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1. The KEDR detector

Author

E. B. Levichev, I. V. Bedny, A. A. Osipov, A. M. Sukharev, E. M. Baldin, Yu. I. Skovpen, V. V. Smalyuk, A. R. Buzykaev, V. V. Anashin, V. M. Aulchenko, E. A. Kravchenko, Yu. A. Tikhonov, I. B. Nikolaev, S. G. Pivovarov, N. Yu. Muchnoi, S. V. Karpov, A. E. Blinov, M. Yu. Barnyakov, V. N. Kudryavtsev, A. E. Bondar, V. M. Malyshev, V. V. Gulevich, A. A. Ruban, S. V. Peleganchuk, T. A. Kharlamova, A. I. Shusharo, I. O. Orlov, O. L. Beloborodova, A. G. Shamov, A. K. Barladyan, V. N. Zhilich, V. S. Bobrovnikov, V. F. Kulikov, A. I. Vorobiov, A. N. Skrinsky, A. L. Maslennikov, A. A. Talyshev, A. S. Medvedko, A. P. Onuchin, E. A. Kuper, G. A. Savinov, G. E. Pospelov, A. N. Yushkov, B.A. Shwartz, S.A. Nikitin, V. A. Tayursky, L. V. Dneprovsky, I.Yu. Basok, Y. Usov, A. V. Bobrov, Andrey Sokolov, R. G. Snopkov, V. A. Rodyakin, S. E. Baru, S.A. Kononov, L. I. Shekhtman, G. V. Karpov, A. S. Kuzmin, S. B. Oreshkin, Valery I. Telnov, V. G. Prisekin, V. V. Zhulanov, V. E. Blinov, K. Yu. Kotov, D. A. Maksimov, A.Yu. Barnyakov, K. Yu Todyshev, and Anton Poluektov

Subjects
Physics, Nuclear and High Energy Physics, Photon, Physics::Instrumentation and Detectors, Detector, Large series, Magnetic detector, Compton backscattering, Laser, law.invention, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Beam energy
Abstract

The KEDR detector is a universal magnetic detector designed for studying the c- and b-quarks and two-photon physics, and is employed at the VEPP-4M e + e − collider. A specific feature of the experiment is the measurement of absolute beam energy using two methods: the resonant depolarization and the faster but less precise Compton backscattering of laser photons. This allowed a large series of measurements to be performed, in which the accuracy of determination of such fundamental parameters of particles as mass and total and leptonic widths was improved.

Published
2013
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2. Status of the KEDR drift chamber

Author

Alexey Talyshev, K.Y Todyshev, G.D. Minakov, A. E. Blinov, S.E. Baru, G.A. Savinov, I.N. Popkov, G. M. Kolachev, V.R. Groshev, A.G. Shamov, A. P. Onuchin, A. I. Shusharo, V. E. Blinov, and A. N. Yushkov

Subjects
Physics, Nuclear and High Energy Physics, business.industry, Drop (liquid), Particle identification, Particle detector, Optics, Particle separation, Townsend discharge, Measuring instrument, business, Instrumentation, Image resolution, Pulse height
Abstract

The 1 m long and 1 m outer diameter KEDR drift chamber consists of 42 layers. The chamber is based on a jet type cell. In addition to drift time measurements, pulse height measurements will provide particle separation by d E dx . The measurements of the spatial resolution and the effects of the end plates on resolution and aging tests were performed using prototypes filled with DME gas. The resolution averaged over the drift distance has a value of 40 μm. The relative gain drop is equal to 45 %/(C/cm).

Published
2002
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3. The KEDR drift chamber

Author

S.E. Baru, A.V. Rylin, V.R. Groshev, G.A. Savinov, G. M. Kolachev, V. E. Blinov, A. I. Shusharo, G.D. Minakov, A.G. Shamov, V.N. Kozlov, and A. P. Onuchin

Subjects
Physics, Nuclear and High Energy Physics, Wire chamber, Physics::Instrumentation and Detectors, business.industry, Drop (liquid), Flux, Sense (electronics), Particle detector, Charged particle, Optics, Measuring instrument, business, Instrumentation, Image resolution
Abstract

The design features of the KEDR drift chamber are described. The 1 m long and 1 m outer diameter cylindrical chamber consists of seven radial super layers. The multiwire drift cell contains six sense wires with a distance of 4.5 mm. The maximum drift distance is 30 mm. Measurements of spatial resolution and aging tests were performed using DME gas with a prototype. The resolution averaged over drift distance has a value of 40 μm. The relative gain drop is equal to 45%/(C/cm). This would correspond to 2% pulse height decrease per year at a gas gain of 105 and flux of the charged particles of 1 kHz/cm2.

Published
1992
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4. The KEDR drift chamber based on dimethyl ether

Author

A.G. Shamov, A. N. Yushkov, A. I. Shusharo, G. M. Kolachev, A.V. Rylin, Alexey Talyshev, G.A. Savinov, V. E. Blinov, S. S. Petrosyan, S.E. Baru, A. P. Onuchin, V.R. Groshev, A. E. Blinov, G.D. Minakov, and V.N. Kozlov

Subjects
Physics, Nuclear and High Energy Physics, Outer diameter, Physics::Instrumentation and Detectors, business.industry, Drop (liquid), Analytical chemistry, Laser, law.invention, chemistry.chemical_compound, Optics, chemistry, law, Dimethyl ether, business, Instrumentation, Image resolution
Abstract

The 1 m long and 1 m outer diameter chamber consists of 42 layers. The chamber is based on a cell of the jet type with drift distance of 30 mm. The measurements of the spatial resolution and the aging tests were performed with DME gas on prototypes. The resolution averaged over the drift distance has a value of 45 μ m. The relative gain drop is equal to 45%/(C/cm). The design and construction of the chamber, the gas system, the laser calibration system and first results of the cosmic-ray test are discussed.

Published
1998
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5. New precision measurement of the J/ψ- and ψʹ-meson masses

Author

Evgenii Baldin, D.V. Bondarev, S.E. Baru, Yu. A. Pakhotin, Evgeny Levichev, S. A. Balashov, I. B. Nikolaev, V.R. Groshev, Alexey Maslennikov, A. V. Zatsepin, V.N. Zhilich, Oleg Meshkov, V. V. Petrov, Valery I. Telnov, Sergey Peleganchuk, A. P. Onuchin, A. I. Naumenkov, A. R. Buzykaev, A. I. Shusharo, A. Bondar, S. S. Petrosyan, V.M. Aulchenko, N. Yu. Muchnoi, S.A. Kononov, K. Yu Todyshev, S. E. Mishnev, V.A. Tayursky, Sergey Karnaev, I. Bedny, K. A. Kotov, Olga Beloborodova, E. V. Kremyanskaya, A.G. Shamov, V.A. Sidorov, V. E. Blinov, A.A. Polunin, M.Yu. Barnyakov, A.I. Vorobiov, S.I. Eidelman, Andrey Soukharev, G.M. Tumaikin, A. V. Bogomyagkov, A.N. Skrinsky, Yu. V. Usov, V. A. Kiselev, E. A. Kravchenko, A. N. Yushkov, G.A. Savinov, A. E. Blinov, V. M. Malyshev, S.B. Oreshkin, E. A. Simonov, S.A. Nikitin, Yu. A. Tikhonov, Dmitry Shatilov, G. E. Pospelov, Alexey Talyshev, Yu I. Skovpen, Anton Poluektov, I. Ya. Protopopov, and B.A. Shwartz

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Accuracy and precision, Observational error, Meson, Electron–positron annihilation, Detector, Mass measurement, Absolute calibration, High Energy Physics - Experiment, law.invention, Nuclear physics, Error analysis, law, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Beam energy
Abstract

A new high precision measurement of the $J/\psi$- and $\psi'$-meson masses has been performed at the VEPP-4M collider using the KEDR detector. The resonant depolarization method has been employed for the absolute calibration of the beam energy. The following mass values have been obtained: $M_{J/\psi} = 3096.917 \pm 0.010 \pm 0.007$ MeV, $M_{\psi'} = 3686.111 \pm 0.025 \pm 0.009$ MeV. The relative measurement accuracy has reached $4. 10^{-6}$ for $J/\psi$ and $7. 10^{-6}$ for $\psi'$, approximately 3 times better than in the previous precise experiments., Comment: 12 pages, 4 tables, 10 figures

Published
2004
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6. Status of the KEDR detector

Author

M.Yu. Lelchuk, M.Yu. Barnyakov, A.G. Chilingarov, A. N. Yushkov, F. Palombo, L.V Romanov, L.M. Barkov, R Ovechkin, N.I. Root, V. A. Kiselev, P.B. Gaidarev, S.V Pivovarov, A.A. Ruban, G.A. Savinov, S.I. Eidelman, V.A. Sidorov, D.A Epifanov, G.D. Minakov, S.B. Oreshkin, I Bedny, V. F. Kulikov, V. E. Blinov, V.M Malyshev, D.M Beilin, P.F. Manfredi, Evgeny Levichev, Valery I. Telnov, A.M Soukharev, L.A. Leontiev, M.A Shubin, D. N. Shatilov, A.G. Shamov, S.A. Nikitin, P. L. Frabetti, A. Bondar, S. S. Petrosyan, V.N. Kozlov, A.S. Kuzmin, Yu. V. Usov, P. Cantoni, A. R. Buzykaev, S.A. Kononov, Valerio Re, Yu I. Skovpen, Francesco Lanni, B.O Baibusinov, D.V Bondarev, L. Dneprovsky, A. I. Shusharo, Sergey Peleganchuk, A.A Talyshev, B.A. Shwartz, R. Snopkov, V.P Nagaslaev, V.P. Smakhtin, G. M. Kolachev, I. Ya. Protopopov, E.M Baldin, S.V. Karpov, Anton Poluektov, A. P. Onuchin, V. N. Zhilich, A.K. Barladyan, V.M. Aulchenko, V.V. Anashin, L.M. Kurdadze, E. A. Kravchenko, Alexey Maslennikov, V.R. Groshev, A. Sokolov, A. E. Blinov, Yu. A. Tikhonov, A.B. Nomerotsky, S.E. Baru, G. E. Pospelov, S.G. Klimenko, A.I Vorobyev, A. I. Naumenkov, K. Yu Todyshev, V.A. Tayursky, A.V Zatcepin, S.A Kuznecov, and V Balashov

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Meson, Physics::Instrumentation and Detectors, Detector, Linear particle accelerator, Particle detector, law.invention, Nuclear physics, law, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, Instrumentation, Energy (signal processing), Cherenkov radiation
Abstract

KEDR is a general-purpose detector for experiments at the VEPP-4M e + e − -collider in the energy range 2 E =2.0– 12 GeV . All detector subsystems (except the aerogel Cherenkov counters) have been installed into the detector at VEPP-4M. Some preliminary data have been taken in the energy region of the J/Ψ meson. The tuning of the detector and the VEPP-4M collider is in progress. Preliminary results on the detector performance are presented. The future experimental program for the KEDR detector is discussed.

Published
2002

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