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Overview of FEL activities in RRC “Kurchatov Institute”

Overview of FEL activities in RRC “Kurchatov Institute”. S.T. Belyaev. Introduction. Inverse FEL project in 1980 – beginning of FEL activities in Kurchatov Institute. Research agreements KI – UCLA since 1990. Systematic research on SASE FEL and IFEL physics.

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Overview of FEL activities in RRC “Kurchatov Institute”

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  1. Overview of FEL activities in RRC “Kurchatov Institute” S.T. Belyaev Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  2. Introduction • Inverse FEL project in 1980 – beginning of FEL activities in Kurchatov Institute. • Research agreements KI – UCLA since 1990. Systematic research on SASE FEL and IFEL physics. • Some proof-of-principle experiments on FEL were completed with other collaborators as well. • List of recognized FEL experiments in the world (Table 1) include two SASE FEL experiments we made with our collaborators, where first experimental confirmation of possibility of SASE regime was demonstrated in optics. Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  3. Existing Free Electron Lasers in 2005 From FEL 2005 Conference Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  4. Content • Proof-of-principle experiments on FELs based on using KIAE undulators. • UCLA-Kurchatov Institute 16 µm SASE FEL • UCLA-KI-LANL 12 µm SASE FEL • FOM-KI-IAP GHz FEM • UCLA-KI high acceleration rate Inverse FEL • Main properties and parameters of constructed and used undulators • On some technological achievements • Advanced hybrid undulator schemes with side magnets • High precision undulator magnetic field measurements • Special designs for X-SASE FEL • Summary and Conclusion Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  5. Proof-of-principle FEL experiments based on KI undulators UCLA-Kurchatov Institute 16 µm SASE FEL (1996) KIAE-1.5-1 undulator on beamline Schematic cut-away view with two sets of permanent magnets Schematic of the FEL installation Table of electron beam, undulator and FEL characteristics Radiation Intensity Measurement Main results: First evident SASE lasing with 6 times amplification over spontaneous emission, 16 cm power gain length, good agreement with SASE FEL theory (NIM A407 (1998) 257). Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  6. 1 2 • Proof-of-principle FEL experiments based on KI undulators UCLA-Kurchatov Institute-LANL 12 µm SASE FEL (1998) Schematic of the FEL installation KIAE-2 undulator performance 1 – focusingmagnets; 2 – main magnets Radiation Intensity vs Current Electron beam, undulator and FEL characteristics Main results: Experimentally measured largest (3x105) gain at optical wave length in a single pass FEL starting from noise. Amplification and fluctuations of the output intensity show good agreement with SASE theory (PRL 81 (1998) 4867). Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  7. Proof-of-principle FEL experiments based on KI undulators High power FEL in mm-range for fusion (1998) FOM-KI-IAP Schematic of FEM as a prototype of high power, long pulse, rapid tunable, high efficiency source KIAE-4 undulator performance Electron beam, undulator and FEL characteristics Main results: 730 kW, 230 GHz in short (12 µs) pulses were achieved (PRE 59 (1999) 6058). Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  8. Proof-of-principle FEL experiments based on KI undulators UCLA-Kurchatov Institute Inverse FEL experiment (2004) Undulator characteristics Schematic of IFEL beamline first section second section corrector Output energy spectrum Common view of the undulator Beams characteristics Main experimental results: 70 MeV/m acceleration rate, possibility for cascading (PRL 94 (2005) 154801) Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  9. Main properties and parameters of constructed and used undulators • Pure permanent magnet and hybrid undulators were constructed with following specific characteristics: • Record high field strength due to original schemes • Tunability and high field homogeneity • Internal focusing, mainly equal focusing in both transverse directions • Compactness and stability in time • High precision experimental method of magnetic field measurements • Full simulation of e.b. dynamics in undulators Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  10. Main properties and parameters of constructed and used undulators Main data on some constructed undulators Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  11. On some technological achievements • Advanced hybrid undulator schemes with side magnets of different types providing high field strength and focusing profiles Schematic of the magnetic field plot with side magnets configuration 3D hybrid undulator construction 1 – iron pole; 2 – main PM; 3 – side PM inserts; 4 – side PM; 5 – additional PM bricks Main results: side magnet arrays, satellite magnets and profiled poles could provide an effective focusing field profile and could enhanced undulator fields (NIM A341 (1994) 462). Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  12. On some technological achievements • High sensitivity wire method for precision magnetic field integrals measurements Schematic of the method with special wire displacement detector (4) Wire displacement detector scheme 0.1 mm IR diode mask wire photodiode 0.3 mm Wire detectors characteristic Focusing strength measurements Main results: novel type of optical detector significantly simplifies the system, focusing strength of an undulator can be measured for both transverse directions (NIM A341 (1994) 470). Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  13. On some technological achievements • Developing of the wire method for long undulators Magnetic field strength deflections induced by wire sag which can be eliminated by mathematical correction Schematic of the method with wire sag Other potentials of wire method: Quadrupole and sextupole optical axis measurements and focusing elements alignment Main results: wire technique can be used for testing of long undulators, mathematical corrections of wire sag was suggested (NIM A407 (1998) 443). Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  14. Special design for X-SASE-FELs • Problem of wakefields induced losses of e-beam in narrow channels Radiation power of the projected planar LCLS undulator and helical undulator designed by Kurchatov Institute Solid – no wake fields; Dotted – resistive wall wake fields; Dashed - resistive wall+surface roughness wake fields. Main results: KI helical undulator construction provides shorter saturation length (~62m) in comparison with LCLS one (82m) and reasonably less sensitivity to wakefields (AIP Conference Proceedings 581 (2001) 221). Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  15. Design of special undulators adequate to LCLS requirements • Planar p.m. hybrid undulator construction providing high fields Cut away view of the undulator structure Magnetic characteristics of the undulator Main simulation results: undulator gap larger than in LCLS project is possible (AIP Conference Proceedings 581 (2001) 73). Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  16. Design of special undulators adequate to LCLS requirements • Helical p.m. hybrid undulator construction providing high fields Cut away view of the undulator structure Magnetic characteristics of the undulator Main simulation results: helical construction is possible which can be less sensitive to wake-field losses of electron beam in small gap channels (AIP Conference Proceedings 581 (2001) 73). Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  17. Comments • Some theoretical developments concerning new FEL system schemes will be described by Prof. A.Varfolomeev in the next report of our institute. • Original superconducting helical undulator construction will be presented by Prof. V. Keilin. Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

  18. Summary and Conclusion • Kurchatov Institute was making FEL research for many years, took part in known experiments on SASE FELs and IFEL. • Kurchatov team could use this experience in future developments of new light sources in collaboration with DESY teams. Russia - DESY Workshop on New generation light sources, Jule 3-4, 2006, Moscow

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