V. A. Rezvov

Synchrotron radiation parameters registration using beam cross-section image detector: The first experiments

Abstract Possibilities of non-destructive recording of synchrotron radiation (SR) beam parameters using Beam Cross-section Image Detector (BCID), which was designed before for the diagnostic of charged beams, have been estimated. The basic principles of the work of this detector are described. A developed detector for visualization of synchrotron radiation beam cross-section image is described briefly. The first tests of this detector were provided on SR beam at LURE (Orsay). Some of the results of these tests are described and discussed. The results obtained show the possibility of the use of ionization crossection detector for a prompt beam cross-section observation. Computer data processing of beam cross-section TV image make it possible to obtain size, position and shift of gravity centre of the SR beam, angle of beam downfall on the target continuously.

Determination of the electron beam size at the Kurchatov synchrotron radiation source using an X-ray refractive lens

The electron beam size in the storage ring of the Kurchatov synchrotron radiation source at 2.5 GeV is determined using an x-ray two-dimensional parabolic refractive lens. The vertical size of the electron beam of the storage ring is found to be 270 μm, which exceeds the corresponding design value 140 μm (at a betatron coupling of 1%). The difference is explained by the imperfect geodetic arrangement of ring elements and the incomplete adjustment of the ring.

Visualization and on line monitoring of geometric parameters of beams at KSRS

Abstract On the basis of developed hardware and software we investigate the opportunity of on line registration of geometric parameters of low intensity SR beam and electron beams in single shot mode. Ionization and luminescence detectors form real optic image of a beam cross section. The image is registered by a TV camera, digitized and processed by a computer. Gray scale image and profiles of a beam are represented. Accumulation and statistic processing of the data give the possibility to increase the sensitivity of the hardware and to calculate the average position of the beam gravity center, dispersion and statistic uncertainty.

Processing of amplitude spectra in measurements with ionizing radiation by low energy resolution detectors

A method using intermediate processing of amplitude (energy) spectra is described. The method is an alternative to the known differential discrimination method, which is widely applied in measurements of EXAFS spectra and in Mössbauer and diffraction measurements. The method is efficient in cases in which the radiation spectrum contains lines poorly resolved in the used detector. For example, if weak fluorescence of a low-concentration impurity is detected in a sample against the background of intense fluorescence of the matrix, the described method allows one to noticeably improve the quality of the obtained information.

Development of the system for stabilizing the position of a synchrotron radiation beam

The development of the system for stabilizing the vertical position of the “white” synchrotron radiation beam on the 2.5-GeV SIBERIA-2 storage ring at the Kurchatov Center of Synchrotron Radiation is considered. Two versions of the multichannel stabilizing system that are currently in operation are described. In the first, the procedures executed when introducing the first beam-stabilizing feedback loop in one channel are merely replicated for all other beamlines. In this case, an individual computer transmitting information to the control system of the storage ring via the local-area network is used in each beamline to process information from a beam position sensor equipped with a video camera. The other version of the stabilizing system is based on a central computer with a multichannel input card for video images. In this version, beam position sensors are sequentially interrogated by the computer and results of data processing are transmitted to the control system of the storage ring.

Determination of the Electron Beam Size at the Kurchatov Synchrotron Radiation Source Using an Edge Screen

The electron beam size of the 2.5-GeV storage ring of the Kurchatov Synchrotron Radiation Source was measured using a fixed edge screen. The obtained vertical beam size of 190 μm and the corresponding calculated value of 198 μm (for 2% betatron coupling) almost coincide within the experimental error.

Detector of ionizing beam parameters based on an open ICT: visualization and processing

We proposed and developed a detector for on line non- destructive monitoring of geometrical parameters of ionizing beams. The detector gives the size of a beam cross-section, cross-section density distribution, position of the cross- section gravity center and its displacement. The detector contains electrostatic extractor and analyzer as well as open Image Converter Tube (ICT) ICT is made of two Micro Channel Plates (MCP) with luminescence screen. Detector is placed within beam line at residual gas pressure 10-4 - 10-6 Torr. The residual gas works as a target. Electron optic analyzes ions on energy, which they get in extractor electric field. The ion picture of the beam under investigation is put on input MCP. The screen of the ICT forms image of the beam. TV camera registers this image. Then the image is processed in a computer. Computer processing gives one the possibility to have numeric beam parameters. Statistical processing makes the sensitivity better and estimates displacement of the beam with the accuracy of order of a few microns. The detector was investigated on different particles accelerators and on synchrotron radiation sources. Modified detector gave a possibility to measure microstructure of cyclotron beam. The detectors can be used on scientific and industrial accelerators.