APAC 2007 - List of Keywords (target)

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

target

Paper	Title	Other Keywords	Page
MOXMA02	Commisioning Experience of SNS	linac, injection, beam-losses, beam-transport	6
	M. A. Plum ORNL, Oak Ridge, Tennessee
	The Spallation Neutron Source accelerator complex consists of a 2.5 MeV H^- front-end injector system, a 186 MeV normal-conducting linear accelerator, a 1 GeV superconducting linear accelerator, an accumulator ring and associated beam transport lines. The linac was commissioned in five discrete runs, starting in 2002 and completed in 2005. The accumulator ring and associated beam transport lines were commissioned in two runs in February and April 2006. With the completed commissioning of the SNS accelerator, the facility has begun initial low-power operations. In the course of beam commissioning, most beam performance parameters and beam intensity goals have been achieved at low duty factor. A number of beam dynamics measurements have been performed, including emittance evolution, transverse coupling in the ring, beam instability thresholds, and beam distributions on the target. The commissioning results, achieved beam performance and initial operating experience of the SNS linac will be presented.
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TUXMA02	Record Luminosities at the Tevatron & Future Potentiality	collider, luminosity, proton, antiproton	51
	S. J. Werkema Fermilab, Batavia, Illinois
	Fermilab Collider Run II has been in progress for nearly six years. During this tine the D0 and CDF experiments have each acquired total integrated luminosities of nearly 2.2 fb-1. Also during this time the peak instantaneous luminosities increased by more than a factor of 25 ' from 10 to as high as 270 ×10³⁰ cm^-2 s-1. An aggressive collider upgrade program continues to make significant progress in conjunction with luminosity production operations. This paper will give the status of Tevatron operations and expectations for the remainder of Run II.
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TUZMA02	Operation for LHC Cryomagnet Tests: Concerns, Challenges & Successful Collaboration	cryogenics, dipole, superconducting-magnet, controls	84
	V. Chohan CERN, Geneva
	The LHC construction phase is coming to a close with installation work progressing rapidly and beam start-up foreseen by end 2007. For the testing of the 1706 LHC cryo-magnets in cryogenic conditions and its successful completion by early 2007,considerable challenges had to be overcome since 2002 to assure certain semi-routine tests operation at CERN. In particular, the majority of staff for tests and measurement purposes was provided by India on a rotating,one-year-stay basis, as part of the CERN-India Collaboration for LHC. This was complemented by some CERN accelerator Operation staff. While only 95 dipoles were tested till 2003, the efforts and innovative ideas coming from the operation team contributed significantly to the completion of tests of nearly all 1706 magnets by end-2006. Amongst these, certain pivotal ideas to stream-line the tests methodology as proposed and implemented successfully by the Indian Associates deserve a special mention. An insight into this as well an overall view of the tests operation will be given, together with an indication of some of the operation-related results from the tests programme.
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TUC3MA03	Ultimate Abilities of Conventional Positron Sources	positron, electron, linac, acceleration	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.
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TUPMA076	Design and Development of Beam Transport Elements for the BARC-ECIL Linac	linac, gun, electron, focusing	220
	P. Roychowdhury, D. P. Chakravarthy, P. Jain, K. C. Mittal, A. K. Ray BARC, Mumbai
	A 10 MeV, 2 kW RF electron linac is under development for cargo scanning. It consists of electron gun, RF linac structure, solenoid focusing magnets, steering magnet, beam diagnostics and x-ray target. The beam diameter requirement at the target is 2mm. Since the beam is to be focused to a diameter of 2mm at the target; the transverse beam optics of the whole linac structure from gun end to the target has been simulated by solving the beam envelope equation. The beam envelope equation has been solved in radial direction by Runga-Kutta method consisting of external focusing field, RF fields, beam perveance and emittance. Various combinations of solenoid magnet focusing have been studied. It has been found that three solenoid magnets are required to focus the beam to a diameter of 2mm at the target, two between the electron gun and the linac entrance and the other between the linac exit and the target. Based on these studies two solenoid magnets has been designed and fabricated. Details of beam optics simulation results and the design of the solenoid magnets will be presented.

TUPMA108	Benchmarking of Multiparticle Phase Scan and Acceptance Scan Techniques for the SNS DTL	linac, simulation, beam-losses, space-charge	253
	D.-O. Jeon ORNL, Oak Ridge, Tennessee
	For a high intensity linac such as SNS Drift Tube Linac, it matters to accurately determine the rf set-point of the tank rf field to minimize beam mismatch and potential beam loss. Two techniques were benchmarked which are multiparticle phase scan and acceptance scan techniques. Excellent agreement was obtained between the set-points obtained from the two techniques. The analysis of both techniques are based on multiparticle tracking using the Parmila code. *SNS is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U. S. Department of Energy.

TUPMA119	Beam Line Design for PEFP User Facility	proton, linac, vacuum, optics	271
	Y.-S. Cho, B. H. Choi, B. C. Chung, K. Y. Kim, K. R. Kim, Y.-H. Kim, Y. Y. Lee KAERI, Daejon
	In the Proton Engineering Frontier Project (PEFP), 20MeV and 100MeV proton beams from a 100MeV proton liner accelerator will be supplied to users for beam applications. The basic lattice for beam transport line will be FODO from the linac to the targets. Dipole magnets exited with shaped AC currents will distribute the beam from the linac to five targets simultaneously. To provide flexibilities of irradiation conditions for users from many application fields, we design beam lines to the targets with wide or focused, external or in-vacuum, and horizontal or vertical beams. The details of the beam line design will be reported.

TUPMA122	High Power Neutron Converter for Low Energy Proton/Deuteron Beams: Present Status	proton, vacuum, radiation, 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.

WEYMA02	India-based Neutrino Observatory - Present Status	simulation, site, electron, controls	290
	V. M. Datar BARC, Mumbai
	The current status of the India based Neutrino Observatory (INO) project is summarized. The two major physics goals are (a) unambiguous demonstration of neutrino oscillation and a more precise measurement of the associated neutrino parameters and (b) to search for matter effects in neutrino oscillation, using the charge identification capability of the magnetized iron calorimeter, which would help determine the signs of one pair of mass differences. The status of the 1 m³ prototype iron calorimetric detector, the design of the 50 kton magnet, the experience with resistive plate chambers used for tracking the charged particles produced in neutrino-iron interactions and the planned electronics and data acquisition system will be presented.
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WEZMA01	Upgrades to the ISIS Spallation Neutron Source	linac, proton, synchrotron, rfq	300
	C. R. Prior STFC/RAL/ASTeC, Chilton, Didcot, Oxon
	With studies of a European Spallation Source (ESS) suspended and high-level discussions taking place over the future of neutrons in Europe, efforts are being made to ensure the sustained success of ISIS well into the foreseeable future. Recent developments include upgrading the injector by replacing the Cockcroft Walton with an RFQ, and installation of a new dual harmonic RF system that should eventually enable up to 50% more protons to be accelerated in the ring. A programme of ion source development also aims at improved reliability, enhanced beam current and longer life-time. This promise of more beam power has led to construction of a second target station providing users with additional experimental facilities starting in October 2008. In the longer term, ideas are forming either for a new high intensity proton driver or for a phased development of ISIS to the 5MW level. As an alternative to generating neutrons, such a machine might also be part of a neutrino factory, a complex of accelerators generating neutrinos from muon decay. This paper describes these activities and identifies their relative importance on an international development scale.
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WEZMA02	China Spallation Neutron Source Design	linac, injection, proton, dipole	310
	J. Wei BNL, Upton, Long Island, New York S. X. Fang, S. Fu, H. F. Ouyang, Q. Qin, H. Qu, J. Tang, S. Wang, X. Xu IHEP Beijing, Beijing J. Feng, Q. W. Yan, J. Zhang, Z. Zhang IPHY, Beijing F. W. Wang Institute of Physics, Chinese Academy of Sciences, Beijing
	The China Spallation Neutron Source (CSNS) is a newly approved project to be constructed in Guangdong, China. The accelerator complex consists of an H^- linear accelerator and a rapid cycling synchrotron accelerating the beam to 1.6 GeV at 25 Hz repetition rate. The primary challenge is to build a robust and reliable user’s facility with upgrade potential at a fraction of “world standard” cost. During the past years, major iterations were made on the design of CSNS accelerator systems. This paper summarizes the machine design and discusses rationale of design revisions.
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WEZMA05	Status and Plans for the TRIUMF ISAC Facility	ion, ion-source, cyclotron, linac	325
	P. Schmor TRIUMF, Vancouver
	The ISAC facility at TRIUMF uses the ISOL technique to create exotic isotopes in a thick target mainly through spallation from 500 MeV protons. The ISAC target area has operated for isotope production with up to 50 kW of beam power from the TRIUMF 500 MeV cyclotron. An ion beam formed from these exotic isotopes is transported at energies either to a linac for further acceleration or to any one of a suite of low energy experimental stations. For accelerating the isotopes an RFQ is followed by a five-tank drift tube linac that provides variable-energy accelerated exotic-beams from 0.15 to 1.8 MeV/u, primarily for nuclear astrophysics experiments. Twenty super conducting rf cavities have been recently added to the linac chain and commissioned with beams of stable isotopes, to increase in the maximum energy of the exotic beams to 4.3 MeV/u. Another 20 cavities will be added in 2009 to bring the energy to 6.5 MeV/u. A second proton beam line from the cyclotron and new target station for target and ion source development have been proposed for ISAC. In the future this new target station could be used as an independent simultaneous source of exotic beams for the experimental program.
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WEPMA038	A Study on the Applicability of Landau Cavity to the 1.2 GeV Booster Synchrotron at Tohoku University	synchrotron, impedance, injection, booster	375
	F. Hinode, K. Akiyama, K. Kasamsook, M. Kawai, A. Kurihara, T. Muto, K. Nanbu, Y. Shibasaki, S. Takahashi, T. Tanaka, M. Yasuda Tohoku University, School of Scinece, Sendai
	In these years, a 1.2 GeV Stretcher-Booster (STB) ring at Laboratory of Nuclear Science, Tohoku University, has been mainly operated in the booster-storage mode in which the high energy gamma-ray beam generated via bremsstrahlung from internal target wire has been utilized for experiments of nuclear physics. Beam energy injected from linac is not high enough (150 or 200 MeV), so that radiation damping time is much long. Although the injector linac provides sufficient beam current without beam stacking, circulating beam current decays rapidly due to instabilities before the beam reaches the top energy. One of the main causes in the beam current limitation is supposed to be strong coupled bunch instability due to the cavity HOM. In order to suppress the instability, applicability of a third-harmonic Landau cavity has been studied for the STB. The 1.5 GHz Landau cavity was already manufactured and installed in the ring. Beam commissioning will be started soon. We are also planning to introduce a longitudinal feedback into the STB. We will report the present status of the STB in this conference.

WEPMA109	Positron Injector Accelerator and RF System for the ILC	positron, electron, photon, linac	473
	J. W. Wang, C. Adolphsen, V. Bharadwaj, G. B. Bowden, E. N. Jongewaard, Z. Li, R. H. Miller, J. Sheppard SLAC, Menlo Park, California
	Due to the extremely high energy deposition from positrons, electrons, photons and neutrons behind the positron target, and because a solenoid is required to focus the large emittance positron beam, the 1.3 GHz pre-accelerator has to use normal conducting structures up to energy of 400 MeV. There are many challenges in the design of the normal-conducting portion of the ILC positron injector system such as obtaining high positron yield with required emittance, achieving adequate cooling with the high RF and particle loss heating, and sustaining high accelerator gradients during millisecond-long pulses in a strong magnetic field. Considering issues of feasibility, reliability and cost savings for the ILC, the proposed design for the positron injector contains both standing-wave (SW) and traveling-wave (TW) L-band accelerator structures. A short version of the new type of the SW section is under fabrication and testing, an updated status report is given. This paper also covers the acceleration vs. deceleration for pre accelerator sections, SW vs. TW structures, as well as the longitudinal matching from target to linac and linac to damping ring. * Work supported by U. S. Department of Energy, contract DE-AC02-76SF00515.

WEPMA122	Design and Development of 30 MeV, 3 kW RF Electron LINAC	linac, electron, coupling, acceleration	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.

THZH103	The Progress of Accelerator Mass Spectrometry and their Applications in China	site, ion, controls, injection	597
	J.-E. Chen, Z. Y. Guo, K. X. Liu PKU/IHIP, Beijing
	The AMS technology and their applications have been developed at Peking University, China Institute of Atomic Energy and Chinese Academy of Sciences since 1980s’. In this presentation, the AMS facilities in China are described and the applications mainly in the field of archaeology are presented. Interesting results about the establishment of Chronology frame of Xia-Shang-Zhou dynasties based on cultural remains at Longshan, Er-li-tou. Xinzha and Tianma-Qucun Site etc. are given as examples. More then one hundred samples of oracle bone were studied for archaeological radio-carbon dating with the AMS facility at Peking University. AMS applications in the fields of geosciences, environmental and biomedical sciences are introduced as well.
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THPMA045	Analysis and Design of Parallel Resonant Network Power Supply for a Rapid Cycling Synchrotron	synchrotron, power-supply, proton, quadrupole	685
	S. R. Tiwari, M. Borage, K. Swarna RRCAT, Indore (M. P.)
	Rapid Cycling Synchrotron (RCS) requires dc biased sinusoidal excitation for electromagnets. Power supplies based on resonant schemes are best suited for such applications, as only the losses of the resonant network are drawn from the mains and the magnets are energized by resonating its inductance with external energy storage elements. In this paper study of various options for powering the magnets and its excitation source is carried out. Optimization of network elements for parallel resonant network with respect to the operating and investment cost is carried out. Tolerance analysis of a high-Q resonant network with respect to variation in component values and its effect on amplitude and phase of magnet current, and the ac component reflected in the magnet current due to presence of ac and dc input source ripple is documented in detail. Design of a parallel , continuous ac excited resonant network for the QF2 magnet for the proposed 1 GeV Rapid Cycling Synchrotron is presented.

THPMA081	Precise Positioning of Magnetic Field Centers of Quadrupole Magnets on the Girder	quadrupole, laser, alignment, synchrotron	749
	L. Tsai, T.-C. Fan, S. Y. Perng, D.-J. Wang NSRRC, Hsinchu
	Conventional alignment of quadrupole magnet on the girder is mainly based on the measurement of theodolite and fiducial. Most of the measurement errors come from human-eye resolution and fiducial precision. The resultant cumulative error could be in the order of 50~100μm. In this paper, pulsed wire method is proposed to align group of quadrupole magnets concentrically on one girder to precision about 10μm. In order to increase the alignment accuracy, sag problem in tension wire is replaced by a short wire with laser PSD system. Descriptions of the setup and test results are presented. quadrupole magnet alignmentpsd

THPMA083	The Magnet Alignment Method For The J-PARC Main Ring	alignment, site, quadrupole, sextupole	752
	M. J. Shirakata, K. Ishii, K. Niki, K. O. Okamura, T. Oogoe, E. Yanaoka, M. Yoshioka KEK, Ibaraki
	In the J-PARC site, the inflastructure for the whole site measurement is planned for the global alignment of the accelerator components. For the neutrino experiments, the J-PARC main ring must be directed to the SUPER-KAMIOKANDE exactly. The global measurements from the Kamioka site to the J-PARC site is carried out by using GPS system on the gound level. Several measurement holes, in order to tranport the coodinates from the ground level into the accelerator floor level directly, are prepared around the J-PARC accelerator complex. The magnet alignment method for the J-PARC main ring are reported with the present alignment status.

THPMA088	Bremsstrahlung Converter For High Power EB Radiation Processing Facility	electron, photon, radiation, 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.

THPMA110	Status of BINP AMS Facility	ion, tandem-accelerator, ion-source, vacuum	794
	M. Petrichenkov, A. D. Goncharov, V. Klyuev, S. G. Konstantinov, A. Kozhemyakin, A. Kryuchkov, V. V. Parkhomchuk, S. Rastigeev, V. B. Reva BINP SB RAS, Novosibirsk
	The status of first Russian accelerator mass-spectrometer project is described. The scheme of spectrometer includes two types of ion sources (sputter and gaseous ones), low energy beam line with analysers, electrostatic tandem accelerator with accelerating voltage up to 2 MV and magnesium vapours stripper and also includes the high energy beam line with analysers. The results of last experiments are given.

THPMA111	Target Assembly Design and Neutronics Study for Indian Spallation Neutron Source Using NMTC/JAM Code	proton, injection, synchrotron, ion	797
	V. K. Senecha, M. Kawai KEK, Ibaraki
	Target-moderator-reflector assembly (TMRA) design studies for the best neutronics performance of the proposed Indian Spallation Neutron Source(ISNS) have been carried out using high energy particle transport code NMTC/JAM. The issues relevant for TMRA design like selection of target material, effect of target shape and dimensions and placement of moderator, suitable material for reflector its size have been addressed using the code calculations. NMTC/JAM code calculations have shown that the neutron yield per proton for thick Pb target for varying target lengths are in good agreement within the error limit with the results reported by experimental group and matching with the results of JAERI code calculations (JAERI 'Data/code 2001-07). Different geometrical configurations for TMRA were attempted and resulted tally's for track-length, surface crossing, nuclide yield, heat deposition, and time tallies for the neutron have been calculated. It has been observed that wing type structure of moderator position with respect to the target is suitable for optimum neutron yield in the pulsed mode. (1) NMTC/JAM, JAERI code 2001-007, Koji Niita et al.(2001).(2)Development of target for KENS, M. Kawai et al. Procd. 2nd Workshop on Materials Tech. for spallation neutron source,141(2001).

THPMA114	Activities on the Nuclear Data Measurement at the Pohang Neutron Facility Based on Electron Linac	electron, linac, quadrupole, background	800
	G. N. Kim Kyungpook National University, Daegu M.-H. Cho, I. S. Ko, W. Namkung POSTECH, Pohang, Kyungbuk H.-S. Kang, Y. D. Oh PAL, Pohang, Kyungbuk
	We report the present status of the Pohang Neutron Facility which consists of an electron linear accelerator, a water-cooled Ta target, and a 12-m time-of-flight path. We measured the neutron total cross-sections in the neutron energy range from 0.1 eV to few hundreds eV by using the neutron time-of-flight method. A 6LiZnS(Ag) glass scintillator was used as a neutron detector. The neutron flight path from the water-cooled Ta target to the neutron detector was 12.1 m. The background level was determined by using notch-filters of Co, In, Ta, and Cd sheets. In order to reduce the gamma rays from Bremsstrahlung and those from neutron capture, we employed a neutron-gamma separation system based on their different pulse shapes. The present measurements of Ta, Hf, Ag, and Mo samples are in general agreement with the evaluated data in ENDF/B-VI. The resonance parameters were extracted from the transmission data from the SAMMY fitting and compared with the previous ones.

THPMA123	Analysis and Evaluation of Gamma and Neutron Dosimetry from 48 MeV 7Li on Natural Cu and its Dose Simulation with MCNP	radiation, 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.

FRAMA01	The Accelerator Activities of the EUROTRANS Programme	linac, proton, controls, rfq	852
	P. Pierini INFN/LASA, Segrate (MI)
	The objective of the EC Integrated Project EUROTRANS is the design and feasibility assessment of an industrial accelerator driven system prototype dedicated to the transmutation of high level waste from nuclear power plants. A part of the program is dedicated to the further development of the high power proton accelerator needed for both the short term experimental demonstrator systems and the long term large scale industrial realizations. In particular the accelerator program addresses the issues of the qualification of the beam reliability with respect to the spallation target requirements, the development of the beam transport line to the subcritical reactor, and the demonstration of the key prototypical components of the proposed linear accelerator. This communication will present an overview and status of the accelerator activities carried out by the partners of the EUROTRANS project. * On behalf of the Working Package 1.3 (Accelerator) of the EUROTRANS program
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