sextupole

Paper	Title	Other Keywords	Page
TUC2MA02	Design of the Transfer Lin·10-2 for the CTF-3 at CERN	quadrupole, dipole, 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%.
	Slides
TUC3H101	Optimization Of The BEPCII Lattice With Frequency Map Analysis	resonance, injection, lattice, radiation	100
	Y. Jiao, S. X. Fang, Q. Qin, Wang, J. Q. Wang, G. Xu, D. M. Zhou IHEP Beijing, Beijing
	It is the first time of systemically applying the frequency map analysis (FMA) onto the lattice of BEPCII, which is an e±e? collider. We compute various parameters of the lattice with AT which the FMA code is imbedded in, and compared with that of MAD and SAD codes. The BEPCII colliding and injecting mode lattice are analyzed and optimized with FMA while turning the RF cavity and radiation on. Both on- and off-momentum frequency maps are overviewed. The transverse-longitudinal coupling resonance is found to be able to have large effects on the beam dynamics.
	Slides
TUPMA049	Development of an Injector to Generate a Very Short Bunch for a Super Coherent Terahertz Light Source Project	gun, cathode, simulation, emittance	178
	T. Tanaka, K. Akiyama, H. Hama, F. Hinode, K. Kasamsook, M. Kawai, T. Muto, K. Nanbu, M. Yasuda Tohoku University, School of Scinece, Sendai N. Kumagai, H. Tanaka JASRI/SPring-8, Hyogo-ken
	A project to develop a coherent Terahertz (THz) light source is in progress at Laboratory of Nuclear Science, Tohoku University. The coherent synchrotron light in the THz region is emitted from electron bunches with a very short bunch less than 100 fs (rms) generated by a thermionic RF gun and a sophisticated bunch compressor. As an injector of this ring, we have developed an independently tunable cells (ITC) RF gun and a magnetic bunch compressor. The longitudinal phase space extracted from the ITC-RF gun can be manipulated by feeding RF microwave to cells independently. To generate a short bunch with a significant bunch charge, a magnetic compressor is used downstream from the gun. Two kinds of bunch compressors have been studied. From simulation of an injector, we have got a very short bunch length about 42 fs (rms). A prototype of the gun has been manufactured. Results of low power tests of the gun will be presented.
TUPMA056	Injection of Beam Shaped Locally with Nonlinear Optics	injection, octupole, emittance, septum	187
	C.-X. Wang ANL, Argonne, Illinois
	We discuss nonlinear beam shaping by octupole and sextupole to fold the tail of a Gaussian beam into its core, for the purpose of improving betatron injection in storage rings by significantly reducing the beam width at the injection septum and thus reducing beam centroid offset from the stored beam. Necessary conditions as well as challenges for such nonlinear injections are explored.
WEPMA058	Tune and Lifetime Studies at the Australian Synchrotron	quadrupole, kicker, synchrotron, injection	401
	M. J. Spencer, M. J. Boland, R. T. Dowd, G. LeBlanc, Y. E. Tan ASP, Clayton, Victoria
	The 3GeV Australian Synchrotron will begin operation in March 2007. This paper outlines the tune and lifetime measurement systems. It also provides a summary of a number of studies completed using these systems. Three different tune measurement systems have been tested. Lifetime measurements made using the DCCT were used to optimise the strengths of the harmonic sextupoles and the location of the tunes. The vertical aperture was determined using scrapers. Beta-function measurements have been completed by shunting individual quadrupoles and noting the resultant tune changes. Chromaticity measurements have been made by observing the change in tune as the RF frequency is varied.
WEPMA085	Implementation and Experience of Energy Ramping for Indus-2	controls, power-supply, dipole, quadrupole	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.
THC2MA02	Experiences with the Manufacturing, Testing and Quality Control of Large Number of Superconducting Magnets	controls, cryogenics, monitoring, dipole	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.
THC3MA02	SESAME Status	vacuum, 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
THPMA008	Field Measurement Results of the Quadrupole Magnets for ATF2	quadrupole, extraction, power-supply, coupling	637
	M. Masuzawa, Y. Suetsugu, R. Sugahara KEK, Ibaraki
	ATF2 will be built at KEK as a test facility for the final focus system for the ILC. The specifications for the final focus system require transverse focusing of the electron beam to be nearly 40 nm. The quadrupole magnets for the ATF2 beam line have been designed and manufactured. The diameter of the magnet bore is 32 mm and the length is 180 mm. The magnets have to meet strict specifications for the multipole components, especially the sextupole components, in order to achieve the required small beam size. Precision measurement is required not only for the multipole components but also for the magnetic center and median plane. Field measurement results of these small bore magnets will be reported.
THPMA020	Ideal Coil-Shape for Perfect Field in Superconducting Sextupole Magnets	quadrupole, dipole, 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.
THPMA083	The Magnet Alignment Method For The J-PARC Main Ring	target, alignment, site, quadrupole	752
	M. J. Shirakata, K. Ishii, K. Niki, K. O. Okamura, T. Oogoe, E. Yanaoka, M. Yoshioka KEK, Ibaraki
	In the J-PARC site, the inflastructure for the whole site measurement is planned for the global alignment of the accelerator components. For the neutrino experiments, the J-PARC main ring must be directed to the SUPER-KAMIOKANDE exactly. The global measurements from the Kamioka site to the J-PARC site is carried out by using GPS system on the gound level. Several measurement holes, in order to tranport the coodinates from the ground level into the accelerator floor level directly, are prepared around the J-PARC accelerator complex. The magnet alignment method for the J-PARC main ring are reported with the present alignment status.