hall a pressurized gas cerenkov design goals: separate and k for p>2.3gev/c. continue to...
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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 C4F
10 or CO
2 as the
radiator. Expect average of 10 p.e. for a
2.3GeV/c pion with C4F
10
rejection factor of 400 (3 p.e. cutoff)
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
Design performance
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
Design performance
Model 4: No top and Bottom faces, includes a “C” Channel on one face
Max Stress : 263 ksiMax Deflection : 1.59 inches
Boundary Conditions: Pressure on all faces (14.7 psi), Fixed at the bottom and top surface,
Model 4: Plot shows surfaces where stresses are in the range of 0-23 ksi
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)
Bogdan’s concept
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%).
0.36%
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)
Rich /K separation for p > 2.5 GeV/c
Radiator C6F14 n=1.29 Ch ~ 5mr
Radiator C5F12 n=1.24 Ch ~ 5mr
4 separation at ~ 2.5 GeV/c 4 separation at ~ 3.0 GeV/c
Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004
Rich /K separation with C5F12 (n=1.24) radiator (14 cm proximity gap)
>20 separation at ~ 2 GeV/c ~ 4 separation at 3.0 GeV/c
Mauro Iodice – RICH2004 - Playa del Carmen, Mexico - Nov.30 Dec. 5, 2004
MonteCarlo Simulations