Upload
bonnie-morrison
View
213
Download
0
Embed Size (px)
Citation preview
Carsten Schwarz PANDA June 2004
CID Cherenkov Imaging Detectors
● RICH software at HERMES, Ralf Kaiser, Glasgow● Present status of DIRC, C.S., GSI● Spiralling electrons, Klaus Föhl, Edinburgh● ...
Carsten Schwarz PANDA June 2004
Present status of DIRC
● GSI Design proposal● Working principle (BaBar)● TOP (Belle)● Photondetectors● TR
Carsten Schwarz PANDA June 2004
GSI Design Proposal (CID)
PANDA: Spokesperson: Jim Ritman, Deputy: Guenther Rosner
PANDA1 (CID): Leading Part.: GSI, Task Coordinator: C.S.
2.280 TEuro
430 TEuro
RICH:
Glasgow Guenther Rosner 163 TEEdinburgh Klaus Foehl 20 TE
DIRC:
Darmstadt C.S. 173 TE
Mainz Josef Pochodzalla 49 TE
Vienna Johann Marton 25 TE
Carsten Schwarz PANDA June 2004
Ring Imaging Cherenkov Detectors RICH
RICHfocus orproximity focusing
DIRCDetectingInternallyReflectedCherenkov light
PID: tracking p, RICH m
pin point focus(camera obscura)
CIDCherenkov Imaging Detectors
Carsten Schwarz PANDA June 2004
Charged particle identification with DIRC
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
Carsten Schwarz PANDA June 2004
DIRC
less space than aerogelscosts of calorimeterno problems with field
Detecting Internally Reflected Č-light(exsting at BaBar)
10000 PMTs !
Carsten Schwarz PANDA June 2004
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
ee2/n=2.4pion =0.974547 photons
Carsten Schwarz PANDA June 2004
Mechanical radiator quality
Edge losses
Edge thickn.
Sharpness of edges should be 50 m
Needs special care for handling
Carsten Schwarz PANDA June 2004
T ,
T2
T1
(discussed at Belle)
reduced # of PMT for Kaon PID very good time resolution required (~ 100 ps)
DIRC-TOP Time Of Propagation
Carsten Schwarz PANDA June 2004
Mechanical support
quartz slabs embedded in honeycomb structure
Carsten Schwarz PANDA June 2004
Photon detector test
ALADIN magnet
MCP-PMBurlePlanacon 85001-501
Carsten Schwarz PANDA June 2004
Micro Channel Plate PM Planacon 85001-501, Burle
Photocathode
pixelized photoanode
MCP
glass tube
Carsten Schwarz PANDA June 2004
Micro Channel Plate PM Planacon 85001-501, Burle
light: LED
Carsten Schwarz PANDA June 2004
Photon detector candidate: PMT-MCP
Photocathode
pixelized photoanode
MCP
glass tube
works up to 2.2 Teslaamplification up to 107
fast: 0.1 ns
Anashin et al. NIMA 504 (2003) 276
pores: 9 m
Carsten Schwarz PANDA June 2004
DIRC Topics for Technical Report
● Geometry of slabs
– 17 x 30– 10 x 30– 5 x 30 mm2
– 10 x 120– 10 x 240 mm2
● Cherenkov angle resolution C
– tracking (photon det.)– dispersion (#ph)– transport
BA
BA
RT
OP
Carsten Schwarz PANDA June 2004
RICH topics for Technical Report
● Thickness of radiator(s)
– #ph vs. Rayleigh scattering● Refractive index
● Cherenkov angle resolution C