Sep. 2, 2007
JPARC TREK Collaboration meeting at Saskatchewan
Comment for
target fiber size
fiber size is to be determined.
•
Target size is fixed to be f75.
•
From this value, segmentation of fiber is
uniquely determined.
s [K+ stopping pos. (hit-track) ]
Km3
= √ s [rdiff ]2 + s [tdiff ] 2
rdiff = K+ stopping pos. (true-hit)
(determined by fiber size)
tdiff = K+ stopping pos. (true-track)
(determined by target radius and GEM trackers)
phi 100
0.12 cm
in RMS
tdiff
•
If RMS of rdiff is fixed, adequate fiber size is
determined ~3mm.
rdiff
• RMS of tdiff is to be 0.1 cm from target size f75.
 s(rdif) should be comparable to s(tdif)
phi 60
0.07 cm
in RMS
tdiff