Upgrade of the Proximity Focusing RICH at JLab

Size: px

Start display at page:

Download "Upgrade of the Proximity Focusing RICH at JLab"

Maude Day
6 years ago
Views:

1 Upgrade of the Proximity Focusing RICH at JLab E. Cisbani Istituto Superiore di Sanità and INFN Roma, Sanità group RICH October 2007, Trieste - Italy E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 1 / 26

2 JLab RICH People Istituto Superiore di Sanità and INFN Roma, Sanità group E. Cisbani, S. Colilli, F. Cusanno, S. Frullani, R. Frantoni, F. Garibaldi, F. Giuliani, M. Gricia, M. Lucentini, F. Santavenere University of Bari and INFN Bari A. Argentieri, R. De Leo, L. Lagamba, S. Marrone, E. Nappi Thomas Jefferson National Accelerator Facility A. Camsonne, R. Michaels, B. Reitz, J. Segal, C. Zorn ENEA Faenza E. Monno INFN Roma G.M. Urciuoli INFN Roma3 M. Iodice University of Maryland H. Breuer Funded by INFN (LEDA experiment) and JLab E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 2 / 26

3 Outline Introduction JLab RICH JLab facility Past: Original RICH version Performed experiment(s) Measured performance In progress: Upgraded RICH version Motivation: Transversity experiment Upgrade options and adopted solution Expected performance Summary and conclusion E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 3 / 26

4 Outline Introduction JLab RICH JLab facility Past: Original RICH version Performed experiment(s) Measured performance In progress: Upgraded RICH version Motivation: Transversity experiment Upgrade options and adopted solution Expected performance Summary and conclusion E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 3 / 26

5 Outline Introduction JLab RICH JLab facility Past: Original RICH version Performed experiment(s) Measured performance In progress: Upgraded RICH version Motivation: Transversity experiment Upgrade options and adopted solution Expected performance Summary and conclusion E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 3 / 26

6 Outline Introduction JLab RICH JLab facility Past: Original RICH version Performed experiment(s) Measured performance In progress: Upgraded RICH version Motivation: Transversity experiment Upgrade options and adopted solution Expected performance Summary and conclusion E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 3 / 26

7 Proximity Focusing JLab Conceptually identical to the Alice HMPID RICH 100 mm Proximity Gap Photosensitive Position Detector Cherenkov light cone Charged Particle Freon Radiator Container Quartz Window Drift Electrode E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 4 / 26

Proximity Focusing RICH @ JLab Conceptually identical to the Alice HMPID RICH 100 mm xim Pro it Photosensitive Position Detector Liquid Freon Inlet ap yg Bottom Side Charged Particle 180 cm 40 cm Ch

8 Proximity Focusing JLab Conceptually identical to the Alice HMPID RICH 100 mm xim Pro it Photosensitive Position Detector Liquid Freon Inlet ap yg Bottom Side Charged Particle 180 cm 40 cm Ch e ren ko v li gh tc on Quartz Spacer Quartz Window Neoceram e Liquid Freon Outlet Freon Radiator Container Quartz Window Radiator E. Cisbani (ISS - INFN Rome) Drift Electrode 15 mm thick Liquid Freon (C6 F14, n=1.28) RICH JLab RICH07-16/10/07 4 / 26

Proximity Focusing RICH @ JLab Conceptually identical to the Alice HMPID RICH 100 mm Proximity Gap Photosensitive Position Detector Cherenkov light cone Charged Particle Freon Radiator Container

9 Proximity Focusing JLab Conceptually identical to the Alice HMPID RICH 100 mm Proximity Gap Photosensitive Position Detector Cherenkov light cone Charged Particle Freon Radiator Container Quartz Window Drift Electrode Radiator Proximity gap 15 mm thick Liquid Freon (C 6 F 14, n=1.28) 100 mm, filled with Methane at STP E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 4 / 26

10 Proximity Focusing JLab Conceptually identical to the Alice HMPID RICH 100 mm Proximity Gap Photosensitive Position Detector Cherenkov light cone Charged Particle Freon Radiator Container Quartz Window Drift Electrode Radiator 15 mm thick Liquid Freon (C 6 F 14, n=1.28) Proximity gap 100 mm, filled with Methane at STP Photon converter 300 nm CsI film evaporated on each pad plane Position detector 3 pad plane = mm 2 Multi Wire/Pad Proportional Chamber, HV= V Pad Plane mm 2 (single pad: mm 2 ) E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 4 / 26

11 Proximity Focusing JLab Conceptually identical to the Alice HMPID RICH 100 mm Proximity Gap Photosensitive Position Detector Cherenkov light cone Charged Particle Freon Radiator Container Quartz Window Drift Electrode Radiator 15 mm thick Liquid Freon (C 6 F 14, n=1.28) Proximity gap 100 mm, filled with Methane at STP Photon converter 300 nm CsI film evaporated on each pad plane Position detector 3 pad plane = mm 2 Multi Wire/Pad Proportional Chamber, HV= V Pad Plane mm 2 (single pad: mm 2 ) FE Electronics analog chs, multiplexed S&H (Gassiplex) E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 4 / 26

Proximity Focusing RICH @ JLab Conceptually identical to the Alice HMPID RICH 100 it oxim r mp m Photosensitive Position Detector ap yg Charged Particle Photocatode and holder QE measurement system

12 Proximity Focusing JLab Conceptually identical to the Alice HMPID RICH 100 it oxim r mp m Photosensitive Position Detector ap yg Charged Particle Photocatode and holder QE measurement system 120 cm Crucibles Freon Radiator Container Quartz Window Radiator Proximity gap Photon converter Position detector Pad Plane FE Electronics Evaporation Fac. E. Cisbani (ISS - INFN Rome) Ch e ren ko v li gh tc on Photocatode cover e Drift Electrode 110 cm 15 mm thick Liquid Freon (C6 F14, n=1.28) 100 mm, filled with Methane at STP 300 nm CsI film evaporated on each pad plane 3 pad plane = mm2 Multi Wire/Pad Proportional Chamber, HV= V mm2 (single pad: mm2 ) analog chs, multiplexed S&H (Gassiplex) Cyl. vacuum chamber + Online QE measurement RICH JLab RICH07-16/10/07 4 / 26

13 The Continuous Electron Beam Accelerator Facility The high resolution and high luminosity (polarized) CEBAF electron beam: Current: up to 200 µa Energy: up to 6 GeV (12 GeV in 2012) Energy resolution (σ E /E): Duty factor: 100% (continuous beam) 3 Experimental halls: A, B and C JLab, Newport News (VA) E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 5 / 26

14 Hall A Detection Equipment Flexible detectors configuration depending on experiment 2 High Resolution Spectrometers (QQDQ) + 2 Septum Magnets (for angles down to 6 degrees) BigBite: High Acceptance Spectrometer HRS + Septum ϑ min = 6 ϑ φ 5 msr p = 4 GeV/c max dp/p = 5% 4 p/p ~ 10 (FWHM) Hadron Arm A1 A2 RICH The Hadron Arm Trigger: 2 scintillators Tracking: 2 Drift Chambers e-h PID: Gas Cherenkov Counter + Preshawer standard h-pid: 2 Aerogel Čerenkov (1.055 and for p/k + /π + on-line separation up to 2.2 GeV/c) Enhanced h-pid: Proximity focusing RICH E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 6 / 26

Hall A Detection Equipment Flexible detectors configuration depending on experiment 2 High Resolution Spectrometers (QQDQ) + 2 Septum Magnets (for angles down to 6 degrees) BigBite: High Acceptance

15 Hall A Detection Equipment Flexible detectors configuration depending on experiment 2 High Resolution Spectrometers (QQDQ) + 2 Septum Magnets (for angles down to 6 degrees) BigBite: High Acceptance Spectrometer HRS + Septum ϑ min = 6 ϑ φ 5 msr p = 4 GeV/c max dp/p = 5% 4 p/p ~ 10 (FWHM) Hadron Arm A1 A2 RICH The Hadron Arm Trigger: 2 scintillators Tracking: 2 Drift Chambers e-h PID: Gas Cherenkov Counter + Preshawer standard h-pid: 2 Aerogel Čerenkov (1.055 and for p/k + /π + on-line separation up to 2.2 GeV/c) Enhanced h-pid: Proximity focusing RICH E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 6 / 26

16 Introduction JLab RICH JLab facility Past: Original RICH version Performed experiment(s) Measured performance In progress: Upgraded RICH version Motivation: Transversity experiment Upgrade options and adopted solution Expected performance Summary and conclusion E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 7 / 26

17 Systematic study of hypernuclei by electromagnetic probe Electron Arm e Hadron Arm K + e p p 16 O 8 16 N 7 Λ n n 1p1/2 1p3/2 1s1/2 Λ Λ is a unique probe in the nucleus Λ can be in the s-shell (no Pauli blocking) Λ weakly coupled to nuclear core shell model works well Λ N potential: V ΛN = V + + s Λ + s N + T 9 Li Λ, 12 B Λ and 16 N Λ investigated Measure hypernucleus excitation energy to extract information on Λ N potential k-pid Requirement (Momentum 2 GeV/c) Signal ((e, e K) bound state) Hz Background (π and p mainly) larger than K Standard Hall A (A1 & A2) π:k rejection factor 1 : 100 1:10 at least still needed RICH! E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 8 / 26

18 Systematic study of hypernuclei by electromagnetic probe Electron Arm e Hadron Arm K + e p p 16 O 8 16 N 7 Λ n n 1p1/2 1p3/2 1s1/2 Λ Λ is a unique probe in the nucleus Λ can be in the s-shell (no Pauli blocking) Λ weakly coupled to nuclear core shell model works well Λ N potential: V ΛN = V + + s Λ + s N + T 9 Li Λ, 12 B Λ and 16 N Λ investigated Measure hypernucleus excitation energy to extract information on Λ N potential k-pid Requirement (Momentum 2 GeV/c) Signal ((e, e K) bound state) Hz Background (π and p mainly) larger than K Standard Hall A (A1 & A2) π:k rejection factor 1 : 100 1:10 at least still needed RICH! E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 8 / 26

19 Online Event display Charge particles mutiplicity (20% of events with 2 particles) rather clean event pattern E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 9 / 26

20 Original RICH performance at 2.0 ± 5% GeV/c Hyper. Exp. Data GEANT3 MonteCarlo Pretty good agreement between experimental data and MC: Mean Hits (for π): N PAD,π = 13 Angle resolution: σ θπ = 5 mrad θ π,k = 6σ θπ σθ EX π /σθ MC π 0.9 NPAD,π/N EX PAD,π MC 0.9 θ EX π,k / θ MC π,k 1.07 π/k rejection better than 1:1000 E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 10 / 26

21 Original RICH performance at 2.0 ± 5% GeV/c Hyper. Exp. Data GEANT3 MonteCarlo Pretty good agreement between experimental data and MC: Mean Hits (for π): N PAD,π = 13 Angle resolution: σ θπ = 5 mrad θ π,k = 6σ θπ σθ EX π /σθ MC π 0.9 NPAD,π/N EX PAD,π MC 0.9 θ EX π,k / θ MC π,k 1.07 π/k rejection better than 1:1000 E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 10 / 26

22 Kaon PID K by Aerogels K by [ Aerogels & RICH ] π p K K t2 t1 e K beam bunch structure e t2 t1 = t2 t1 = Time of Flight (FWHM 850 ps) Aerogels: (!A )&A RICH E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 11 / 26

Kaon PID Time of Flight (FWHM 850 ps) Aerogels: (!A 1.015 )&A 1.

23 Kaon PID Time of Flight (FWHM 850 ps) Aerogels: (!A )&A RICH Effect on Excitation Energy SNR E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 11 / 26

Pion rejection π by Aerogels 64656 events K by RICH 63 events 1 select pions by aerogels: A 1.015 &A 1.

24 Pion rejection π by Aerogels events K by RICH 63 events 1 select pions by aerogels: A &A Nπ AERO = then select K by RICH on the above sample N RICH K/π = 63 ns ns RICH Pion Rejection Factor > NRICH K/π Nπ AERO at 90 % efficiency 1:1000 Note: Measured Signal/Background rate meets optimistic expectation ( 10 times better than worst prediction) E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 12 / 26

25 Introduction JLab RICH JLab facility Past: Original RICH version Performed experiment(s) Measured performance In progress: Upgraded RICH version Motivation: Transversity experiment Upgrade options and adopted solution Expected performance Summary and conclusion E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 13 / 26

26 SIDIS Transversity Experiment Investigate the spin structure of the nucleon by: N (e,e h)x in DIS (E, k) (E N, p) DF x p (ν, q) σ γq (E, k ) F F (E h, p h) Kinematics DIS Region Q 2 = (ν, q) 2 M 2 ν lab = E E M x = Q 2 /(2Mν) > 0, < 1 z = E h /ν scale lepton probe strong interaction space / q 10 2 fm R N 1 fm time /ν s R N /c s (E X, p X) Factorization Theorem σ(en ehx ) q e2 q DF q (x) σ lq FF q h (z) DF q : quark Distribution Functions FF q h : quark Fragmentation Functions E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 14 / 26

27 k Dependent (TMD) Quark DF at Twist-2 Nucleon Quark 0 L T 0 f (x, k ) f 1T (x, k ) L g 1L (x, k ) g 1T (x, k ) T h 1 (x, k ) h 1L(x, k ) h 1T (x, k ) h 1T (x, k ) R R dk f (x, k ) unpolarized DF, very well measured R dk g 1L (x, k ) longitudianl DF, well measured dk (h 1T + k /(2M)h 2 1T ) Transversity DF, first evidence (leading order DF) f1t (x, k ) Sievers DF (info on quark angular momentum) E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 15 / 26

28 k Dependent (TMD) Quark DF at Twist-2 Nucleon Quark 0 L T 0 f (x, k ) f 1T (x, k ) L g 1L (x, k ) g 1T (x, k ) T h 1 (x, k ) h 1L(x, k ) h 1T (x, k ) h 1T (x, k ) Trasversity and Sievers investigated via Single Spin Asymmetry measurement by DIS on trasversely polarized target: A UT (φ l h, φl S ) = dσ dσ 2dσ A Collins UT sin(φ l h + φl S ) + ASivers UT sin(φl h φl S ) E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 15 / 26

29 Present Data HERMES(DIS06) on proton / COMPASS(ETC07) on deuteron K asymmetries look relevant No direct data on neutron E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 16 / 26

30 Present Data HERMES(DIS06) on proton / COMPASS(ETC07) on deuteron K asymmetries look relevant No direct data on neutron E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 16 / 26

31 Present Data HERMES(DIS06) on proton / COMPASS(ETC07) on deuteron K asymmetries look relevant No direct data on neutron E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 16 / 26

32 HERMES on p / COMPASS on d / JLab on neutron (proj. errors) 1 month data taking: statistical errors comparable to HERMES(3 years)/compass(2 years) E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 17 / 26

Transversity: Hall A Experimental Setup Beam 6 GeV, 15 µa e (target limit) Target High pressure polarized 3 He, 50 mg/cm 2, 42% polariz./20 min, Lumi 10 36 /s/cm 2 Electron Detection: BigBite E = 0.

33 Transversity: Hall A Experimental Setup Beam 6 GeV, 15 µa e (target limit) Target High pressure polarized 3 He, 50 mg/cm 2, 42% polariz./20 min, Lumi /s/cm 2 Electron Detection: BigBite E = GeV, θ = 30 o, Ω 64 msr Hadron Detection: HRS Left P h = 2.4 GeV/c, θ = 16 o, π/k ID Data taking 30 beam days, Summer 2008 Kinematic Region Q 2 = 2.2 GeV 2, x = , z 0.5 E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 18 / 26

34 RICH Upgrade Traaversity Requirement: π : K rejection 1:1000 at 2.4 GeV/c Upgrade Options Old RICH at 2.4 GeV/c: θ 4.1σ π : K 1 : New Radiator: from C 6 F 14 (n = 1.28) to C 5 F 12 (n = 1.24): lover index of refraction means smaller angles (improved photon acceptance), larger angular distance between kaon ad pion photons. Liquid freon re-circulation system to be modified C 5F 12 boils at 29 C more complex liquid radiator system C 5F 12 one of the worse greenhouse gases pure C 5F 12 is very expensive (isomeric mixture much cheaper... but transparency? 2 Larger photon detector (and longer gap): high photon acceptance, smaller geometric and digitization errors 1/2 of the detector structure must be rebuilt Additional electronics needed (we already have!) Upgrade is straightforward Costs and tight time schedule second option E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 19 / 26

35 RICH Upgrade Traaversity Requirement: π : K rejection 1:1000 at 2.4 GeV/c Upgrade Options Old RICH at 2.4 GeV/c: θ 4.1σ π : K 1 : New Radiator: from C 6 F 14 (n = 1.28) to C 5 F 12 (n = 1.24): lover index of refraction means smaller angles (improved photon acceptance), larger angular distance between kaon ad pion photons. Liquid freon re-circulation system to be modified C 5F 12 boils at 29 C more complex liquid radiator system C 5F 12 one of the worse greenhouse gases pure C 5F 12 is very expensive (isomeric mixture much cheaper... but transparency? 2 Larger photon detector (and longer gap): high photon acceptance, smaller geometric and digitization errors 1/2 of the detector structure must be rebuilt Additional electronics needed (we already have!) Upgrade is straightforward Costs and tight time schedule second option E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 19 / 26

36 Isomeric C 5 F 12 Freon Transparency cm Transmittance, QE and Convolution C6F14 clean Trans. C5F12 Trans. 5 mm Quartz Trans. C6F14 raw Trans. CsI Q.E. H2O Abs. (au) O2 Abs. (au) C6F14 a. (sum ) C5F12 (sum ) C6F14 b. (sum ) Iso-C 5F12 shows 1/2 the transmittance of clean C 6F 14 Air (H 2O) contamination in Iso-C 5F 12 sample looks significant (but does not explain full absorbtion) Transparency could improve with proper cleaning but not guaranteed Structure in transmittance may be related to other contaminats (?) Extrapolation may suggest 1/3 transmittance loss (respect to C 6F 14 after cleaning Wavelength νµ (Thanks to A. Bream for C 5 F 12 and A. Di Mauro for C 6 F 14 data) Iso-C 5 F 12 transparency requires further investigation (not compatible with experiment schedule) E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 20 / 26

37 Isomeric C 5 F 12 Freon Transparency cm Transmittance, QE and Convolution C6F14 clean Trans. C5F12 Trans. 5 mm Quartz Trans. C6F14 raw Trans. CsI Q.E. H2O Abs. (au) O2 Abs. (au) C6F14 a. (sum ) C5F12 (sum ) C6F14 b. (sum ) Iso-C 5F12 shows 1/2 the transmittance of clean C 6F 14 Air (H 2O) contamination in Iso-C 5F 12 sample looks significant (but does not explain full absorbtion) Transparency could improve with proper cleaning but not guaranteed Structure in transmittance may be related to other contaminats (?) Extrapolation may suggest 1/3 transmittance loss (respect to C 6F 14 after cleaning Wavelength νµ (Thanks to A. Bream for C 5 F 12 and A. Di Mauro for C 6 F 14 data) Iso-C 5 F 12 transparency requires further investigation (not compatible with experiment schedule) E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 20 / 26

38 RICH Upgrade Traaversity Requirement: π : K rejection 1:1000 at 2.4 GeV/c Upgrade Options Old RICH at 2.4 GeV/c: θ 4.1σ π : K 1 : New Radiator: from C 6 F 14 (n = 1.28) to C 5 F 12 (n = 1.24): lover index of refraction means smaller angles (improved photon acceptance), larger angular distance between kaon ad pion photons. Liquid freon re-circulation system to be modified C 5F 12 boils at 29 C more complex liquid radiator system C 5F 12 one of the worse greenhouse gases pure C 5F 12 is very expensive (isomeric mixture much cheaper... but transparency? 2 Larger photon detector (and longer gap): high photon acceptance, smaller geometric and digitization errors 1/2 of the detector structure must be rebuilt Additional electronics needed (we already have!) Upgrade is straightforward Costs and tight time schedule second option E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 21 / 26

39 RICH Upgrade Traaversity Requirement: π : K rejection 1:1000 at 2.4 GeV/c Upgrade Options Old RICH at 2.4 GeV/c: θ 4.1σ π : K 1 : New Radiator: from C 6 F 14 (n = 1.28) to C 5 F 12 (n = 1.24): lover index of refraction means smaller angles (improved photon acceptance), larger angular distance between kaon ad pion photons. Liquid freon re-circulation system to be modified C 5F 12 boils at 29 C more complex liquid radiator system C 5F 12 one of the worse greenhouse gases pure C 5F 12 is very expensive (isomeric mixture much cheaper... but transparency? 2 Larger photon detector (and longer gap): high photon acceptance, smaller geometric and digitization errors 1/2 of the detector structure must be rebuilt Additional electronics needed (we already have!) Upgrade is straightforward Costs and tight time schedule second option E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 21 / 26

40 From Original to Upgraded RICH The JLab RICH is a sandwich of several layers Preserve the radiator, entrance Al frames and grid plane Rebuild the last 3 Al frames + wires planes Use the same pad planes 90 rotated Obtain a photon detection area 1.6 larger than original... and 175 mm far from the radiator E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 22 / 26

From Original to Upgraded RICH The JLab RICH is a sandwich of several layers Preserve the radiator, entrance Al frames and grid plane Rebuild the last 3 Al frames + wires planes Use the

41 From Original to Upgraded RICH The JLab RICH is a sandwich of several layers Preserve the radiator, entrance Al frames and grid plane Rebuild the last 3 Al frames + wires planes Use the same pad planes 90 rotated Obtain a photon detection area 1.6 larger than original... and 175 mm far from the radiator E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 22 / 26

42 From Original to Upgraded RICH The JLab RICH is a sandwich of several layers Preserve the radiator, entrance Al frames and grid plane Rebuild the last 3 Al frames + wires planes Use the same pad planes 90 rotated Obtain a photon detection area 1.6 larger than original... and 175 mm far from the radiator E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 22 / 26

43 From Original to Upgraded RICH The JLab RICH is a sandwich of several layers Preserve the radiator, entrance Al frames and grid plane Rebuild the last 3 Al frames + wires planes Use the same pad planes 90 rotated Obtain a photon detection area 1.6 larger than original... and 175 mm far from the radiator E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 22 / 26

44 From Original to Upgraded RICH The JLab RICH is a sandwich of several layers Preserve the radiator, entrance Al frames and grid plane Rebuild the last 3 Al frames + wires planes Use the same pad planes 90 rotated Obtain a photon detection area 1.6 larger than original... and 175 mm far from the radiator E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 22 / 26

45 Upgraded Proximity Focusing JLab Radiator 15 mm thick Liquid Freon (C 6F 14, n=1.28) Proximity Gap 100 mm, filled with Methane at STP Photon converter 300 nm CsI film coated on Pad Planes Position Detector 3 pad planes = mm 2 Multi Wire/Pad Proportional Chamber, HV= V Pad Plane mm 2 (single pad: mm 2 ) FE Electronics analog chs, multiplexed S&H E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 23 / 26

46 Upgraded Proximity Focusing JLab Radiator 15 mm thick Liquid Freon (C 6F 14, n=1.28) Proximity Gap mm, filled with Methane at STP Photon converter 300 nm CsI film coated on Pad Planes Position Detector 3 5 pad planes = mm 2 Multi Wire/Pad Proportional Chamber, HV= V Pad Plane mm 2 (single pad: mm 2 ) FE Electronics analog chs, multiplexed S&H E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 23 / 26

47 RICH Upgrade: FEM Analysis Max distorsions < 0.02 mm E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 24 / 26

48 RICH Upgrade: Simulated performance Montecarlo tuned with real data on original RICH Expected rejection < 1 : 1000 π:k in whole acceptance E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 25 / 26

49 Summary and conclusion Original RICH operated succesfully in Hypernuclear (and Pentaquark) experiment in Hall A at JLab, providing π:k rejection better than 1:1000 at 2.0 GeV/c New - high rank - experiment on transverse spin structure of the nucleon demands for similar rejection at 2.4 GeV/c Two upgrade options (providing similar performance) have been considered: 1 new liquid freon (C 5F 12, lower refractive index) 2 extend the photon detector area The latter option has been selected due mainly to higher cost of the C5F 12 freon (and uncertainty in transmittance) time schedule of the experiment does not allow significant R&D 1π in more than 1000 identified K predicted by Montecarlo tuned on real data (at 90% efficiency) Upgrade is in progress: new detector expected for the end of 2007 New RICH will operate in transversity experiment in summer 2008 E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 26 / 26

50 Summary and conclusion Original RICH operated succesfully in Hypernuclear (and Pentaquark) experiment in Hall A at JLab, providing π:k rejection better than 1:1000 at 2.0 GeV/c New - high rank - experiment on transverse spin structure of the nucleon demands for similar rejection at 2.4 GeV/c Two upgrade options (providing similar performance) have been considered: 1 new liquid freon (C 5F 12, lower refractive index) 2 extend the photon detector area The latter option has been selected due mainly to higher cost of the C5F 12 freon (and uncertainty in transmittance) time schedule of the experiment does not allow significant R&D 1π in more than 1000 identified K predicted by Montecarlo tuned on real data (at 90% efficiency) Upgrade is in progress: new detector expected for the end of 2007 New RICH will operate in transversity experiment in summer 2008 E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 26 / 26

51 Summary and conclusion Original RICH operated succesfully in Hypernuclear (and Pentaquark) experiment in Hall A at JLab, providing π:k rejection better than 1:1000 at 2.0 GeV/c New - high rank - experiment on transverse spin structure of the nucleon demands for similar rejection at 2.4 GeV/c Two upgrade options (providing similar performance) have been considered: 1 new liquid freon (C 5F 12, lower refractive index) 2 extend the photon detector area The latter option has been selected due mainly to higher cost of the C5F 12 freon (and uncertainty in transmittance) time schedule of the experiment does not allow significant R&D 1π in more than 1000 identified K predicted by Montecarlo tuned on real data (at 90% efficiency) Upgrade is in progress: new detector expected for the end of 2007 New RICH will operate in transversity experiment in summer 2008 E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 26 / 26

52 Summary and conclusion Original RICH operated succesfully in Hypernuclear (and Pentaquark) experiment in Hall A at JLab, providing π:k rejection better than 1:1000 at 2.0 GeV/c New - high rank - experiment on transverse spin structure of the nucleon demands for similar rejection at 2.4 GeV/c Two upgrade options (providing similar performance) have been considered: 1 new liquid freon (C 5F 12, lower refractive index) 2 extend the photon detector area The latter option has been selected due mainly to higher cost of the C5F 12 freon (and uncertainty in transmittance) time schedule of the experiment does not allow significant R&D 1π in more than 1000 identified K predicted by Montecarlo tuned on real data (at 90% efficiency) Upgrade is in progress: new detector expected for the end of 2007 New RICH will operate in transversity experiment in summer 2008 E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 26 / 26

53 Summary and conclusion Original RICH operated succesfully in Hypernuclear (and Pentaquark) experiment in Hall A at JLab, providing π:k rejection better than 1:1000 at 2.0 GeV/c New - high rank - experiment on transverse spin structure of the nucleon demands for similar rejection at 2.4 GeV/c Two upgrade options (providing similar performance) have been considered: 1 new liquid freon (C 5F 12, lower refractive index) 2 extend the photon detector area The latter option has been selected due mainly to higher cost of the C5F 12 freon (and uncertainty in transmittance) time schedule of the experiment does not allow significant R&D 1π in more than 1000 identified K predicted by Montecarlo tuned on real data (at 90% efficiency) Upgrade is in progress: new detector expected for the end of 2007 New RICH will operate in transversity experiment in summer 2008 E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 26 / 26

54 Summary and conclusion Original RICH operated succesfully in Hypernuclear (and Pentaquark) experiment in Hall A at JLab, providing π:k rejection better than 1:1000 at 2.0 GeV/c New - high rank - experiment on transverse spin structure of the nucleon demands for similar rejection at 2.4 GeV/c Two upgrade options (providing similar performance) have been considered: 1 new liquid freon (C 5F 12, lower refractive index) 2 extend the photon detector area The latter option has been selected due mainly to higher cost of the C5F 12 freon (and uncertainty in transmittance) time schedule of the experiment does not allow significant R&D 1π in more than 1000 identified K predicted by Montecarlo tuned on real data (at 90% efficiency) Upgrade is in progress: new detector expected for the end of 2007 New RICH will operate in transversity experiment in summer 2008 E. Cisbani (ISS - INFN Rome) RICH JLab RICH07-16/10/07 26 / 26

A proximity focusing RICH detector for kaon physics at Jefferson lab hall A

Nuclear Instruments and Methods in Physics Research A 502 (2003) 117 122 A proximity focusing RICH detector for kaon physics at Jefferson lab hall A F. Garibaldi a, *, E. Cisbani a, S. Colilli a, F. Cusanno