SoLID DAQ » SoLID ECal

h1. How to decode MWPC data

The decoder of MWPC can finally create root tree.

The decoder is located at  /home/a-compton/MWPC/analysis/track/anatka.C

MWPC calibration is stored at /home/a-compton/MWPC/analysis/track/anatk.inp

It includes the reference positions of each chamber, also the pedestal of each TDC module.  

Most importantly, it tells the time cut value which will be used to determine if a hit is out of time.

Here is how is looks:

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[a-compton@soliddaq track]> cat anatk.inp

/home/nfs/ftbf_user/experiments/EDIT2018/MWPC/data/exp_20180312155107.dat              ifile

1

    5000000

    198.8     475.0    758.8     1534.5                  zz

     6.362    6.498     6.45       6.48                  xi

     6.44      6.49     6.41       6.42                  yi

     0.45 

   59 58  59  60  50  51  51  52

   50 50  53  54  50  50  49  48

   18                                                    | itwin (time window)

========================================================================

 line 1   file name of data to process

 line 2   file flag.  if 1  use the file selection, if 2 use the name from liine 1

 line 3   event limit

 line 4   Z locations of chambers.  0 is upstream face of hall.   units  cm

 line 5   x0  location of first wire  in x

 line 6   y0

 line 7   Allowable window for finding possible hits on a track

 line 8   Center of time distributatioin TCDs 0 - 7

 line 8                                       8 - 15

 line 9   Require time in the tdcs be within +/- this value

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How to run the decoder:  

step 1):  synchronize the raw data file    /home/a-compton/MWPC/cpdata.csh

step 2) run decoder:   /home/a-compton/MWPC/analysis/track/wctree.csh

A) It will ask you which file you want to decode, you make your choice here, usually

the last file is the latest run.

B) After you select which file to decode, it will read the first line to tell you what is the 

possible run number. Some times this value is wrong. You can type in the correct run 

number if you are sure, otherwise just copy the run number.

C) What is the output?

 root tree will be stored at  /home/a-compton/MWPC/wcnt_xxx.root,  where xxx is the run number.

beam position figure will be store at   /home/a-compton/MWPC/log/BeamPosition_xxx.png

=======================================================

wire ID definition:  

  0-127    chamber0 X plane

128-255    chamber0 Y plane

 256-383   chamber1 X plane

384-511    chamber1 Y plane

512-629    chamber2 X plane

630-757    chamber2 Y plane

758-885    chamber3 X plane

886-1023   chamber3 Y plane

The root file includes a lot of monitoring histogram, also the tree named 'M':

Here is the tree branches:

 spill           -->spill number

 evn           -->event number

 etime        -->event time relative to spill start

 nhit_raw    -->number of raw hits

 wire_raw   -->wire id of raw hits 

 tdc_raw    --> tdc of raw hits 

 nhit_tcut   -->number of hits after time cut

 wire_tcut  -->wire id of hits after time cut 

 tdc_tcut    --> tdc values after subtracted the pedestal and pass time cut

 nx0           -->number of hits in chamber0 X plane

 x0             -->X positions of chamber0 X plane

 ny0           -->number of hits in chamber0 Y plane

 y0             -->Y positions of chamber0 Y plane

 nx1           -->number of hits in chamber1 X plane

 x1             -->X positions of chamber1 X plane

 ny1           -->number of hits in chamber1 Y plane

 y1             -->Y positions of chamber1 Y plane

 nx2           -->number of hits in chamber2 X plane

 x2             -->X positions of chamber2 X plane

 ny2           -->number of hits in chamber2 Y plane

 y2             -->Y positions of chamber2 Y plane

 nx3           -->number of hits in chamber3 X plane

 x3             -->X positions of chamber3 X plane

 ny3           -->number of hits in chamber3 Y plane

 y3             -->Y positions of chamber3 Y plane

=======================================================

The description of monitoring histogram is here:

 OBJ: TH1F     h100    All Wire Hits : 0 at: 0x1ed4740

  OBJ: TH1F     h200     M TDC 0 : 0 at: 0x1f7e800

  KEY: TH1F     h301;1  X Dev 2  1234

  KEY: TH1F     h302;1  X Dev 3  1234

  KEY: TH1F     h311;1  Y Dev 2  1234

  KEY: TH1F     h312;1  Y Dev 3  1234

  KEY: TH1F     h305;1  X Dev 2  123

  KEY: TH1F     h306;1  X Dev 2  124

  KEY: TH1F     h307;1  X Dev 3  134

  KEY: TH1F     h308;1  X Dev 3  234

  KEY: TH1F     h315;1  Y Dev 2  123

  KEY: TH1F     h316;1  Y Dev 2  124

  KEY: TH1F     h317;1  Y Dev 3  134

  KEY: TH1F     h318;1  Y Dev 3  234

  KEY: TH1F     h380;1   Raw Hit/Event

  KEY: TH1F     h381;1   Hits/Event after Tcut

  KEY: TH1F     h390;1   Times after Tcut

  KEY: TH1F     h391;1   Times before Tcut

  KEY: TH1F     h392;1   Offset Times before Tcut

  KEY: TH1F     h100;1  All Wire Hits

  KEY: TH1F     h120;1  Event Time

  KEY: TH1F     h121;1  Time bet. Ev

  KEY: TH1F     h130;1  Events per Spill

  KEY: TH1F     h150;1  h150 Wire Chamber 1 X

  KEY: TH1F     h151;1  h151 Wire Chamber 1 Y

  KEY: TH1F     h152;1  h152 Wire Chamber 2 X

  KEY: TH1F     h153;1  h153 Wire Chamber 2 Y

  KEY: TH1F     h154;1  h154 Wire Chamber 3 X

  KEY: TH1F     h155;1  h155 Wire Chamber 3 Y

  KEY: TH1F     h156;1  h156 Wire Chamber 4 X

  KEY: TH1F     h157;1  h157 Wire Chamber 4 Y

  KEY: TH1F     h160;1   Hits 1X

  KEY: TH1F     h161;1   Hits 1Y

  KEY: TH1F     h162;1   Hits 2X

  KEY: TH1F     h163;1   Hits 2Y

  KEY: TH1F     h164;1   Hits 3X

  KEY: TH1F     h165;1   Hits 3Y

  KEY: TH1F     h166;1   Hits 4X

  KEY: TH1F     h167;1   Hits 4Y

  KEY: TH1F     h110;1  All Time Hits

  KEY: TH2F     h181;1   Chamber 1

  KEY: TH2F     h182;1   Chamber 2

  KEY: TH2F     h183;1   Chamber 3

  KEY: TH2F     h184;1   Chamber 4

  KEY: TH1F     h200;1   M TDC 0

  KEY: TH1F     h201;1   M TDC 1

  KEY: TH1F     h202;1   M TDC 2

  KEY: TH1F     h203;1   M TDC 3

  KEY: TH1F     h204;1   M TDC 4

  KEY: TH1F     h205;1   M TDC 5

  KEY: TH1F     h206;1   M TDC 6

  KEY: TH1F     h207;1   M TDC 7

  KEY: TH1F     h208;1   M TDC 8

  KEY: TH1F     h209;1   M TDC 9

  KEY: TH1F     h210;1   M TDC 10

  KEY: TH1F     h211;1   M TDC 11

  KEY: TH1F     h212;1   M TDC 12

  KEY: TH1F     h213;1   M TDC 13

  KEY: TH1F     h214;1   M TDC 14

  KEY: TH1F     h215;1   M TDC 15

  KEY: TH2F     h320;1   X(6) Y(5) Tracks

  KEY: TH1F     h321;1   X Tracks

  KEY: TH1F     h322;1   Y Tracks

  KEY: TH1F     h341;1   X Track Slope

  KEY: TH1F     h342;1   X Track Intercept

  KEY: TH1F     h343;1   Y Track Slope

  KEY: TH1F     h344;1   Y Track Intercept

  KEY: TNtuple  trk;1   StLine

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