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| THPSC048 | Measurement of Gamma Beams Profile by Cherenkov Radiation in Fibers | 638 |
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Funding: This work was partially supported by the Russian Ministry of Education and Science within the program 'Nauka' Grant 3.709.2014/K and by RFBR Grant 15-52-50028-YaFa. Results of gamma beam profile experimental investigations by measuring of Cherenkov radiation* generated in a fiber with 0.6 mm thickness and in a glass rod with 5 mm diameter are presented. These experiments were carried out on bremsstrahlung beam of the linear accelerator 'Philips SL-75' with 6 MeV energy and 4 Gr/min dose rate at 1 m distance. In works ** and *** authors have showed feasibility of Cherenkov radiation applying for high energy beam diagnostics. In our work the Cherenkov radiation yield dependence on the fiber orientation relative to the beam axis was investigated and showed that the maximal light yield corresponds to the angle between fiber and beam axes closed to the Cherenkov angle. When dose rate is higher than 1 Gr/min at 1 m distance one can register a light yield for the fiber orientation even less than Cherenkov angle. We suppose that the observed effect is connected with generating of electromagnetic shower by initial photons. Proposed technique of bremsstrahlung and electron **** beams profile measurements differs from well-known techniques based on ionization chambers due to its insensitive to low energy part of the bremsstrahlung spectrum and to undesirable background. Using this technique for beam profile scanning it is possible to construct compact and noise insensitive device relative to the well-known systems. It is also possible to reach submillimeter resolution with this device. * Jelley J V, Cherenkov Radiation and its Application, 1958, Pergamon Press. ** Wulf F, Korfer M, Proc. of DIPAC 2009, p. 411. *** A. Murokh, R. Agustsson etc., Proc of IPAC2012, p.996. **** A V Vukolov, A I Novokshonov, A P Potylitsyn, S R Uglov, Proc of RREPS-15, 2015, Sain-Petersburg |
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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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