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    User name jpchen

    Log entry time 11:28:16 on May 9,2003

    Entry number 101071

    keyword=thin sieve in, long 12C foil at 10 cm upstream

    Since Nilanga did not see clearly the hole patterns above background for 12C foil at 20 cm upstream (they are good for 12C at center and at 20 cm downstream), we decided to do one more study with 12C at 10 cm upstream (with deltaP/P at +3, 0 and -3%). We made an access (during beam study time) to change configuration:
    1) Took out thick sieve, put in thin sieve slits;
    2) Took out the target collimators;
    3) Switched long 12C foil with the short one at 10 cm upstream, so now we have
    long at 10 cm upstream, two short ones at center and 10 cm downstream.
    We will take data with EMPTY, single 12C foil at -10 cm and 3 foils.