Once again This is clearly a (difficult issue). What is put into the RUNDB at the start of the run is the setpoints as defined in the begin run - tab on the DAQ interface. If this does not correspond to the actual setting the RUNDB values are no good. Two other actions are going on asyncrouneously with the DAQ begin/end - i) A perl script reads the actual magnet status via the RHIC cdev and reports this on the Magnet-status page this is also written as a long log file and one can scan this. In fact this is the quickest way to see if the magnets are in a proper state a any given time (apart from being in the CH in front of the RHIC control) ii) The hall probes clearly though not precise tells us if the current are on. They are read once a minute and recorded in the conditions DB. This DB is related to time - not run numbers. Neither of this can at present be incorporated in the DAQ start, and you probably would not do so. Starting a run ought not to dependt if or not you can read some other devices. The solution is of course to correlate the Hall probe reading with the begin run info and then yell and scream if the do not agree - Any volunteers !? This is always the problem right now. So shift people have to be diligent. As these mistakes gets discovered the entries can be changed, but until then beware. In this spirit run 5761 has excately the same problem!! B=0, but not in DB. . ------------------------------------------------------ Flemming Videbaek Physics Department Brookhaven National Laboratory tlf: 631-344-4106 fax 631-344-1334 e-mail: videbaek@bnl.gov ----- Original Message ----- From: "Ian Bearden" <bearden@nbi.dk> To: <brahms-l@bnl.gov> Sent: Sunday, November 11, 2001 5:00 PM Subject: RE: Shift report 20011111 00:00-08:00 > Hi Collaborators, > > I'm really glad that I read this mail now. I just reduced and ran a quick > reco on 5757 and could not understand the spectra at all. If the magnets > were off, I guess that would explain things. And now that I see that this > is the reason for the odd spectra, I'll spend the last hour of my weekend on > something more enjoyable. > > I think this episode tells us that we need to (somehow, and I don't know > how) have the actual current (or field) readings in the database. This is > the second time that I know of that we have run with zero field, even though > the log and the data base show that the magnets were on. > > Ian > > > -----Original Message----- > > From: owner-brahms-l@bnl.gov [mailto:owner-brahms-l@bnl.gov]On Behalf Of > > Flemming Videbaek > > Sent: Sunday, November 11, 2001 4:47 PM > > To: brahms-l@bnl.gov > > Subject: Re: Shift report 20011111 00:00-08:00 > > > > > > I was checking the run 5757 and did not get any reasonable > > momentum spectra > > > > - From the DAQ magnet status page I can see that all magnet d1-D5 were in > > standby fault mode since Saturday Nov 10 at 14:37. Runs since > > then are thus > > all zero field run > > - Please correct and repeats runs/settings lost. > > > > - On the magnet page beware the current is given 3 places > > a) wfg - setting > > b) wfg - readback > > c) current readback -- This is the tru indication of magnet on > > > > > > ------------------------------------------------------ > > Flemming Videbaek > > Physics Department > > Brookhaven National Laboratory > > > > tlf: 631-344-4106 > > fax 631-344-1334 > > e-mail: videbaek@bnl.gov > > > > > > > > > > >
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