T585 analysis status 32006/2/2

HIDEYUKI SAKAMOTO

Contents• On small light yield problem checked by Aron’s information

• Tracking status

• Transverse and Longitudinal momentum distribution

• Comparison of DATA with MC

• Photo electron distribution

• Next to do

P.E as a function of waveguide

This shows that

The problem has also at station side .

From Aron’s check

Track reconstruction -- This is last talk• Based on Uniform B-Field and NO scattering• Chi2 to be minimized

– Input: xi,yi, i=1,4– Output: x0,y0,p0,R,L– Degree of freedom: 8-5=3

2

2fiti

2

2fiti

i

2 )y(y)x(x

]/LRcos[zxx 0ifit 0

/(0.3B)p R T

/(0.3B)p L L

]/L[zRsin yy 0ifit 0 x0, y0

0

#4#3

#2

#1R

Checking of tool -- This is last talk• Input = hit position by GEANT

Vertical: residual (%)

Horizontal: fit parameters

Transverse momentum (pt)

Longitudinal momentum (pz)

MC v.s. reconstructed pt & pz-- This is last talk

MC

Reconst.

Why is Reconst. longitudinal momentum so broad?

•Bug?

•Effect of scattering?

NOW checking this.

Broadness of fitted Pz

• This problem occurs when turning angle, becomes small– z L -1 = z 0.3 B Pz -1 – Small Small B or Large Pz

• In MICE– B=4T,Pz=200MeV/c L=17cm => (z=1m)=337d

eg <= NO Problem

• In T585– B=1T,Pz=400MeV/c..etc.. 1/8 times as MICE=42deg– For analysis, using TOF for Pz reconstruction

#1

#2

#3#4

Event display – MC –

x=0

True

With x

Fitted

Pz=416MeV/c

z=95cm)=39 deg

UpdatedSetup of fiber sheet for MC• Scifi.

– Diameter=350um=>(#)core:350umx94%=>(#)clad:350umx6%

– Pitch=420um– Distance=280um– Material=scinti.

=>(#)core:scinti.(Polythylene)=>(#)clad:PMMA

(#) from Kuraray catalogue• View

– Distance=0.63mm– Material=Air

=> polyurethane adhesive(PSILRA1000) (temporary)

• Mylar– Thickness=25um– Material=(Polyethylene terephthalate) [C10

H8]n

0.4

2m

m0.3

5m

m0.2

8

mm

0.63mm+25um

Sta

tion

Bod

yMylar

X W V

Filled withAdhesive

Difference for View material

There is no significant difference because input momentum is 3GeV/c pion, MIPS

Deposit energy

E1

E2

E3

E4

E5

E4+ E5

E1, E2

E3

E1+E2

E4+ E5

E4+ E5E3

E3

3GeV/c pion

L1A cut

L1A & residue

cut

Photo electron distribution –DATA—

Timing(L1A) Residual

cm

RUN#1255

STATION1

X-VIEW

!! NO CLUSTERING

DATA

Photo electron distribution – MC–

Distributed by POISSON and Gausian

Calibrated by eye (w/o fit)

MC

MCDATA

Station 1 X-VIEW (with Adhesive and Mylar)

!! NO CLUSTERING

Next to do

• Mapping– stopped for while..+My Request (as said e-mail to Aron)“Checking scifi alignment with my modified list”, making after checking by beam DATA.

• Tracking– Reconstruction using TOF for T585 analysis– Estimating errors of reconst. Momentums

• ADC distribution– Including “clustering”– Adjusting : Eye => Fitting