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