Matrix hodoscopes for the Oka (Protvino) and NA62 (SPS, CERN) experimental setups
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EMENTARY PARTICLES AND FIELDS Experiment
Matrix Hodoscopes for the Oka (Protvino) and NA62 (SPS, CERN) Experimental Setups E. N. Gushchin1), V. F. Kurshetsov2), V. A. Lebedev1) , V. I. Romanovskiy2), V. K. Semenov2) , S. N. Filippov2), and A. A. Khudyakov1)* Received February 10, 2010; in final form, December 1, 2010
Abstract—The matrix hodoscope of the OKA experimental setup and a prototype of the hodoscope for the NA62 experiment are described. The design of both hodoscopes is presented. The requirements for the hodoscope prototype are listed, and the efficiency and the time resolution obtained on the basis of experimental data are quoted. DOI: 10.1134/S1063778811050103
1. INTRODUCTION 1.1. OKA Experimental Setup
75-GeV/с beam of high intensity (3.3 × 1012 protons per spill).
The OKA experimental setup [1, 2] is intended for precisely measuring parameters of rare kaon decays whose branching ratio falls within the range 10−3 −10−8 . A separated K + meson beam of momentum 12.7 GeV/c and and intensity (4−6) × 106 K + mesons per spill is used at this setup. The layout of the experimental setup is shown in Fig. 1. It includes scintillation counters (S); beam-spectrometer proportional chambers (BPC); ˇ 1,2 ), which are intended gas Cherenkov counters (C for identifying primary kaons; an 11-m-long decay volume equipped with a veto system; a wide-aperture magnetic spectrometer equipped with proportional chambers (PC), drift tubes (DT), and straw detectors (ST); a two-section multichannel gamma spectrometer (GAMS-EGS and GAMS-2000); a complete-absorption hadronic calorimeter (GDA100); a matrix hodoscope (MH); and muon counters (MC).
The layout of the setup is presented in Fig. 2. The setup includes a GIGATRACKER beam spectrometer, an evacuated decay volume of length 80 m, a CEDAR differential Cherenkov counter for identifying primary kaons and a ring-imaging Cherenkov counter (RICH) for identifying pions, a pulsed spectrometer that employs straw detectors, a liquid-krypton calorimeter (LKr), and muon detectors (MuV).
1.2. NA62 Experimental Setup
First, it is intended for resolving the XY ambiguity since the pad hodoscope determines unambiguously the particle coordinate and since the setup does not involve inclined chambers.
The NA62 experimental setup [3] is intended primarily for measuring the branching ratio for the ultrarare decay K + → π + ν ν¯. This will make it possible to test Standard Model predictions to a high precision. The setup in question employs an unseparated 1)
Institute for Nuclear Research, Russian Academy of Sciences, pr. Shestidesyatiletiya Oktyabrya 7a, Moscow, 117312 Russia. 2) Institute for High Energy Physics, Protvino, Moscow oblast, 142284 Russia. * E-mail: [email protected]
2. MATRIX HODOSCOPE OF THE OKA EXPERIMENTAL SETUP The matrix hodoscope is arranged downstream of the electromagnetic calorimeter in the immediate vicinity of it. In the schematic picture of the setup (see Fig. 1), these two units are denoted by MH and GAMS-2000, respectively. The hodoscope serves for solving the
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