Speaker
Mr
Aleksandr Savchenko
(NRNU MEPhI Moscow)
Description
We continued our investigation of the non-dipolarity of channeling radiation (CR) at GeV beam energies [1] which remarkably change the CR spectrum and its intensity [2]. The experimental proof that CR and coherent bremsstrahlung (CB) substantially influence the output of positrons at conversion of γ-radiation into e+e- pairs in crystalline targets has been given at the KEK B facility [3]. An advanced concept to create a non-conventional intense positron source, the so-called hybrid setup, has been suggested long time ago [4]. Motivated by the pending CLIC and ILC projects, active discussions of this concept did not drop and stay actual up to now [5,6,7].
Besides de-channeling [8,9], the non-dipolarity of CR at GeV beam energies cannot be neglected in realistic simulations of CR spectra [10] being the initial point for any evaluation of positron production via conversion of γ-radiation into e+e- pairs [5].
We for the first time consider the non-dipolarity of axial CR at electron beam energy of several GeV carrying out simulations based on realistic axial continuous potentials.
References
1. B. Azadegan and W. Wagner, “Non-dipolarity of channeling radiation at GeV beam energies”, 7th Int. Conf. “Channeling 2016”, Sirmione, Italy, Nucl. Instrum. Methods B 402 (2017) 63.
2. N. F. Shul’ga, L. É. Gendenshteĭn, I. I. Miroshnichenko et al., Sov. Phys. JETP 55(1) (1982) 30 (and Refs. therein)
3. T. Suwada, M. Satoh, K. Furukawa et al., Phys. Rev. Spec. Topics – Accelerators and Beams 10 (2007) 073501 (and Refs. therein)
4. R. Chehab, F. Couchot, A. R. Nyaiesh et al., Proc. IEEE PAC’89, Chicago, IL, USA, 1989, p. 283.
5. B. Azadegan, S. A. Mahdipour and W. Wagner, “Simulation of positron energy spectra generated by channeling radiation of GeV electrons in a tungsten single crystal”, Journal of Physics: Conf. Series 517 (2014) 012039.
6. A. Potylitsyn et al., “Undulator-based and crystal-based gamma radiation sources for positron generation”, Journal of Physics: Conf. Series 517 (2014) 012041.
7. I. Chaikovska, R. Chehab et al., „Optimization of a hybrid positron source using channeling“, Nucl. Instrum. Methods B 402 (2017) 58 (and Refs. therein)
8. H. Backe et al., Nucl. Instrum. Methods B 266 (2008) 3835.
9. O. V. Bogdanov and S. B. Dabagov, Journal of Physics: Conf. Series 357 (2012) 012029.
10. B. Azadegan and W. Wagner, Nucl. Instrum. Methods B 342 (2015) 144.
Primary author
Dr
Behnam Azadegan
(Hakim Sabzevari University, Sabzevar, P.O. Box 397, Iran)
Co-authors
Mr
Aleksandr Savchenko
(NRNU MEPhI Moscow)
Ms
Shafiee
(Hakim Sabzevari University, Sabzevar, P.O. Box 397, Iran)
Dr
Wolfgang Wagner
(NRNU MEPhI Moscow)
