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Title |
Other Keywords |
Page |
| MOZMA03 |
Status of FFAG Developments
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acceleration, focusing, synchrotron, proton |
21 |
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- S. Machida
STFC/RAL/ASTeC, Chilton, Didcot, Oxon
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Status of FFAG Developments will be talked, which includes nonscaling FFAG for muon acceleration, scaling FFAG for medical and industrial use. The talk focuses on beam dynamics points of view, as well as the on-going project around the world.
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Slides
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| TUC3H101 |
Optimization Of The BEPCII Lattice With Frequency Map Analysis
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injection, lattice, sextupole, radiation |
100 |
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- Y. Jiao, S. X. Fang, Q. Qin, Wang, J. Q. Wang, G. Xu, D. M. Zhou
IHEP Beijing, Beijing
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It is the first time of systemically applying the frequency map analysis (FMA) onto the lattice of BEPCII, which is an e±e? collider. We compute various parameters of the lattice with AT which the FMA code is imbedded in, and compared with that of MAD and SAD codes. The BEPCII colliding and injecting mode lattice are analyzed and optimized with FMA while turning the RF cavity and radiation on. Both on- and off-momentum frequency maps are overviewed. The transverse-longitudinal coupling resonance is found to be able to have large effects on the beam dynamics.
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Slides
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| WEC3H102 |
Fabrication and Performance Test of the Cavity BPM for KEK ATF2 and PAL XFEL
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coupling, pick-up, extraction, linear-collider |
336 |
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- J. Y. Huang, W. H. Hwang, S. H. Kim, S. J. Park, Y. J. Park
PAL, Pohang, Kyungbuk
- Y. Honda, I. Y. Inoue, T. Tauchi, J. Urakawa
KEK, Ibaraki
- M. C. Ross
Fermilab, Batavia, Illinois
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Precise, single shot measurement of the beam position with a sub-micrometer resolution is required for the next generation linear accelerators such as International Linear Collider (ILC) and X-ray Free Electron Laser (XFEL). As a pill-box cavity structure is sensitive to the transverse offset of the beam at the dipole-mode resonance, e.g., TM110-mode, a pill-box type cavity is a good candidate for the sub-micrometer beam position monitor (BPM). Test cavity BPM had been designed and tested in KEK successfully, and miscellaneous improvements for the final prototype fabrication and beam tests are performed in collaboration between KEK, SLAC and PAL. With the successful results of beam test in ATF, 41 cavity BPMs will be produced by PAL and installed in ATF2, which is an advanced beam-test line under construction as the extension of existing ATF for the beam studies on the final focus of the planned ILC program. Technical design considerations, fabrication and test results are described in this paper.
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Slides
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| WEPMA068 |
Comparison of the Methods for Beam Energy Spread Measurement at the VEPP-4M
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collider, betatron, wiggler, electron |
416 |
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| WEPMA083 |
Design of C-band Standing-wave Accelerating Structure
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coupling, bunching, electron, linac |
440 |
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- S. H. Kim, M.-H. Cho, W. Namkung, B. Park, H. R. Yang
POSTECH, Pohang, Kyungbuk
- S. D. Jang, J.-S. Oh, S. J. Park, Y. G. Son
PAL, Pohang, Kyungbuk
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We design a C-band standing-wave accelerating structure for a compact electron linac. It is capable to produce electron beams with the beam energy of 4 MeV and the pulsed beam current of 50 mA. It is to be operated in the π/2 mode with the on-axis coupled structure. The beamline is composed of the E-gun and the accelerating column with 3 and half bunching cells and 9 and half normal cells. We design standing-wave RF cavities using the OMEGA3P code to implement the asymmetric magnetic coupling slots. For the beam dynamics study, we use the PARMELA code with the SUPERFISH fields configuration. Without the pre-buncher cavity and the focusing magnets, the lost beam power to the wall is 10 kW for the output beam power of 200 kW, while the transmission is 58%.
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| WEPMA103 |
The Design And Performance of the Prototype Digital Feedback RF Control System For the PLS Storage Ring
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controls, feedback, linac, proton |
464 |
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- I. H. Yu, J. Y. Huang, H.-S. Kang, D. T. Kim, H. Y. Kim, S.-C. Kim, I. S. Park
PAL, Pohang, Kyungbuk
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The digital feedback RF control system for the Proton Engineering At the Pohang Light Source (PLS) Storage Ring, the low level RF system based on analog technique provides RF field control for the 4 RF stations, and each station drives each RF cavity at 500.082MHz. To achieve better control system stability and accuracy, the prototype digital feedback RF control has been developed in Pohang Accelerator Laboratory (PAL). In addition to RF field control, it provides cavity resonance control, and incorporates the personnel and machine protection functions. An accelerator electric field stability of ± 0.5% in amplitude and ± 0.5° in phase is required for the RF system. In order to accomplish these requirements, a digital feedback control technique is adopted for flexibility of the feedback and feed forward algorithm implementation. In this paper, the design and performance of this system will be presented with the performance test results.
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| WEPMA133 |
Evaluation of External Q Using Kroll-Yu Method With Microwaves Studio
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coupling, impedance, proton, superconductivity |
503 |
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- A. S. Dhavale, K. C. Mittal
BARC, Mumbai
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Design and development of superconducting cavity has been taken up as a part of Accelerator Driven Subcritical project(ADSS). An input coupler is designed for the same using Kroll-Yu method*. The evaluation procedure is optimized and the method has been successfully implemented for the evaluation high external Q**. The validity of the Kroll-Yu method is tested with the external Q calculations by P. Balleyguier method for the Benchmark cavtity which is a pillbox cavity of diameter ~200 mm, length ~150 mm with semi-rigid coaxial line***. It is found that the careful choice of data points provides accurate results over wide range.
* N. M.Kroll, D. U.L. Yu, "Computer determination of the external Q and resonant frequency of waveguide loadaed cavities", SLAC-PUB-5171, Jan1990(A) ** A. S.Dhavale and K. C.Mittal,"Evaluation of external Q of the superconducting cavity using Kroll-Yu method", Review Of Scientific Instruments 77, 066101 (2006)*** P. Balleyguier, "A straightforward method for cavity external Q computation", Particle Accelerators, Vol.57, P.113-127, 1997
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| THPMA032 |
Active Filter for Harmonic Mitigation for Magnet Power Supplies of INDUS-II
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impedance, power-supply, controls, feedback |
671 |
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- Y. P. Singh, S. Kotaiah, A. C. Thakurta
RRCAT, Indore (M. P.)
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Power supplies used for powering of magnets in INDUS-I and INDUS-II uses different type of power converters including SMPS and thyristorised power converters. Though considerations are given to keep the harmonic loading on a.c. mains low while designing these power supplies and selecting a suitable power converter for the required power, still they give a significant amount of harmonic loading on a.c. mains. In all the high power d.c. power supplies, wide variation in operating point leads to a considerable amount of reactive power generation and harmonic loading on ac mains. In this work a study has been performed to know the variation of reactive power with time on some of the d.c. power supplies of INDUS-II. Various options to improve the power factor has been studied and their advantages & limitations for accelerator magnet power supplies has been highlighted. A combined system of a shunt passive and small rated series active filter has been proposed. The compensation principle is described and filtering characteristics are discussed in detail. A scale down prototype of proposed series active filter has been developed in lab and experimental results produced.
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| FRYMA01 |
Experiences With The Hera Lepton-Proton Collider
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proton, luminosity, lepton, electron |
842 |
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