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Hall A Pressurized Gas Cerenkov

Design Goals: Separate  and K for p>2.3GeV/c. Continue to differentiate e/  Features: Operates at pressures up to 10 psig, using C 4 F 10 or CO 2 as the radiator. Expect average of 10 p.e. for a 2.3GeV/c pion with C 4 F 10  rejection factor of 400 (3 p.e. cutoff).

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Hall A Pressurized Gas Cerenkov

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  1. Design Goals: Separate  and K for p>2.3GeV/c. Continue to differentiate e/ Features: Operates at pressures up to 10 psig, using C4F10 or CO2 as the radiator. Expect average of 10 p.e. for a 2.3GeV/c pion with C4F10  rejection factor of 400 (3 p.e. cutoff) Hall A Pressurized Gas Cerenkov Experiments: Pentaquark (E05-009), Transversity SSA (E03-004), Flavor Asymmetry in SIDIS (PR04-114 cond. app.) Design and fabrication in collaboration with:Argonne National Laboratory, Rutgers University, and Jefferson Lab

  2. Design performance

  3. Design (cont) • Control cost and effort by re-using optics from present cerenkov. • Can the present box be re-used? What modifications are necessary? Finite element analysis by Ravi Anumagalla

  4. Design performance

  5. Model 4: No top and Bottom faces, includes a “C” Channel on one face Max Stress : 263 ksi Max Deflection : 1.59 inches Boundary Conditions: Pressure on all faces (14.7 psi), Fixed at the bottom and top surface,

  6. Model 4: Plot shows surfaces where stresses are in the range of 0-23 ksi

  7. Design (cont) • Control cost and effort by re-using optics from present cerenkov. • Can the present box be re-used? What modifications are necessary? Finite element analysis by Ravi Anumagalla • Weight goes from 750lbs to ~2200lbs. • Another idea by Bogdan: titanium cylinder with interior supports (being priced now)

  8. Bogdan’s concept

  9. Common features • PMT sealed against interior for servicing while the chamber is pressurized. • Simple stationary gas system since it will be filled from the Hall B gas system. • Size is compatible with current short cerenkov. • Low-number of knock-on electrons for 0.4mm Ti window (<2%).

  10. 0.36%

  11. Conclusion • Pressurized Cerenkov design continuing. • Should provide excellent pi/K separation for momenta greater than 2.3 GeV/c • Need to finalize the design (after cost estimates are made)

  12. Rich p/K separation for p > 2.5 GeV/c Radiator C5F12 n=1.24 sCh~ 5mr Radiator C6F14 n=1.29 sCh~ 5mr 4 s separation at ~ 2.5 GeV/c 4 s separation at ~ 3.0 GeV/c Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

  13. Rich p/K separation with C5F12 (n=1.24) radiator (14 cm proximity gap) MonteCarlo Simulations >20 s separation at ~ 2 GeV/c ~ 4 s separation at 3.0 GeV/c Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004

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