APAC 2007 - List of Keywords (dipole)

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

dipole

Paper	Title	Other Keywords	Page
MOOPMA04	Crab Cavity Development	vacuum, superconductivity, luminosity, 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.
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TUXMA01	LHC Status	quadrupole, cryogenics, injection, insertion	46
	L. R. Evans CERN, Geneva
	The installation of the Large Hadron Collider at CERN is now approaching completion. Almost 1100 of the 1232 main bending magnets are installed and the whole ring will be installed by the end of March 2007. Emphasis is now moving from installation to commissioning, with the cool down of the first of the 8 sectors to liquid helium temperature well underway. In the other sectors, interconnect work is proceeding at a satisfactory pace and will be finished by the end of August. It is foreseen to inject the first beam into the LHC in November with the objective of having first collisions at the injection energy (450 GeV/c) in order to debug the machine and detectors before stopping for the annual winter shutdown. During this time, the detector installation will be finished and the machine will be pushed to full current ready for the first physics run at 7 TeV per beam in 2008.
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TUC2MA02	Design of the Transfer Lin·10^-2 for the CTF-3 at CERN	quadrupole, sextupole, controls, lattice	71
	A. Sharma, A. D. Ghodke, A. Rahim, G. Singh RRCAT, Indore (M. P.)
	The design of the Transfer Lin·10^-2 (TL-2), which will transfer an electron beam from the Combiner Ring (CR) to CLEX area (CLIC experimental area) of CTF-3 at CERN, is presented in this paper. This line will be used to control the bunch length and Twiss parameters at the entrance to the CLEX area. The line will have a wide tunability of R56 parameter, ranging from –0.35 to +0.35m. This has been designed considering the constraints imposed by the building geometry and the magnetic elements to be used. The design optimization of the line has been done up to second order for the entire R56 range, keeping T566 practically zero and emittance dilution below 10%.
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TUZMA02	Operation for LHC Cryomagnet Tests: Concerns, Challenges & Successful Collaboration	cryogenics, superconducting-magnet, target, 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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TUZH103	Electron Cloud Experiments, Simulation and Cure	electron, simulation, feedback, quadrupole	89
	H. Fukuma KEK, Ibaraki
	A large number of electrons called electron clouds have been observed both in positron and hadron accelerators. Possible sources of the electron clouds are photoelectrons generated by synchrotron radiation, electrons produced by beam hitting vacuum components, electrons multiplied by beam induced multipacting, electrons created by ionization of residual gasses and so on. The electron clouds produce various effects such as pressure rise, heat load on a cold chamber wall, beam induced multipacting, betatron tune shifts, coupled bunch instability and beam size blow-up which often limit the performance of the accelerators. Many experimental and theoretical studies on the electron clouds have been carried out and their results have contributed to the improvement of performance of existing accelerators and design of future accelerators. This talk reviews experiments, simulations and cures of the electron cloud effects in positron and hadron accelerators.
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TUPMA023	Project of 2 GeV Synchroton Light Source for the Republic of Kazakhstan	lattice, synchrotron, emittance, radiation	136
	E. Antokhin, G. Kulipanov, N. A. Mezentsev, V. E. Panchenko, A. V. Philipchenko, A. V. Utkin, K. Zolotarev BINP SB RAS, Novosibirsk K. K. Kadyrzhanov, S. N. Lyssukhin INP NNC RK, Almaty
	Applications of synchrotron radiation (SR) are very popular for last time in many research fields. Thus a developing of compact source for generation of hard X-ray synchrotron radiation is very actual task. The goal of this work is a developing project of SR source for Republic of Kazakhstan. This storage ring mainly dedicated for performing the high sensitive X-ray fluorescence analysis of different natural samples to be used for ore exploration, ore processing and metallurgy . But implementations of other popular techniques applied for research and education with using synchrotron radiation (XAFS, XRD, etc) are also possible. This report includes a detailed description of main parameters and magnetic structure of designed storage ring as well as preliminary design of injector system.

TUPMA059	Beam Dynamics Effects with Insertion Devices for the Proposed 3 GeV Ring in Taiwan	emittance, lattice, synchrotron, synchrotron-radiation	196
	H. C. Chao, C.-C. Kuo NSRRC, Hsinchu S.-Y. Lee IUCF, Bloomington, Indiana
	The effects of insertion devices on beam dynamics of storage rings were studied. We will focus on the changes of the emittance and energy spread in the presence of insertion devices. Formulas for the beam emittance and the energy spread with insertion devices are also derived, in which an intrinsic parameter depending on the design of the lattice is introduced in the calculations. Simulation results and comparisons of achromatic and non-achromatic cases in the proposed 3 GeV synchrotron radiation light source in Taiwan are shown.

WEZMA02	China Spallation Neutron Source Design	linac, target, injection, proton	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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WEPMA002	A Large Area Scanning Magnet For Homogeneous Irradiation of Targets	power-supply, controls, impedance, ion	339
	A. Mandal, R. Kumar, G. Rodrigues, S. K. Suman IUAC, New Delhi
	The scanner is an important tool for accelerator based material science research. For high energy (~100 MeV) ion beam scanner has to be magnetic one. Major problem faced with magnetic scanner is its high inductance which causes large impedance to the a.c. power supply used to energise the magnet. We have designed a magnetic scanner keeping attention to minimise its inductance. The scanner is composed of two independent H-type dipole magnets which are fed by saw tooth pulses. It can scan over an area of 25 mm x 25mm at a distance of 1 metre. The power supplies for this scanner have also been designed. These are bipolar, wideband, high speed amplifirs that can reproduce complex waveform without any distotion. The ratings are 60V, 50A operating at 50Hz for x-scanner and 5V,70A at 0.2Hz for y-scanner. Design and performance of the scanner magnet and power supplies will be presented.

WEPMA039	Effect of Magnetic Field Coupling On INDUS-2 Quadrupole Magnets	quadrupole, simulation, coupling, multipole	378
	G. Sinha, A. Kumar, A. Mishra, G. Singh RRCAT, Indore (M. P.)
	The distances between the magnets in the Indus-2, are small and as a result, the magnetic field of one magnet may affect the fields of the adjacent magnets. Therefore, it is important to find out the effect of mutual coupling between magnets in the actual condition in the ring and the ways to overcome this problem. In this paper, we will discuss how the field quality of Quadrupole magnets (QPM) in the ring is affected when accompanied by various corrector dipole magnets (CDM)(vertical and horizontal) and sextupole magnets (SPM). Variation of integrated quadrupole strength in presence of CDM is measured at various field excitations and also by varying the distance between the magnets using a rotating coil. Experimental results are compared with the results obtained from 3D simulations. Possibilities of studying the interference effect by scanning the field by a Hall probe, is explored. Dependence of field interference on the distance between magnets, pole gap and the steel length are studied. Effects of the adjacent magnets on the higher order multipole of QPM are also examined.

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

WEPMA085	Implementation and Experience of Energy Ramping for Indus-2	controls, power-supply, quadrupole, sextupole	443
	R. K. Agrawal, A. Chauhan, P. Fatnani, R. Husain, K. Saifee, M. Seema, Y. M. Sheth, G. Singh RRCAT, Indore (M. P.)
	Beam energy ramping in Synchrotron Radiation Sources (SRS) requires synchronous increase in power supply currents attached to various magnets. This paper describes the implementation at various layers of control system architecture, experience of ramping beam energy from injection energy to 2 GeV. The total Ramping system hardware and software for both Magnet power supplies and RF cavity voltage are described with problems faced during the energy ramping. The implemented ramping system provides a tracking uncertainty less than 10μsec in time.

THXMA03	Construction and Commissioning of the HIRFL-CSR	injection, ion, acceleration, accumulation	534
	J. W. Xia, Y. He, Y. Liu, J. C. Yang, X. D. Yang, W.-L. Zhan, Y. yuan IMP, Lanzhou
	CSR is a new ion cooler-storage-ring system in China IMP, it consists of a main ring (CSRm) and an experimental ring (CSRe). The two existing cyclotrons SFC (K=69) and SSC (K=450) of the Heavy Ion Research Facility in Lanzhou (HIRFL) will be used as its injector system. The heavy ion beams from HIRFL will be first injected into CSRm, accompanying with the accumulation, e-cooling and acceleration, finally extracted to CSRe for many internal-target experiments. In 2005 the main construction of the CSR project was finished, and from that the preliminary commissioning of CSRm was started, including the first turn commissioning as a beam line, the stripping injection, and the zero-bumping orbit test, fixed-bumping orbit test with four in-dipole coils, bumping orbit test, C-beam accumulation and the investigation of the closed orbit with BPM. And now the correction of closed orbit, e-cooling and ramping tests are just on going.
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THC2MA02	Experiences with the Manufacturing, Testing and Quality Control of Large Number of Superconducting Magnets	controls, cryogenics, sextupole, monitoring	567
	A. Puntambekar, M. Bagre, V. Jain, M. G. Karmarkar, P. Khare, S. Kotaiah RRCAT, Indore (M. P.) G. Mugnai, R. Wolf CERN, Geneva
	Raja Ramanna Centre for Advanced Technology has successfully completed the supply of nearly 2000 nos. Superconducting Corrector (SC) Magnets for the LHC project at CERN. Initial prototypes were developed at RRCAT in collaboration with CERN and large scale production was done in industry. These corrector magnets require precision components, accurate assembly procedure, elaborate testing and stringent quality control required for repeatable performance. A number of sub technologies were developed for these magnets at RRCAT and successfully transferred to Industry. These include precision coil winding, joining SC wire to get low contact resistance, measuring it at 4.2 K. Ultrasonic welding machine and automatic coil winding machines were developed. Cryogenic testing procedures and test facility were established at RRCAT. SC switches and current leads were designed and fabricated. Cryogenic testing at 4.2 K and magnetic measurement at 300 K for all the 2000 magnets were done at RRCAT. Special tooling and inspection gauges for in process inspection were made. In this paper we describe the experience gained during technology development, prototyping and technology transfer to industry.

THC2MA03	Design of L-band Superconducting Cavity for the Energy Recovery Linacs	damping, quadrupole, linac, simulation	570
	K. Umemori, T. Furuya, S. Sakanaka, T. Suwada, T. Takahashi KEK, Ibaraki H. Sakai, K. Shinoe ISSP/SRL, Chiba M. Sawamura JAEA/ERL, Ibaraki
	The ERL project in Japan has been started with the cooperation of?KEK, JAEA, ISSP and other SR institutes. For the ERL, superconducting cavities are key components to achieve high energy, high current and low-emittance electron beams. One challenging task, required for the cavity, is a strong damping of the higher-order-modes (HOMs), since they could cause the beam-breakup instabilities and the significant heat load on the cryomodule. We are proceeding with the cavity design, which is optimized for ERLs, with concentrating our attention on HOM damping. A large diameter beam-pipe with microwave absorber is adopted as HOM damping scheme. It can extract the HOM power effectively. We have also investigated optimization of the cavity shape for further suppression of the HOMs. In this report, our cavity design and its HOM characteristics are presented.
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THC3MA02	SESAME Status	vacuum, sextupole, 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.
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THC3MA03	NSLS-II Design: A Novel Approach to Light Source Design	emittance, lattice, damping, wiggler	613
	S. L. Kramer, J. Bengtsson, S. Krinsky, V. Litvinenko, S. Ozaki BNL, Upton, Long Island, New York
	The NSLS-II storage ring will be a replacement for the existing NSLS light source rings, which although innovative when proposed was rapidly overtaken by storage ring design capabilities. NSLS-II design[1] takes a new approach toward providing users with the brightest beams after commissioning and a strategy of evolving to higher brightness beams as more ID devices are installed during its operating period. This is achieved not by pushing the basic lattice to lower emittance, an approach that hits severe limits in the control of the dynamic aperture of an ever increasing non-linear lattice. Our approach is rather to provide the additional emittance reduction naturally with the installation of additional user undulator's or adding high power damping wigglers. Some of the damping wigglers will have variable gap and can be used to maintain a given emittance as the additional user undulators are installed. The details on the lattice design for the high brightness beams and the control of stability of these high power beams is presented. *ozaki@bnl.gov
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THPMA014	Mechanical Stability of Open-type Quadrupole Magnets for a 2.5 GeV SRS (Indus-2)	quadrupole, magnet-design, multipole, vacuum	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.

THPMA020	Ideal Coil-Shape for Perfect Field in Superconducting Sextupole Magnets	sextupole, quadrupole, vacuum, 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.

THPMA084	A Mechanical Installation Prototype for the SSRF Storage Ring	vacuum, storage-ring, damping, 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.

THPMA086	Precise Survey and Alignment of Synchrotron Radiation Source Indus-2	alignment, controls, survey, quadrupole	761
	V. Prasad, D. Barapatre, M. Jagannath, R. K. Sahu, K. P. Sharma, G. Singh RRCAT, Indore (M. P.)
	The 2.5GeV third generation synchrotron light source Indus-2 at RRCAT, which in advance stage of commissioning, demanded a high precision of survey and alignment of all its components. In particular, we had to control the transverse and azimuthal positions of all quadrupoles and dipoles within a relative accuracy of 0.1 mm and overall circumference within 2.5 mm. This required a tight control over all the sources of errors starting from fiducializations, survey of networks, final alignment and smoothing. We have successfully accomplished this task by adopting the triangulation-trilateration technique of survey and alignment along with indigenously developed software for online survey data collection, least square adjustment of redundant measurements and error analysis. The accuracy of alignment was reflected from the successful circulation and storage of electron beam in the machine with a very small closed orbit distortion. This paper, in brief, presents the methodology adopted for survey and alignment and final accuracies achieved.

THPMA096	Installation and Integration of Indus-2	vacuum, 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.

THPMA131	Indian Participation in LHC, SPL and CTF-3 Projects at CERN, Switzerland	linac, vacuum, 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.