Development of Silicon Strip Detector for the measurement

of Ξ-atom X-raysHitoshi SugimuraKyoto University

(For E03 collaboration)

SNU Kiyoshi Tanida Ryuta Kiuchi Joo Chang Woo JAEA Ken’ichi Imai Hiroyuki Sako Susumu Sato KyotoU Hitoshi Sugimura Satoshi Adachi Hidemitsu Asano RCNP Tomoaki Hotta

Collaborators

J-PARC E03 experiment

Fe

K- K+

1.8GeV/cp

FeΞ-

X-ray

Ge-Detector

drrUrE )(|)(|2

Strong Interaction makes Energy Shift

We detect X-ray from Ξ-atom by using Ge-detector for the first time.Energy shift provides information of ΞN interaction.

Fe

Ξ-

J-PARC E03 experiment

Fe

K- K+

1.8GeV/cp

Fe

Ξ-

FeΞ-

X-ray

Ge-Detector

drrUrE )(|)(|2

Strong Interaction makes Energy Shift

1-step ,We detect X-ray by using Ge-detector.How to detect X-ray from xi atom is first challenge And 2-step make sure that how much energy shift. Make us information to ΞA interaction

Expected Energy Shift (Simulation)

Detector Set up

Target

SSD

SSD

SSD measures Ξ track and dE/dx to select slow Ξ so that better S/N ratio will be obtained for stopping Ξ.

K-

K+

KURAMA magnetHyperball-J

target

K-

Thickness ~300um

Effective area 6cmx6cm

Pitch 80um x 768 strips

Read out chip : APV25

128ch readout /1chip

Shaping time 50nsec

Serial Data Transfer

Radiation tolerance checked

up to 3x1014protons /cm2

At 108Hz beam, efficiency is

accomplished up to 96%

Silicon Strip Detector (SSD)

K

計 12 面　 768ch

Beam Test at J-PARC K1.8 beamline

SSDSSD SSD

Target (inside of cryostat)

Wave analysis

Time resolution and S/N

•Reconstruct pulse height by wave form analysis.

We have achieved SNR>10

MIP signalNoise level

S/N=

=17.0

•Reconstruct Hit Timing

If 107Hz beam , probability accidental hit is 13.6% Good enough to identify ghost tracks.

σ=3.61ns

σ=3.61ns

time

S/N

SSD has been developed for E03 which detect X-ray from Xi atom for the first time .

SSD has been tested at J-PARC K1.8 beamline.

We have obtained S/N = 17 and time resolution is 3.61ns which is sufficient for E03 experiment.

Summary

Back up

　 Hyperball-Ja new Ge detector array

Hyperball2 ( ε ~4 % for 1 MeV)can not be used @J-PARCdue to high count rate & radiation damage

→ Need new Ge detector array

Lower half of Hyperball-J

PWO counterGe detector

Pulse-tube cooler

Target

Features Radiation-hard Ge detector

→ Mechanical cooling

Fast background suppressor → PWO counter

Pulse-shape readout and analysis

Adjustable detector geometry

Large photo-peak efficiency → ε ~6.1 % @1 MeV with 32 Ge detectors

Remotely controlled and monitored

K1.8 beamline for KURAMA setup

Raw Signal

signal