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Cavity Optimization for Compact Accelerator-based Free-electron Maser

Cavity Optimization for Compact Accelerator-based Free-electron Maser. Dan Verigin TPU In collaboration with A. Aryshev, S. Araki, M. Fukuda, N. Terunuma, J. Urakawa KEK: High Energy Accelerator Research Organization P. Karataev John Adams Institute at Royal Holloway, University of London

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Cavity Optimization for Compact Accelerator-based Free-electron Maser

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  1. Cavity Optimization for Compact Accelerator-based Free-electron Maser Dan Verigin TPU In collaboration with A. Aryshev, S. Araki, M. Fukuda, N. Terunuma, J. Urakawa KEK: High Energy Accelerator Research Organization P. Karataev John Adams Institute at Royal Holloway, University of London G. Naumenko, A. Potylitsyn, L. Sukhikh Tomsk Polytechnic University K. Sakaue Waseda University

  2. A.P. Potylitsyn, Phys. Rev. E 60 (1999) 2272. Compact Accelerator-based Free-Electron Maser

  3. LUCX, compact linear accelerator S. Liu, M. Fukuda, S. Araki, N. Terunuma, J.Urakawa, K. Hirano, N. Sasao, Nuclear Instruments and Methods A 584 (2008) 1-8.

  4. Diffraction radiation (DR) appears when a charged particle moves in the vicinity of a medium • IDR ~ Ne Diffraction Radiation

  5. CDR is generated by sequence of charged bunches • ICDR ~ Ne2 Coherent Diffraction Radiation

  6. 2 6-way crosses • 2 4D vacuum manipulation systems • 2 aluminum mirrors CDR on LUCX

  7. closed opened CDR on LUCX: Cavity length scan

  8. Si Al M.I. Markovic, A.D. Rakic. Determination of optical properties of aluminium including electron reradiation in the Lorentz-Drude model. Opt.and Laser Tech., v. 22, No. 6, 394-398, 1990. R.T. Kinasewitz, B.Senitzky. Investigation of complex permittivity of n-type silicon at millimeter wavelengths. J. Appl. Phys., v. 54, No. 6, 3394-3398, 1983. Transmission calculation

  9. Mirror test bench

  10. Si Al Mirrror diameter = 100 mm Thickness of Si substrate should be more than 100 mkm for durability New mirror design

  11. ESCDR = a ECav – addition to electric field by stimulation (depends on electric field stored in cavity) • EDR – electric field generated by single bunch • d – loss in resonator • Etot,2 = d EDR + EDR + ad EDR = EDR (1 + d (1+a)) = EDR (1+b) – electric field in resonator after second bunch • Etot,i = EDR (1-bi)/(1-b) – electric field in resonator after i-th bunch Stimulation ChitrladaSettakorn, Michael Hernandez, and Helmut Wiedemann Stanford Linear Accelerator Center, Stanford University, Stanford, CA 94309, SLAC-PUB-7587 August 1997

  12. Etot,i = EDR (1-bN)/(1-b) di-N – where N is number of bunches in train (i>N) Cavity decay A. Aryshev, et. al., IPAC’10, June 2008, Kyoto, Japan, MOPEA053

  13. Thank you for attention

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