DPG 2004 Köln C. Schwarz

Particle Identification with the PANDA detector at GSI

C.Schwarz, GSI

DPG 2004 Köln C. Schwarz

Charged particle identification with PANDA

How to perform PID within a magnetic field in front of an EMC as compact as possible(material, costs)

DIRC

For p~GeV: SiO2 (n=1.47) Aerogel, C6F14 (n=1.02, 1.24)

target

B

DPG 2004 Köln C. Schwarz

Ring Imaging Cherenkov Detectors RICH

RICH DIRCDetectingInternallyReflectedCherenkov light

PID: tracking p, RICH m

pin point focus(camera obscura)

DPG 2004 Köln C. Schwarz

DIRC

less space than aerogelscosts of calorimeterno problems with field

Detecting Internally Reflected Č-light(exsting at BaBar)

10000 PMTs !

DPG 2004 Köln C. Schwarz

DIRC

K eff.

miss-id.

reaction pp at s = 3.6 GeV/c2

degree

degree

degr

ee

degr

eeK eff.

miss-id.

reaction pp at s = 3.6 GeV/c2

degree

degree

degr

ee

degr

ee

2/n=2.4pion =0.974547 photons

DPG 2004 Köln C. Schwarz

DIRC Time Of Propagation

T ,

T2

T1 (discussed at Belle)

reduced # of PMT for Kaon PID very good time resolution required (~ 100 ps)

DPG 2004 Köln C. Schwarz

Mechanical radiator quality

Edge losses

Edge thickn.

Sharpness of edges should be 50 m

Needs special care for handling

DPG 2004 Köln C. Schwarz

Mechanical support

quartz slabs embedded in honeycomb structure

DPG 2004 Köln C. Schwarz

Photon detector candidate: PMT-MCP

Photocathode

pixelized photoanode

MCP

glass tube

works up to 2.2 Teslaamplification up to 107 Anashin et al. NIMA 504 (2003) 276

DPG 2004 Köln C. Schwarz

Summary

● DIRC allows for compact PID● Simulations show good /K separation● Timing information might help to

reduce number of PMT● A possible photon detector is PMT-

MCP