RuPAC-2010 - List of Keywords (laser)

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laser

Paper	Title	Other Keywords	Page
TUCHZ02	Maintenance of ITEP-TWAC Facility Operation and Machine Capabilities Development	ion, acceleration, proton, injection	32
	N. N. Alexeev, P. N. Alekseev, A. Balabaev, V. I. Nikolaev, Yu. A. Satov, V. A. Schegolev, B. Y. Sharkov, A. Shumshurov, V. P. Zavodov ITEP, Moscow
	Funding: This work is supported by ROSATOM The ITEP-TWAC facility operation with proton and heavy ion beams for ~4000 hours per year in several modes of beam acceleration and accumulation is determined by present-day demands of different beam users in the frame of current machine resources. Displacement of state interests from fundamental research to strictly-practical tasks stimulates multimode operation of accelerators with trend of beam using for applications. Mastering of Ag¹⁹⁺ ions acceleration in the UK ring up to the energy of 100 MeV/u and Fe²⁶⁺ beam stacking in the U-10 ring at the energy of >200 MeV/u in addition to routine operation with C⁶⁺ beam at energy of 200-400 MeV/u with fast and slow extraction of circulating beam clear the way to beam using for a lot of applications requiring extension of the facility experimental area. Development of laser ion source technology takes aim at high current and high charge state ions generation for elements with A ~60 to be effectively stacked in the U-10 ring with multiple charge exchange injection technique. The machine maintenance efforts and current activities aiming at both subsequent improvement of beam parameters and extending of beam applications are presented
	Slides

TUPSA010	Attosecond and Femtosecond Electron Bunches Obtainable Upon Field Emission in a Combined Quasi-static and Laser Electric Field	electron, cathode, radiation, bunching	56
	V. A. Papadichev LPI, Moscow
	Short pulses of electrons of femtosecond and attosecond duration are necessary for numerous applications: studying fast processes in physics, chemistry, biology and medicine. It was shown that it is possible to generate electron bunches due to field emission of T/2 - T/8 duration (T is the period of laser oscillation), i.e., 400 as to 20 fs with neodymium or carbon dioxide lasers. Currents of 10 mA to 10 A can be obtained from single-spike cathode and up to 10 kA with a multi-spike cathode. Further bunching occurs due to velocity modulation in the bunch by laser electric field resulting in 6 as for neodymium laser and 120 as for carbon dioxide laser*. Transverse focusing of such bunches is discussed. Heating of spikes for single-pulse regime is several degrees and therefore it is possible to generate a sequence of electron bunches (up to 100 – 500 pulses). They can be used in diffractometry and after acceleration to 3 – 4 MeV for generation of short pulses of VUV and soft X-ray radiation in periodic fields or as a relativistic mirror. Influence of space-charge force are studied using simple analytical solutions and methods to compensate it are proposed. P. Emma. Proc. EPAC04, p. 225, Lucerne, Suisse. V. A.Papadichev. Proc. EPAC08, p. 2812, Genoa, Italy. * V. A.Papadichev. Proc. EPAC08, p. 2815, Genoa, Italy.

TUPSA011	Hollow Photocathode Concept for E-gun	cathode, electron, emittance, vacuum	59
	M. A. Nozdrin, N. Balalykin, V. Minashkin, G. Shirkov, E. Syresin, G. V. Trubnikov JINR, Dubna, Moscow Region J. Huran Slovak Academy of Sciences, Institute of Electrical Engineering, Bratislava
	Photocathodes are the key devices for high-quality electron bunches generation. Such bunches are needed as initial electron source in contemporary linear accelerators. In all cases there are several important parameters: fast response time, quantum efficiency, long lifetime, low thermal emittance, minimal effect on RF properties of the accelerating system. In this paper the new concept of the photocathode is proposed – hollow (absolutely transparent for the laser beam) photocathode. Such cathode geometry allows quantum efficiency rising due to surface photoelectric effect which is concerned with normal to material surface wave electric field multiplier. Usability investigation experimental results for both hollow photocathodes made of bulk materials (Nb, Cu) and by thin-film technology (CsITe and diamond-like carbon as film on copper substrate) are given. After Nb hollow photocathode irradiation by a laser beam (Lambda = 266 nm, tau pulse = 15 ns, frequency 1 Hz) a charge of 64nC was extracted. Backside irradiation radically simplifies laser beam targeting on emitting surface, accelerator equipment adjustment and allows photocathode working surface laser cleaning.

TUPSA020	Development of Injector for ITEP Heavy Ion Synchrotron Based on Laser Plasma Generator	ion, plasma, target, heavy-ion	86
	Yu. A. Satov, N. N. Alexeev, A. Balabaev, A. D. Belokurov, I. D. Hrisanov, B. Y. Sharkov, A. Shumshurov, A. A. Vasilyev ITEP, Moscow
	A schematic diagram of heavy ion injector based on laser ion sources is described. Two different basic laser configurations used in ITEP synchrotron. First laser excels in simplicity and consists of CO2 free-running laser that is applied for carbon target plasma heating and ionization at laser power density q=3·1012W/cm² to create high current C⁴⁺ ion beam. Second master oscillator-amplifier (MOPA) laser configuration intends for production super high laser intensity at a target to provide considerable charge state in a plasma of heavy elements (Al, Fe, Ag etc). This laser configuration is founded on original physical principle* that simplifies the installation and ensures high reliability for long term operation. Laser characteristics for the different laser scheme and ion current for injector outlet beam of C⁴⁺ and Ag⁺19 are shown in this paper. The latter was accelerated in synchrotron for energy up to 100 MeV/u. * K. N. Makarov et al. Quantum Electronics (Russian), 2001, 31 (1), pp. 23-29

WECHY01	Status and Prospects of the Novosibirsk FEL Facility	electron, undulator, radiation, free-electron-laser	133
	N. Vinokurov, E. N. Dementyev, B. A. Dovzhenko, A. A. Galt, Ya. V. Getmanov, B. A. Knyazev, E. I. Kolobanov, V. V. Kubarev, G. N. Kulipanov, L. E. Medvedev, S. V. Miginsky, L. A. Mironenko, V. K. Ovchar, B. Z. Persov, V. M. Popik, T. V. Salikova, M. A. Scheglov, S. S. Serednyakov, O. A. Shevchenko, A. N. Skrinsky, V. G. Tcheskidov, M. G. Vlasenko, P. Vobly, N. S. Zaigraeva BINP SB RAS, Novosibirsk
	Multiturn energy recovery linacs (ERL) looks very promising for making ERLs less expensive and more flexible, but have serious intrinsic problems. At this time only one multiturn ERL exists. This Novosibirsk ERL operates with two orbits and two free electron lasers now. The Novosibirsk terahertz radiation user facility provides 0.5 kW average power at 50 - 240 micron wavelength range. Different users work at six stations. Two another orbits and third free electron laser are under construction. The operation experience revealed specific problems of ERLs(especially, of multiturn ones). Some solutions were proposed recently.
	Slides

WEPSB002	JINR Activity in FEL	radiation, undulator, photon, electron	175
	E. Syresin, G. A. Chelkov, E. V. Ivanov, M. N. Kapishin, E. A. Matyushevskiy, N. A. Morozov, G. Shirkov, G. V. Trubnikov, M. V. Yurkov JINR, Dubna, Moscow Region O. I. Brovko JINR/VBLHEP, Moscow
	Different methods for diagnostic of ultrashort electron bunches are developed at JINR-DESY collaboration within the framework of the FLASH and XFEL projects. Photon diagnostics developed at JINR-DESY collaboration for ultrashort bunches are based on calorimetric measurements and detection of undulator radiation. The MCP based radiation detectors are effectively used at FLASH for pulse energy measurements. The infrared undulator constructed at JINR and installed at FLASH is used for longitudinal bunch shape measurements and for two-color lasing provided by the FIR and VUV undulators. The JINR also participates in development and construction of Hybrid Pixel Array Detector on the basis of GaAs sensors. The JINR develops a project which is aimed at preparation of conceptual project and simulations of accelerator complex, based on a 0.7 GeV superconducting linear accelerator, for applications in nanoindustry, mainly for extreme ultraviolet lithography using kW-scale Free Electron Laser (FEL) light source.

WEPSB003	Proposal for an Accelerator Complex for Extreme Ultraviolet Nanolithography Using kW-scale FEL Light Source	radiation, electron, free-electron-laser, undulator	178
	E. Syresin, N. Balalykin, U. A. Budagov, I. F. Lensky, A. G. Olshevsky, G. Shirkov, A. P. Sumbaev, G. V. Trubnikov JINR, Dubna, Moscow Region M. V. Yurkov DESY, Hamburg
	The project is aimed at construction of accelerator complex, based on a 0.7 GeV superconducting linear accelerator, for applications in nanoindustry, mainly for extreme ultraviolet lithography using kW-scale Free Electron Laser (FEL) light source. The project involves construction of a 0.7 GeV superconducting linear accelerator to produce coherent FEL radiation for extreme ultraviolet nanolithography at a wavelength of 13.5 nm and an average radiation power of 0.5 kW. The application of kW-scale FEL source permits realizing EUV lithography with 22 nm, 16 nm resolutions and beyond. The project for construction of an accelerator complex for EUV lithography is based on the technology realized on FEL FLASH (Free Electron Laser in Hamburg) facility at DESY (Hamburg).