RuPAC-2010 - List of Keywords (gun)

A B C D E F G H I K L M O P Q R S T U V W

gun

Paper	Title	Other Keywords	Page
TUPSA039	HV Electron Cooler for the NICA Collider	electron, acceleration, cathode, collider	125
	I. N. Meshkov, E. V. Ahmanova, A. G. Kobets, R. Pivin, A. Yu. Rudakov, A. V. Smirnov, N. D. Topilin, Yu. A. Tumanova, S. Yakovenko JINR, Dubna, Moscow Region A. A. Filippov Allrussian Electrotechnical Institute, Moskow A. V. Philippov, A. V. Shabunov JINR/VBLHEP, Dubna, Moscow region
	The goal of the cooling system of the NICA collider is to meet the required parameters of ion beams in energy range of 1 - 4.5GeV/u that corresponds to the 0.5 - 2.5 MeV of the electron energy. The electron cooler project is developed according to the world experience of similar systems consruction. The main peculiarity of the electron cooler for the NICA collider is use of two cooling electron beams (one electron beam per each ring of the collider) that never has been done before. The acceleration and deceleration of the electron beams is produced by common high-voltage generator. The cooler consists of three tanks. Two of them contain acceleration/deceleration tubes and are immersed in superconducting solenoids. The third one contains HV generator. The scheme of the electron cooler, its main parameters and operation regime are presented.

WECHB02	Review of the Diamond Light Source Timing System	booster, linac, photon, controls	144
	Y. S. Chernousko, P. Hamadyk, M. T. Heron Diamond, Oxfordshire
	Funding: Diamond Light Source Ltd The Diamond Light Source timing system utilises a central event generator with distributed event receivers at the equipment being controlled for all accelerator and beamline subsystems. This provides distributed fiducials with resolution of 8 nsec and stability of 8 psec. It is based on commercial hardware from Micro-Research, Finland. This paper describes the installed timing system and summarizes 5-year operational experience of the system. This includes the hardware and software, the distributing network, and the achieved precision and stability of the system. Developments in the timing system to support additional operational functionality of Diamond, including top-up operation, are also discussed.
	Slides

WECHZ03	Development of Electron Cooler Components for COSY	electron, secondary-beams, vacuum, proton	151
	V. V. Parkhomchuk, M. I. Bryzgunov, A. V. Bubley, V. G. Cheskidov, A. D. Goncharov, A. Kryuchkov, V. A. Polukhin, A. A. Putmakov, V. B. Reva, D. N. Skorobogatov BINP SB RAS, Novosibirsk
	Design, production and experiments with prototype of the 2 MV COSY electron cooler commponents reported. The system for transfer 40 kW power along acceleration tube described.
	Slides

WECHZ04	Results of Electron Cooling Beam Studies at COSY	electron, proton, injection, emittance	156
	V. Kamerdzhiev, J. Dietrich FZJ, Jülich C. Boehme UniDo/IBS, Dortmund M. I. Bryzgunov, V. B. Reva BINP SB RAS, Novosibirsk A. G. Kobets, I. N. Meshkov, A. Yu. Rudakov, A. O. Sidorin JINR, Dubna, Moscow Region
	Beam studies dedicated to electron cooling and related problems were carried out at COSY in April 2010. The newly installed Ionization Profile Monitor was used to study the dynamics of longitudinal and transverse electron cooling. Friction force measurements were performed. Beam lifetime was measured for different injection parameters, electron currents and working points. Position and angle scans of the electron beam were also performed. Results of the recent beam studies are reported and the plans for future studies are discussed.

WECHC01	Advance in the LEPTA Project	positron, electron, focusing, vacuum	166
	A. G. Kobets, E. V. Ahmanova, M. K. Eseev, V. Karpinsky, V. I. Lokhmatov, V. N. Malakhov, I. N. Meshkov, V. Pavlov, A. Yu. Rudakov, A. A. Sidorin, S. Yakovenko JINR, Dubna, Moscow Region
	The progress since RuPAC'2008 in Low Energy Positron Toroidal Accumulator (LEPTA) project at JINR is reported. The significant development of the facility includes an increase of circulating beam life time, fabrication and commissioning of improved injection system, manufacturing of positron transfer channel, test of low energy positron injector and positron trap. First positron injection into the ring is under preparation.
	Slides

WEPSB028	Booster Electron Cooling System of NICA Project	electron, ion, booster, emittance	230
	A. V. Smirnov, E. V. Ahmanova, I. N. Meshkov, R. Pivin, A. Yu. Rudakov, V. I. Shokin, A. O. Sidorin, N. D. Topilin, Yu. A. Tumanova, S. Yakovenko JINR, Dubna, Moscow Region A. V. Shabunov JINR/VBLHEP, Moscow
	Nuclotron-based Ion Collider fAcility (NICA) is the new accelerator complex being constructed on the JINR site. A few cooling systems are considered for the NICA project – electron one for the Booster-synchrotron and for Collider rings – both electron and stochastic ones. The main goal of the Booster electron cooler is a decrease of the longitudinal emittance from the injection value to the necessary value for acceleration to Nuclotron. The designed electron cooling system for Collider rings have to prevent the emittance growth due to the intrabeam scattering and to keep the average luminosity on the constant value. The peculiarity of electron cooling systems is the using of superconducting solenoids to provide the beam transportation in cooling sections.

WEPSB029	Electron Gun and Collector for 2 Mev Electron Cooler for COSY	electron, cathode, vacuum, controls	233
	A. V. Ivanov, M. I. Bryzgunov, A. V. Bubley, V. M. Panasyuk, V. V. Parkhomchuk, V. B. Reva BINP SB RAS, Novosibirsk
	COSY storage ring will be upgraded in 2011 by installation of a new electron cooler. Electron cooling will reduce energy spread of protons and so improve the precision of internal target experiments. Some of the most important parts of this new electron cooler are the electron gun and the collector, and they must satisfy several rigid requirements. Electron gun must provide high perveance electron beam with low transversal temperature and variable beam profile. The gun control electrode assembled of four separate sections will provide measurements of beam envelope along the transport section of the cooler. Displacement of corresponding part of the beam may be observed if alternating voltage is applied to each section. Collector should have high perveance, low secondary emission coefficient, and small dimensions. Wien filter is supposed to be installed before the collector to satisfy these requirements. In this case we can use high perveance small-scale collector with axially-symmetric magnetic field; secondary electrons will be absorbed in Wien filter. An additional vacuum pumping must be provided in the collector design.

THCHD01	55 MeV Special Purpose Race-Track Microtron Commissioning	linac, electron, radiation, klystron	316
	A. I. Karev, A. N. Lebedev, V. G. Raevsky LPI, Moscow L. Brothers, L. Wilhide VFCT, Covington, Kentucky A. N. Ermakov, A. N. Kamanin, V. V. Khankin, N. I. Pakhomov, V. I. Shvedunov MSU, Moscow N. P. Sobenin MEPhI, Moscow
	Funding: This work was supported by CRDF Grant #RP0-10732-MO-03 (LLNL) Results of Lebedev Institute 55 MeV special-purpose race-track microtron (RTM) commissioning are presented. RTM is intended for photonuclear detection of hidden explosives based on initiation of photonuclear activation and consequent registration of secondary gamma-rays penetrating possible screening substances. RF system is based on KIU-168 klystron with 6MW/6 kW pulsed/average power operating at 2856 MHz in self-oscillating mode with on-axis coupled standing wave bi-periodic accelerating structure in a feed-back loop. Maximum RF power is now at the level of 2.5 MW. With this RF power energy gain per pass of 5 MeV is provided and up to 10 mA pulsed beam current is obtained at RTM exit. The RTM control system is based on NI modules and LabView software. Beam diagnostic is provided by beam current monitors, by synchrotron radiation and by transition radiation. RTM tuning is achieved by adjustment of: (1) a current in steering coils, (2) an accelerating structure field level, (3) a focal power of solenoidal lens and quadrupole doublet, and (4) injection magnet current.
	Slides

THPSC010	The Electron Linear Accelerator LUE-200 - Driver the IREN Facility	electron, target, focusing, klystron	346
	V. Kobets, J. Boettcher, A. S. Kayukov, I. N. Meshkov, V. Minashkin, V. G. Pyataev, V. A. Shvets, V. N. Shvetsov, A. P. Sumbaev, V. N. Zamriy JINR, Dubna, Moscow Region P. V. Logachev, V. M. Pavlov BINP SB RAS, Novosibirsk V. Shabratov JINR/VBLHEP, Moscow
	It is reported on startup of the first stage of the Intense REsonance Neutron source installation (IREN) at the Frank Laboratory of Neutron Physics of the Joint Institute for Nuclear Research. The general scheme and current status of the electron linear accelerator with accelerating structure on a S-band traveling wave (f = 2856 MHz) are presented. Results of adjustment of the basic functional systems of the linac and the measured parameters of the beam (pulse current of a beam – 3.0 A, electron energy - 30 MeV; duration of a pulse current - 100 ns; rep. rate - 50 Hz) are reported. The integral neutron yield from nonmultiplying target reaches (3…5)*1010 n/s.

THPSC011	Investigation on the Electron Beam Formation in the Magnetron Gun with a Secondary-Emission Cathode Using the Masgnetic System Based on Permanent Magnets	cathode, electron, permanent-magnet, vacuum	349
	N. G. Reshetnyak, M. I. Ayzatskiy, V. N. Boriskin, I. A. Chertishchev, A. N. Dovbnya, N. A. Dovbnya, V. P. Romas'ko, V. Zakutin NSC/KIPT, Kharkov
	The paper presents the results of investigations on the electron beam formation in the magnetron guns with secondary-emission cathodes using the magnetic system based on annular permanent magnets. The magnetic system, made of NdFeB material, has 10 cm in length, external diameter of 80 mm, internal diameter of 60 mm and longitudinal magnetic field amplitude of 800 Oe. Experiments were carried out using the magnetron guns having cathodes with diameters from 6mm to 16 mm, 75 mm in length, and an anode of 56 mm in diameter. The cathode voltage was 15…25 kV. The experimental results have demonstrated that the magnetron guns with cathodes having 6mm, 10mm and 16 mm in diameter can form tubular electron beams. Under the cathode voltage of 18 kV the electron beam current is ~3.5…5 А. The beam current dependence on the voltage obeys to the "3/2" law. As the cathode voltage was increased to 22 kV, the beam current bunch generation and anode current of ~1.0 mks were observed. As a result of investigations a compact magnetron gun with a secondary-emission cathode and a magnetic system on the base of annular permanent magnets was constructed.

THPSC031	The Use of the Electron Beam from the Magnetron Gun-Based Accelerator for Zirconium Surface Modification	electron, cathode, target, vacuum	384
	V. Zakutin, A. N. Aksyonova, A. N. Dovbnya, S. D. Lavrinenko, V. N. Pelykh, N. N. Pilipenko, N. G. Reshetnyak NSC/KIPT, Kharkov
	The paper presents the results of investigations on the zirconium specimen surface after irradiation them with an electron beam from the accelerator. The operating conditions were the following: electron energy from 7 to 80 keV, pulse duration of 15 μs, pulse frequency of 2 Hz. for two modes of the energy density on the samples, namely, 10 J/сm2 and 20 J/сm2. The experiments have demonstrated that the irradiation leads to the noticeable smoothing of the specimen surface roughness, the surface becomes smoother and unruffled. The results of investigations on the microhardness of irradiated and unirradiated areas of the zirconium specimen surface areas show that the microhardness value has been increased by ~20% of the initial value (1920 MPa) for the irradiation energy density of 10 J/cm² and by ~35% for 20 J/cm², that can be related with a different quantity of an transferred energy of the irradiated surface. By choosing the optimum electron irradiation characteristics this technique may be recommended for hardening and modification of the near-surface layer of zirconium materials applied in the nuclear-power engineering.