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CLAS12 – RICH · 3/24/2017 · Contact: P.(Rossi,(ProjectManager(([email protected])(757)2697740...
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CLAS12 – RICH PARAMETER DESIGN VALUE Momentum range 38 GeV/c π/K rejec5on factor Not less than 500 Κ/p rejec5on factor Not less than 100 Angular coverage 5 o to 25 o Cherenkov light radiator Aerogel Aerogel refrac5on index 1.05 Photodetector 64 channels photomul5pliers (MAPMTs) Number of PMTs 391 Total number of readout channels 25024 Electronics MAROC3 and FPGA on detector boards fully integrated into the CLAS12 DAQ Data transfer to CLAS12 DAQ Fiber op5cs cables Spherical mirror Carbonfiberreinforced polymer (CFRP) Radius of curvature =2700 mm Area= 3.38 m 2 Flat mirror Sandwich with glass skin (0.7+0.7 mm) and Al honeycomb core 8.6 mm thick RICH - TECHNICAL PARAMETERS • The Ring Imaging Cherenkov detector (RICH) is designed to improve CLAS12 par5cle iden5fica5on in the momentum range 38 GeV/c and will replace one sector of the exis5ng LTCC detector. • The RICH design incorporates aerogel radiators, visible light photon detectors, and a focusing mirror system, which will be used to reduce the detec5on area instrumented by photon detectors to ~1 m 2 . Mul5anode photomul5plier tubes (MAPMTs) provide the required spa5al resolu5on and match the aerogel Cherenkov light spectrum (visible and nearultraviolet region). • For forward scacered par5cles (θ< 13 o ) with momenta 3 8 GeV/c, a proximity imaging method with thin (2 cm) aerogel and direct Cherenkov light detec5on will be used. • For larger incident par5cle angles of 13 o <θ<25 o and momenta of 3 6 GeV/c, the Cherenkov light will be produced by a thicker aerogel (6 cm), focused by a spherical mirror, undergo two further passes through the thin radiator material and a reflec5on from planar mirrors before detec5on.
Transcript of CLAS12 – RICH · 3/24/2017 · Contact: P.(Rossi,(ProjectManager(([email protected])(757)2697740...
CLAS12 – RICH
PARAMETER DESIGN VALUE Momentum range 3-‐8 GeV/c π/K rejec5on factor Not less than 500 Κ/p rejec5on factor Not less than 100
Angular coverage 5o to 25o
Cherenkov light radiator Aerogel Aerogel refrac5on index 1.05
Photodetector 64 channels photomul5pliers (MA-‐PMTs) Number of PMTs 391
Total number of readout channels 25024 Electronics MAROC3 and FPGA on detector boards
fully integrated into the CLAS12 DAQ Data transfer to CLAS12 DAQ Fiber op5cs cables
Spherical mirror Carbon-‐fiber-‐reinforced polymer (CFRP) Radius of curvature =2700 mm Area= 3.38 m2
Flat mirror Sandwich with glass skin (0.7+0.7 mm) and Al honeycomb core 8.6 mm thick
RICH - TECHNICAL PARAMETERS
• The Ring Imaging Cherenkov detector (RICH) is designed to improve CLAS12 par5cle iden5fica5on in the momentum range 3-‐8 GeV/c and will replace one sector of the exis5ng LTCC detector.
• The RICH design incorporates aerogel radiators, visible light photon detectors, and a focusing mirror system, which will be used to reduce the detec5on area instrumented by photon detectors to ~1 m2 . Mul5-‐anode photomul5plier tubes (MA-‐PMTs) provide the required spa5al resolu5on and match the aerogel Cherenkov light spectrum (visible and near-‐ultraviolet region).
• For forward scacered par5cles (θ< 13o) with momenta 3 -‐ 8 GeV/c, a proximity imaging method with thin (2 cm) aerogel and direct Cherenkov light detec5on will be used.
• For larger incident par5cle angles of 13o<θ<25o and momenta of 3 -‐ 6 GeV/c, the Cherenkov light will be produced by a thicker aerogel (6 cm), focused by a spherical mirror, undergo two further passes through the thin radiator material and a reflec5on from planar mirrors before detec5on.
Contact: P. Rossi, Project Manager ([email protected]) (757)-‐269-‐7740 M. Contalbrigo ([email protected]), V. Kubarovsky ([email protected]), M. Mirazita ([email protected]) V. D. Burkert, Hall B Group Leader ([email protected]) (757)-‐269-‐7540
• Project Status:
1. Electronics: Produc5on done. Acceptance test done. Characteriza5on ongoing. Typical pedestal width at the level of 1% SPE signal.
2. Aerogel: got >75 % of the 3 cm minimum quan5ty required. Produc5on of the 2cm layer started.
3. Planar Mirrors: 3/5 lateral mirrors accepted. 2 front mirror in produc5on. 4. Spherical mirrors: all 10 mirrors accepted. Back to vendor to build support and
alignment structure. 5. Mechanics: RICH mechanic structure assembled at JLab. Electronic Panel
assembling structure ready. Exit window, patch panels, installa5on tools in prepara5on.
6. MA-‐PMTs: 80 H8500 and 350 H12700 PMTs delivered by Hamamatsu and tested at JLab. All MA-‐PMTs match the specifica5ons.
• Significant Dates:
– 2012-‐2013: Test-‐beam with electrons (Frasca5-‐INFN) and hadrons (CERN).
– June 2013: Hall-‐B review. – Sep. 2013: Physics Division review with DOE observers. – Sep. 2013: RICH project started. – Sep. 2013: Hamamatsu contract awarded. – Oct. 2015: Mid-‐term project review. – Jun. 2016: Readiness review. – Mar. 2017: RICH mechanic structure assembled.
• Construc4on Strategy and Project Leadership:
– The RICH Collabora5on includes INFN (Italy), JLab, Argonne Na5onal Lab, Duquesne University (DUQ), University of Connec5cut (UCONN), George Washington University (GWU), Kyungpook Na5onal University (Republic of Korea), Universidad Tecnica Federico Santa Maria (Chile), University of Glasgow (UK).
– The detector components (aerogel, PMTs, mirrors and electronics) will be tested at the collabora5on ins5tu5ons.
– The whole assembly will take place at JLab.
MA-‐PMTs
Aerogel
RICH electronic panel ready for assembling
RICH planar mirror fulfilling specs
Last Updated: March 24, 2017
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