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MOYMA01 Overview of Energy-Recovery Linacs electron, linac, emittance, laser 11
 
  • R. Hajima
    JAEA/ERL, Ibaraki
  An energy-recovery linac (ERL) is capable of generating an electron beam of high-brightness and high average current. It is, thus, a promising device for future light sources such as next-generation X-ray sources and high-power FELs, and several projects are under way in the world. In this talk, we overview the current status of these projects. Recent studies on beam dynamics issues and development of key components for the ERLs are also presented.  
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MOOPMA05 R&D on Vacuum Components for High-Current Accelerators electron, vacuum, positron, impedance 41
 
  • Y. Suetsugu, H. Hisamatsu, K.-I. Kanazawa, K. Shibata, M. Shirai
    KEK, Ibaraki
  In anticipation of coming high current accelerators era, R&D on various vacuum components has been carried out at KEK. Copper beam ducts with ante-chambers were designed to deal with the intense synchrotron radiation (SR) power density emitted from the high current beam. The ante-chamber structure is also effective to reduce photoelectrons around positron beam, which is helpful to suppress the electron cloud instability (ECI). A comb-type RF-shield was developed to reduce the beam impedance and improve the thermal strength compared to the conventional finger-type one, and applied to bellows chambers and gate valves. The connection flange with the same cross section to the beam duct was also developed in parallel. Novel structure of a movable mask (collimator) was recently proposed, which had lower impedance compared to the conventional one, and now the test model was under fabrication. The beam ducts, the bellows chambers, and the gate valves have been installed in the KEK B-factory (KEKB) positron ring for several years. The performance of these components has been studied during beam operation, and the promising results have been obtained.  
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TUC3H101 Optimization Of The BEPCII Lattice With Frequency Map Analysis resonance, injection, lattice, sextupole 100
 
  • Y. Jiao, S. X. Fang, Q. Qin, Wang, J. Q. Wang, G. Xu, D. M. Zhou
    IHEP Beijing, Beijing
  It is the first time of systemically applying the frequency map analysis (FMA) onto the lattice of BEPCII, which is an e±e? collider. We compute various parameters of the lattice with AT which the FMA code is imbedded in, and compared with that of MAD and SAD codes. The BEPCII colliding and injecting mode lattice are analyzed and optimized with FMA while turning the RF cavity and radiation on. Both on- and off-momentum frequency maps are overviewed. The transverse-longitudinal coupling resonance is found to be able to have large effects on the beam dynamics.  
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TUPMA012 Measurement of Bremsstrahlung Dependent on Stored Beam Current electron, vacuum, storage-ring, ion 115
 
  • Y. Yamamoto
    Ritsumeikan University, Kusatsu-City, Shiga
  Bremsstrahlung was measured as a function of stored beam current using the BGO scintillation spectrometer at the compact superconducting storage ring of Ritsumeikan University. Bremsstrahlung is emitted for collision of stored electrons and residual gas on the beam orbit. Yield of bremsstrahlung depend on stored beam current and residual gas density. We tried to determine gas density on the beam orbit by present measurement.  
 
TUPMA015 Radiation Safety Considerations of the Operation of INDUS-1 Synchrotron Radiation Source photon, shielding, storage-ring, synchrotron 121
 
  • H. Nair, V. Dev, M. K. Nayak, V. Verma, thakkar,k.k. thakkar
    RRCAT, Indore (M. P.)
  • P. K. Sarkar
    DAE/VECC, Calcutta
  • D. N. Sharma
    Bhabha Atomic Research Centre, Trombay, Mumbai
  Radiological safety aspects of the operation of the electron storage ring, Indus-1 (450 MeV, 100 mA) is described in the paper. The ring is provided with a modular hybrid shielding comprising of mild steel and lead through which synchrotron radiation (SR) beam lines pass out. During the commissioning phase several radiation protection problems like streaming of high-energy bremsstrahlung x-rays, through front ends of SR beam lines, shield joints, its detection and containment were encountered. Experimental measurements on the response of conventional radiation monitors with respect to water phantom were then carried out to evaluate the dose build up factors in the streaming high-energy radiation field. The studies lead to the deduction of correction factors for the monitors for use in Indus-1. Improvement in monitor response on account of spectral degradation through shield and radiation levels during accidental beam loss are other problems, which are evaluated. Details of the radiation protection programme, radiation physics studies, the current status of radiation levels and access control are presented.  
 
TUPMA018 Compact Hard X-Ray Synchrotron Radiation Source with Superconducting Bending Magnets storage-ring, synchrotron, booster, synchrotron-radiation 127
 
  • G. Kulipanov, E. Antokhin, A. Gvozdev, P. V. Logachev, N. A. Mezentsev, V. E. Panchenko, A. V. Philipchenko, Y. V. Rakshun, A. V. Utkin, N. Vinokurov, K. Zolotarev
    BINP SB RAS, Novosibirsk
  Synchrotron radiation (SR) with relatively hard spectrum (up to 50 keV) is necessary for realization many modern X-ray analytical methods. These methods can be effectively used in industrial and medical applications, in universities and scientific centers. So, the task of developing of compact source of hard synchrotron radiation is very perspective. Budker INP has a big experience for developing and fabrication of high field superconducting insertion devices for different SR centers. In frame of this activity a superconducting bending magnet with field up to 9.6 T was fabricated for BESSY-II and commissioned in 2004. This magnet also became a prototype for compact hard SR source. A project of such storage ring is under developing in Budker INP now. This design fixed beam energy to 1.2 GeV, ring circumference about 52 m. Estimated horizontal equilibrium emittance will better than 20 nm. This report includes a detailed description of main parameters and magnetic structure of designed storage ring as well as preliminary design of injector system and beamline layout.  
 
TUPMA023 Project of 2 GeV Synchroton Light Source for the Republic of Kazakhstan lattice, synchrotron, emittance, dipole 136
 
  • E. Antokhin, G. Kulipanov, N. A. Mezentsev, V. E. Panchenko, A. V. Philipchenko, A. V. Utkin, K. Zolotarev
    BINP SB RAS, Novosibirsk
  • K. K. Kadyrzhanov, S. N. Lyssukhin
    INP NNC RK, Almaty
  Applications of synchrotron radiation (SR) are very popular for last time in many research fields. Thus a developing of compact source for generation of hard X-ray synchrotron radiation is very actual task. The goal of this work is a developing project of SR source for Republic of Kazakhstan. This storage ring mainly dedicated for performing the high sensitive X-ray fluorescence analysis of different natural samples to be used for ore exploration, ore processing and metallurgy . But implementations of other popular techniques applied for research and education with using synchrotron radiation (XAFS, XRD, etc) are also possible. This report includes a detailed description of main parameters and magnetic structure of designed storage ring as well as preliminary design of injector system.  
 
TUPMA032 Radiation Safety System for INDUS Accelerator Complex controls, monitoring, booster, microtron 148
 
  • R. G. Marathe, V. Bhatnagar, P. Fatnani, R. K. Gupta, G. Singh, D. S. Thakur, thakkar,k.k. thakkar
    RRCAT, Indore (M. P.)
  Indus Accelerator Complex consists of a 450 MeV electron storage ring Indus'1 and 550-2500 MeV booster-cum-storage ring Indus-2, which is under commissioning. A common injector system that feeds these rings consists of a 20 MeV microtron & a 450-600 MeV booster synchrotron. Hazardous ionizing radiation is emitted from the accelerators of a facility like Indus. Therefore, it is mandatory to install a Radiation Safety System (RSS) at such a facility. The essential constituents of such a RSS are:·Shielding structure for protecting the personnel from ionising radiation;·Detection and monitoring of the radiation levels inside & outside the shielded area;·Protection system for ensuring that nobody is inside the shielded area when the facility is in operation. The radiation safety system was set-up in stages. The RSS for microtron and booster synchrotron was set-up first followed by that for Indus-1 ring. For Indus-2, it was commissioned in July 2005. These systems were then integrated and have been performing as intended. This paper presents the integrated radiation safety system of Indus Accelerator Complex with emphasis to important features of Indus-2 RSS.  
 
TUPMA038 Start-up of an FEL Oscillator from Shot Noise electron, simulation, undulator, free-electron-laser 163
 
  • V. Kumar, S. Krishnagopal
    RRCAT, Indore (M. P.)
  • W. M. Fawley
    LBNL, Berkeley, California
  In free-electron laser (FEL) oscillators, as in self-amplified spontaneous emission (SASE) FELs, the build-up of intra-cavity power starts from shot noise resulting from the discreteness of charge in the electron bunch. It is important to do the start-up analysis for the build-up of intracavity power in order to fix the macropulse width from the electron accelerator such that the system reaches saturation. In this paper, we show that one can use the time-dependent oscillator code GINGER [1] to perform this anlysis. we present results of this analysis for the parameters of the Compact Ultrafast TErahertz FEL (CUTE-FEL) [2] being built at RRCAT.

1. W. Fawley, 'A user Manual for GINGER and Its Post-Processor XPLOTGIN}},LBNL-49625-Rev. I' ed., Lawrence Berkley National Laboratory (2004).2. S. Krishnagopal et al., Proceedings of FEL conference (2006) 496.

 
 
TUPMA057 Physics Design of PAL-XFEL Undulator undulator, electron, linac, vacuum 190
 
  • D. E. Kim, C. W. Chung, J.-S. Oh, K.-H. Park
    PAL, Pohang, Kyungbuk
  • I. S. Ko
    POSTECH, Pohang, Kyungbuk
  Pohang Accelerator Laboratory(PAL) is planning a 0.3 nm – 0.45 nm SASE (Self Amplification of Spontaneous Emission) XFEL based on 3.7 GeV linear accelerator. It is targeting utilization of 0.1 nm X-ray radiation using the 3rd harmonic FEL radiation. With 3.7 GeV electron beam energy, achieving 0.3 nm fundamental FEL lazing is very challenging and it requires very low emittance electron beam with minimum energy spread. It also requires small period undulator with very small gap. In this context, application of SPring8 type in vacuum undulator is seriously considered. This reflects the experiences from SPring8 SCSS project. In this report, the physics design efforts of the undulator is described. The periodic parts are optimized to achieve the highest field with other requirements. The end structures were designed to be asymmetric along the beam direction to ensure systematic zero 1st field integral. The thickness of the last magnets were adjusted to minimize the transition distance to the fully developed periodic field. The final design features 4 mm minimum pole gap, 15 mm period, peak effective field of 1.09 Tesla.  
 
TUPMA122 High Power Neutron Converter for Low Energy Proton/Deuteron Beams: Present Status target, proton, vacuum, electron 274
 
  • K. Gubin, A. V. Antoshin, M. S. Avilov, D. Bolkhovityanov, S. Fadeev, N. N. Lebedev, P. V. Logachev, P. Martyshkin, S. Shiyankov
    BINP SB RAS, Novosibirsk
  • L. B. Tecchio
    INFN/LNL, Legnaro, Padova
  In BINP, Russia, the high temperature neutron target for SPES project (INFN-LNL, Italy) is proposed. The target is designed to produce up to 10**14 neutron per second within the energy range of several MeV under irradiation by proton/deuteron beam of power up to 200 kW. By now the target prototype is successfully tested. The development of liquid metal driving system and target general design is started. Presented paper describes the design of the target and the target prototype as well as the results of prototype tests under high-power electron beam. Special attention is paid to the carbon material with high content of 13C isotope. The material is produced following the original technology and used for manufacturing the converter irradiated with the proton beam.  
 
WEZH102 Beam Instrumentation Experience at ATF laser, extraction, emittance, electron 305
 
  • Y. Honda
    KEK, Ibaraki
  Accelerator Test Facility (ATF) at KEK is a test accelerator for linear collider development. It produces a stable low emittance beam that satisfies the requirements in the ILC. Various beam instrumentations (cavity BPM, laser wire, fast feedback, XSR, ODR etc.) have been tested. This presentation will review our recent experiences.  
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WEZMA03 High Power Proton Accelerator in Korea proton, linac, rfq, site 315
 
  • B. H. Choi, S. An, Y.-S. Cho, B. C. Chung, J.-H. Jang, J-Y. Kim, K. Y. Kim, K. R. Kim, H.-J. Kwon, Y. Y. Lee, J. W. Park
    KAERI, Daejon
  A high power proton accelerator project, Proton Engineering Frontier Project (PEFP), as one of the 21C Frontier Projects conducted by Korean Government, has goals to develop a 100MeV high current proton linear accelerator, its beam utilization and industrial applications. As the front end of the 100MeV accelerator, a 20MeV linear accelerator consisted of a 50 keV proton injector, a 3 MeV RFQ, a 20 MeV DTL, was completed and tested. The rest part of the accelerator and various beam lines for beam utilizations are under construction, and also a site preparation and construction works are under progresses in cooperation with Gyeongju city. In parallel proton beam utilization and accelerator application technologies are extensively studied and under development. In this paper the status and the future plan of the project including test results of the 20MeV accelerator, site preparation and construction works, and development of proton beam utilization and user program will be presented in detail.  
 
WEPMA086 First Experiences with Central Web Based Fault Information System controls, synchrotron, synchrotron-radiation, power-supply 446
 
  • B. S. Srivastava, P. Fatnani
    RRCAT, Indore (M. P.)
  Indus Control System operating the Indus-1 and Indus-2 Synchrotron Radiation Sources facilities at RRCAT, Indore is a widely distributed system. It employs, for Indus-1 8 VME Controllers, 300 interface modules, 7 Operator Computers and for Indus-2 approximately 100 Layer-3 VME stations, 10 Layer-2 Supervisory Controllers, 11 Operator Computers and 6 Server Machines. The whole control system is being operated in shifts to provide synchrotron radiation from Indus-1 to users as well as carrying out commissioning experiments of Indus-2. To keep it up and running the faults encountered during its operation are rectified at site and complete observations and rectifications of the faults are recorded electronically by the shift crewmembers in a central web based fault information system. This System is based on three tiers software architecture and has been developed using Java Servlets, HTML, JavaScript and SQL Database. Using relational database, facilities have been provided by the system for logging, e-mailing, acknowledging, exploring and analyzing the faults of various sub systems. This paper briefly describes experience implementations and functionalities provided by the system.  
 
WEPMA135 Mechanical Analysis and Design of the PEFP Low Beta Cavity controls, simulation, superconducting-RF, linac 506
 
  • S. An, Y.-S. Cho, B. H. Choi
    KAERI, Daejon
  Proton Engineering Frontier Project (PEFP) Linac employs the superconducting RF cavity of β=0.42 to accelerate the proton beam with repetition rate of 60 Hz. In order to control the Lorentz force detuning effect, a stiffening structure with double rings and cones is designed for PEFP low beta cavities. This stiffening structure can reduce Lorentz force detuning coefficient to be lower than 1 Hz/(MV/m)2. The cavity’s mechanical modes are calculated by using ANSYS 2-D model and 3-D model. The calculation results demonstrate that PEFP Low Beta Cavity has no dangerous mechanical modes for 60 Hz pulse repetition. The mechanical stability of the SRF cavity is analyzed under the atmosphere pressure after being pumped down and under the helium liquid pressure after being cooled down.

*This work is supported by the 21C Frontier R&D program in the Ministry of Science and Technology of the Korean government.

 
 
THC2MA01 Design of The PEFP Low Beta Cryomodule vacuum, shielding, controls, linac 564
 
  • S. An, Y.-S. Cho, B. H. Choi
    KAERI, Daejon
  A low beta elliptical superconducting RF (SRF) cavity has been designed for the linac of Proton Engineering Frontier Project (PEFP). A double stiffening-ring structure is designed to reduce cyclic Lorentz force detuning of the PEFP low beta cavity. HOM analysis has shown, for the PEFP low beta cavities, the HOM coupler’s Qext needs to be lower than 3·10+5 for reducing influence of the dangerous modes on the beam instabilities and HOM-induced power. A coaxial coupler with two stubs, one hook and the coupling tip directly installed on the inner conductor is designed for PEFP cryomodules. The cooling system including is designed for the PEFP cryomodules. A magnetic shielding structures shaped by two coaxial cylinders is designed for the PEFP low beta cryomodules.

*This work is supported by the 21C Frontier R&D program in the Ministry of Science and Technology of the Korean government.

 
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THZH102 Use of Microbeam at JAEA Takasaki ion, cyclotron, heavy-ion, acceleration 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.  
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THC3MA04 Status of the Novosibirsk High Power Terahertz FEL electron, undulator, laser, vacuum 616
 
  • S. V. Miginsky, B. A. Knyazev, E. I. Kolobanov, V. V. Kotenkov, V. V. Kubarev, G. Kulipanov, A. V. Kuzmin, A. S. Lakhtychkin, A. N. Matveenko, L. E. Medvedev, L. A. Mironenko, A. D. Oreshkov, A. V. Ovchar, V. M. Popik, T. V. Salikova, M. A. Scheglov, S. S. Serednyakov, O. A. Shevchenko, A. N. Skrinsky, N. Vinokurov
    BINP SB RAS, Novosibirsk
  • D. Kayran
    BNL, Upton, Long Island, New York
  The first stage of Novosibirsk high-power free-electron laser (FEL) was commissioned in 2003. It is based on the normal conducting CW energy recovery linac. Now the FEL provides electromagnetic radiation in the wavelength range 120–180 micrometers. The average power is 400 W. The minimum measured line width is 0.3%, which is close to the Fourier-transform limit. The assembly of user beamline is in progress, parts of the full-scale machine are manufactured. The latter will operate in the near IR region and will provide higher average power.  
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THC3MA05 Bunch Compression using the Transport Line and Short Bunch revolving in NewSUBARU linac, injection, storage-ring, electron 619
 
  • S. Suzuki, T. Asaka
    JASRI/SPring-8, Hyogo-ken
  • Y. Hisaoka, T. Matsubara, T. Mitsui, Y. Shoji
    NewSUBARU/SPring-8, Laboratory of Advanced Science and Technology for Industry (LASTI), Hyogo
  We have demonstrated the idea of circulating a short, intense linac bunch for some tens of turns in an isochronous ring. We compressed a bunch from the SPring-8 linac to a few picoseconds rms by means of an energy compression system and a beam transport line from the linac to NewSUBARU. The NewSUBARU storage ring was set to a quasi-isochronous condition and the bunch circulated for some tens of turns after injection while maintaining the short bunch length. And we measured the coherents synchrotron radiation at 90-140GHz by semiconducter detector. The bunch length is maintained in about 20 microseconds, but the CSR power decreases little by little.  
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THPMA022 Design of the Proposed 250 Mev Superconducting Cyclotron Magnet cyclotron, superconducting-magnet, focusing, proton 661
 
  • M. K. Dey, R. K. Bhandari, U. Bhunia, J. Chaudhuri, A. Dutta, A. Dutta Gupta, C. Mallik, S. Murali, J. Pradhan, S. Saha, S. S. Sur
    DAE/VECC, Calcutta
  VECC has proposed a project for the design and development of a 250 MeV superconducting proton cyclotron, which may be used in therapy. In this paper we describe the preliminary design calculations for the superconducting magnet. Hard-edge approximation method has been adopted for finding the poletip geometry to meet the basic focusing requirements of the beam. The uniform-magnetization method has been applied to calculate the 3D magnetic field distribution due to saturated iron poletips, to verify the beam dynamical issues and optimize the poletip geometry. GM type closed cryo-cooler technology is being considered for steady state liquifaction of evapourated He gas from magnet cryostat.  
 
THPMA043 Development of 3 MeV, 30 kW DC Electron Accelerator at EBC, Kharghar electron, controls, vacuum, gun 682
 
  • K. C. Mittal, S. Acharya, R. Agarwal, R. Barnwal, D. P. Chakravarthy, A. S. Chawala, A. R. Chindarkar, S. R. Ghodke, B. S. Israel, A. Jain, D. Jayaprakash, M. K. Kumar, M. K. Kumar, R. L. Mishra, K. V. Nagesh, K. Nanu, M. K. Pandey, G. P. Puthran, R. N. Rajan, S. R. Raul, A. K. Ray, P. C. Saroj, D. K. Sharma, V. Sharma, R. Shilendra, S. K. Suneet, S. B. Supriya, D. P. Suryaprakash
    BARC, Mumbai
  A 3 MeV, 30 kW DC industrial electron accelerator has been designed and is in advanced stage of development at EBC, Kharghar, Navi Mumbai. Electron beam at 5 keV is generated in electron gun with LaB6 cathode and is injected into accelerating column at a vacuum of 10-7 torr. After acceleration, the beam is scanned and taken out in air through a 100 cm X 7 cm titanium window for radiation processing applications. The high voltage accelerating power supply is based on a capacitive coupled parallel fed voltage multiplier scheme operating at 120 kHz. A 50 kW oscillator feeds power to high voltage multiplier column. The electron gun, accelerating column and high voltage multiplier column are housed in accelerator tank filled with SF6 gas insulation at 6 kg/sq.cm. The accelerator is located in a RCC building with product conveyor for handling products. A central computerized control system is adopted for operation of the accelerator. Accelerator is in the advance stage of commissioning. This paper describes the design details and current status of the accelerator and its various subsystems.  
 
THPMA056 Design of the TPS Bending Chamber vacuum, synchrotron, storage-ring, synchrotron-radiation 703
 
  • C. K. Chan, C.-C. Chang, C. L. Chen, G.-Y. Hsiung, S-N. Hsu, H. P. Hsueh, Y.-H. Liu, J. Y. Yang
    NSRRC, Hsinchu
  • J.-R. Chen
    NTHU, Hsinchu
  The article describes the design, manufacture and treatment of the bending vacuum chamber (B-chamber) of the 3GeV Taiwan Photon Source (TPS). The B-chamber is a 5m long aluminum alloy chamber with an antechamber on the near side of the electron-beam duct. The design of B-chamber is aimed to confine the outgassing source and to reduce the power density and photon stimulated desorption (PSD) induced by synchrotron radiation. Besides, the simulations of B-chamber deformation due to evacuation and thermal distribution of the aluminum crotch absorber are also described.  
 
THPMA059 The Vacuum System for the SSRF Storage Ring vacuum, storage-ring, photon, synchrotron 708
 
  • D. K. Jiang
    SINAP, Shanghai
  SSRF is the first third generation light source in China. The storage ring vacuum system adopts SUS316LN material chambers with antechamber structure and discrete absorbers. There are several types of absorbers in the storage ring. TSP and SIP+NEG combined pumps are used. A single finger RF shielded structure is applied in bellows. The models of vacuum chambers (SUS316L material), absorbers and combined pumps (SIP 200l/s + NEG WP1250) were developed and tested. In order to check the vacuum system design and the fabrication technology, the model components were installed together with magnets and girders to forming a standard cell prototype.

Only for poster

 
 
THPMA062 An APPLE-II Type Helical Undulator for SSRF undulator, polarization, electron, synchrotron 714
 
  • Q. G. Zhou, M. Zhang
    SINAP, Shanghai
  Shanghai Synchrotron Radiation Facility (SSRF) is an intermediate energy (3.5GeV) light source under construction. Specially designed insertion devices will be required to realize the high brightness photon beams made possible by the low emittance electron beam. The first insertion device to be designed is a 4.2m long, 10cm period, APPLE-II type helical undulator, U10.0. The U10.0 will use a permanent magnetic configuration corresponding to four standard Halbach-type magnet rows which consist of two pairs of planar permanent magnet rows above and below the electron orbit plane. The C-frame support structure is selected. The design of U10.0, including magnetic structure, backing beams, support structures and drive systems, is described  
 
THPMA073 Artificial Neural Network Calculates Backward Wave Oscillator Parameters Reliably For Pulsed Accelerators simulation, electron, plasma, controls 738
 
  • A. Gokhale
    Terna Collage of Engineering, Navi Mumbai
  • B. P. Dubey
    Bhabha Atomic Research Center, Computer Division, Mumbai
  • A. S. Sharma
    BARC, Mumbai
  A method of quickly and accurately getting the dispersion curves for a slow wave structure filled with plasma is investigated. A universal dispersion equation is derived by utilizing the field theory and expressing the slow wave structure's profile in a finite Fourier series. In principle simulation program takes nearly 6 to 8 hours to generate a single result. A trained Artificial Neural Network, used in this study, calculates the BWO dispersion curve in a fraction of a second accurately and reliably.  
 
THPMA087 Prototype Beam Dump For 10 kW LINAC electron, linac, radioactivity, beam-transport 764
 
  • R. S. Sandha, S. C. Bapna, J. Dwivedi, V. C. Petwal, H. C. Soni
    RRCAT, Indore (M. P.)
  A 10 MeV, 10 kW electron LINAC has been developed at RRCAT, Indore for developing applications in the area of radiation processing of agricultural products and medical sterilization. This paper presents the functional requirements, design and manufacturing aspects of beam dump for this LINAC. Activation, conversion of electron energy into primary bremmstralung and radiation damage are important parameters for material selection of the beam dump. Other important parameters considered are mechanical strength, thermal conductivity, corrosion in ozone environment and manufacturability. Calculations of heat deposition due to electrons & photons, thermal design, hydraulic, structural and engineering design were done. FEM based analysis was performed for calculating temperature rise, deformation and stresses. The maximum temperature is estimated to be about 320 K. A prototype beam dump has been manufactured and installed and it is being tested under actual operating conditions.  
 
THPMA088 Bremsstrahlung Converter For High Power EB Radiation Processing Facility electron, target, photon, radioactivity 767
 
  • V. C. Petwal, S. C. Bapna, S. Kotaiah, R. S. Sandha
    RRCAT, Indore (M. P.)
  • K. V. Subbaiah
    Safety Research Institute, Indira Gandhi Center for Atomic Research, Tamilnadu
  A radiation processing facility based on 10 kW Linac is being set up at RRCAT for irradiation of food products and sterilization of medical items. The facility is planned to operate in electron (10 MeV) and X-ray (5 & 7.5 MeV)mode. The required X-rays will be generated by bombarding an optimised target with 5 or 7.5 MeV electron beam. Monte Carlo simulation with MCNP has been performed to optimise the design of the targets for maximizing the X-ray output. The composite target is made of Ta, water & SS. Characteristics of the emerging X-ray field e.g. photon energy spectrum, angular distribution, radial dose and depth dose distribution in unit density material have been simulated & compared for 5 & 7.5 MeV. Our simulation results show that for optimised design, the fraction of the energy transmitted at 5 & 7.5 MeV is 9.3% & 14.2 % respectively, which is useful for radiation processing. The most probable energy of the photons is 0.3 MeV for both 5 and 7.5 MeV electrons and the average energy is 0.84 MeV & 1.24 MeV respectively. Large fraction of electron beam power is dissipated as heat in the targets. Necessary data has been generated to carry out thermal design.  
 
THPMA096 Installation and Integration of Indus-2 dipole, vacuum, synchrotron, multipole 782
 
  • S. Chouksey, S. Kotaiah, S. S. Prabhu, V. Prasad, R. Ramasubramanian, S. K. Shukla, D. P. Yadav
    RRCAT, Indore (M. P.)
  The Synchrotron Radiation Sources consist of a large number of components of varying nature. Some components are light but highly delicate whereas some are big and heavy. However all components need a careful handling during their installation. Unit-cell mock-up assembly and virtual simulation of the installation process using software tools contributed significantly in visualizing various handling schemes, checking interferences and defining the assembly sequence. We have recently completed the installation and integration of 2.5 GeV Synchrotron Radiation Source, Indus-2, by adopting a set procedure of installation and pre-defined sequence. This paper presents, an overview of procedures, sequence of assembly, equipments and toolings used for material handling and safety precautions taken during the whole task of installation and assembly.  
 
THPMA118 Electron Accelerator of ELV-type and their Worldwide Application electron, controls, extraction, vacuum 809
 
  • N. K. Kuksanov, S. Fadeev, P. I. Nemytov, R. A. Salimov, M. E. veis
    BINP SB RAS, Novosibirsk
  D. C.ELV accelerators are the most popular Russian accelerators for industrial and research purposes. More than 100 accelerators were deliverd from Germany at west to Japan and Malaya at east. By now the total operation time exceeds 1000 accelerato-years. The design and schematic solutions provide the long term and round-the -clock operation. The specific features of the ELV-accelerators are the simplicity of design, convenience and ease in control and reliability in operation. ELV-type acceleratodrs is covering the energy range from 0.2 to 2.5 MeV with a beam current of up to 500 mA and maximum power of up to 400 kW. The accumulated experience in the design, development, and manufacturing of the ELV-series accelerators enables us to propose the machines which by their parameters do not rank below but in the majority of cases even surpassing the best world samples of such machines. In the work presented here the parameters of ELV electron accelerators are given and the main systems of the accelerator and a wide set of supplementary devices extending the application range of the accelerator is given. The main industrial applications of ELV accelerators are considered also.  
 
THPMA121 Accelerator Based Applications At BARC-TIFR Pelletron Accelerator Facility proton, ion, heavy-ion, vacuum 812
 
  • P. V. Bhagwat, R. K. Choudhury, J. A. Gore, A. K. Gupta, S. Kailas, N. Mehrotra, j.p. Nair, S. C. Sharma, P. Surendran
    BARC, Mumbai
  • M. B. Kurup
    TIFR, Mumbai
  • V. C. Sahni
    RRCAT, Indore (M. P.)
  The 14 UD Pelletron Accelerator, set up as a collaborative effort between Bhabha Atomic Research Centre and Tata Institute of Fundamental Research, has been operational since it’s inception in 1989. Apart from basic research, various accelerator based programmes including accelerator mass spectrometry, production of track-etch membranes, production of radio isotopes, irradiation damage studies are being pursued. This contribution will describe the details of currently ongoing programmes.  
 
THPMA123 Analysis and Evaluation of Gamma and Neutron Dosimetry from 48 MeV 7Li on Natural Cu and its Dose Simulation with MCNP target, ion, heavy-ion, simulation 815
 
  • R. G. Sonkawade, P. K. Kumar, S. P. Lochab, B. S. Singh
    IUAC, New Delhi
  • R. V. Kolekar
    Bhabha Atomic Research Centre, Mumbai
  Neutron and gamma angular radiation dose was measured from 48MeV, 7Li ion beam incident on natural thick copper target. Experiment is simulated keeping in view the health physics importance for monitoring the radiation environment in the charged particle accelerator. The neutron dose observed in the forward direction is slightly more compared to the lateral direction. Fast neutron dose was observed by using the 1mm polyethylene radiator in front of the CR-39 detectors and the thermal neutrons were observed using the Lithium Borate radiator. Neutron Spectra is observed using the BC501, with the Time of Flight experimental arrangement. The gamma dosimetry is done using the TLD and the active survey meters, gamma energy of the same reaction is also monitored in the same setup with the HPGe-detector. From the observed gamma spectrum, and the PACE calculation, the possible reactions were identified and correlated with the observed spectrum and the dose results. The neutron and gamma angular dose distribution observed will be discussed, as well an attempt is being made to simulate the same with MCNP and PACE simulation codes.