LEPS Collaboration Meeting in Taiwan
Update of TPC Analysis (II)

Jia-Ye Chen

2006.1.12

Contents

Time Projection ChamberParticle IdentificationGet Pulses and Form ClustersSet Hits and Find Track CandidatesLayer-Clustering (0.46-rk) and Wire-Clustering (0.47b)Wire-Clustering AlgorithmFuture Work

Time Projection Chamber

Particle Identification Algorithm

Pulses(Flash ADC)

Form Clusters

Set Hits

Find Track Candidates

Obtain Flight Length and Momentum

Get Pulses and Form Clusters

Get PulseForm Cluster

Set Hits and Find Track Candidates

Set Hits (0.46)Find Track Candidates

2D

3D

Hit Position

Layer-Clustering
and Wire-Clustering

Layer Wire

Layer Clustering
R32273 Event 1 Layer 0

Layer Clustering
R32273 Event 1 Layer 1

Wire Pulses
R32273 Event 1

Wire Clustering
R32273 Event 1

Same Layer

Cross Layer

Wire Clustering
R32273 Event 1 Wire 50

Find Track Candidate

0.46 W/O CorrectHit
0.47 W/O Tracking Raw Hits

R32273 Event 1
Raw Hits and Tracking Hits

Tracking Hits

Raw Hits

x

x

y

y

Double-Counted Hits

x

y

z

x

y

z

Transverse : x and y Longitudinal : z

Hits Separation

dx

dy

dz

dx

dy

dz

dx

dy

dz

(mm)

Pile-up Pulses

Z

Wire-Clustering Algorithm

High ADC pulse as SEEDFind Time-Overlapped pulses on the same or neighboring layers, if time-overlapped pulses on the same layer, ask for neighboring pads.A cluster requires that more than 3 pulses and 3 pads.Hits which their separation, Z, is smaller than 1 mm, are double-counted hits. Small max-ADC hit will be dropped.

Tracking Enhancement

1 hit per layer per track

More than 1 hit per layer per track

Future Work

To merge Layer-Clustering and Wire-Clustering.To extend tracking algorithm, # of hits per tracks will greater than 14.Hope : Kick event

Pulses

(Flash ADC)

Form Clusters

Set Hits

Find Track Candidates

Obtain Flight Length

and Momentum

)

(

434

.

4

cm

c

=

t

+

+

-

+

+

-

+

+

+

+

+

+

S

+

L

+

K

n

K

K

p

p

p

p

g

1405