDT