F1

From here, we would like to explain in detail how to analyze the actual experiment. We assume that you have already prepared your the analysis environment. It is okay either your own directory or the default directory (see CRIB configuration). If you are not ready yet, please see here.

So let’s start to check the data. At the F1 focal plane, there is (charge-divition) PPAC. The steering file to analyze f1 data is chkf1.yaml.

• steering/chkf1.yaml

We usually use “chk” (check) as a prefix of the steering files to analyze from raw binaly data.

$ artlogin (username)
$ a
artemis [0] add steering/chkf1.yaml NAME=hoge NUM=0000
artemis [1] res

The important data is “X position” at the F1PPAC. The histogram can be check by following step:

artemis [2] sus
artemis [3] ls

 artemis
>   0 art::TTreeProjGroup f1check         f1_check
    1 art::TAnalysisInfo analysisInfo

artemis [4] cd 0
artemis [5] ls

 f1check
>   0 art::TH1FTreeProj f1ppac_X        f1ppac X
    1 art::TH1FTreeProj f1ppac_Y        f1ppac Y
    2 art::TH1FTreeProj f1ppac_X1raw    f1ppac X1raw
    3 art::TH1FTreeProj f1ppac_X2raw    f1ppac X2raw
    4 art::TH1FTreeProj f1ppac_Y1raw    f1ppac Y1raw
    5 art::TH1FTreeProj f1ppac_Y2raw    f1ppac Y2raw
    6 art::TH2FTreeProj f1ppac_x_y      f1ppac X vs Y
    7 art::TH2FTreeProj f1ppac_x_rf     f1ppac X vs RF
    8 art::TH2FTreeProj f1ppac_x1_x2    f1ppac x1 vs x2
    9 art::TH2FTreeProj f1ppac_y1_y2    f1ppac y1 vs y2

Many histograms are defined, but in practice it’s enough to check the first X position. Sometimes we check other raw data histograms to see if the behavior of F1PPAC is correct or not.

artemis [6] ht 0

Usually a gaussian fit is performed to get center the position.

artemis [7] xf

For the commane “xf” (xfitg), please check here.

When you think the signals from F1PPAC is okay, but position seems wrong (the X position is different from the setting of F1 slit), pleace modify the parameter files.

• prm/ppac/ch2q.prm
• prm/ppac/f1ppac.yaml

It is actually charge-divition PPAC, but the structure of parameter file is the same with dl-PPAC, so please also check PPAC preparation.