Precision timing measurements for high energy photons

Journal Article · Fri Nov 21 00:00:00 EST 2014 · Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment

DOI:https://doi.org/10.1016/j.nima.2014.11.041· OSTI ID:1223870

Anderson, Dustin ^[1]; Apreysan, Artur ^[1]; Bornheim, Adi ^[1]; Duarte, Javier ^[1]; Newman, Harvey ^[1]; Pena, Cristian ^[1]; Ronzhin, Anatoly ^[2]; Spiropulu, Maria ^[1]; Trevor, Jason ^[1]; Xie, Si ^[1]; Zhu, Ren-Yuan ^[1]

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1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
2. Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)

Particle colliders operating at high luminosities present challenging environments for high energy physics event reconstruction and analysis. We discuss how timing information, with a precision on the order of 10 ps, can aid in the reconstruction of physics events under such conditions. We present calorimeter based timing measurements from test beam experiments in which we explore the ultimate timing precision achievable for high energy photons or electrons of 10 GeV and above. Using a prototype calorimeter consisting of a 1.7×1.7×1.7 cm³ lutetium–yttrium oxyortho-silicate (LYSO) crystal cube, read out by micro-channel plate photomultipliers, we demonstrate a time resolution of 33.5±2.1 ps for an incoming beam energy of 32 GeV. In a second measurement, using a 2.5×2.5×20 cm³ LYSO crystal placed perpendicularly to the electron beam, we achieve a time resolution of 59±11 ps using a beam energy of 4 GeV. We also present timing measurements made using a shashlik-style calorimeter cell made of LYSO and tungsten plates, and demonstrate that the apparatus achieves a time resolution of 54±5 ps for an incoming beam energy of 32 GeV.

• Research Organization: Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
• Sponsoring Organization: USDOE Office of Science (SC), High Energy Physics (HEP)
• DOE Contract Number: AC02-07CH11359
• OSTI ID: 1223870
• Report Number(s): FERMILAB-PUB-15-245-PPD; PII: S0168900214013291
• Journal Information: Nuclear Instruments and Methods in Physics Research. Section A, Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 787, Issue C; ISSN 0168-9002
• Publisher: Elsevier
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
precision timing
calorimetry
high energy physics
picosecond