Review of beam energy measurements at VEPP-4M collider KEDR/VEPP-4M

被引：44

作者：

Blinov, V. E. ^{[1
]}

Bogomyagkov, A. V. ^{[1
]}

Muchnoi, N. Yu. ^{[1
]}

Nikitin, S. A. ^{[1
]}

Nikolaev, I. B. ^{[1
]}

Shamov, A. G. ^{[1
]}

Zhilich, V. N. ^{[1
]}

机构：

[1] Budker Inst Nucl Phys, Novosibirsk 630090, Russia

来源：

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT | 2009年 / 598卷 / 01期

关键词：

Beam energy measurement; Energy calibration; Depolarization technique; Compton scattering; HIGH-PRECISION MEASUREMENT; UPSILON-MESON MASS; KEDR DETECTOR; LASER PHOTONS; TAU-LEPTON; CALIBRATION; J/PSI;

D O I：

10.1016/j.nima.2008.08.078

中图分类号：

TH7 [仪器、仪表];

学科分类号：

0804 ; 080401 ; 081102 ;

摘要：

An accurate knowledge of the colliding beam energies is essential for the current experiments with the KEDR detector at the VEPP-4M collider. Now the experimental activity is focused on the measurements of tau lepton mass and parameters of narrow resonances of the psi-family in the c.m.energy range of 3.0-4.0 GeV. Two complementary approaches are used for the beam energy measurements. The resonant spin depolarization technique (RD) provides an accuracy about 1-3 keV for the instantaneous beam energy value, but requires a special regime of the collider. Between calibrations the interpolation procedure is used providing the accuracy of 6-10 keV for the J/psi, psi(2s) and 15-30 keV for the tau lepton mass determination experiments. Another approach allows to calculate beam energy via the maximum energy of backscattering laser photons. The Compton BackScattering (CBS) monitor allows continuous on-line monitoring of the beam energy with accuracy about 150keV, which is critical during the tau lepton mass measurement. The statistical error for a 1 h period is about 100 keV, the present systematic error is 50-70 keV. (C) 2008 Published by Elsevier B.V.

引用

页码：23 / 30

页数：8

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