Re: Particular events and InterERP...

Colin Okada (okada@budoe.bu.edu)
Tue, 2 Apr 1996 12:52:10 -0500 (EST)

Hi Antonio,
I looked at your list of events for which you report problems in the
interERP data. As you correctly reported, there is no way to
reconstruct the relative timing of the hits in these events. There is
no data, besides the interERP TDC, that gives us the proper relative
timing for hits in adjacent supermodules (you might be able to do it
with GC information from either the PHRASE or ERP, but I think the time
resolution from these systems might be on the order of ms or us).
Overflows, and zeros of the interERP TDC such as the ones you have
listed, must be considered inefficiencies in the electronics.

Colin

>
> Hi,
> as I said in my talk in the last meeting of upward-going muon analysis
> working group, there are some events where there is no "scintillator track"
> into a single Smod and, as far as I know, it is not possible to correct
> times by means of InterERP in the standard way (essentially due to zero or
> overflow Intererp-tdc values). Is there any way to recover such event?
>
> Here is a sample of such events (from the run set: 9900-11512),
> together with supermodule configuration and InterERP TDC values, as they
> come out using Dream and the standard calibration DB.
> As you can see, such events much frequently occurre during some runs
> (9900,10073,10597-609,10821-22,10989,...), maybe in coincidence with any
> hardware problem...
> Ciao,
> Antonio
>
>
>
> RUN EVENT SMOD'S INTERERP_TDC(IMVX,ISMOD):
> CONFIG. (2,2) (2,3) (2,4) (2,5)
> (1,N) (1,1) (1,2) (3,5) (3,6) (3,S)
> ===========================================================================
> 9900 137 ----45-- - - 2 0
> - - - 1172 - -
> 9900 153 ----45-- - - 2 0
> - - - 1225 - -
> 9900 295 ---345-- - 0 2 0
> - - - 1342 - -
> 9900 1295 ----45-- - - 2 0
> - - - 1144 - -
> 9900 1511 ---34--- - 0 2 -
> - - - - - -
> 9900 2304 ----45-- - - 2 0
> - - - 1574 - -
> 9900 2608 ----45-- - - 2 0
> - - - 1187 - -
List truncated for brevity....