0000428: Random variation of integral values in FCALDigiHits

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Date Submitted

Last Update

0000428

Hall D Offline

General

public

2014-12-03 16:00

2014-12-04 07:21

Reporter

shepherd

Assigned To

davidl

Priority

urgent

Severity

major

Reproducibility

always

Status

resolved

Resolution

fixed

Platform

OS Version

Summary

0000428: Random variation of integral values in FCALDigiHits

Description

For this file:

/cache/mss/halld/RunPeriod-2014-10/rawdata/Run001518/hd_rawdata_001518_000.evio

Running hd_dump produces this output for FCALDigiHit:

================================================================
Event: 5

JANA >>DFCALDigiHit:
JANA >> row: column: pulse_integral: pulse_time: pedestal: QF:
JANA >>--------------------------------------------------------
JANA >> 27 34 5066 733 101 1
JANA >> 29 45 6346 933 101 1
JANA >> 40 55 6386 785 101 1
JANA >> 29 55 5105 6144 102 1
JANA >> 13 41 5038 2592 100 1
JANA >> 13 44 5526 608 100 1
JANA >> 47 36 6393 814 100 1
JANA >> 52 36 5016 2304 100 1
JANA >> 30 13 4982 3557 100 1
JANA >> 14 20 5147 2402 100 1
JANA >> 27 2 4376 1005 101 1
JANA >> 27 3 5624 1385 102 1
JANA >> 0 23 5472 1352 99 1
JANA >> 0 22 4329 1326 101 1
JANA >> 39 2 5007 4068 99 1
JANA >> 57 20 5041 1962 101 1
JANA >> 57 25 5287 1128 100 1
JANA >> 21 52 5560 3934 100 1 <<--- compare this one

A stand-alone plugin run with hd_root produces this with columns: row column integral time samples_integral.

Event: 5
27 34 5066 733 50
29 45 6346 933 55
40 55 6386 785 55
29 55 5105 6144 50
13 41 5038 2592 50
13 44 5526 608 55
47 36 6393 814 55
52 36 5016 2304 50
30 13 4982 3557 50
14 20 5147 2402 51
27 2 4376 1005 50
27 3 5624 1385 55
0 23 5472 1352 55
0 22 4329 1326 50
39 2 5007 4068 50
57 20 5041 1962 50
57 25 5287 1128 53
21 52 61896 3934 45 <<-- to this one

Note the last hit has a different integral. This is seen in multiple events:

================================================================
Event: 6
JANA >>DFCALDigiHit:
JANA >> row: column: pulse_integral: pulse_time: pedestal: QF:
JANA >>--------------------------------------------------------
JANA >> 27 40 6421 935 100 0
JANA >> 29 43 5024 1211 101 1
JANA >> 43 51 5046 5158 100 1
JANA >> 28 51 5024 5621 100 1
JANA >> 29 52 5015 3640 100 1
JANA >> 13 44 5221 473 101 1
JANA >> 34 36 5513 6037 99 1
JANA >> 41 40 4581 0 0 1
JANA >> 37 43 7426 4515 99 1
JANA >> 46 35 5596 2916 101 1
JANA >> 41 44 5004 494 103 1
JANA >> 37 46 4982 546 100 1
JANA >> 33 27 5077 5300 101 1
JANA >> 37 19 5007 5794 100 1
JANA >> 14 18 6386 810 100 1
JANA >> 22 12 28485 5166 100 1 <<--- compare this one
JANA >> 14 11 5083 373 102 1
JANA >> 24 22 5077 1111 101 1
JANA >> 21 21 6399 682 101 1
JANA >> 28 12 5092 445 100 1
JANA >> 30 58 5025 5742 100 1

Event: 6
27 40 6421 935 55
29 43 5024 1211 50
43 51 5046 5158 50
28 51 5024 5621 50
29 52 5015 3640 50
13 44 5221 473 52
34 36 5513 6037 55
41 40 4581 0 53
37 43 3514 4515 36
46 35 5596 2916 55
41 44 5004 494 50
37 46 4982 546 50
33 27 5077 5300 50
37 19 5007 5794 50
14 18 6386 810 55
22 12 2305 5166 26 <<-- to this one
14 11 5083 373 50
24 22 5077 1111 50
21 21 6399 682 55
28 12 5092 445 51
30 58 5025 5742 50

If this is a low level bug, it could have widespread effects. There is some
chance the standalone code has a bug that is corrupting memory, but
it is difficult to see how this is possible as it is just a loop over DFCALDigiHit
objects.

Notes
(0000620) davidl (administrator) 2014-12-04 07:21	Matt Shepherd identified the problem as adding in one sample past the end of the array for late hits when emulating the Df250PulseIntegral objects. A fix has been checked in to the commissioning branch in revision 16738 on 12/3/2014

Issue History
Date Modified	Username	Field	Change
2014-12-03 16:00	shepherd	New Issue
2014-12-04 07:21	davidl	Note Added: 0000620
2014-12-04 07:21	davidl	Status	new => resolved
2014-12-04 07:21	davidl	Resolution	open => fixed
2014-12-04 07:21	davidl	Assigned To	=> davidl

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