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Title: RICH detector at Jefferson Lab, design, performance and physics results

Abstract

Since 2004 the hadron spectrometer of Hall A at Jefferson Lab is equipped with a proximity focusing RICH. This detector is capable of identify kaon from pion and proton with an angular separation starting from 6 sigma at 2 GeV/c. The RICH design is conceptually similar to the ALICE HMPID RICH; it uses a C6F14 liquid radiator and a 300 nm layer of CsI deposited on the cathode pad plane of an asymmetric MWPC. The RICH has operated for the Hypernuclear Spectroscopy Experiment E94-107, which took data in the last two years. Design details and performance along with first physics results from the hypernuclear experiment are shortly presented.

Authors:
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Publication Date:
Research Org.:
Thomas Jefferson National Accelerator Facility, Newport News, VA
Sponsoring Org.:
USDOE - Office of Energy Research (ER)
OSTI Identifier:
898819
Report Number(s):
JLAB-PHY-05-485; DOE/ER/40150-4158
TRN: US0701699
DOE Contract Number:
AC05-84ER40150
Resource Type:
Conference
Resource Relation:
Conference: 9th ICATPP Conference on Astroparticle, Particle, Space Physics, Detectors and Medical Physics Applications, Villa Erba, Como, Italy, 17-21 Oct 2005
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CATHODES; DESIGN; FOCUSING; HADRONS; KAONS; PERFORMANCE; PHYSICS; PIONS; PROTONS; RADIATORS; SPECTROMETERS; SPECTROSCOPY

Citation Formats

E. Cisbani, S. Colilli, F. Cusanno, S. Frullani, R. Frantoni, F. Garibaldi, F. Giuliani, M. Gricia, M. Lucentini, M.L. Magliozzi, L. Pierangeli, F. Santavenere, P. Veneroni, G.M. Urciuoli, M. Iodice, G. De Cataldo, R. De Leo, L. Lagamba, S. Marrone, E. Nappi, V. Paticchio, R. Feuerbach, D. Higinbotham, J. Lerose, B. Kross, R. Michaels, Y. Qiang, B. Reitz, J. Segal, B. Wojtsekhowski, C. Zorn, A. Acha, P. Markowitz, C.C. Chang, and H. Breuer. RICH detector at Jefferson Lab, design, performance and physics results. United States: N. p., 2006. Web.
E. Cisbani, S. Colilli, F. Cusanno, S. Frullani, R. Frantoni, F. Garibaldi, F. Giuliani, M. Gricia, M. Lucentini, M.L. Magliozzi, L. Pierangeli, F. Santavenere, P. Veneroni, G.M. Urciuoli, M. Iodice, G. De Cataldo, R. De Leo, L. Lagamba, S. Marrone, E. Nappi, V. Paticchio, R. Feuerbach, D. Higinbotham, J. Lerose, B. Kross, R. Michaels, Y. Qiang, B. Reitz, J. Segal, B. Wojtsekhowski, C. Zorn, A. Acha, P. Markowitz, C.C. Chang, & H. Breuer. RICH detector at Jefferson Lab, design, performance and physics results. United States.
E. Cisbani, S. Colilli, F. Cusanno, S. Frullani, R. Frantoni, F. Garibaldi, F. Giuliani, M. Gricia, M. Lucentini, M.L. Magliozzi, L. Pierangeli, F. Santavenere, P. Veneroni, G.M. Urciuoli, M. Iodice, G. De Cataldo, R. De Leo, L. Lagamba, S. Marrone, E. Nappi, V. Paticchio, R. Feuerbach, D. Higinbotham, J. Lerose, B. Kross, R. Michaels, Y. Qiang, B. Reitz, J. Segal, B. Wojtsekhowski, C. Zorn, A. Acha, P. Markowitz, C.C. Chang, and H. Breuer. Sat . "RICH detector at Jefferson Lab, design, performance and physics results". United States. doi:. https://www.osti.gov/servlets/purl/898819.
@article{osti_898819,
title = {RICH detector at Jefferson Lab, design, performance and physics results},
author = {E. Cisbani and S. Colilli and F. Cusanno and S. Frullani and R. Frantoni and F. Garibaldi and F. Giuliani and M. Gricia and M. Lucentini and M.L. Magliozzi and L. Pierangeli and F. Santavenere and P. Veneroni and G.M. Urciuoli and M. Iodice and G. De Cataldo and R. De Leo and L. Lagamba and S. Marrone and E. Nappi and V. Paticchio and R. Feuerbach and D. Higinbotham and J. Lerose and B. Kross and R. Michaels and Y. Qiang and B. Reitz and J. Segal and B. Wojtsekhowski and C. Zorn and A. Acha and P. Markowitz and C.C. Chang and H. Breuer},
abstractNote = {Since 2004 the hadron spectrometer of Hall A at Jefferson Lab is equipped with a proximity focusing RICH. This detector is capable of identify kaon from pion and proton with an angular separation starting from 6 sigma at 2 GeV/c. The RICH design is conceptually similar to the ALICE HMPID RICH; it uses a C6F14 liquid radiator and a 300 nm layer of CsI deposited on the cathode pad plane of an asymmetric MWPC. The RICH has operated for the Hypernuclear Spectroscopy Experiment E94-107, which took data in the last two years. Design details and performance along with first physics results from the hypernuclear experiment are shortly presented.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sat Apr 01 00:00:00 EST 2006},
month = {Sat Apr 01 00:00:00 EST 2006}
}

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  • Important information on the LN interaction can be obtained from High Resolution Hypernuclear Spectroscopy experiments with electromagnetic probes. A challenging experiment on electroproduction of hypernuclei is scheduled for 2003 in Hall A at Jefferson Lab. One of the challenges is the high performance particle identification system needed. The signal is expected to be rare compared to the very high pion and proton backgrounds due to the small electron and kaon detection angles. The ''standard'' Hall A PID apparatus (TOF and two aerogel threshold Cherenkov detectors) does not provide sufficient suppression of the background. Simulations and calculations have shown that amore » RICH detector would solve the problem. A proximity focusing fluorocarbon/CsI detector similar to the ALICE RICH detector has been designed, built, tested and commissioned. The results show that the detector performs as expected.« less
  • The high-resolution hypernuclear spectroscopy experiment at Jefferson Lab, Hall A (E94-107), needs unambiguous kaon identification. Due to the huge pion and proton background, the standard Hall A hadron particle identification, based on a time of flight and two aerogel threshold Cherenkov detectors, is not sufficient. For this task a proximity focusing C6F14/CsI RICH has been built. Recently, after some improvements to the mechanical structure of its wire chamber and to its electronics rate capability, the RICH has been tested with cosmic rays. This paper represents a status report of the RICH detector.
  • The CLAS12 spectrometer at JLab will offer unique possibilities to study the 3D nucleon structure in terms of TMDs and GPDs in the poorly explored valence region, and to perform high precision hadron spectroscopy. A large area ring-imaging Cherenkov detector has been designed to achieve the required hadron identification capability in the momentum range 3-8 GeV/c. The detector, based on a novel hybrid imaging design, foresees an aerogel radiator and an array of multi-anode photomultipliers. The detector concept and preliminary results of test-beams on a prototype are presented.
  • The spin physics program in Jefferson Lab's Hall B and Hall C concentrates on precision studies of the nucleon spin structure functions that can be extracted with inclusive and exclusive polarized scattering experiments in and above the resonance region at low to moderate Q{sup 2}. Results on proton and deuteron spin asymmetries, Lambda{sub 1} (W,Q{sup 2}) and Lambda{sub 2} (W,Q{sup 2}) from the Resonances' Spin Structure--RSS experiment in Hall C and the spin structure function g{sub 1} (x,Q{sup 2}) and its first moment Gamma{sub 1}(Q{sup 2}) from the CLAS EG1 Program in Hall B are presented.
  • I review highlights of the Jefferson Lab nucleon structure program. I shall emphasize recent results from experiments exploring the spin structure of the nucleon and from dedicated experiments aimed at accessing the generalized parton distributions (GPDs).