APAC 2007 - List of Keywords (vacuum)

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vacuum

Paper	Title	Other Keywords	Page
MOOPMA04	Crab Cavity Development	superconductivity, luminosity, dipole, monitoring	36
	Y. Morita, K. Akai, K. Ebihara, T. Furuya, K. Hara, T. Honma, K. Hosoyama, A. Kabe, Y. Kojima, S. Mitsunobu, H. Nakai, K. Nakanishi, M. Ono, Y. Yamamoto KEK, Ibaraki T. Kanekiyo Hitachi Ltd., Hitachi Research Laboratory, Ibaraki-ken K. Okubo, K. Sennyu MHI, Kobe M. M. Rahman University of Chittagong, Chittagong
	Tow superconducting crab cavities, witch will be installed in the KEKB accelerator, is being assembled. The KEKB (KEK B-factory) is a double-ring, asymmetric-energy, high luminosity electron-positron colliding accelerator with a finite angle beam crossing. A purpose of the crab cavities is to deflect the beam-bunch with time-varying RF fields, and to provide the head-on collision at the interaction point (crab crossing scheme). The head-on collision will drastically increase luminosity. The crab cavity is required to have high RF fields (kick voltage) to provide beam-bunch deflection. This mode (crab mode, 509 MHz) is not the lowest order mode (LOM) of the cavity. In order to damp the LOM as well as the HOMs, a coaxial coupler is attached along the beam pipe. Two crab cavities have been fabricated and tested in a vertical cryostat. These cavities have already achieved the required kick voltage. One cavity was recently tested with high RF power in a cryomodule. After some conditioning, this cavity has achieved the required kick voltage. The test revealed some modifications were needed. After improvements, the cavity will be ready for installation.
	Slides

MOOPMA05	R&D on Vacuum Components for High-Current Accelerators	electron, positron, impedance, radiation	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.
	Slides

TUYMA02	Commissioning of the Indus-2 Storage Ring	synchrotron, storage-ring, booster, synchrotron-radiation	61
	V. C. Sahni RRCAT, Indore (M. P.)
	An overview of the 2.5 GeV synchrotron radiation source, Indus-2, which has been set up at RRCAT, Indore will be presented with emphasis on commissioning details. The accelerator is used both as a booster and as a storage ring. Using an injection energy of 550MeV, the beam energy has been ramped up to 2.4 GeV. Two beam lines have also been installed, one for x-ray diffraction (XRD) and another for extended x-ray absorption fine structure (EXAFS) studies. To condition the vacuum chamber of the ring, regular operation has been restricted to 2 GeV. To test the XRD beam line, first diffraction pattern from a pyrolitic graphite sample was recorded with bending magnet synchrotron light with ring operating at 2 GeV. Indigenous technological base created in setting up Indus-2 would be used while participating in up coming international accelerator projects.
	Slides

TUYMA03	Commissioning and Status of the Diamond Storage Ring	feedback, injection, storage-ring, closed-orbit	66
	R. P. Walker Diamond, Oxfordshire
	Diamond is the UK's new 3'rd Generation Synchrotron Light Source. The construction phase has just concluded and the first operation with external users is about to begin. This presentation will concentrate on the second phase of commissioning of the storage ring at the full energy of 3GeV, which began in September 2006, with a full set of 7 Phase I Insertion Devices installed. The current status and future plans will also be described.
	Slides

TUZH102	Ion Instability Issues in Electron Rings	electron, ion, undulator, damping	79
	T.-Y. Lee, J. Choi, H.-S. Kang PAL, Pohang, Kyungbuk
	The fast ion instability (FII) attracts interests recently for the International Linear Collider Project. FII was found by simulation in SLAC and later observed experimentally. Brief introduction and history of FII is given in this talk and a recent observation of FII in the PLS in-vacuum undulator is reported.
	Slides

TUPMA001	New Connection Cryostat to Insert FP420 Proton Tagging Detector in the LHC Ring	proton, cryogenics, alignment, controls	103
	S. M. Pattalwar STFC/DL/ASTeC, Daresbury, Warrington, Cheshire T. Colombet, S. Marque, T. Renaglia, D. K. Swoboda CERN, Geneva B. Cox, K. M. Potter, F. Roncarolo UMAN, Manchester D. Domenico INFN-Torino, Torino
	FP420 is a R&D project to assess the feasibility of installing proton tagging detectors in the region 420m from the interaction points at the LHC. They would function as new sub-detectors at ATLAS/CMS, allowing the measurement of the spatial position and arrival time of outgoing protons emerging almost intact from the collision. Forward proton tagging in this region is expected to open a new programme of electroweak, QCD and BSM physics. At present the 420m region is enclosed in a 'connection cryostat' (maintained at 1.9K) that provides continuity for the LHC beam, cryogenic & vacuum services and electrical power circuits through superconducting bus bars. The requirement of near room temperature operation and critical position control close to the beam pipes has made inserting FP420 detectors in this region a very complex task. The currently favoured design calls for the replacement of the connection cryostats with a new ~12m long assembly that will have all the necessary features of the existing connections cryostat as well as the appropriate environment for the operation of the detectors. This paper mainly describes the cryogenic aspects of the new connection cryostat.

TUPMA012	Measurement of Bremsstrahlung Dependent on Stored Beam Current	electron, storage-ring, radiation, 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.

TUPMA057	Physics Design of PAL-XFEL Undulator	undulator, radiation, electron, linac	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.

TUPMA075	Status of the CTF3 Frequency Multiplication Rings	linac, electron, injection, collider	217
	A. Ghigo, C. Biscari, F. Marcellini, M. Serio, A. Stella INFN/LNF, Frascati (Roma) R. Corsini, S. Doebert, G. Geschonke, L. Rinolfi, F. Tecker, P. Urschütz CERN, Geneva
	The CLIC Test Facility (CTF3) is in construction at CERN by an international collaboration to demonstrate the feasibility of two beam acceleration scheme at the CLIC parameters. The drive beam of the CTF3 is composed by a fully loaded Linac that generates a long bunch train and two rings that provide the high current and bunch frequency multiplication by interleaving bunch trains. The status of the commissioning of the first ring (Delay Loop) and of the transfer lines are reported together with the installation of the second ring (Combiner Ring).

TUPMA085	LEIR: Towards the Nominal Lead Ion Beam	ion, injection, electron, linac	229
	M. Chanel, M.-E. Angoletta, V. Baggiolini, P. Belochitskii, A. Beuret, A. Blas, J. Borburgh, C. Carli, K. Cornelis, T. Fowler, M. Gourber-Pace, S. Hancock, C. E. Hill, M. Hourican, D. Kuchler, E. Mahner, D. Manglunki, S. Maury, M. M. Paoluzzi, S. Pasinelli, J. Pasternak, U. Raich, F. Roncarolo, C. Rossi, J.-P. Royer, M. Royer, R. Scrivens, L. Sermeus, G. Tranquille, M. Vretenar CERN, Geneva
	The Low Energy Ion Ring (LEIR) is a central piece for LHC ion operation at CERN, transforming long Linac3 pulses into high density bunches needed for LHC. The first phase of LEIR commissioning successfully attained its goal of providing the so-called 'early ion beam' (one bunch of 2.25 10⁸ Lead ions) needed for the first LHC ion runs with reduced luminosity. Studies in view of generating the beam needed for nominal ion operation (2 bunches of 4.5 10⁸ ions in LEIR) are being carried out in parallel with the setting-up of the early beam in the accelerators further downstream in the LHC injector chain. The main characteristics of the machine using a new state of the art electron cooler are discussed together with the latest results.

TUPMA088	High Power RF Testing of a Cell Coupled Drift Tube LINAC Prototype for LINAC4	coupling, linac, klystron, pick-up	232
	M. Vretenar, Y. Cuvet, F. Gerigk, J. Marques Balula, M. Pasini CERN, Geneva
	A Cell-Coupled Drift Tube Linac (CCDTL) accelerating structure at 352 MHz has been selected for the energy range 40 to 90 MeV of Linac4, a new injector linac for the CERN accelerator complex. With regard to a conventional DTL in this energy range this structure presents the advantages of lower construction cost and easier access, cooling and alignment of the focusing quadrupoles placed between tanks. A full-scale high-power prototype of about 1/3 of a complete module has been designed and built at CERN. It is fed by a waveguide input coupler of novel conception. This paper summarizes the main mechanical features of the prototype and reports the results of low-power and high-power RF testing.

TUPMA093	Thermo-structural Analysis of 400 KeV Deuteron RFQ Components	rfq, pick-up, linac, beam-transport	235
	P. Jain, R. Kumar, P. K. Nema, P. Singh, V. L.SR. sista BARC, Mumbai
	BARC is developing technologies for a high current low energy proton accelerator, which includes a 3MeV RFQ. As part of this, a 400 KeV prototype deuteron RFQ has been planned. This RFQ will also be utilized later to replace 14 MeV neutron generator at BARC. In this paper we are presenting Thermo-structural analysis of RFQ and features such as RF Coupler, Tuner, Vacuum port etc. This investigation will lead to design of local cooling schemes of these components. Parametric studies are also included in this paper. Feasible Cooling schemes which meet cooling requirements of components will also be discussed. e-mail:piyushj@barc.gov.in

TUPMA102	Installation and Radiation Maintanance Scenario for J-PARC 50 GeV Synchrotron	extraction, septum, beam-losses, synchrotron	247
	M. Yoshioka, T. Fujino, Y. Hori, K. Ishii, H. Kobayashi, T. Kubo, H. Matsumoto, H. Oki, T. Oogoe, Y. Saito, Y. Sato, M. Shimamoto, M. J. Shirakata, Y. Takeuchi, M. Uota, Y. Watanabe KEK, Ibaraki M. HOSOKAWA THK CO., LTD, Hitachinaka Y. Kuniyasu MELCO SC, Tsukuba
	Installation and assembling of accelerator components for J-PARC 50 GeV Synchrotron are now underway. Off-beam commissioning will be carried out between December 2007 and April 2008, and the full commissioning of J-PARC accelerator complex, which is consisted of an injector linac, a 3 GeV rapid cycling synchrotron and the 50 GeV Synchrotron, will be started from May 2008. This paper describes the status, schedule and method of installation and assembling of accelerator components. Radiation maintenance scenario will be also described.

TUPMA119	Beam Line Design for PEFP User Facility	proton, linac, target, 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	target, proton, 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.

WEXMA02	The BEPCII: Construction and Initial Commissioning	linac, cryogenics, luminosity, positron	285
	C. Zhang, Q. Qin IHEP Beijing, Beijing
	As a natural extension of the Beijing Electron-Positron Collider (BEPC), the BEPCII project has started its construction since the beginning of 2004. The BEPCII will operate in beam energy of 1-2.1 GeV, its design luminosity is 110³³cm-²s-¹ at 1.89 GeV with double-ring structure. The upgraded collider will also serve as a synchrotron radiation source with higher beam energy and intensity than the BEPC. Some key technologies, such as superconducting RF system, low impedance vacuum devices, superconducting micro-beta quadrupoles, etc. are developed. The injector linac reached its design specification by the summer of 2006. Most storage ring components have been manufactured, installed and tested. The final checkout of the storage ring subsystems is underway. For the delay of the cryogenic and high current test of the superconducting quadrupoles, the commissioning of the storage rings will be started with normal magnets in the interaction region in autumn of 2006. The project is scheduled to complete in 2008. This paper will present the updated status and preliminary commissioning results of the BEPCII. For the BEPCII team
	Slides

WEPMA024	A General Model of the Resistive Wall Instability in Linear Accelerators	focusing, coupling, single-bunch, linear-collider	363
	J. R. Delayen Jefferson Lab, Newport News, Virginia J. Wu SLAC, Menlo Park, California
	A general model for wakefield-generated instabilities in linear accelerators originally developed for cumulative beam breakup is applied here to the resistive wall instability. The general solution for various bunch charge distributions and application to various accelerator configurations will be presented.

WEPMA089	Control and Instrumentation for the VEC Superconducting Cyclotron Cryogen Delivery System	controls, cyclotron, instrumentation, monitoring	452
	T. Bhattacharyya, R. K. Bhandari, T. D. Das, C. N. Nandi, G. P. Pal DAE/VECC, Calcutta
	The cryogen delivery system for the superconducting cyclotron supplies liquid helium to the superconducting main magnet coil and three cryopanels. It also supplies liquid nitrogen to the thermal shield of the liquid helium chamber housing superconducting coil and the thermal shield and baffles surrounding the cryopanels. A suitable efficient piping network comprising vacuum jacketed cryogenic transfer lines, liquid nitrogen shielded transfer line and distribution manifold is used in the superconducting cyclotron for distribution of cryogens. A liquid helium pump ensures the required flow of liquid helium through the cryopanels. The cryogen delivery system is fitted with necessary field instrumentation and controllers to monitor and automatically control certain important process variables. The control system is a PLC based system which takes care of cool down, steady state, quench protection and warm up mode and generates alarm and interlock signals whenever necessary. The SCADA communicates with the PLC through dedicated control LAN and enables the operator to monitor, control and data log. This paper reports the overall control and instrumentation for the cryogen delivery system.

WEPMA096	Rejuvenation of Linac Control System for TLS	controls, linac, booster, gun	458
	C. Y. Wu, J. Chen, K. T. Hsu, S. Y. Hsu, K. H. Hu, J.-Y. Hwang, C. H. Kuo, D. Lee, K.-K. Lin, C.-J. Wang NSRRC, Hsinchu
	The pre-injector control system is a turn-key system, which was deployed 15 years ago. It is complicated and out-of-date nowadays in terms of system integration and hardware upgrading. It must be modernized to ensure its performance and reliability, and most importantly, to facilitate system maintenance. Modernization involves upgrading to enhance functionality, to prevent obsolesce of out-of-date control modules, and to replace old parts. The purpose of the upgrade plan is to replace the pre-injector control system by a new unit which has the same control environment as that of the main control system of the NSRRC accelerator facilities. Thus, the control system maintenance, as a whole, will be made substantially easier than the original system.

WEPMA105	High Power Test of C-band Accelerating System for Japanese XFEL Project	klystron, linac, power-supply, collider	470
	K. Shirasawa, T. Inagaki, H. Kitamura, T. Shintake RIKEN Spring-8 Harima, Hyogo H. Baba, H. Matsumoto KEK, Ibaraki S. Miura MHI, Hiroshima
	?The C-band (5712 MHz) choke-mode type accelerating structure will be used for SCSS: SPring-8 Compact SASE Source project. Since the C-band accelerator generates higher accelerating gradient than traditional S-band accelerator, it makes the machine size compact and the cost low. In order to confirm the performance of the C-band accelerating system for the 8 GeV XFEL machine, the system including the same accelerating structure and RF system have been installed in the SCSS prototype accelerator. The first SASE amplification was observed at 49 nm on June 2006. In the prototype machine, four 1.8 m long C-band accelerating structures are used to accelerate electron up to 250 MeV. The C-band accelerator?unit has one 50 MW klystron and pulse compressor, where two types of pulse compressors: SKIP and SLED were adapted. After 300-hour RF conditioning, accelerating gradient up to 32 MV/m was achieved and we confirmed there is no serious problem. Now we continue the RF conditioning to get higher accelerating gradient and find the practical limit. In this paper, we would like to report on the RF conditioning and the achieved performance of the C-band accelerator.

WEPMA111	Mechanical Engineering Challenges in the Development of the FEL at RRCAT	undulator, linac, gun, laser	479
	S. Chouksey, S. Krishnagopal, V. Kumar, S. Lal, K. K. Pant, V. Prasad RRCAT, Indore (M. P.)
	The Compact Ultrafast TErahertz Free-Electron Laser (CUTE-FEL) is being developed by BP&FEL Laboratory, RRCAT, which is designed to lase around 80 mm. Sub-systems like S-band high gradient accelerating structures, pre-buncher, buncher, pure permanent undulator etc. have already been developed and others are in advanced stage of fabrication/commissioning. In this paper we present the design, fabrication, measurements and status of various prototype developments of structures.

WEPMA112	Thermal Simulations of a Photocathode R. F. Gun	gun, simulation, laser, electron	482
	B. Biswas, S. Krishnagopal, A. Kumar, S. Lal, K. K. Pant RRCAT, Indore (M. P.)
	We are developing a photocathode linac, which uses a 2856 MHz r.f. gun, with a copper cathode driven by a 10² MHz, 266 nm laser at inclined incidence. The laser photocathode r.f. gun is a 1.6 cell BNL/SLAC/UCLA type III r.f. gun. In this paper we present the dynamic thermal cooling simulations to calculate the structural deformations and consequent frequency drift of the gun. We have done a complete r.f.-thermal-structural-r.f finite-element analysis (FEA) of the gun in that order, using ANSYS/MULTIPHYSICS. We find that with the present coolant channel design the gun can operate at up to 2 Hz without any significant change in resonant frequency and field balance.

WEPMA123	Comparative Analysis of Blade Tuner Optimization Options for the ILC	simulation, superconducting-RF, electron	494
	C. Pagani, N. Panzeri INFN/LASA, Segrate (MI)
	Following the successful experience of the blade tuner concept for superconducting cavities, a full parametric analysis has been performed for ILC cost optimization. Different design details have been reconsidered and optimized on the basis of their impact on the ILC requirements and on production costs. Two different designs have been then developed for two options of fabrication material: titanium or stainless steel. The realization of two prototypes, one for each type, has been recently launched for the designs qualification and comparison. In this paper we discuss the optimization rationales and the expected differences in cost and tuner integration and performances. Cold tests on cavities will be at the basis of the final choice for the ILC.

WEPMA137	Design and Simulation of Multibeam Klystron Cavity	klystron, simulation, coupling, linac	509
	A. K. Tiwari, R. K. Arora, P. R. Hannurkar RRCAT, Indore (M. P.)
	The klystron amplifier is capable of providing maximum power per unit length. A number of klystrons may be paralleled to get more power output and increased redundancy but phase matching at output remains a troublesome part of any such arrangement. Multibeam klystron provides a solution where all the beams are accelerated through a common voltage and interaction takes place in a common structure namely multibeam cavity so the problem of phase matching no longer exists. The advantage of MBK is low perveance for individual beams and hence higher efficiency. The design and simulation of a multibeam klystron cavity with four beams is presented using electromagnetic code Microwave Studio. R/Q at frequency 350MHz is optimized. The cavity simulated is to be used in 350 MHz, 250 kW CW klystron. This klystron will be used for 100 MeV proton Linac for Spallation Neutron source (SNS). Important Simulation results are described.

WEPMA139	Development of High-power Microwave Devices in Toshiba	klystron, electron, cathode, linac	511
	K. Hayashi, M. Irikura, Y. Okubo, H. Urakata TETD, Otawara M. Y. Miyake Toshiba, Yokohama
	Vacuum microwave devices continue to be essential for high-power RF accelerator systems and plasma heating or current drive systems for fusion experimental devices. Klystrons are suitable for use in amplification at the frequency ranges from 300 MHz to X band, while gyrotrons are mainly utilized in the millimeter wave range. Input couplers also play an important role in the building of acceleration cavity systems. TETD (Toshiba Electron Tubes & Devices Co., LTD.) has been developing these vacuum microwave devices in collaboration with some Japanese research institutes. Two kinds of long-pulse klystron for the J-PARC project were developed in collaboration with KEK and JAEA, which each have their operation frequencies, 324 MHz and 972 MHz. Both tubes output 3 MW with the pulse duration of 0.62 ms at the repetition frequency of 50 pps. They have a triode-type electron gun and same beam parameters and operate with an anode-modulating mode to reduce the cost of the power supply system.

WEPMA142	Commissioning and Operational Experience with INDUS-2 RF Systems	injection, controls, klystron, power-supply	517
	M. Lad, M. K. Badapanda, A. Bohrey, P. R. Hannurkar, A. Jain, M. K. Jain, N. Kumar, M. Prasad, V. Rajput, D. Sharma, N. Tiwari, R. K. Tyagi, R. K.DEO. deo RRCAT, Indore (M. P.)
	2.5 GeV, 300mA Synchrotron Radiation Source Indus-2 is under commissioning phase at RRCAT, Indore. The beam injection in Indus 2 from Booster Synchrotron started in July 2005,since then RF system is in operation. RF system compensates the SR losses experienced by the circulating electrons in the bending magnets and insertion devices. In addition to compensate Synchrotron losses, RF system will have to supply power for boosting energy from 600 MeV to 2.5 GeV. Indus-2 RF system employs four numbers of ELETTRA make elliptical cavities to generate 1500 kV accelerating RF voltage at 505.812 MHz. Each RF cavity is powered by 64 kW RF amplifier. With around 650 KeV of SR losses the system is designed to provide cavity gap voltage such that sufficiently high quantum and Touschek lifetime is achieved. Initially conditioning of all four RF cavities was performed. Then system was handed over for operation and with beam trials optimization of different parameters of RF system is being done. The paper describes test results of Indus-2 RF system & commissioning and operational experience of Indus-2 RF system.

THYMA03	Commissioning Experience of Superconducting Radio Frequency Systems for the Taiwan Light Source	cryogenics, synchrotron, feedback, photon	549
	Ch. Wang, L.-H. Chang, M. H. Chang, S.-S. Chang, F.-T. Chung, F. Z. Hsiao, M.-C. Lin, Y.-H. Lin, M. H. Tsai, T.-T. Yang, M.-S. Yeh NSRRC, Hsinchu
	An industrially manufactured CESR-type SRF module has been routinely operated at the Taiwan Light Source (TLS) at the National Synchrotron Radiation Research Center (NSRRC) since the beginning of March 2005. The original goals of doubling the electron beam current to increase the synchrotron light intensity and of eliminating the instability caused by the interaction of the electron beams with the cavity's higher-order modes have been successfully demonstrated. The greatest challenge to the operational reliability is the shortness of the mean time between failures, and has been successfully overcome. This work reports the commissioning experience of the SRF module at TLS for high beam-current operation toward a maximum beam current of 400 mA in top-up mode from 200 mA in decay mode over last two years. Emphasized will be the instrument development for analysis of SRF trip event and the continuous improvements of the operating analogous low-level rf system against instability of feed back loops caused by heavy beam loading.
	Slides

THYMA04	Development of Quarter Wave Resonators	linac, controls, coupling, damping	554
	A. Roy IUAC, New Delhi
	The accelerating structure for the superconducting linac booster for the 15 UD Pelletron at IUAC is a Nb QWR cavity, designed and fabricated as a joint collaboration between IUAC and ANL, USA. Initial cavities required for the first linac module were fabricated at ANL. For fabrication of cavities required for future modules a Superconducting Resonator Fabrication Facility has been set up at IUAC. Three quarter wave resonator (QWR) cavities have been fabricated and fifteen more resonators for the second and third linac modules are in advanced stage of completion. This facility has allowed us to undertake repairs on some of the resonators which sprung leaks. First experiment with the accelerated Si beam through the first linac module having eight resonators along with a superconducting solenoid have been conducted recently.
	Slides

THC2MA01	Design of The PEFP Low Beta Cryomodule	shielding, controls, linac, radiation	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.
	Slides

THZMA01	Status of SOLEIL Project	storage-ring, controls, insertion, feedback	578
	L. S. Nadolski, J. C. Besson, P. Brunelle, A. Buteau, L. Cassinari, M.-E. Couprie, J.-C. Denard, J.-M. Filhol, C. Herbeaux, J.-F. Lamarre, V. Le Roux, P. Lebasque, A. Lestrade, M.-P. Level, A. Loulergue, A. Madur, P. Marchand, A. Nadji, R. Nagaoka, B. Pottin, J. B. Pruvost, F. Ribeiro, M.-A. Tordeux SOLEIL, Gif-sur-Yvette
	SOLEIL, the 2.75 GeV new French Synchrotron Radiation Facility, located near Paris, is under commissioning. Here are reported the first main results obtained on the storage ring. The beam dynamics characterisation of the 3.7 nm.rad optics is presented, as well as the first measurements of the instability thresholds. Furthermore comparison is made with expectations of the linear optics model and instability calculations. First experience with innovative devices and technologies is also presented: TANGO control system, BPM system, extensive use of NEG coating vessels, RF system (Solid state amplifiers, and superconducting cavities). Six insertion devices accommodating a wide energy range from 5 eV to 50 keV (in-vacuum, Apple II, large period electromagnetic types) are now installed on the machine and some of them are giving the first photon beam to the beamlines. Finally a roadmap towards beam delivery to users will be presented (orbit stability, beam filling patterns, top-up operation).
	Slides

THZMA03	Construction of Shanghai Synchrotron Radiation Facility	storage-ring, power-supply, linac, controls	593
	Z. Zhao, H. Ding, H. Xu SINAP, Shanghai
	The Synchrotron Radiation Facility (SSRF), a third generation light source based on a 3.5GeV storage ring, is under construction at Zhang-Jiang Hi-Tech Park in Shanghai. The SSRF groundbreaking was made in December 2004 and the construction of the SSRF main and auxiliary buildings was completed in November 2006. The construction and installation of the SSRF accelerator components are under going with the target schedule of starting storage ring commissioning in April 2008 and the user operation in April 2009. This paper reports the construction progress of the Shanghai Synchrotron Radiation Facility.
	Slides

THC3MA02	SESAME Status	sextupole, dipole, storage-ring, synchrotron	610
	G. Vignola, A. Amro, M. Attal, H. Azizi, A. Kaftoosian, F. Makahleh, M. M. Shehab, H. Tarawneh, S. Varnasseri SESAME, Amman
	An update of the status of SESAME is presented. SESAME is a third generation light source facility, with an e-beam energy of 2.5 GeV, located in Allan, Jordan. The emittance is 26 nm.rad and 12 straights are available for insertion devices. The injector consists of a 22.5 MeV Microtron and 800 MeV booster synchrotron, with a repetition rate of 1 Hz. The conceptual design of the accelerator complex has been frozen, and the engineering design is well advanced. The Phase I scientific program for SESAME has also been finalized, and it foresees 6 beam lines, including 2 IR ports. The construction of the SESAME building is in progress, and the beneficial occupancy is expected by the spring of 2007. The completion of the accelerators complex construction is scheduled for 2010.
	Slides

THC3MA04	Status of the Novosibirsk High Power Terahertz FEL	radiation, electron, undulator, laser	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.
	Slides

THC3H101	Status of the Industrial RF-accelerators in BINP	electron, extraction, coupling, shielding	622
	V. Auslender, A. A. Bryazgin, V. G. Cheskidov, B. L. Faktorovich, V. Gorbunov, I. V. Gornakov, V. E. Nekhaev, A. D. Panfilov, A. I. Sidorov, V. O. Tkachenko, A. F.A. Tuvik, L. A. Voronin BINP SB RAS, Novosibirsk
	ILU type of industrial RF accelerators developed and producing in BINP involve the energy range from 0.5 to 5 MeV with power up to 50 kWt. Compact size of this type of the accelerators and no necessity of SF6 allows to use their in the wide spectrum of technology, including the food and drug treatment. Described the status of the novel ILU-12 accelerator with energy up to 5 MeV and power up to 300 kWt. BINP developed series of X-ray converters based on tantalum and wolfram targets. The family of ILU accelerators includes the ion accelerator ILU-9. This report involves the new radiation technologies which use ILU type of accelerators, based on e-beam, X-ray and ion beams.
	Slides

THC3H102	Practical Considerations in the Design of a High Current Commercial H-minus Cyclotron	cyclotron, injection, ion, ion-source	625
	M. P. Dehnel, P. T. Jackle, M. Roeder, T. M. Stewart, J. E. Theroux D-Pace, Nelson, British Columbia
	High current H-minus cyclotrons (>10⁰⁰ micro-Ampere) are being developed and implemented for radioisotope production, radioactive therapeutic implants and other applications. The beam dynamics and general physics design of these cyclotron systems must be well done. However, in order not to compromise an elegant and effective physics design, practical engineering considerations must be carefully considered and then implemented. Based on our experience in the design, upgrading, and maintenance of commercial H-minus cyclotron systems, we offer "best practices" to be considered in the engineering design and implementations of such systems.
	Slides

THPMA010	Structures of Quadrupole Magnet Core	quadrupole, pick-up, controls, magnet-design	640
	N. Li SLAC, Menlo Park, California
	In general, there are two different quadrupole core designs: two pieces (up half and low half cores) and four pieces (four quarter halves). Both structures work on those quadrupole magnets in different accelerators around the world. There is no certain rule about which design is good for what machine, it is most likely defends on the engineer’s favor and the coil size. There is advantage and disadvantage for both structures. However, the disadvantage of four pieces design is rather visible. It is the goal of this paper to study those advantages and disadvantages of two types of core structure from manufacturer’s point of view and the perturbations of the magnet field. * Iron Dominated Electromagnets

THPMA013	Effect of Eddy Current in Magnetic Lamination on Pulsed Septum Magnet Response	septum, injection, kicker, storage-ring	643
	R. S. Shinde, Gaud, V. K. Gaud, S. Kotaiah, Kumar, S. Kumar, R. K. Mishra, Pandey, M. M. Pandey, Pareek, P. Pareek RRCAT, Indore (M. P.)
	Indus-2 Pulsed septum magnets have been developed using 0.1 mm thick Ni-Fe laminations, which were electrically insulated from each other. These laminations were annealed in Hydrogen furnace & then oxidized in a Air controlled furnace. A process has been optimized to get 10-micron oxidization thickness on both sides of lamination. A pulse test set up has been built to characterize the laminations at high magnetization rates (‘~ 1 T/us). Electromagnetic simulation of the main field in the gap & field free region ' leakage/stray field for Septum magnets were performed using Flux 2D. A stray field (~1G-m) was stringent so as not to distort circulating beam. Magnetic screen has been optimized to minimize the stray fields. A pulsed thin & thick septum magnets were excited using 50 ms half sine wave, the field homogeneity in the order of 100 PPM & Integrated stray field 0.7 G-m has been obtained. This paper focus on Eddy current effect in lamination on pulse magnetic response, attenuation, phase shift & resonance in lamination due to pulse frequency. Modeling of magnetic circuit, shielding of septum & pulse response of NiFe lamination at high magnetic amplitudes(1.2T ) is also presented. R. K. Mishra, P. Pareek, M. M.Pandey, V. Gaud, S. Senthil kumar

THPMA014	Mechanical Stability of Open-type Quadrupole Magnets for a 2.5 GeV SRS (Indus-2)	quadrupole, magnet-design, multipole, dipole	646
	S. Konjeti, S. Das, M. G. Karmarkar, P. K. Kulshreshtha, K. Ruwali, K. Swarna RRCAT, Indore (M. P.) M. K. Ghosh BHU, Varanasi
	The open type Quadrupole magnets (Max. gradient: 16 T/m) for 2.5 GeV Indus-2 are made in C-configuration in which both of outer vertical sections of the steel are removed to take out the emerging synchrotron beam lines, in the region immediately adjacent to main dipole magnets of the ring. This induces engineering complexity relating to mechanical stability that critically controls the deviations in magnetic centre and field quality. To meet the stringent field quality requirements, the mechanical structure, which is precisely holding the magnet poles, is designed for minimum deflection at maximum gradient. The magnet is simulated with coupled field Emag-structural analysis, using ANSYS. The measurement of magnetic centre shift in prototype magnet assemblies with maximum excitation current is within 15 microns. The magnetic measurement results show that the higher order multipoles are low and not changing with excitation current. The optimized open-type Quadrupole magnet design is implemented in series production of all 32 magnets. The mechanical assembly accuracies and stability of series magnets with excitation are discussed in this paper.

THPMA015	Performance of 6 MW Peak, 25kW Average Power Microwave System for 10 MeV, 10 kW Electron LINAC	klystron, linac, gun, electron	649
	P. Shrivastava, P. Mohania, J. Mulchandani, Y. W. Wahnmode RRCAT, Indore (M. P.)
	An S-Band microawave system with peak power capability of 6MW and average power capability of 25 kW was designed, constructed and commissioned at RRCAT. The inhouse development of various microwave technologies and pulse modulator technologies was successfully achieved and the microwave system was interfaced to the 10MeV, 10kW electron LINAC. The electron LINAC could be tested to full rated energy and power using the present microwave system. The present paper highlights the details of the performance results.

THPMA017	Mathematical Model for Fast and Slow Dumping of K-500 Superconducting Cyclotron Magnet	dumping, cyclotron, power-supply, monitoring	655
	A. De, S. Saha, S. K. Thakur DAE/VECC, Calcutta
	A superconducting cyclotron (K-500) is under construction at Variable Energy Cyclotron Centre. Two superconducting coils ' named 'Alpha' and 'Beta' ' generates the main magnetic field of the cyclotron. Subsequent to the in-house fabrication of the two coils, it was assembled into the cryostat and the magnet assembly completed. Immediately after the cool down, the superconducting coils were energized. Two dump resistors ' slow and fast ' serve to dissipate the energy stored in the coils externally depending upon the situation. Various sets of data were collected during these dumping conditions and based on these an approximate mathematical model was constructed to simulate the dumping characteristics. This model took into account the lead drops, the cable and the joint resistances along with the dump resistor values and the self and mutual inductances (that varied with current) of the coil.

THPMA020	Ideal Coil-Shape for Perfect Field in Superconducting Sextupole Magnets	sextupole, quadrupole, dipole, superconducting-magnet	658
	P. R. Sarma DAE/VECC, Calcutta
	Coil dominated superconducting magnets have become essential components in high energy accelerators. Such magnets need to have very good field quality in order to preserve the beam emittance when it passes through the magnets a large number of times. It is well-known that the coil-shape generated by two displaced elliptic current distributions of opposite signs produce a perfect dipole field in the overlapping region. Similarly two intersecting concentric elliptic current distributions produce the perfect quadrupole field. The coil-shapes of practical superconducting magnets which are used in LHC, RHIC etc. are variations of such ideal designs. No mention of ideal coil-shape for a perfect superconducting sextupole magnet is available in the literature. In the present work we have explored the field produced by various coils shapes and found a coil shape which is capable of generating the perfect sextupole field. Parametric equation has been given for the x-y profile of the boundary of the coil cross-section. This finding should be useful in designing practical sextupole coils.

THPMA043	Development of 3 MeV, 30 kW DC Electron Accelerator at EBC, Kharghar	electron, controls, radiation, 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.

THPMA046	Study and Comparison of Reactive Power Compensation Schemes for Air-Core Transformer in ELV-type DC Accelerators	simulation, electron, synchrotron, impedance	688
	M. Borage, S. Kotaiah, S. R. Tiwari RRCAT, Indore (M. P.)
	The ELV-type electron accelerators are widely used in industrial and research applications. The scheme for generating high voltage in these machines is based on air-core transformer, which has large leakage inductance and small magnetizing inductance. To minimize the reactive power loading on the inverter feeding the primary winding, suitable compensation scheme must be employed. Conventional compensation scheme using shunt capacitor and a series inductor however can minimize the reactive power only at one particular loading condition. Also the compensating inductor becomes heavy and bulky. In this paper, the results of studies done to investigate suitability of various compensation networks are presented. Following desirable features are looked for: (1) Near-unity power factor operation under all loading conditions. (2) Nearly load independent output voltage. (3) Minimum additional reactive components. (4) Elimination of compensating inductor. Characteristics of compensation networks are studied and compared using simulation software PSpice wherein with the proposed method, normalized results suitable for comparison are directly obtained.

THPMA048	Study of Vacuum Related Problems During the Energization of K500 Superconducting Cyclotron	cyclotron, superconducting-magnet	694
	Z. A. Naser, D. L. Bandapadhaya, R. K. Bhandari, U. Bhunia, J. Debnath, M. Dutta, C. Mallik, S. Paul, A. Polley, J. Pradhan, A. Sur DAE/VECC, Calcutta
	The K500 superconducting cyclotron main magnet has been commissioned successfully in VECC, Kolkata. During the process of energization, it has been observed that there was vacuum deterioration in the cryostat vacuum chamber with excitations. Detail studies have been carried out to examine the occurrence of such a situation. The electro-magnetic stress in the cryostat wall due to Lorentz force increases with current, and is more pronounced in the median plane of cryostat wherefrom various penetrations come out. This could be the possible reason for the OVC vacuum degradation. The paper reports the observations on vacuum deterioration during energization. An extensive study has been carried out to understand and explain the situation.

THPMA050	Performance of Cryomodule and Cryogenic Network System for the Superconducting Linac at IUAC. Delhi	linac, cryogenics, ion, booster	697
	T. S. Datta, J. Antony, S. Babu, J. Chacko, A. Choudhury, S. Kar, M. Kumar, R. S. Meena, A. Roy IUAC, New Delhi
	The Superconducting Linear Accelerator as a booster of existing 15 UD Pelletron accelerator is under construction at IUAC. The heart of superconducting linac is three cryomodules, each one housing eight quarter wave niobium cavities. At present the first linac module along with superbuncher and rebuncher cryostat are integrated with zero degree beam line. Design and fabrication of two more linac modules under progress. A VME based CRYO-DACS has been developed to monitor and control parameters of cryostat. The total load at 4.2 K for complete system including locally developed liquid helium distribution line as well as break up load for each cryomodules has been measured. The measured load in linac module is higher than the design value. A detailed thermal analysis has been carried out using temperature profile for each component of cryomodules. Extra load is mainly contributed by aluminum structure,drive coupler and additional radiation load. The present paper will be highlighting the operating experience on cool down of linac as well as thermal performance of each cryo module. Scope of improvement on future linac cryo module to reduce the static load will also be covered.

THPMA051	Cure of Temperature Fluctuations on the Nitrogen-cooled Sections of a CESR-type SRF Module	controls, shielding, storage-ring, superconducting-RF	700
	M.-C. Lin, L.-H. Chang, M. H. Chang, S.-S. Chang, F.-T. Chung, M. H. Tsai, Ch. Wang, T.-T. Yang, M.-S. Yeh NSRRC, Hsinchu
	A strong correlation between tuner motion of the SRF module and the pressure fluctuation of the shielding liquid nitrogen flow is observed. The double elbow waveguide section with nitrogen cooling channels is one of the possible fluctuation sources. Thus it is tested along to investigate the mechanism of pressure and temerature fluctuations, whereas a phase separator with pressure regulation function is used to stabilize the supply pressure of liquid nitrogen. Also it is tried to stabilize the pressure fluctuation by optimizing and regulating the vent flow rate. System setup and primary test results are presented herein.

THPMA056	Design of the TPS Bending Chamber	synchrotron, storage-ring, synchrotron-radiation, 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.

THPMA058	Cyclotron RF Structures Leaks, Causes and Repair	cyclotron, ion, radioactivity, scattering	706
	D. P. Hajra, D. Adak, R. K. Bhandari, J. Chaudhuri, B. C. Mondal DAE/VECC, Calcutta
	Cyclotron at VECC, Kolkata, is delivering beam since 1977. Water leaks develops inside cyclotron after 30 years operation. Major leaks appear on thin walled copper cooling tube-brazed joints with sheet of R. F. panels, D-stem structures and aluminum & copper tubes trimmer capacitator. Radioactivity enhances ozone and nitrogen oxide, which also formed due to discharge of high electric field and subsequently formation of acid on copper tube and corrodes. Another source of corrosion is free chlorine ions from irradiated halogen containing products like cables etc, residual of cleaning chemicals and trapped brazing flux. Improper selection of brazing filler containing high percentages of zinc, cadmium and phosphorous which will promote porosity due to metal vaporization under high vacuum. Joining of different electro chemical potentials metal as done in trimmer capacitor causes corrosion.μleaks have been detected by MSLD then repaired by torch / TIG brazing with appropriate filler and fluxes has been cleaned thoroughly. Quality performance test has been conducted after repair by MSLD followed by hydraulic test repeated by MSLD both individual and gross leak. Cycloron down time increases becaues of water leaks and became major concern for smooth operation. Referance:1. CERN Accelerator School on Vacuum Technology -'992. ASM Handbook volume-6

THPMA059	The Vacuum System for the SSRF Storage Ring	storage-ring, photon, radiation, 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

THPMA066	Theoretical Analysis of the Recovery Times In Low Pressure Sparkgaps- Anode Temperature Decay Method	plasma, ion	726
	K. V. Nagesh, K. V. Nagesh BARC, Mumbai
	The recovery characteristics of the low-pressure sparkgaps in the time interval of 300*s to 50ms, with stainless steel electrodes, in the pressure range of 1 to 40Pa, for gap spacings of 2.5mm and 10mm, have been determined experimentally for hydrogen, argon and deuterium gases. Presently there are no methods ideally suitable for calculation of recovery times of low pressure sparkgaps. However an attempt has been made to analyze the recovery times of low pressure sparkgaps by anode temperature rise and decay method based on liquid and solid vapour phases here. The recovery times are calculated based on the reported data of anode drops. The solid phase recovery times are generally in good agreement with the experimental recovery times with higher load currents. The liquid phase recovery times are an order of magnitude low compared to the experimental recovery times. The recovery times are not in good agreement for positive polarity experimental recovery times due to non-uniformity in the gap. The theoretical calculation of liquid and solid phase recovery times, comparison of calculated / experimental recovery times and discussions are presented in this paper.

THPMA084	A Mechanical Installation Prototype for the SSRF Storage Ring	storage-ring, damping, dipole, quadrupole	755
	L. Yin, H. W. Du, D. K. Jiang, X. Wang, Z. B. Yan, C. H. Yu, Q. G. Zhou SINAP, Shanghai
	The engineering design of the mechanical system for the SSRF storage ring was finished. The first group components in each system, such as the magnets, vacuum chambers, BPMs, girders and other hardware, were fabricated and tested, respectively. In order to check the overall design and the installation procedure, a lattice cell prototype was installed by using these components. Based on it, the related utility system was installed and checked. The dynamic properties of the magnet-girder assembly were also tested in this prototype. Most of the design was confirmed during the installation, but still some problems were found. The modification for the overall design and some components design has been made before their mass production. The detail design and installation of the cell installation prototype and the test results are described in this paper.

THPMA085	Mechanical Coupling between the LHC Cryogenic Distribution Line and the Short Straight Section housing the Superconducting Quadrupole. Theoretical Analysis and Experimental Validation	alignment, coupling, collider, hadron	758
	S. Dutta, S. C. Bapna, J. Dwivedi, S. Kotaiah, A. Kumar, R. S. Sandha, H. C. Soni RRCAT, Indore (M. P.) C. Garion, A. Poncet, B. Skoczen CERN, Geneva
	The cryogenic module of the Short Straight Section (SSS) of Large Hadron Collider (LHC) is supplied with liquid & gaseous Helium through a jumper connection, which links the valve distribution box of the Cryogenic Distribution Line (QRL) & the SSS. The internal as well as external features of the jumper construction allow for sufficient flexibility to reduce the reaction forces responsible for elastic deformations when the SSS is moved for alignment. The SSS is composed of a cold mass and an external vacuum vessel equipped with fiducials for allowing the precise alignment of the machine when the cryostat is finally closed. A deformation of the structure from reaction forces induced by relative displacements of the SSS and the QRL, if unpredictable, would result in a dangerous misalignment of the quadrupole magnetic axis. A unified FE model, validated by a 40 meter long dedicated test setup at CERN, was generated at RRCAT to study the elastic behaviour of the SSS under the conditions of alignment. Transfer functions linking the action on the SSS external alignment jacks and the position of the cold mass are now available that will be used to properly align the machine in operation.

THPMA093	Vibration Evaluation for Utility Instruments and Water Piping System in TLS	storage-ring, quadrupole, controls, synchrotron	776
	Y.-H. Liu, J.-C. Chang, J.-R. Chen, D.-J. Wang NSRRC, Hsinchu
	In order to design the brightness new synchrotron light source-TPS in NSRRC. The vibration issue is more restrict nowadays. The position stability in subsystems is important to beam dynamic performance. The vibration source from utility systems is one source of the instability factor. The purpose of this paper is to estimate the vibration source from water systems, AHU systems and the piping system in utility group. Analysis the vibration path from ground and the piping system is the first step. Then, propose the feasible proposals to eliminate the vibration source and reduce the vibration propagation path. The construction standards for water systems and AHU systems will be established before design. The test is based on TLS operating systems. Besides, the distance and path between utility building and storage ring is another factor for vibration propagation. To eliminate the vibration source and propagation path in TLS will be the next step. The experimental results will be the foundation of TPS construction in the future.

THPMA094	SF6 Gas Handling System for 3 MeV, 30 kW Industrial Electron Beam Accelerator at EBC, Kharghar, Navi Mumbai	electron, controls, gun, instrumentation	779
	S. R. Ghodke, K. K. Abdullah, R. Barnwal, D. P. Chakravarthy, D. Jayaprakash, M. K. Kumar, N. Lawangare, R. L. Mishra, K. C. Mittal, K. Nanu, G. P. Puthran, A. K. Ray, S. B. Supriya, V. S. Veer BARC, Mumbai
	The 3 MeV Accelerator Project involves designing, fabrication, installation and commissioning of a 3 MeV, 30 kW Industrial Electron Beam Accelerator with a terminal voltage of 3 MV and is housed inside the Electron Beam Centre building at Kharghar, Navi Mumbai. The Accelerator has capability of delivering electron beam of 3 MeV energy for radiation processing applications. For ecological and economical reason, the SF6 gas is reincorporated into closed cycle because gas should not be released into the atmosphere. The aim of the SF6 gas handling system is to introduce the gas at high pressure to the accelerator tank after evacuation and to bring back into the storage tanks with minimum loss. The gas handling system also provides purification of gas, prevention from mixing with air or any other substances, which may contaminate and thus bring down the high voltage insulation characteristics of the gas. This paper discusses about mechanical design, fabrication, testing and safety of different components of SF6 gas handling system such as gas piping, non lubricating compressor, dryer, vacuum pump, dust & oil filters, storage tanks etc.

THPMA096	Installation and Integration of Indus-2	dipole, radiation, 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.

THPMA110	Status of BINP AMS Facility	ion, tandem-accelerator, ion-source, target	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.

THPMA118	Electron Accelerator of ELV-type and their Worldwide Application	electron, controls, extraction, radiation	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, radiation	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.

THPMA129	High Power Industrial Electron Accelerator	controls, electron, power-supply, industrial-accelerators	824
	S. C. Bapna, R. Banwari, M. Borage, A. Kasliwal, S. Kotaiah, A. Kumar, P. Kumar, R. Promod, S. R. Tiwari, S. V. Venkateswaran RRCAT, Indore (M. P.)
	Development of 2.5MeV/ 100kW air-core transformer type electron Accelerator is in progress at RRCAT in collaboration with BINP, Russia. Energy of the accelerator is variable from 1 to 2.5 MeV with maximum beam current, power and beam scanning width of 50mA, 100kW and 1.5m respectively. High voltage generator, accelerating tube and injector control unit are housed inside the tank filled with pressurized SF6. A 430Hz, 150kW input power source to high voltage generator is based on a high-frequency switching (25kHz) dual half-bridge inverter and modular in construction with 6 modules (each 30kW) operating in parallel. In case one module fails, remaining modules will continue to feed power without de-rating. In this scheme, transformer leakage and magnetizing inductances will be compensated with high voltage capacitors eliminating the need of bulky inductors. The beam is scanned in two mutually perpendicular directions using scanning magnets. The control system uses microcontroller ADuC 812 based cards. Each subsystem will have one such card and a single RS485 multidrop communication link with the PC. The accelerator will be useful for various industrial applications.

THPMA131	Indian Participation in LHC, SPL and CTF-3 Projects at CERN, Switzerland	dipole, linac, collider, klystron	829
	V. C. Sahni, V. B. Bhanage, J. Dwivedi, A. K. Jain, P. Khare, S. Kotaiah, A. Kumar, P. K. Kush, S. S. Prabhu, A. Puntambekar, A. Rawat, A. Sharma, R. S. Shridhar, P. Shrivastava, G. Singh RRCAT, Indore (M. P.) R. K. Sadhu BARC, Mumbai
	After signing a Protocol on 29 March 1996 to the 1991 cooperation agreement with CERN, Switzerland, India is participating in the construction of CERN’s most challenging and ambitious particle accelerator the “Large Hadron Collider” (LHC). The contributions span from hardware, software, and skilled manpower support for evaluation of some of the LHC sub-systems and presently to the support in commissioning of various subsystems of LHC. With major achievements on Indian part during the course of time CERN has now invited India to jointly participate further to build CERN’s Advanced Accelerator Projects like Super conducting Proton LINAC, SPL and Compact Linear Collider Test Facility, CTF-3. The present paper describes the achievements to date and high lights the ongoing and future collaboration activities.