The lead-glass electromagnetic calorimeters for the magnetic spectrometers in Hall C at Jefferson Lab

Journal Article · Thu Aug 01 00:00:00 EDT 2013 · Nucl.Instr.Meth.A

DOI:https://doi.org/10.1016/j.nima.2013.03.070· OSTI ID:1079212

Mkrtchyan, Hamlet ^[1]; Carlini, Roger D. ^[2]; Tadevosyan, Vardan H. ^[3]; Arrington, John Robert ^[4]; Asaturyan, Arshak Razmik ^[3]; Christy, Michael Eric ^[5]; Dutta, Dipangkar ^[6]; Ent, Rolf ^[2]; Fenker, Howard C. ^[2]; Gaskell, David J. ^[2]; Horn, Tanja ^[7]; Jones, Mark K. ^[2]; Keppel, Cynthia ^[8]; Mack, David J. ^[2]; Malace, Simona P. ^[9]; Mkrtchyan, Arthur ^[3]; Niculescu, Maria-Ioana ^[10]; Seely, Charles Jason ^[11]; Tvaskis, Vladas ^[12]; Wood, Stephen A. ^[2] ; Zhamkochyan, Simon ^[3]

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1. Yerevan Physics Institute, JLAB
2. JLAB
3. Yerevan Physics Institute
4. ANL
5. Hampton U.
6. Mississippi State U.
7. Catholic University of America, JLAB
8. JLAB, Hampton U.
9. Triangle Universities Nuclear Laboratory and Duke University
10. James Madison U.
11. MIT
12. University of Manitoba

The electromagnetic calorimeters of the various magnetic spectrometers in Hall C at Jefferson Lab are presented. For the existing HMS and SOS spectrometers design considerations, relevant construction information, and comparisons of simulated and experimental results are included. The energy resolution of the HMS and SOS calorimeters is better than $$\sigma/E \sim 6%/\sqrt E $$, and pion/electron ($$\pi/e$$) separation of about 100:1 has been achieved in energy range 1 -- 5 GeV. Good agreement has been observed between the experimental and simulated energy resolutions, but simulations systematically exceed experimentally determined $$\pi^-$$ suppression factors by close to a factor of two. For the SHMS spectrometer presently under construction details on the design and accompanying GEANT4 simulation efforts are given. The anticipated performance of the new calorimeter is predicted over the full momentum range of the SHMS. Good electron/hadron separation is anticipated by combining the energy deposited in an initial (preshower) calorimeter layer with the total energy deposited in the calorimeter.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1079212
• Report Number(s): JLAB-PHY-12-1524; DOE/OR/23177-2097; arXiv:1204.6413
• Journal Information: Nucl.Instr.Meth.A, Vol. 719
• Country of Publication: United States
• Language: English

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46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY