carsten schwarz panda june 2004 cid cherenkov imaging detectors ● rich software at hermes, ralf...

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