TPC drift velocities

From: Ian Bearden (bearden@nbi.dk)
Date: Thu Jan 23 2003 - 04:01:23 EST

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    Hi,
    I have been trying to figure out what gives a better result for tracking:
    the DVMs or the PHC-EJK tracking.  For runs around 7300-7500, PHC and EJK
    find drift velocities around 1.8 for T1, whereas the DVM says 1.6.  The
    track matching is certainly much better for 1.6 (in both T1 and T2, as DVMs
    indicate) than for 1.8.
    
    I looked this morning and saw that the DVMs now also say 1.8(ish) for
    TPM2,T1 and T2.
    There is what looks at a glance to be a fairly abrupt change between runs
    7544 adn 7564.  Does anyone know why this might have happened?  Could an
    expert look into this?
    
    Cheers,
    Ian
    
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    | I.G. Bearden                                                       |
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