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    User name R. Michaels

    Log entry time 06:14:11 on January27,2008

    Entry number 227374

    keyword=Short how-to on analysis

    How to analyze the PREX detectors.

    1. Login to adaql1 as "adaq" account. Type "goprex" to
    go the the correct directory (and this sets $DB_DIR).

    2. Type "analyzer". Without the quotes, of course.

    3. In the analyzer prompt, type ".x onlana.C" (w/o quotes).
    Answer which run number. Note, the number of events is controlled
    in onlana.C -- see the line "run.SetLastEvent(500000);"

    4. Once the analyzer finishes running, you have a tree "T"
    and can execute commands like these (they are examples of macros):

    .x align.C --> shows alignment
    .x hapdet.C --> shows PREX detector data
    .x pmom.C --> shows momentum w & w/o cuts
    .x hapdet_fine.C --> more PREX plots

    ... etc.

    5. The root files are in /adaql3/work1/happexsp/onlroot

    6. Some variables:

    P.hapadc1 = S0B
    P.hapadc2 = S0F
    P.hapadc3 = thin PREX detector
    P.hapadc4 = thick PREX detector
    P.hapadc5 = amplifed thin PREX detector (if plugged in)
    P.hapadc6 = amplifed thick PREX det (if plugged in)

    P.haptdc* = corresponding TDCs

    For a list of other variable in the "Podd" analyzer:
    http://hallaweb.jlab.org/root/doc/variables.html