Here is the latest status:
0) brief CDEV readout history:
- 1 Aug 2000, run ~2002, Started. Occasionally, data goes stale.
- 21 Aug 2000, run ~2371, Read the polarity (A/B versus +/-).
- 23 Aug 2000, run ~2404, RHIC fixed CDEV bug that caused stale data.
- 31 Aug 2000, run 2492, CDEV readout did not restart after an opus crash
- 3 Sep 2000, run 2525, CDEV readout restarted.
- 7 Sep 2000, run 2552, last run with beam.
- 11 Sep 2000, run >2552, CDEV readout did not restart after an opus crash.
1) The run database was manually corrected to conform with CDEV data,
with exceptions:
2) Currently known discrepancies between current run
database (after corrections) and CDEV:
- run 2286, CDEV reports D1 and D2 changing state (off->on)
in the middle of the run. Run database entries left "undefined"
for these two magnets. D5 is off (both CDEV and log book agree on this).
- runs 2355 through 2377. CDEV reports D1 and D2 on, database- off.
- run 2378, CDEV had read errors, magnet status unknown. This is a debug
run not sent to HPSS.
- runs 2388 through 2401, D5 polarity is unknown.
- runs 2402 through 2411, D5 polarity is known to be "B",
CDEV reports "A". Database has the correct "B" polarity.
- runs 2412, 2413, D1 and D2 state unknown. CDEV claims "on",
database claims "off".
- run 2418, D1 and D2 cycled in the middle of the run (run down, then up).
- runs 2433 through 2442, D1 status suspect: CDEV reports "off",
database claims "on". D2 is on, D5 is on.
- runs 2437 through 2439, D5 flield is "700/A" in CDEV, "350/A"
in database. CDEV data is supposed to be reliable in these runs.
- run 2445, D4 turned on in the middle of the run.
- runs 2459 through 2462, CDEV: all magnets are off, database: D1, D2, D5
are on. These are debug runs.
- run 2468, D1, D2 and D5 turned on in the middle of the run.
- run 2469, database claims all magnets are off. CDEV claims D1, D2, D5
are on (turned on during run 2468).
- runs 2472 through 2487, D3 and D4 are on, database claims they are off.
- run 2486, D1 and D2 cycled in the middle of the run (turned off, then on).
- runs 2496, 2497, pedestal runs. Magnets are on, database claims off.
- runs 2498 through 2525, D5 polarity mismatch: CDEV is "A", while
database shows "B". CDEV is incorrect- readout was not running.
- runs 2526, D1, D2, D3, D4 wrong polarity.
3) discrepancies with data from Flemming (log book?):
- on Aug 18th, D1=520/? (same on db), D2=410/? (same in db),
D5=350/?, while CDEV shows 700/A. These are runs 2337 through 2348.
- run 2337 D5=350/B. cdev shows 700/A (stale data?).
- run 2289 D5=700/B. cdev shows 700/A (stale data?).
- run 2286 D5=0. cdev shows 700/A (state data?).
- run 2278 D5=350/?. cdev shows 700/A (stale data?).
- on Aug 14th, D1=520/A, D2=410/A, D5=700/A. cdev shows D5=0 for most
of the day. Runs 2239 through 2250.
K.O.
On Mon, Oct 09, 2000 at 12:20:44PM -0400, Flemming Videbaek wrote:
> Inspection of the log book reveals that on August 14, 2000 the setting were
> clearly marked
> as D1 520A A
> D2 409A A
> D5 700A A
> with the second A in a seperate column.
>
> Though at run 2278 the notebook clearly says field changed to 350 for D5 but
> not reflected in cdev
> readout ?.
> 2286 correctly say B=0
> 2289 say change to -4KG 700.03 A
>
> Again run2337 says change to -2KG B polarity
> Book#4 page 116
> On 8/18 the log has a specific readoutof D1,D2,D5 - 520,409 and 350
>
> Thus I conclude the confusion is great.. The field OFF runs seems recorded
> right (at kleast in some places)
> but the +- and change from 700->350 seems quite confused even during the
> runs 22.. -23 .. that are still
> important dataruns.
>
> Flemming
>
>
> >
> >
> > 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
> >
>
--
Konstantin Olchanski
Physics Department, Brookhaven National Laboratory, Long Island, New York
olchansk@bnl.gov
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