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    User name Jin Huang

    Log entry time 20:32:06 on February11,2009

    Entry number 260548

    This entry is a followup to: 260539

    keyword=Target Direction in d2n Data

    Target polarization direction is sent into d2n data stream through LHRS ADCs. One can check the signal validity and direction in the online plots as below.

    The advantage of this signal are:
    1. The signal is maintained by target expert, which is a reliable target direction stamp on each event
    2. If TO accidentally did a NMR within a production run (target spin will flip twice during the process), those events will be automatically stampped "unkown target spin" during the NMR.

    The definition convention follows standard Hall CS:
    Target Direction | in CS | "he3.Spin" in rootfile
    Long. Downstream +Z +1
    Long. Upstream -Z -1
    Trans LHRS side +X +1
    Trans BB side -X -1
    Under NMR -- 0

    FIGURE 1

    FIGURE 2