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RICH simulation for CLAS12 Contalbrigo Marco INFN Ferrara Luciano Pappalardo INFN Ferrara Hall B Central Detector Forward Detector M. Contalbrigo1 JLAB12.

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Presentation on theme: "RICH simulation for CLAS12 Contalbrigo Marco INFN Ferrara Luciano Pappalardo INFN Ferrara Hall B Central Detector Forward Detector M. Contalbrigo1 JLAB12."— Presentation transcript:

1 RICH simulation for CLAS12 Contalbrigo Marco INFN Ferrara Luciano Pappalardo INFN Ferrara Hall B Central Detector Forward Detector M. Contalbrigo1 JLAB12 coll. Meeting 17 March 10

2 RICH detector Substitute 2 LTCC sectors with a proximity focusing RICH detector 3 cm 80 cm GeV /c 12345678910  /K TOF LTCC HTCC  /p TOF LTCC HTCC K/p TOF LTCC  ratio K/  ~ 0.1-0.15 M. Contalbrigo2JLAB12 coll. Meeting 20Oct09

3 M. Contalbrigo3JLAB12 coll. Meeting 18 Nov 09 Pad size 2 cm Pad size 0 cm VISIBLE light Pad size 2 cm UV+VIS light UV light That’s the way ! Reduce pad size

4 M. Contalbrigo4 JLAB12 coll. Meeting 17 March 10 Aerogel Npe> 5 C 6 F 14 UV C 6 F 14 VISIBILE 38 3 8 3 8 3 8 3 8 3 8 3 8 Not so bad with < 1 cm pad

5 M. Contalbrigo5 JLAB12 coll. Meeting 17 March 10 Try to reduce active area

6 M. Contalbrigo6 JLAB12 coll. Meeting 17 March 10 TOF Direct measurement in a restricted area RICH FTOF Beam 5o5o 35 o 25 o 10 o

7 M. Contalbrigo7 JLAB12 coll. Meeting 17 March 10 3 8 3 8 3 8 3 8 3 8 3 8 3 8 Aerogel Npe> 5 C 6 F 14 UV C 6 F 14 VISIBILE

8 M. Contalbrigo8 JLAB12 coll. Meeting 17 March 10 3 8 3 8 3 8 3 8 3 8 3 8 3 8 C 6 F 14 UV C 6 F 14 VISIBILE

9 M. Contalbrigo9JLAB12 coll. Meeting 20Oct09 Less photons Larger angle separation

10 M. Contalbrigo10 JLAB12 coll. Meeting 17 March 10 3 8 3 8 3 8 3 8 3 8 3 8 3 8 Aerogel Npe> 5 C 6 F 14 UV C 6 F 14 VISIBILE HERMES like Aerogel

11 M. Contalbrigo11 JLAB12 coll. Meeting 17 March 10 3 8 3 8 3 8 3 8 3 8 3 8 3 8 C 6 F 14 UV C 6 F 14 VISIBILE

12 M. Contalbrigo12 JLAB12 coll. Meeting 17 March 10 3 8 3 8 3 8 3 8 3 8 3 8 3 8 Aerogel Npe> 5 C 6 F 14 UV C 6 F 14 VISIBILE

13 M. Contalbrigo13 2005 IEEE Nuclear Science Symposium Conference Record M. Tabata et al. JLAB12 coll. Meeting 17 March 10 Trasmission length is undergoing significantly improvements

14 M. Contalbrigo14 JLAB12 coll. Meeting 17 March 10

15 M. Contalbrigo15 JLAB12 coll. Meeting 17 March 10 5 8 5 8 5 8 Aerogel Npe> 3

16 M. Contalbrigo16 JLAB12 coll. Meeting 17 March 10 5 8 5 8 5 8 Aerogel Npe> 3

17 M. Contalbrigo17 Increasing n reduces angle difference Reducing thickness improves small pad response JLAB12 coll. Meeting 17 March 10 5 8 5 8 5 8 Aerogel Npe> 3 At large thickness uncertainty from gamma starting point

18 M. Contalbrigo18 JLAB12 coll. Meeting 17 March 10 5 8 5 8 5 8

19 M. Contalbrigo19 JLAB12 coll. Meeting 17 March 10 5 8 5 8 5 8

20 M. Contalbrigo20 JLAB12 coll. Meeting 17 March 10 Full ring catched if down to 50 cm from beam line Asymmetric illuminiation (due to 5 T solenoid) suggests better to use multi sectors

21 M. Contalbrigo21 Geometry costraints: minimum radius down to 50 cm from beam line left-right symmetry increase number of sectors JLAB12 coll. Meeting 17 March 10 5 8 5 8 5 8 Npe > 5 ! Weak sensitivity on: reduction of active area down to 17 o minimum N p.e.

22 M. Contalbrigo22 Going down to 50 cm & Left-right asymmetry increases efficiency JLAB12 coll. Meeting 17 March 10 5 8 5 8 5 8

23 M. Contalbrigo23 JLAB12 coll. Meeting 17 March 10 5 8 5 8 5 8

24 Executive summary RICH with Aerogel matches the required performances High cost due to the Large surface Expensive detectors for visible light Small pad size required Interference with TOF Material budget Crucial to minimize detector area material budget M. Contalbrigo24 JLAB12 coll. Meeting 17 March 10

25 M. Contalbrigo25 JLAB12 coll. Meeting 17 March 10 TOF Reflect on a side reflected does not reduce detector area hard to find a focusing geometry conflict with toroid field direct photons impinge at large angles

26 M. Contalbrigo26 JLAB12 coll. Meeting 17 March 10 TOF Reflect inside Reflect outside direct & reflected direct Low material budget Low material budget Direct: high momentum high performance Reflected: lower momentum relax performance requests

27 M. Contalbrigo27 JLAB12 coll. Meeting 17 March 10 TOF REFLECTED BY MIRROR DIRECT DETECTION RICH

28 M. Contalbrigo28 JLAB12 coll. Meeting 17 March 10 TOF RICH REFLECTED RICH DIRECT

29 M. Contalbrigo29 Beam 5o5o 35 o 25 o 20 o 10 o Photon detector Minimize interference with FTOF Decouple RICH optics Simplify reconstruction Doubled detector area Focusing mirrors to reduce detector area to ~ 2 m 2 /sec Relax performance requests for the external half (lower p) Increase pad size Reduce channel number Standard PMTs Similar to i.e. LHC-b !!! Focalizing mirror JLAB12 coll. Meeting 17 March 10

30 M. Contalbrigo30 Beam 5o5o 35 o 25 o 20 o 10 o Photon detector Minimize detector area (~1 m 2 /sector) interference with FTOF High density of hits check with track multiplicity Too high absorption in aerogel semi-reflective mirror Reduced collection efficiency (bi-alcali q.e. 25 %) ultra bi-alcali q.e. 45 % cost increases by 50 % Semi-reflective mirror New concept !!! JLAB12 coll. Meeting 17 March 10

31 Executive summary RICH with Aerogel matches the required performances Ongoing: Genaralize reconstruction algorithm to treat multiple track events mirrors Optimize mirror geometry minimize detector area minimize interference with TOF Working to minimize detector area material budget M. Contalbrigo31 JLAB12 coll. Meeting 17 March 10

32 Simulation based on most conservative n (Moyssdes) M. Contalbrigo32JLAB12 coll. Meeting 20Oct09

33 Quartz absorption length and refraction index from Khashan and Nassif, Optic communications 188 (2001) 129 M. Contalbrigo33JLAB12 coll. Meeting 20Oct09

34 M. Contalbrigo34 Beam 5o5o 35 o 25 o 20 o 10 o Photon detector Minimize interference with FTOF Decouple RICH optics Simplify reconstruction Doubled detector area Relax requests for the external half Increase pad size Reduce channel number Standard PMTs Similar to LHC-b !!! Focalizing mirror JLAB12 coll. Meeting 17 March 10

35 M. Contalbrigo35 Beam 5o5o 35 o 25 o 20 o 10 o Photon detector Minimize detector area (~1 m 2 /sector) interference with FTOF High density of hits check track multiplicity Too high absorption in aerogel semi-reflective mirror Reduced collection efficiency (bi-alcali q.e. 25 %) ultra bi-alcali q.e. 45 % cost increases by 50 % Semi-reflective mirror New concept !!! JLAB12 coll. Meeting 17 March 10

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