APAC 2007 - List of Keywords (acceleration)

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

acceleration

Paper	Title	Other Keywords	Page
MOZMA03	Status of FFAG Developments	focusing, synchrotron, resonance, proton	21
	S. Machida STFC/RAL/ASTeC, Chilton, Didcot, Oxon
	Status of FFAG Developments will be talked, which includes nonscaling FFAG for muon acceleration, scaling FFAG for medical and industrial use. The talk focuses on beam dynamics points of view, as well as the on-going project around the world.
	Slides

TUC3MA03	Ultimate Abilities of Conventional Positron Sources	positron, target, electron, linac	97
	P. V. Logachev, M. S. Avilov, M. B. Blinov, P. Martyshkin, T. A. Vsevolozhskaya BINP SB RAS, Novosibirsk
	Significant increasing of desired luminosity for future e⁺e^- colliders leads to corresponding enlargement of positron production rate. Conventional technology of positron production have not reached yet its technical limits. Experimental study in order to find out these limits for basic subsystems of positron source is presented in this paper.
	Slides

TUPMA035	SCSS Prototype Accelerator Timing System	electron, controls, gun, klystron	154
	N. Hosoda, T. Ohata, T. Ohshima JASRI/SPring-8, Hyogo-ken H. Maesaka, Y. Otake RIKEN Spring-8 Harima, Hyogo
	SPring-8 Compact SASE-FEL Source (SCSS) project is in progress. To verify its feasibility, the 250MeV SCSS prototype accelerator (SPA) was constructed and beam commissioning started in October 2005. We observed first lazing of 49nm wave length in June 2006. In this paper, we describe the timing system of SPA. The target time jitter was selected under 1ps. To achieve this, A master trigger generator unit (MTU), a master trigger distribution unit, a 5712MHz synchronous trigger delay unit (TDU) and a level converter unit were newly developed. The MTU generates a 1-120Hz master trigger to drive all accelerator components synchronously from 60Hz AC line and 238MHz RF. The TDU is an 8ch 24bit delay counter to generate required timing signals for each component using the master trigger from the MTU. The TDU uses 238MHz RF as a counter clock and uses 5712MHz RF to recover the circuit jitter and to synchronize to the electron beam. The time jitter of 0.71ps in the TDU was achieved. We measured the time jitter between an electron beam and a 5712MHz RF that is a main acceleration RF frequency, and obtained 0.34ps. This demonstrates good stability of SPA.

TUPMA066	Energy Equalization by using S-band and X-band Accelerator Modules	linac, simulation, positron, klystron	205
	K. Yokoyama, T. Kamitani KEK, Ibaraki
	To reduce the beam loss and to restrict the expanse of the bunch length of the positron beam from the KEKB injector, the energy spread of ±0.25% or less is required for the beam transport line of the KEKB ring. Generally, the positron beam has a large energy spread because the original bunch length is large and all positrons do not see the same accelerating filed. Thus, an energy compression system which consists of six rectangular magnets and two 2-m S-band accelerating structures is implemented at the end of the linac but it has a demerit that the beam bunch is lengthened. We propose a new method to suppress the energy spread without enlarging the bunch length. This method utilizes the superimposed acceleration of the S-band modules and X-band modules.

TUPMA099	Adiabatic Damping of the Bunch-length in the Induction Synchrotron	synchrotron, damping, induction, beam-losses	244
	T. S. Dixit GUAS/AS, Ibaraki Y. Shimosaki, K. Takayama KEK, Ibaraki
	A fact that a bunch-length shrinks with the barrier-bucket acceleration in the induction synchrotron [1], where a single proton-bunch injected from the 500 MeV Booster was accelerated to 6 GeV in the KEK-PS, has been observed [2]. This has been supposed to be simply explained by a term of adiabatic damping. A technique to analytically deal with such an adiabatic dumping in a case of RF bucket acceleration is well-known; a WKB solution is employed for the small amplitude synchrotron oscillation. However, the simple WKB approach is not available for the present barrier-bucket acceleration, because the longitudinal motion always depends on the oscillation amplitude. A novel technique capable of quantitatively predicting the adiabatic phenomenon in the barrier-bucket acceleration has been newly developed. It turns out that the experimental result, numerical simulation, and analytic prediction have been in good agreement with each other. Theoretical approaches tell us that a bunch-length in the barrier-bucket acceleration never continues to shrink but achieves a constant value corresponding to the time duration between barrier voltages. [1] K. Takayama and J. Kishiro, Nucl. Inst. Meth. A451/1, 304-317 (2000)[2] K. Takayama et al., “Experimental Demonstration of the Induction Synchrotron”, published soon.

TUPMA123	Electron Acceleration in the Wake Field Excited by 200TW Femto Second Laser in Underdense Plasma	electron, plasma, laser, scattering	277
	R. Taki GUAS/AS, Ibaraki W. M. An, Hua, J. F. Hua, W.-H. Huang, C.-X. Tang TUB, Beijing S.-I. Kurokawa, K. Nakajima KEK, Ibaraki
	Laser-plasama acceleration experiment has been carried out using 200TW, 30fs Ti:Sapphire laser pulses focused on helium gas-jets with F/8.75 optics. Intense mono-energetic electron beams have been produced by controlling plasma length and density precisely. Energy spectral oscillations in respect to ejection angle have been also observed. Measurements of images from Thomson scattering and fluorescence side scattering from plasma indicate highly relativistic effects such as a long self-channeling, hosing instability and filamentation. It seems that these nonlinear phenomena strongly disturb high energy gain acceleration and high quality beam generation.

WEPMA048	Beam Position Monitor at SCSS Prototype Accelerator	undulator, alignment, dipole, coupling	387
	H. Maesaka, Y. Otake, T. Shintake, K. Togawa RIKEN Spring-8 Harima, Hyogo H. Ego, T. Fukui, N. Hosoda, T. Ohshima JASRI/SPring-8, Hyogo-ken
	The SCSS X-ray free electron laser (XFEL) project is in progress at SPring-8. The SCSS prototype accelerator for VUV-FEL has been constructed and is in operation. The required resolution of the beam position is less than 1um for XFEL (10um for VUV-FEL). A cavity RF-BPM (Radio Frequency Beam Position Monitor) was developed for the SCSS accelerator based on the past experiment in which the position resolution of several 10nm was achieved. In the prototype accelerator, the beam-based calibration method of the RF-BPM was established. An experiment to evaluate the position resolution was also performed, and the preliminary result was obtained to be less than 5um. This result is sufficient for VUV-FEL. The RF-BPM made important contributions to the tuning of the prototype accelerator such as beam optics measurements and VUV-FEL amplification. By using RF-BPM data, for example, the envelope of the beam trajectory was visualized and the beam was straightly passed through undulators. As a result, VUV-FEL amplification was observed in the wavelength region of 40-60nm.

WEPMA075	Improvement of Web-Based Monitoring of EPICS-IOC for PAL Control System	monitoring, controls, linac, site	428
	J. M. Kim, K. M. Ha, H.-S. Kang, J. H. Kim, E.-H. Lee PAL, Pohang, Kyungbuk
	We are now operating a web-based monitoring system of PAL control system with MAC Power PC. In order to expand the IOC’s web-based monitoring system, we are trying to use the X86/Linux platform. With the experience which we got in developing the web-based monitoring of EPICS-IOC based on MAC Power PC, a web-based monitoring system with an X86 Intel PC based on a new concept has been developed for lower costs, easier access and use. Its operating system employs Linux Fedora Cor·10⁴. In order to drive the web-based monitoring system, EPICS Base 3.14.8 and MySQL 4.0 have been installed in the Linux Fedora Core 4. Archive engine with C language and EPICS channel access library are programmed to store the data. As a result of using the web-based monitoring system based on the X86 Intel PC, we have achieved its easier access and use, more convenient maintenance. Performance of the web-based monitoring system with an X86 Intel PC will be discussed.

WEPMA122	Design and Development of 30 MeV, 3 kW RF Electron LINAC	linac, electron, target, coupling	491
	V. T. Nimje, D. Bhattacharjee, K. Dixit, D. Jayaprakash, K. C. Mittal, A. K. Ray BARC, Mumbai
	A 30 MeV, 3 kW RF Electron linac for neutron generation is being designed and developed. The Design parameters, beam studies etc. will be described in this paper.

THXMA03	Construction and Commissioning of the HIRFL-CSR	injection, ion, dipole, accumulation	534
	J. W. Xia, Y. He, Y. Liu, J. C. Yang, X. D. Yang, W.-L. Zhan, Y. yuan IMP, Lanzhou
	CSR is a new ion cooler-storage-ring system in China IMP, it consists of a main ring (CSRm) and an experimental ring (CSRe). The two existing cyclotrons SFC (K=69) and SSC (K=450) of the Heavy Ion Research Facility in Lanzhou (HIRFL) will be used as its injector system. The heavy ion beams from HIRFL will be first injected into CSRm, accompanying with the accumulation, e-cooling and acceleration, finally extracted to CSRe for many internal-target experiments. In 2005 the main construction of the CSR project was finished, and from that the preliminary commissioning of CSRm was started, including the first turn commissioning as a beam line, the stripping injection, and the zero-bumping orbit test, fixed-bumping orbit test with four in-dipole coils, bumping orbit test, C-beam accumulation and the investigation of the closed orbit with BPM. And now the correction of closed orbit, e-cooling and ramping tests are just on going.
	Slides

THZH102	Use of Microbeam at JAEA Takasaki	ion, cyclotron, heavy-ion, radiation	588
	M. Fukuda, K. Hatanaka, T. Yorita RCNP, Osaka T. Kamiya, H. Kashiwagi, S. Kurashima, N. Miyawaki, M. Oikawa, S. Okumura, T. Sakai, T. Satoh, W. Yokota JAEA/ARTC, Takasaki
	The TIARA(Takasaki Ion accelerators for Advanced Radiation Technology) facility of JAEA in Takasaki is equipped with two several-MeV-ion microbeam systems of beam focusing type and one several-hundred-MeV-heavy-ion microbeam system of beam collimating type. The microbeams with a spot size of one micrometer or less in diameter are extensively utilized for the research in materials science and biotechnology. An in-air micro-PIXE analysis system using a few-MeV proton microbeam is quite useful for medical science and dentistry to visualize two-dimensional distribution of very small quantities of elements in a microscopic area like cells with very high sensitivity. A single-ion hit system using a several-hundred-MeV heavy ion microbeam is available for medical and biological applications such as elucidations of cellular radiation response. Highly stable ion beams with energy spread less than 0.02 % are required for production of the microbeams. Improvements of accelerator performance are indispensable to realize the ion beams of high quality. A flattop acceleration system and a magnetic field stabilization system have been developed for the JAEA AVF cyclotron.
	Slides

THC3H103	The Compact Induction Circular Accelerator for Radiation Technologies	induction, electron, betatron, focusing	628
	G. Dolbilov JINR, Dubna, Moscow Region
	The variant of the circular accelerator of electrons with energy up to 10 ?eV is discussed. Acceleration is carried out by an induction electric field on a constant equilibrium orbit of radius about 50 cm. For reduction of reactive power of the accelerator the alternating magnetic fields are concentrated in small volume near to the equilibrium orbit. Use of high-frequency magnetic fields (tens or hundreds ?Hz) allows to increase power of the accelerated electron beam up to some tens kW or hundred kW.

THPMA005	SCSS RF Control Toward 5712 MHz Phase Accuracy of One Degree	controls, klystron, electron, laser	634
	Y. Otake, M. Kitamura, H. Maesaka, T. Shintake RIKEN Spring-8 Harima, Hyogo T. Fukui, N. Hosoda, T. Ohata, T. Ohshima JASRI/SPring-8, Hyogo-ken
	To check the feasibility of X-FEL(SCSS), the 250 MeV prototype accelerator was constructed at SPring-8. The low level RF control system with a 5712 MHz pulsed RF signal was built to achieve very-tight requirements that were phase stability and resolution of less than 1 deg.. These requirements correspond to a beam energy variation of 10^-4 at the crest acceleration and time stability and resolution of less than 500 fs. To realize the requirements, IQ modulators/detectors, arbitrary wave form generators/detectors of VME modules to handle an IQ function were developed. The PID control and the adaptive control method, which the modules can manipulate, were employed to obtain the requirements. We finally achieved the phase setting and detecting resolution of the IQ detectors/modulators of ± 0.5 deg.. Decreasing the phase drift was achieved by the PID control program, and reducing the phase variation within a pulse width of 2 us was achieved by the adaptive control function on the VME modules. The unnecessary time jitters of the pulse were also automatically detected by the module function. In this paper, we describe a summary of the system and its phase control performance.

THPMA064	Development of a 200keV Linear Induction Accelerator	induction, controls, linac, power-supply	720
	K. V. Nagesh, S. Acharya, R. Agarwal, D. P. Chakravarthy, S. Mitra, K. C. Mittal, D. D. Praveen Kumar, R. N. Rajan, S. R. Raul, P. C. Saroj, A. S. Sharma, D. K. Sharma BARC, Mumbai
	Electron Linear Induction Accelerator (LIA) are for applications for applications in High Power Microwaves (HPM), high gradient accelerators, flash X-Ray radiography (FXR), flue gas clean-up, detoxification of chemicals, cross-linking of polymers, sterilization of food and medical devices, etc. The LIA-200 being developed at APPD/BARC consists of three main phases of pulse compression and voltage amplification, viz; (i)solid-state pulse modulator uses semiconductor devices, (ii)Pulse compression and voltage amplification stages, steps up to 200kV, 5 micro-seconds and compresses these pulses to 75kV, 10kA, 50ns in five stage and (iii)three induction cavities in ADDER mode for relativistic electron beam generation, with matched impedance of 5 ohms. Metglas cores have been used in the switches, cavities and pulse transformers. Deminaralized water capacitors and water transmission lines have been used for low impedance energy storage and compactness. The complete system has been assembled and ready for commissioning. LIA system will be operated from a PLC based control system which is under testing.

THPMA102	The Proton and Ion Linear Accelerator ILU-9	ion, proton, cathode, feedback	788
	A. A. Bryazgin, V. Auslender, V. G. Cheskidov, B. L. Faktorovich, E. Konstantinov, A. D. Panfilov BINP SB RAS, Novosibirsk
	The pulse RF ion linear accelerator of ILU-9-type is described. The accelerator is intended to use for various radiation-technological processes and investigations. The main parameters of the accelerator are: energy of accelerated protons 2.9 or 5 (with additional accelerating section) MeV, energy of accelerated deutons 5.8 or 10 MeV, average current of accelerated ions up to 100 μA. Pulse operating mode as following: pulse duration-500 s, maximum pulse repetition- 50 Hz. The frequency of accelerator resonator is 43 MHz. Also data of carbon ions C¹²⁺4 acceleration probability are given.

THPMA115	Present Status of the FFAG Accelerator Complex in KURRI for ADS Study	booster, proton, ion, extraction	803
	M. Tanigaki, M. Inoue, K. Mishima, Y. Mori, S. Shiroya KURRI, Osaka S. Fukumoto, Y. Ishi Mitsubishi Electric Corp, Energy & Public Infrastructure Systems Center, Kobe S. Machida STFC/RAL/ASTeC, Chilton, Didcot, Oxon
	KART (Kumatori Accelerator driven Reactor Test) project has started at Kyoto University Research Reactor Institute (KURRI) from the fiscal year of 2002. The purpose of this project is to demonstrate the basic feasibility of ADS, studying the effect of incident neutron energy on the effective multiplication factor of the subcritical nuclear fuel system. The proton FFAG accelerator complex as a neutron production driver for this project is now in the final stage of the test operation. The first ADS experiment will be held in this autumn by combining this FFAG complex with our Kyoto University Critical Assembly (KUCA) in KURRI. The developments and the current status of this FFAG accelerator complex, including the current status of this project, will be presented.

FRXMA01	Progress of the Laser-Plasma Acceleration Research at KERI	laser, plasma, electron, background	832
	H. Suk, M. S. Hur, J.-U. Kim, S. H.Yoo. Yoo KERI, Changwon J.-H. Jang KAERI, Daejon
	There rise great interest worldwide in plasma accelerators driven by ultra-intense lasers or electron beams which make it possible to generate ultra-high gradient acceleration and high quality particle beams in a much more compact size compared with conventional accelerators. A frontier research on laser and plasma accelerators is focused on high energy electron acceleration and ultra-short coherent X-ray and Tera Hertz radiations as their applications. These achievements will provide not only a wide range of sciences with benefits of a table-top accelerator but also a basic science with a tool of ultrahigh energy accelerators probing an unknown extremely microscopic world. Harnessing the recent advance of ultra-intense ultra-short pulse lasers and accelerators, the worldwide research has made a tremendous breakthrough in demonstrating high-energy high-quality particle beams in a compact scale. This talk highlights recent progress of results on laser and plasma based acceleration experiments to quest for physics of acceleration and beam physics in plasma and to present new outlook for applications of laser and plasma accelerators.

FRYMA02	Towards a Multi TeV Linear Collider; Drive Beam Generation with CTF3	linac, collider, linear-collider, emittance	847
	H.-H. Braun CERN, Geneva
	The 3 TeV compact linear collider, CLIC, foresees an RF source based on a high current drive beam running parallel with the main linac. To generate this drive beam of very high instantaneous power a sophisticated complex consisting of a fully beam-loaded linac and several stages of beam compression is used. Although this scheme is very promising in terms of cost and power efficiency, it needs demonstration in a scaled version before construction of CLIC can be envisaged. This is the aim of the CLIC Test Facility CTF3, build by an international collaboration. CTF3 is constructed and exploited in several phases. Here we report present status, experimental achievements and future plans for CTF3.
	Slides