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Paper Title: Infra-Red Control and Diagnostics of the Beams and Bunches of Charged-Particles
Primary Author: A.Maltsev
Institution: Joint Institut for Nuclear Research, Laboratory of High Energies, 141980 Dubna, Russia
Secondary Authors and Institutions: M.Maltsev, M.Goussakova
Working Groups Operations, reliability, instrumentation & injection

We present the methods and systems of nondisruptive diagnostics and study of charged-particle (electron, electron-ion, and proton) bunches or beams based on the use of their synchrotron radiation in a wide spectral range, from the ultraviolet to the far long-wave infrared region [1,2].

Methods for measuring the current and geometrical parameters and estimating the energy parameters of beams in ring accelerators using synchrotron radiation are reviewed, together with the information- measuring systems designed to detect synchrotron radiation and realize these methods.

The practical possibilities of infrared synchrotron methods and systems of diagnostics are demonstrated for the example of the low-energy (electron energy E = 2.5 - 20 MeV, electron orbit R = 40 - 4 cm) Electron-Ion Ring Accelerator (EIRA) of JINR.

The synchrotron radiation spectrum that is used mainly in the infrared region (wave length range > 1 mkm). The detection systems incorporate specially designed infrared-optical elements: a high-vacuum window of optical ceramics (analog IRTRAN) and broad-band, long-focus optical channels. The radiation is detected in the spectral region 0.3 - 45 mkm by infrared detectors operating at low temperature or room temperature. Results are presented on the measurement of the number of electrons in the bunch, the equilibrium radius and dimensions of the small cross section of ring bunch, and the angular divergence of the synchrotron radiation relative to the median plane of the ring bunch.