From: Djamel Ouerdane (ouerdane@nbi.dk)
Date: Thu Feb 20 2003 - 18:59:26 EST
Hi again, Sorry to bother the list with not very pleasant things but it's better to discover them and share the info, isn't it :) Peter showed some H1 efficiency plots where strange features were noticeable. I have found at least the source of one, namely the worse efficiency for the first slats (1 to 4 or 5). If you go there : http://www.nbi.dk/~ouerdane/cal/weirdtof.html you'll see what I mean. The first plot shows the difference in X between tof hits and FFS track intersection with the hodoscope plane versus the slat number. The dashed lines show the cut we usually apply. There's a geometry issue for these slats. It comes either from T2 tracks or from the real location of the slats. I would think it comes from T2. Any suggestion for correcting such a thing ? Djam -- Djamel Ouerdane ------------------------------------------o | Niels Bohr Institute | Home: | | Blegdamsvej 17, DK-2100 Ø | Jagtvej 141 2D, | | Fax: +45 35 32 50 16 | DK-2200 Copenhagen N | | Tel: +45 35 32 52 69 | +45 35 86 19 74 | | http://www.nbi.dk/~ouerdane | | ouerdane@nbi.dk | o---------------------------------------------------------o
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