IPAC2013 - List of Authors (Strikhanov, M.N.)

Paper	Title	Page
MOPME062	UV and X-ray Diffraction Radiation for Submicron Noninvasive Diagnostics	616
	D.Yu. Sergeeva, M.N. Strikhanov, A.A. Tishchenko MEPhI, Moscow, Russia
	Funding: This work was partially supported by Russian Ministry of Education and Science (State contract 12.527.12.5002). Diffraction radiation (DR) arises when a charged particle moves near a target. The theory of X-ray DR from single particles was created in [, ], and recently the theory has been developed for bunches [*]. DR from relativistic particles is used for noninvasive bunch diagnostics and also for creating new and effective sources of radiation, including Free-electron laser based on the Smith-Purcell effect. In the present work we explore theoretically DR from the bunch of ultrarelativistic charged particles at X-ray and UV frequencies domains. It is shown that incoherent part of form-factor, describing the effect of N electrons in bunch, exists and differs from the unity. The coherent part of radiation depends on transversal size of the bunch as ratio of the Bessel function to its argument. The coherence effects are proved to be important up to the wavelengths much less than transversal size of the bunch. The results obtained open the possibility to diagnose bunches of the submicron size with very high accuracy. A.A. Tishchenko et al, PLA. 359 (2006) 509. A.P. Potylitsyn et al, Diffraction radiation from relativistic particles, Springer, 2010 * D.Yu. Sergeeva et al, Proc. Channeling-2012, p.52, 2012

MOPME063	Backward X-ray Transition Radiation from Multilayered Target for Submicron Beam Diagnostics	619
	A.A. Tishchenko, D.Yu. Sergeeva, M.N. Strikhanov MEPhI, Moscow, Russia K.O. Kruchinin Royal Holloway, University of London, Surrey, United Kingdom
	Funding: This work was partially supported by Russian Ministry of Education and Science (State contract 12.527.12.5002). Backward transition radiation (TR) is a TR arising in the direction of mirror reflection relative to the charged particles trajectory. Therefore for oblique incidence it can be emitted under big angles which is useful from point of view of measuring of the radiation. In spite of the fact that backward TR in X-ray frequency domain is much weaker than forward TR [], it has recently been proposed by A.P. Potylitsyn and others [] as an instrument for submicron electron beam diagnostics. In this work we propose to use the multilayered target in order to enhance the resulting radiation, i.e. to use resonant backward X-ray TR. So far X-ray TR has not been explored theoretically for backward geometry. It is shown that the expressions obtained coincide in special case of forward resonant X-ray TR with the results by L. Durand () and X. Artru (*). We explore the spectral and angular characteristics of resonant backward X-ray TR form point of view of submicron beam diagnostics for the ultrarelativistic charged particles bunches. The role of absorption in the target material and also the coherent and incoherent parts of the radiation is analyzed A.A. Tishchenko et al, NIMB 227 (2005) 63. L.G. Sukhikh et al, J of Phys: Conf. Ser. 236 (2010) 012011. * L. Durand, Phys Rev D11 (1975) 89. **** X. Artru et al, Phys Rev D12 (1975) 1289.

Paper

Title

Page

UV and X-ray Diffraction Radiation for Submicron Noninvasive Diagnostics

616

D.Yu. Sergeeva, M.N. Strikhanov, A.A. Tishchenko
MEPhI, Moscow, Russia

Funding: This work was partially supported by Russian Ministry of Education and Science (State contract 12.527.12.5002).
Diffraction radiation (DR) arises when a charged particle moves near a target. The theory of X-ray DR from single particles was created in [*, **], and recently the theory has been developed for bunches [***]. DR from relativistic particles is used for noninvasive bunch diagnostics and also for creating new and effective sources of radiation, including Free-electron laser based on the Smith-Purcell effect. In the present work we explore theoretically DR from the bunch of ultrarelativistic charged particles at X-ray and UV frequencies domains. It is shown that incoherent part of form-factor, describing the effect of N electrons in bunch, exists and differs from the unity. The coherent part of radiation depends on transversal size of the bunch as ratio of the Bessel function to its argument. The coherence effects are proved to be important up to the wavelengths much less than transversal size of the bunch. The results obtained open the possibility to diagnose bunches of the submicron size with very high accuracy.
* A.A. Tishchenko et al, PLA. 359 (2006) 509.
** A.P. Potylitsyn et al, Diffraction radiation from relativistic particles, Springer, 2010
*** D.Yu. Sergeeva et al, Proc. Channeling-2012, p.52, 2012

MOPME063

Backward X-ray Transition Radiation from Multilayered Target for Submicron Beam Diagnostics

619

A.A. Tishchenko, D.Yu. Sergeeva, M.N. Strikhanov
MEPhI, Moscow, Russia
K.O. Kruchinin
Royal Holloway, University of London, Surrey, United Kingdom

Funding: This work was partially supported by Russian Ministry of Education and Science (State contract 12.527.12.5002).
Backward transition radiation (TR) is a TR arising in the direction of mirror reflection relative to the charged particles trajectory. Therefore for oblique incidence it can be emitted under big angles which is useful from point of view of measuring of the radiation. In spite of the fact that backward TR in X-ray frequency domain is much weaker than forward TR [*], it has recently been proposed by A.P. Potylitsyn and others [**] as an instrument for submicron electron beam diagnostics. In this work we propose to use the multilayered target in order to enhance the resulting radiation, i.e. to use resonant backward X-ray TR. So far X-ray TR has not been explored theoretically for backward geometry. It is shown that the expressions obtained coincide in special case of forward resonant X-ray TR with the results by L. Durand (***) and X. Artru (****). We explore the spectral and angular characteristics of resonant backward X-ray TR form point of view of submicron beam diagnostics for the ultrarelativistic charged particles bunches. The role of absorption in the target material and also the coherent and incoherent parts of the radiation is analyzed
* A.A. Tishchenko et al, NIMB 227 (2005) 63.
** L.G. Sukhikh et al, J of Phys: Conf. Ser. 236 (2010) 012011.
*** L. Durand, Phys Rev D11 (1975) 89.
**** X. Artru et al, Phys Rev D12 (1975) 1289.