08 Applications of Accelerators, Technology Transfer and Industrial Relations

U05 Applications, Other

Paper Title Page
MOPEA023 Engaging Schools and the Public with Accelerator Physics 118
 
  • S.L. Sheehy
    JAI, Oxford
 
 

Accelerator physics is often viewed as a difficult subject to communicate to schools and the public. The "Accelerate!" project, initiated in the UK in 2008, engages audiences with accelerator physics through a 45-minute live, interactive demonstration show, using basic physics demonstrations to explain the physics of particle accelerators and what they are used for. Feedback has been overwhelmingly positive from all areas, and demand for the show is very high, with over 3000 students involved in the first year of running. The program is also contributing to the science communication skills of physics graduate students. I discuss how to portray basic accelerator concepts through easy to access demonstrations and initial results of audience evaluation of the show.

 
MOPEA032 Carbon Implantation by Polyatomic Ion Source of Organic Liquids 136
 
  • M. Takeuchi, H. Ryuto, G.H. Takaoka
    Kyoto University, Photonics and Electronics Science and Engineering Center, Kyoto
 
 

In order to establish a shallow implantation of polyatomic carbons, a polyatomic ion source for organic liquids with a high-vapor pressure was developed. Vapor of n-octane was ionized by an electron bombardment, and the ion current of 230 μA was obtained at an extraction voltage of 2 kV. The mass spectra indicated that C3H7 ion was the highest in the ion concentration and some fragmentations of octane molecule took place, which might be caused by the electron bombardment. Depth profile of carbon into single crystalline silicon irradiated with C3H7 or C6H13 at different acceleration voltage was analyzed by X-ray photoelectron spectroscopy. As a result, the implanted depth increased with increase of the acceleration voltage. In addition, the C6H13 was implanted deeper than the C3H7 at the same incident energy per atom even though shallow implantation due to binary collision effect had been expected. The depth profile are also discussed in comparison with computer simulation results.

 
MOPEA047 Design of a Compact, Inexpensive Linac for Use in Self-contained Irradiators 178
 
  • S. Boucher, X.D. Ding, A.Y. Murokh
    RadiaBeam, Marina del Rey
 
 

Self-contained irradiators are used for a number of applications, such as blood irradiation to prevent Graft-Versus-Host-Disease, biomedical and radiation research, and detector calibration. They typically use a sealed Cs-137 source to irradiate an item within a treatment compartment. The US National Research Council has identified as a priority the replacement of such high-activity sources with alternative technologies, in order to prevent them from falling into the hands of terrorists for use in a Radiological Dispersal Device ("dirty bomb"). RadiaBeam Technologies is developing a novel, compact, low-cost linear accelerator "the MicroLinac" for use in self-contained irradiators in order to effectively replace Cs-137 in such devices. A previous version of the MicroLinac, originally developed at SLAC, was designed to produce 1 MeV electron energy and 10 μA of average current. RadiaBeam has redesigned the linac to produce 1.5 MeV and 20 μA current, in order to match the penetration and dose rate of a typical blood irradiator. This paper describes the new design of the MicroLinac and our future development plans.

 
MOPEA048 Highlights of Accelerator Activities in France on behalf of the Accelerator Division of the French Physics Society 181
 
  • J.-L. Revol
    ESRF, Grenoble
  • P. Ausset
    IPN, Orsay
  • M.A. Baylac
    LPSC, Grenoble
  • F. Chautard
    GANIL, Caen
  • B. Cros
    Laboratoire de Physique des Gaz et des Plasmas, Universite Paris-Sud, Orsay
  • J.-C. Denard
    SOLEIL, Gif-sur-Yvette
  • F. Kircher, J.-L. Lemaire
    CEA, Gif-sur-Yvette
  • P. Maccioni
    SDMS, Saint Romans
  • R. Roux
    LAL, Orsay
 
 

The French Physics Society is an association the purpose of which is to promote physics and physicists. In this context, the accelerator physics and associated technology division is in charge of the promotion of accelerator activities in France. This paper presents the missions and actions of the division, highlighting those concerning young scientists. A brief presentation of the laboratories, institutes or facilities who are the main actors in the field will then be given. Significant projects which are underway or planned will be described, including medical applications. The major contribution of France to international projects will then be introduced. Finally the cultural and technical relations between industry and laboratories will be discussed.

 
MOPEA049 Application of Particle Accelerators to High Energy Density Physics Research: The HEDgeHOB Collaboration 184
 
  • N.A. Tahir, T. Stöhlker
    GSI, Darmstadt
  • V.E. Fortov, I. Lomonosov, A. Shutov
    IPCP, Chernogolovka, Moscow region
  • R. Piriz
    Universidad de Castilla-La Mancha, Ciudad Real
  • R. Redmer
    Rostock University, Rostock
 
 

Intense particle beams lead to volumetric heating of solid targets that generates large samples of High Energy Density (HED) matter. Such samples are very suitable to study the thermophysical properties of this important state of matter that spans over numerous fields of basic and applied physics. Facility for Antiprotons and Ion Research (FAIR) at Darmstadt, will generate very powerful bunched beams of the heaviest particles (uranium) that will deposit unprecedented high levels of specific power in the target. Extensive theoretical work has been carried out over the past decade to design HED physics experiments at the FAIR. So far, four different experimental schemes have been proposed. These include, HIHEX (Heavy Ion Heating and Expansion, which is suitable to study equation-of-state properties of HED matter), LAPLAS (Laboratory Planetary Science, which is suitable to generate physical conditions that exist in the interiors of the giant planets), Study of the growth of the Richtmyer-Meshkov instability and finally , the ion beam driven Ramp Compression which is suitable to study material properties like shear modulus and yield strength, under dynamic conditions.

 
MOPEA050 Development of a prototype 15 MeV Electron Linac 187
 
  • T.S. Dixit, S.T. Chavan, R. Krishnan, C.S. Nainwad, S.N. Pethe, K.A. Thakur, T. Tiwari, M.M. Vidwans
    SAMEER, Mumbai
  • A. Deshpande
    Sokendai, Ibaraki
 
 

A successful development of a 6 MeV electron radiotherapy machine at SAMEER, India was reported earlier*. Now a 15 MeV electron linac prototype is designed, developed and tested at our site. We have measured a beam current of 80 mA at the X-ray target attached to the linac. Energy gained by electrons in a cavity chain of about 1.2 m length is measured to be more than 15 MeV using a 6 MW klystron power source. An RF window capable of handling 12kW average power is attached to the linac tube and it is cooled by water. The final linac parameters measured were at par with the designed values. A high voltage modulator and control console for the linac are designed and developed in house. This paper will describe key aspects of the design and development process of the complete system. Also future applications are planned like-dual energy dual mode linac for radiotherapy, cargo scanning system and compact compton X-ray source using this technology is briefed in this paper.


* R.Krishnan et. al. "S band linac tube developmental work in SAMEER", FR5REP083, PAC09, Vancouver, Canada.

 
MOPEA051 Preliminary Design of the AEGIS Test Facility 190
 
  • L. Dassa, D. Cambiaghi
    Università di Brescia, Brescia
  • L. Dassa
    I.N.F.N., Pavia
  • D. Perini
    CERN, Geneva
 
 

The AEGIS experiment is expected to be installed at the CERN Antiproton Decelerator in a very close future, since the main goal of the AEGIS experiment is the measurement of gravity impact on antihydrogen, which will be produced on the purpose. Antihydrogen production implies very challenging environmental conditions: at the heart of the AEGIS facility 50 mK temperature, 10-12 mbar pressure and a 1 T magnetic field are required. Interfacing extreme cryogenics with ultra high vacuum will affect very strongly the design of the whole facility, requiring a very careful mechanical design. This paper presents an overview of the actual design of the AEGIS experimental facility, paying special care to mechanical aspects. Each subsystem of the facility - ranging from the positron source to the recombination region and the measurement region - will be shortly described. The ultra cold region, which is the most critical with respect to the antihydrogen formation, will be dealt in detail. The assembly procedures will be considered too, as they are expected to be critical to make the set-up phase easier, as well as to make possible any future improvement of the facility itself.

 
MOPEA053 A Compact Soft X-ray Source based on Thomson Scattering of Coherent Diffraction Radiation 196
 
  • A.S. Aryshev, S. Araki, M.K. Fukuda, J. Urakawa
    KEK, Ibaraki
  • V. Karataev
    JAI, Egham, Surrey
  • G.A. Naumenko
    INPR, Tomsk
  • A. Potylitsyn, L.G. Sukhikh, D. Verigin
    TPU, Tomsk
  • K. Sakaue
    RISE, Tokyo
 
 

High-brightness and reliable sources in the VUV and the soft X-ray region may be used for numerous applications in such areas as medicine, biology, biochemistry, material science, etc. 4th generation light sources based on X-ray free electron lasers are being built in a few world's leading laboratories. However, those installations are very expensive and the access to wider community is very limited. We propose a new approach to produce the intense beams of X-rays in the range of less than 500 eV based on compact electron accelerator. An ultimate goal of the project is to create a compact soft X-ray source based on Thomson scattering of Coherent Diffraction Radiation (CDR) using a small accelerator machine. CDR is generated when a charged particle moves in the vicinity of an obstacle. The radiation is coherent when its wavelength is comparable to or longer than the bunch length. The CDR waves will be generated in an opened resonator formed by two mirrors. In this report we represent the status of the experiment. The pilot experimental results and general hardware design will be demonstrated.

 
MOPEA055 Development of the Focusing System for a Highly Bright X-ray Generator 199
 
  • T. Sakai, M. Ikeda, S. Ohsawa, T. Sugimura
    KEK, Ibaraki
  • N. Sakabe
    FAIS, Akatsuka, Tsukuba, Ibaraki
 
 

A new type of rotating anticathode X-ray generator has been developed, in which the electron beam irradiates the inner surface of a U-shaped Cu anticathode. A high-flux electron beam is focused on the inner surface of the anticathode by optimizing the geometry of the bending magnet. In order to minimize the sizes of the X-ray source, the electron beam is focused in a short distance by the combined function magnets. A shape on the surface of the bending magnet was determined by simulation. The beam trajectories and bending magnet were optimized by the General Particle Tracer(GPT) and Opera-3D code simulation. The result of simulation clearly shows that the bending magnet gap surface angle parameters are important to the beam focused in a short distance. FWHM sizes of the beam from the simulation were obtained to be 0.45mm(horizontal) and 0.05mm(vertical) of which the anticathode with a beam voltage and current were 120kV and 75mA, respectively. The effective brilliance to be about 500kW/mm2 simulated predict that with the supposition of a two-dimensional Gaussian distribution. In this paper, the optimization of the focusing magnet and the results of the prototype test are reported.

 
MOPEA056 Lifetime Measurement of HBC Stripper Foil using 3.2 MeV Ne+ for RCS of J-PARC 202
 
  • Y. Takeda, Y. Irie, H. Kawakami, M. Oyaizu, I. Sugai, A. Takagi
    KEK, Ibaraki
  • T. Hattori, K.K. Kawasaki
    TIT, Tokyo
 
 

Japan Proton Accelerator Research Complex (J-PARC) requires thick carbon stripper foils (200-500 ug/cm2) to strip electrons from the H- beam supplied by the linac before injection into the Rapid Cyclic Synchrotron. A H- beam of 181MeV energy is injected into the 3 GeV Rapid Cycling Synchrotron (RCS) with a pulse length of 0.5 ms, a repetition rate of 25 Hz, and an average beam current of 200 μA. The H- ions are stripped into protons by a charge stripper foil in the injection section. For this high-energy and high-intensity beam, the conventional carbon stripper foils will be ruptured in a very short time. Thus, long-lived thick carbon stripper foils are needed to this high-power accelerator. For this purpose, we are described R and D of long-lived Hybrid Boron-mixed Carbon foils (HBC-foils) of 100 - 500 μg/cm2 by arc discharge method. The preparation procedure is described and lifetime measurement by using a 3.2MeV Ne+ DC beam of 2-3 μA are reported.

 
MOPEA057 Social Aspects of Japanese High Energy Accelerators 205
 
  • K. Hirata
    GUAS, Kanagawa
  • E. Kikutani, M. Sekimoto
    KEK, Ibaraki
  • Y. Takaiwa
    Tsukuba University of Technology, Kasuga Campus, Tsukuba, Ibaraki
 
 

Japanese research to build accelerators for high energy physics started with Electron Synchrotron at Institute of Nuclear Study, Tokyo (INS). The development was slow in the beginning, in particular before the construction of KEK-PS. After the experience of TRISTAN, KEKB, one of the best colliders in the world, was eventually constructed. We will review the history of high energy accelerators in Japan from physics, technological and particularly social points of view referring to documents at KEK and other archives. This is the first of a series of papers and will outline the over-all view.

 
MOPEA058 Measurement of the Parametric X-rays with the Rocking Curve Method 208
 
  • Y. Hayashi, S.V. Bulanov, T. Homma, M. Kando, K. Kawase, H. Kotaki
    JAEA, Kyoto
 
 

Parametric X-ray generation is one of the ways to obtain a monochromatic X-ray. The X-ray is generated through the interaction between high energy electrons and a crystal. The relationship between an X-ray wavelength and an angle of emission is followed by the Bragg condition. Therefore the monochromatic energy of the X-ray can be varied continuously by rotating the crystal. This tunability of X-ray wavelength is suitable for various applications. Usually a single photon counting method is utilized for measuring of the parametric X-rays. Although this method has an advantage to obtain clear energy spectrum, it takes long time. Here, we have measured 10 keV parametric X-rays with applying a rocking curve method. In this scheme, a large number of parametric X-rays are detected simultaneously. This enables us to find and tune the parametric X-ray quickly. As a result, we could find the sharp peak from this method with the Microtron accelerator (150MeV, 20 - 30 pC) at JAEA and a Si crystal. Since the peak angle is consistent to the Bragg condition for the 10 keV parametric X-ray generation, we think 10 keV photons have been generated through the parametric X-ray mechanism.

 
MOPEA059 Laser Acceleration of Negative Ions by Coulomb Implosion Mechanism 211
 
  • T. Nakamura, S.V. Bulanov, H. Daido, T. Esirkepov, A. Faenov, Y. Fukuda, Y. Hayashi, T.K. Kameshima, M. Kando, T. Pikuz, A.S. Pirozhkov, M. Tampo, A. Yogo
    JAEA/Kansai, Kyoto
 
 

Intense laser pulse is utilized to generate compact sources of electrons, ions, x-rays, neutrons. Recently, high energy negative ions are also observed in experiments using cluster or gas target*. To explain the acceleration of negative ions from laser-generated plasmas, we proposed Coulomb implosion mechanism**. When clusters or underdense plasmas are irradiated by an intense laser pulse, positive ions are accelerated inside the clusters or in the self-focusing channel by the Coulomb explosion. This could lead to the acceleration of negative ions towards target center. The maximum energy of negative ions is typically several times lower than that of positive ions. A theoretical description and corresponding Particle-in-Cell simulations of Coulomb implosion mechanism are presented. We show the evidence of the negative ion acceleration observed in our experiments using high intensity laser pulse and the cluster-gas targets.


* S.Ter-Avetisyan et al., J. Phys. B 37 (2004) 3633.
** T.Nakamura et al., Phys. Plasmas 16 (2009) 113106.

 
MOPEA060 Reconstructions of the Control System for the Charge Exchange System at the 3GeV RCS in J-PARC 214
 
  • M. Kawase, M. Kinsho, O. Takeda, Y. Yamazaki, M. Yoshimoto
    JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken
 
 

The charge exchange device for 3GeV RCS in J-PARC, which require that a broken foil is exchanged for a new foil by remote control and automatically in vacuum. The control system's important task will be to control under the unified management of the vacuum system and foil driving system and to support EPICS. This device consists of the vacuum system using PLC (Programmable Logic Controller) and the foil driving system using MCU (Multi Control Unit). A workstation (WS) was required, and we developed control system which control under the unified management of 2 different type of system. The uniform management control system became complex system. In fact, therefore control system was unfinished system, it did not protect trouble such as the vacuum gate valve closed while transfer rod insert in the ring. Each algorithm of PLC, MCU and WS was reviewed, and the control system that was able to do the unified management was restructured. Each algorithm of PLC, MCU and WS was debugged so that this control system is made remote control using EPICS. We introduce the reconstruction of the control system for the charge exchange system at the RCS in J-PARC.

 
MOPEA061 Status Report on RAPID, 1.7MV Tandem Accelerator System, the University of Tokyo 217
 
  • S. Ito, H. Matsuzaki, Y. Miyairi, A. Morita, N. Nakano, Y. Sunohara
    The University of Tokyo, Tokyo
 
 

RAPID (Rutherford Backscattering Spectroscopic Analyzer with Particle Induced X-ray Emission and Ion Implantation Devices), the University of Tokyo has been dedicated to various scientific and engineering studies in a wide range of fields by the ion beam analysis availability, including RBS, NRA, PIXE and ion implantation. The system consists of a 1.7MV tandem accelerator (Model 4117-HC,provided by HVEE corp., Netherland), two negative ion sources (a Cs sputter solid ion source and duoplasmatron gas ion source) and three beam lines. RAPID was installed in 1994 at Research Center for Nuclear Science and Technology, the University of Tokyo at first and since then it has been used for various research fields using ion beams. As the Center was reorganized to be a department of School of Engineering in 2005, the educational utilization came to be an important mission of RAPID. Besides several application studies with PIXE analysis, environmental analysis (pond sediments and atmospheric SPM (Suspended Particulate Matter) is performed as a student experiment. Recently, a low level ion irradiation system was also developed and applied for the study of CR-39 track detector with proton beam.

 
MOPEA062 Development of Advanced Quantum Radiation Source based on S-band Compact Electron Linac 220
 
  • R. Kuroda, H. Ikeura-Sekiguchi, M. Koike, H. Ogawa, N. Sei, H. Toyokawa, K. Yamada, M.Y. Yasumoto
    AIST, Tsukuba, Ibaraki
 
 

Advanced quantum radiation sources such as a laser Compton scattering X-ray source and a coherent THz radiation source have been developed based on an S-band compact electron linac at AIST in Japan. The laser Compton scattering X-ray source using a TW Ti:Sa laser can generate a hard X-ray pulse which has variable energy of 12 keV - 40 keV with narrow bandwidth by changing electron energy and collision angle for medical and biological applications. The coherent THz radiation source based on the electron linac has been also developed instead of a conventional laser based THz source. The designed THz pulse has high peak power more than 1 kW in frequency range between 0.1 - 2 THz. The THz pulse will be generated with coherent radiation such as synchrotron radiation and transition radiation using an ultra-short electron bunch with bunch length of less than 0.5 ps (rms). The coherent synchrotron radiation in the THz region has been already generated and it will be applied to the THz time domain spectroscopy (TDS). In this work shop, we will report present status of our advanced quantum radiation sources.

 
MOPEA064 Accelerator Mass Spectrometry at the Tsukuba 12 MV Pelletron Tandem Accelerator 223
 
  • K. Sasa, N. Kinoshita, Y. Nagashima, K. Sueki, T. Takahashi, Y. Tosaki
    UTTAC, Tsukuba, Ibaraki
  • K. Bessho, H. Matsumura
    KEK, Ibaraki
  • Y. Matsushi
    University of Tokyo, Research Center for Nuclear Science and Technology, Tokyo
 
 

Accelerator Mass Spectrometry (AMS) is a highly sensitive mass spectrometric method for measuring rare isotopes. The technique is mainly applied in chronology, earth and environmental sciences to date samples using long-lived radioisotopes. With a multi-nuclide AMS system on the 12 MV Pelletron tandem accelerator at the University of Tsukuba (Tsukuba AMS system), we are able to measure environmental levels of long-lived radioisotopes of C-14, Al-26, Cl-36, Ca-41 and I-129 by employing a molecular pilot beam method. The high terminal voltage of 12 MV is an advantage for AMS to detect heavy radioisotopes. The principle of AMS and applications with the Tsukuba AMS system will be reported in this paper.

 
MOPEA065 DPIS for Warm Dense Matter 226
 
  • K. Kondo
    Department of Energy Sciences, Tokyo Institute of Technology, Yokohama
  • K. Horioka
    TIT, Yokohama
  • T. Kanesue
    Kyushu University, Department of Applied Quantum Physics and Nuclear Engineering, Fukuoka
  • M. Okamura
    BNL, Upton, Long Island, New York
 
 

Warm Dense Matter (WDM) is an challenging problem because WDM, which is beyond ideal plasma, is low temperature and high density state with partially degenerate electrons and coupled ions. WDM is a common state of matter in astrophysical objects such as cores of giant planets and white dwarfs. The WDM studies require large energy deposition into a small target volume in a shorter time than the hydrodynamical time and need uniformity across the full thickness of the target. Since moderate energy ion beams (~ 0.3 MeV/amu) can be useful tool for WDM physics*, we propose WDM generation using Direct Plasma Injection Scheme (DPIS). In the DPIS, laser ion source is connected to the Radio Frequency Quadrupole (RFQ) linac directly without the beam transport line. The discussions of DPIS for WDM are presented.


* L. R. Grisham, Physics of Plasmas, 11, 5727 (2004).

 
MOPEA066 Recent Progress of MeV Ultrafast Electron Diffraction at Tsinghua University 229
 
  • R.K. Li, H. Chen, Q. Du, T. Du, Y.-C. Du, Hua, J.F. Hua, W.-H. Huang, X. H. Lu, J. Shi, C.-X. Tang, H. S. Xu, L.X. Yan
    TUB, Beijing
 
 

Recent years have witnessed rapid advances of MeV ultrafast electron diffraction (UED), in which high quality, ultrashort, MeV electron pulses from a photocathode RF gun are employed as probes for ultrafast structural dynamics. We've built a prototype MeV UED system at the Accelerator Laboratory of Tsinghua University, optimized the the electron pulse parameters as well as hardware performances, and achieved high quality single-shot diffraction patterns. Moreover, MeV UED can be operated in a so-called 'continuously time-resolved (CTR)' mode, in which an RF deflecting cavity streaks the electron pulse thus each diffraction pattern constitutes an 'atomic movie'. We report our experimental progress on MeV UED in this paper.

 
MOPEA067 PIC Simulation of the Coaxial Magnetron for Low Energy X-band Linear Accelerators 232
 
  • J.Q. Qiu, H. Chen, C.-X. Tang
    TUB, Beijing
 
 

For the miniaturization of low energy linear accelerators, X-band pulsed magnetron with stable performance of 1.5 MW peak power is needed to be developed. This paper presents the 3D particle-in-cell (PIC) of an X-band coaxial magnetron. A time evolved electron flow exhibits N/2 spokes in the simulations, which confirms the generation of pi-mode. Computer modeling indicates the mode competition in the startup process according to the spectra. By changing the DC voltage, we got the voltage-current characteristics of this magnetron, and comparison with the experiment was also been presented.

 
MOPEA069 Platinum Nano Particle Synthesis by Proton Beam Irradiation 235
 
  • J.-K. Kil, M.H. Jung, K. R. Kim, S.J. Ra
    KAERI, Daejon
 
 

We made an experiment apparatus for the investigation of nano particle synthesis by proton inducing. It is composed of water tank, thin sample case with large area, ultrasonic oscillator, beam entrance window, monitoring camera, etc. Pt nano particles were fabricated. Nano particle characteristics are influenced by the condition of the solution, such as concentrations of H2PtCl6, CP and IPA. The experiment apparatus was designed that Pt nano particles were fabricated fore conditions. For a proton induced synthesis, some parameters, such as beam energy, beam current, flux, total dose, dose rate, etc. are also known as important process variables. To identify the effects of these irradiation parameters, we investigated the properties of nano particles according to the changes of these parameters. The energy was changed in the range of 10 ~ 40 MeV, beam current 1 uA. It could be examined by using an experiment apparatus developed for this purpose.

 
MOPEA070 Development of theTarget System for Large-Area Uniform Irradiation Using 2D Motional Stage 238
 
  • K. R. Kim, M.H. Jung, J.-K. Kil, S.J. Ra
    KAERI, Daejon
 
 

Uniform irradiation is very important for many kinds of experiments of proton beam utilization. In general, scanning magnet have been used for the uniform irradiation of high energy proton beam in the type of wobbler scanning, raster scanning, spiral scanning, etc. In the case of using magnets, it is not easy and needs high cost to install and operate because the magnet size and power become bigger with increase of beam energy accordingly. In this paper, we proposed simpler method and apparatus for uniform irradiation using 2D motional stage. It is composed of two motion systems for X- and Y- direction motion and goniostage. The maximum area is 20cm x 20cm and the incident angle can be controlled from +15 to -15 degree. Maximum sample weight have to be less than 5kg. In this paper, preliminary results for simple wobbler scanning is shown when the proton energy and beam current are about 40MeV and 1~10 nA respectively. The uniform scanning area was checked by using GAF film, MD-55 or HD-810. The stage can be used for the beam alignment and beam profile measurement at any position of beam line.

 
MOPEA071 The Solid Target Control System for the RFT-30 30 MeV Cyclotron in KAERI 241
 
  • I.J. Kim, S.M. Choi, M.G. Hur, S.W. Kim, J.H. Park, S.D. Yang
    KAERI, Daejon
 
 

The solid target of the RFT-30 30 MeV cyclotron in KAERI was designed to produce the metalic radioisotopes, such as Zn-62, Cu-67, Ge-68, Pd-103, and In-111. The target control system should provide high reliability to prevent any kind of failure. Moreover, the operating procedures and maintenance cycle should be optimized and well organized to cover the unexpected situations. In this study, a simulation of the control system for the solid target in KAERI was carried out to confirm the operability of the solid target transport system. The receiving and irradiation stations are connected each other through square tube, and the control software was also checked. The developed solid target control system controls vacuum, cooling, and the whole procedures before, during, and after the irradiation.

 
MOPEA074 Resonant Transition Radiation Induced by an Ultrashort Electron Bunch from Aluminium Foil Stack 244
 
  • W.C. Cheng
    National Chiao Tung University, Hsinchu
  • N.Y. Huang
    NTHU, Hsinchu
  • W.K. Lau
    NSRRC, Hsinchu
 
 

Resonant transition radiation (RTR) driven by a femtosecond electron beam is being studied. An aluminum foil stack with vacuum spacers is used as the radiator. With a 27 MeV electron bunch with pulse duration at ~ 100 fsec incident normally on the aluminum foil stack, high photon yields in hard X-ray regime can be obtained. Characteristics of the radiation such as emission spectrum, spatial distribution are calculated. The dependence of RTR photon yields on beam size and bunch length are also studied.

 
MOPEA075 GEANT4 Validation Studies at the ISIS Muon Facility 247
 
  • A. Bungau, R. Cywinski
    University of Huddersfield, Huddersfield
  • C. Bungau
    Manchester University, Manchester
  • P.J.C. King, J.S. Lord
    STFC/RAL, Chilton, Didcot, Oxon
 
 

GEANT4 provides an extensive set of alternative hadronic models. Simulations of the ISIS muon production using three such models applicable in the energy range of interest are presented in this paper and compared with the experimental data.

 
MOPEA076 Geometry Optimization of the ISIS Muon Target 250
 
  • A. Bungau, R. Cywinski
    University of Huddersfield, Huddersfield
  • C. Bungau
    Manchester University, Manchester
  • P.J.C. King, J.S. Lord
    STFC/RAL, Chilton, Didcot, Oxon
 
 

ISIS is the world's most successful pulsed spallation neutron source that provides beams of neutrons and muons that enable scientists to study the properties of the matter at the atomic level. Restrictions are imposed on the muon target regarding thickness as this will affect the proton transmission to the second neutron target. However, it could be possible to improve the muon production by optimizing the target geometry. Currently the muon target is a 7 mm thick graphite plate oriented at 45 degrees with respect to the proton beam. A set of slabs placed at variable distance is proposed instead of the 7 mm thick graphite target. The performance of the set of slabs is examined in this paper.

 
MOPEA077 Material Studies for the ISIS Muon Target 253
 
  • A. Bungau, R. Cywinski
    University of Huddersfield, Huddersfield
  • C. Bungau
    Manchester University, Manchester
  • P.J.C. King, J.S. Lord
    STFC/RAL, Chilton, Didcot, Oxon
 
 

The ISIS neutron spallation source uses a separate muon target 20 m upstream of the neutron target for MuSR research. Because ISIS is primarily a neutron source, it imposes restrictions upon the muon target, which normally are not present at other muon facilities like PSI or TRIUMF. In particular it is not possible to use thicker targets and higher energy proton drivers because of the loss of neutrons and the increased background at neutron instruments. In this paper we investigate possible material choices for the ISIS muon target for increased muon yield.

 
MOPEA079 Impact of the Energy of the Proton Driver on Muon Production 259
 
  • A. Bungau, R. Cywinski
    University of Huddersfield, Huddersfield
  • C. Bungau
    Manchester University, Manchester
  • P.J.C. King, J.S. Lord
    STFC/RAL, Chilton, Didcot, Oxon
 
 

Simulations studies have been carried out to examine the impact of the energy of the proton driver on muon production. The muon flux is calculated as a function of proton energy over a wide range, which covers the energies at the existing muon and neutron facilities worldwide. The muon and higher energy pion yields are normalised per beam current and accelerator power. The case of a higher energy of the proton driver at the ISIS muon facility is also examined.

 
MOPEA081 A Semi-analytical Algorithm for Modelling Compton Gamma-ray beams 265
 
  • C. Sun, Y.K. Wu
    FEL/Duke University, Durham, North Carolina
 
 

Compton scattering of a laser beam with a relativistic electron beam has been used to generate an intense, highly polarized, and nearly monoenergetic gamma-ray beam at several facilities. The ability of predicting the spatial and spectral distributions of a Compton gamma-ray beam is crucial for the optimization of the operation of a Compton light source as well as for the applications utilizing the Compton beam. Based upon the Lorentz invariant Compton scattering cross section, we have derived an analytical formula to study the Compton scattering process. Using this formula, we have developed an integration code to produce the smooth results for the spatial and spectral distributions of the Compton beam. This code has been characterized at the High Intensity Gamma-ray Source (HIGS) facility at Duke University for varying electron and laser beam parameters as well as different gamma-ray beam collimation conditions.

 
MOPEA082 The ALPHA Project at IU CEEM 268
 
  • S.-Y. Lee, G.W. East, R.W. Ellis, Y.C. Jing, Y. Kim, T.H. Luo, P.D. McChesney, X. Pang, T. Rinckel, P.E. Sokol
    IUCF, Bloomington, Indiana
  • J.E. Doskow
    IUCMB, Bloomington, Indiana
 
 

We are building a low energy electron storage ring that has many desirable properties, such as varying momentum compaction factor, damping partition numbers, favorable betatron tunes for multiturn accumulations, and excellent dynamic aperture. This storage ring can be used for debunching rf linac beams in one turn, for compression of linac pulses, and more importantly for a compact photon source based on inverse Compton scattering of laser beams.

 
MOPEA084 Timestamping for Relativistic Electron Diffraction 271
 
  • C.M. Scoby, M.S. Gutierrez, J.T. Moody, P. Musumeci, M.T. Westfall
    UCLA, Los Angeles, California
 
 

High brightness ultrashort electron beams have been produced at the UCLA Pegasus photoinjector lab for use in time-resolved electron diffraction applications. Beams have been generated with high enough brightness to obtain single shot diffraction patterns of thin solid targets. These beams contain a few pC at 3.5 MeV in a 200 fs pulse. Pump-probe experiments on thin metal foils have already shown promising results on picosecond time scales*. Current research focuses on materials with processes that are observable on the sub-100 fs scale. To overcome rf jitter and synchronization problems, electro-optic sampling is used as a single shot time-of-arrival diagnostic** to help reconstruct the melting "movie."


*P. Musumeci, et al., Rev. Sci. Instrum. 80, 013302 (2009)
**C. Scoby, et al., PR-ST Beams and Accel. 13 (2010)

 
WEIRA06 Status of the Accelerator Industry in North America 2461
 
  • J.E. Clayton
    Varian Medical Systems, Oncology Systems, Palo Alto
 
 

Several projects for synchrotron light source facilities and medical accelerators are proposed in North America. Application of accelerators for homeland security system is also under consideration. Project X is a typical example of a big next generation accelerator project. The current status of the accelerator industry in North America will be presented.

 

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