Status of silicon strip detector Efficiency Position Resolution

Status of silicon strip detector ・Efficiency ・Position Resolution ・Absolute value of charge 2003/03/13 Manabu Togawa Kyoto-Univ.

Efficiency • Use data we took @KEK • First, I track using 4 sensors except one which I want to research efficiency. • Efficiency is defined as Effi=(N of hits is found at Si(i) near track line* ) /(N of tracking except Si(i)) *resion is ± 500µm from track line

Efficiency Si number efficiency Error (±) 2(250 um) 61. 45 1. 91 3(400 um) 96. 41 2. 87 4(400 um) 98. 23 2. 88 5(400 um) 87. 29 2. 66 6(250 um) 58. 33 1. 82

Position Resolution • For estimate position resolution, I use geant 3 (study multiple scattering and geometry). • Then, put intrinsic position resolution as gaussian(first, all 23 um), and using histogram fit. Black : silicon (250 u or 400 u) Yellow and blue : alminized mylar (20 u+80 u) Green : plastic scinti. Space : Air Beam Pi+

Position Resolution (Residual@exp) 0. 05201 0. 03568 0. 04549 Number is sigma value 0. 03538 0. 04948

Position Resolution (Residual@simulation only) 0. 03807 0. 01562 0. 01634 0. 03652 0. 03706

Position Resolution (Residual@sim+position resolution) 0. 05295 0. 03621 0. 03588 0. 05166 0. 04621 Si Position Resolution(um) 2 26. 37 3 25. 01 4 24. 38 5 26. 15 6 23. 52

Absolute value of charge • About estimation (only Si#9 400 um) ¥ : From 1 MIP test mode of VA 2, ~64 ch is 22400 e- (VA 2 specification). ¥ : Cluster information: x : ~82 ch u : 112 ch -> (82+112) / 64 * 22400 ~ 67000 e. We expect ~ 44000 e$ : d. E/dx~1. 7 Me. V(g-1 cm 2) @ 1. 05 Ge. V/c pi+ $ : density ~ 2. 33(g/cm 3) $ : energy of 1 (e/h) pair creation ~ 3. 6 Me. V Problem of test mode or …. Now I don’t understand.

To do @efficiency debug(? ) to Si#5. @position resolution Survey alminized mylar and do error estimation. @Absolute value of charge To understand charge value, check systematic. (test mode or noise or … etc. )