| Paper | Title | Page |
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| TUPSA051 | Form-factor Determination of an Arbitrary Bunch Sequence for the Coherent Radiation Calculation | 322 |
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| It is well known that the coherent effect occur when charged particles in a bunch radiate in phase. This is accompanied by a quadratic increase in the radiation intensity and significantly influences the radiation spectrum. The coherent radiation is characterized by a form factor, which is the coefficient mainly depending on the ratio of bunch dimensions to the observed radiation wave length. The form factors will be different for the synchrotron and transition radiation because of their different nature of radiation. Now electron accelerators that produced beams with a sub-picosecond bunch length and a picosecond distance between them already exist. Through the appearance of interference between radiation from such a sequence of bunches, the total intensity is no longer equal to the sum of radiation from each bunches. For this reason, it is essential to determine the form factor of an arbitrary electron bunch sequence. Herein the uniform bunch distribution will be the special case. In this report we describe an approach to obtaining the form factor of the arbitrary bunch sequence. | ||
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| THPSC050 | Possibilities of Diffraction Radiation Non-Destructive Diagnostics for Non- and Moderately Relativistic Beams | 644 |
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Funding: The work was partially supported by the RFBR grant No 15-52-50028. In order to design and construct new modern accelerators with high brightness beams, the development new non-destructive diagnostic tools for accelerated beams is required. Diffraction radiation (DR) is generated by charged particles moving in the vicinity of the conductive target. The DR technique is used successfully for non-destructive diagnostics for ultrarelativistic beams*,**. For non-relativistic and moderately relativistic charged particles beams (g ~ a few tens or less, g is the Lorentz factor) non-destructive DR diagnostics can be applied also if a beam intensity is high enough due to coherent effect. Intensity of coherent radiation is proportional to the squared bunch population. In this report estimations of non-destructive bunch diagnostics possibility based on DR for the beam parameters of a few machines are presented. Those estimations were performed for electron machine: PITZ project*** and laser wakefield accelerator****, and moreover for ESS proton linear accelerator*****. First evaluation of whole wavelength range DR from 4-mm-slit target gave about 56 mJ from one macro-pulse of ESS accelerator. Amplification of DR spectral-angular intensity due to coherent effect will be in N = 108 times than incoherent radiation from the same beam, where N is the bunch population. * P. Karataev et al., PRL 93 (2004) 244802 ** A. Cianchi et al., PRST-AB 14 (2011) 102803 *** http://pitz.desy.de **** B.S. Rao et al., PRST-AB 17 (2014) 011301 ***** https://europeanspallationsource.se |
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