Applications of Beam Diagnostic System at the VEPP-4 (original) (raw)

New fast beam profile monitor for electron-positron colliders

Review of Scientific Instruments, 2007

A new fast beam profile monitor has been developed at the Budker Institute of Nuclear Physics. This monitor is based on the Hamamatsu multianode photomultiplier with 16 anode strips and provides turn-by-turn measurement of the transverse beam profile. The device is equipped with an internal memory, which has enough capacity to store 131 072 samples of the beam profile. The dynamic range of the beam profile monitor allows us to study turn-by-turn beam dynamics within the bunch charge range from 1 pC up to 10 nC. Using this instrument, we have investigated at the VEPP-4M electron-positron collider a number of beam dynamics effects which cannot be observed by other beam diagnostics tools.

Experimental study of nonlinear beam dynamics at VEPP-4M

Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 1998

Nonlinear dynamics of transverse beam motion has been studied experimentally at the VEPP-4M electron-positron collider. Two aspects of nonlinear beam behaviour described in this paper are the amplitude-dependent tune shift and the phase space trajectories near nonlinear resonances. The measurement results are presented and compared with the theoretical prediction.

Proceedings of the CERN Accelerator School: Course on Beam Diagnostics

This introductory course gives an overview of why diagnostics equipment is crucial for running accelerator facilities. Even if significant progress has been made over the last two decades in terms of designing and modelling an accel- erator, model and reality differ all the time. The commissioning stages of a synchrotron light source and the stability of the beam positions are taken as examples. The main orbit disturbances are driven by alignment errors, drifts with temperature, vibrations, timing system jitters. Reaching a high level of stability and beam availability in facilities is very challenging. This is attained by driving forward the equipment performance. This starts off with the design of the building and the girders supporting the equipment, the optimization of magnets, the stability and precisionof the power supply, the diagnostics elec- tronics, and the careful design of the beamlines. In addition, passive and active corrections have to be devised to maintain the highl...

Experiments on the physics of charged particle beams at the VEPP-4M electron-positron collider

Journal of Experimental and Theoretical Physics, 2009

The VEPP 4M accelerator facility with a universal KEDR detector is designed to conduct exper iments with colliding electron-positron beams. High energy physics, nuclear physics, and studies using syn chrotron radiation are the main directions of research with this facility. In addition, experiments on poorly explored issues in the physics of beams in the electron-positron storage ring and methodological studies to prepare an experiment aimed at testing corollaries of the CPT theorem for an electron and a positron are reg ularly conducted at the VEPP 4 facility. A number of works performed in recent years are described: studies to increase the accuracy of comparing the electron and positron spin precession frequencies by the resonant depolarization method; measurements of the count rate of Touschek electrons as a function of the beam energy in a wide range; comparison of the methods for measuring the beam energy spread; a study of the elec tron beam dynamics when a nonlinear betatron resonance is crossed.

Beam measurements with visible synchrotron light at VEPP-2000 collider

2010

This paper describes beam diagnostics at VEPP-2000 collider, based on visible synchrotron light analysis. These beam instruments include: SR beamline and optics; acquisition tools and high resolution CCD cameras distributed around the storage ring to measure the transverse beam profile and its position in vacuum chamber; photomultiplier tubes (PMT) which enables beam current measurements; video system. Some applications of these measurement systems and their measurement results are presented.

Accelerator Physics Activity at the VEPP-4M Collider

The VEPP-4M electron-positron collider is now operating with the KEDR detector for high-energy physics experiments in the 1.5−2.0 GeV beam energy range. Parallel with these experiments, the VEPP-4M scientific team carries out a number of accelerator physics investigations. A new registration system for the Touschek polarimeter has been put into operation. A new NMRbased system for suppression of the guide field ripples has been developed. The counting rate of the Touschek particles has been measured as a function of the beam energy in the range from 1.85 to 4 GeV. The measurement results can be claimed at the future super B and C-Tau factories. For simultaneous measurement of the transverse beam position and inclination angle an X-ray multipinhole camera has been designed, manufactured and installed at the VEPP-4M. To suppress the longitudinal instability caused by high-order modes of the RF cavities, a feedback system has been developed.

Design and testing of a fast beam position monitor

Proceedings of the 2003 Bipolar/BiCMOS Circuits and Technology Meeting (IEEE Cat. No.03CH37440), 2003

The University of Maryland Electron Ring (UMER) group is currently exploring the physics of space-charge dominated beams. Seventeen Beam Position Monitors (BPMs) will be used to determine the beam centroid for steering correction purposes to within 0.5 mm. Since the pulse length is relatively long (100 ns), the BPMs can also be used for temporal beam profiling. These features are extremely useful for perturbation and longitudinal dynamics studies. For these uses the BPM needs a temporal resolution better than 2 ns. We report on the final design and testing as well as other unique features of this device.

Operation of the Beam Position Monitor for the Spiral 2 Linac on the Test Bench of the RFQ

2017

SPIRAL2 project is based on a multi-beam superconducting LINAC designed to accelerate 5 mA deuteron beams up to 40 MeV, proton beams up to 33 MeV and 1 mA light and heavy ions (Q/A = 1/3) up to 14.5 MeV/A. The accurate tuning of the LINAC is essential for the operation of SPIRAL2 and requires measurement of the beam transverse position, the phase of the beam with respect to the radiofrequency voltage, the ellipticity of the beam and the beam energy with the help of Beam Position Monitor (BPM) system. The commissioning of the RFQ gave us the opportunity to install a BPM sensor, associated with its electronics, mounted on a test bench. The test bench is a D-plate fully equipped with a complete set of beam diagnostic equipment in order to characterize as completely as possible the beam delivered by the RFQ and to gain experience with the behavior of these diagnostics under beam operation. This paper addresses the first measurements carried with the BPM on the Dplate: intensity, phase, ...

Field display system for the forecast of beam momentum and betatron frequencies in LHC

1995

requirement. acceleration. The described system forms an important tool for meeting this synchronization of the magnetic fields is of vital importance during particle simultaneous measurements in dipole and quadrupoles. Precise expected betatron frequencies can be calculated from the results of the both at steady field conditions and during particle acceleration. The information about the focussing parameters. Measurements are performed momentum at central orbit. Reference quadrupoles provide the hysteresis and remanent field effects, and thus the value of particle characteristics such as the field integral in the bending magnets including reference dipole provides information about magnet excitation reference magnets connected in series with the main ring magnet strings. A (LHC). The method is based on magnetic field measurements in a set of momentum and betatron frequencies in the CERN Large Hadron Collider This note describes a measurement system for the forecast of particle Abstract KN. Henrichsen BEAM MOMENTUM AND BETATRON FREQUENCIES IN LHC FIELD DISPLAY SYSTEM FOR THE FORECAST OF 9 @5 LHC Note 308 CERN AT/95-02 (MA) CERN'AT'95'°2