superconducting-RF

Paper	Title	Other Keywords	Page
MOPD005	Recent Activities in ILC R&D at Hitachi	vacuum, cryogenics, radiation, insertion	457
	T. Semba, Y. Itou, S. Kajiura, Y. Tsujioka, T. Yoshinari Hitachi Ltd., Ibaraki-ken M. Abe Hitachi, Ltd., Power & Industrial Systems R&D Laboratory, Ibaraki-ken H. Hayano, Y. Higashi, S. Noguchi, N. Ohuchi, K. Saito, K. Tsuchiya KEK, Ibaraki N. Torii Hitachi High-Technologies Corp., Ibaraki-ken
	We participated in the construction of STF (Superconducting RF Test Facility) cryomodule. This paper describes our recent activities in ILC R&D.
MOPD009	Status of the Superconducting Cavity Development for ILC at MHI	linac, diagnostics	463
	K. Sennyu, H. Hara, M. Matsuoka, T. Yanagisawa MHI, Kobe
	We report on the activities and achievements at MHI in the field of the superconducting cavity development for ILC. We describe especially the new procedures of cavity production for mass production.
MOPD014	First Test Results of ILC/STF Cryogenic System at KEK	cryogenics, booster, vacuum, linear-collider	472
	S. Kaneda, T. Ichitani Taiyo Nippon Sanso Corporation, Kawasaki-city Kanagawa Pref. K. Hara, K. Hosoyama, A. Kabe, Y. Kojima, H. Nakai, K. Nakanishi KEK, Ibaraki T. Kanekiyo Hitachi Technologies and Services Co., Ltd., Kandatsu, Tsuchiura M. Noguchi Mayekawa MFG. Co., Ltd., Moriya S. Sakuma, K. Suzuki Taiyo Nippon Sanso Higashikanto Corporation, Hitachi-city, Ibaraki-Pref J. Yoshida Hitachi Plant Technologies, Ltd., Tokyo
	The STF (Superconducting RF Test Facility) cryogenic system, of which capacity is 30W at 2.0K, has been constructed and commissioned for testing STF cryomodule. In the first operation phase, the STF cryogenic system was successfully cooled down to maintain a superconducting RF cavity at the working temperature of 2.0K. Presented in this session will be the results of the first operation of the cryogenic system and the future collaboration plan among KEK and Japanese cryogenic industrial members.
MOPP029	The First Measurement of Low-loss 9-cell Cavity in a Cryomodule at STF	feedback, klystron, coupling	610
	T. Saeki, M. Akemoto, S. Fukuda, F. Furuta, K. Hara, Y. Higashi, T. Higo, K. Hosoyama, H. Inoue, A. Kabe, H. Katagiri, S. Kazakov, Y. Kojima, H. Matsumoto, T. Matsumoto, S. Michizono, T. Miura, Y. Morozumi, H. Nakai, K. Nakanishi, N. Ohuchi, K. Saito, M. Satoh, T. Takenaka, K. Tsuchiya, H. Yamaoka, Y. Yano KEK, Ibaraki T. Kanekiyo Hitachi Technologies and Services Co., Ltd., Kandatsu, Tsuchiura J. Y. Zhai IHEP Beijing, Beijing
	We are constructing Superconducting RF Test Facility (STF) at KEK for the R&D of International Linear Collider (ILC) accelerator. In the beginning of year 2008, we installed one high-gradient Low-Loss (LL) type 9-cell cavity into a cryomodule at STF, where we assembled an input coupler and peripherals with the cavity in a clean room, and the assembled cavity packages were dressed with thermal shields and installed into a cryomodule. At the room-temperature, we performed the processing of capacitive-coupling input-coupler upto the RF power of 250 kW. At the temperature of 4 K, we measured the loaded Q of the cavity and the tuner was tested. At the temperature of 2 K, high-power RF was supplied from a klystron to the cavity and the performance of the cavity packeage was tested. This article presents the results of the first test of the Low-Loss (LL) 9-cell cavity package at 2 K in a cryomodule.
MOPP112	Status of the PEFP Superconducting RF Project	damping, linac, proton, controls	820
	S. An, Y.-S. Cho, B. H. Choi, C. Gao, Y. M. Li, Y. Z. Tang, L. Zhang KAERI, Daejon
	Superconducting RF project of the Proton Engineering Frontier Project (PEFP) aims to develop a superconducting RF linac to accelerate a proton beam above 80 MeV at 700 MHz. The preliminary design of a low-beta cryomodule has been completed. A low-beta (β=0.42) cavity, a higher-mode coupler and a fundamental power coupler (FPC) for the PEFP cavities have also been designed. A FPC baking system and high power RF conditioning system are under construction. A helium vesel made of stainless steel has been designed. A new tuner has also been designed. Two prototype copper cavities have been produced and tested. The HOM coupler has been measured on the copper cavities. A cryostat for a SRF cavity vertical testing has been designed.
MOPP113	PEFP Dumbbell Frequency and Length Tuning of a Low-beta SRF Cavity	linac, proton, target, controls	823
	S. An, Y.-S. Cho, C. Gao, Y. M. Li, Y. Z. Tang KAERI, Daejon L. Zhang Department of Mechanics, Chang’an University, Daejon
	Based on present technology, a dumbbell fabrication is a necessary mid-process for a cavity manufacting process. A dumbbell with a right length and frequency is necessary to build up a desired cavity. In order to obtain the exact frequencies of each individual half cell of a PEFP dumbbell, a new and confirmed measurement method has been established. In this paper, the dumbbell frequency measurement method and the frequency and length tuning practices for a PEFP low-beta cavity have been described.
MOPP120	Full Characterization of the Piezo Blade Tuner for Superconducting RF Cavities	insertion, controls, feedback, cryogenics	838
	A. Bosotti, C. Pagani, N. Panzeri, R. Paparella INFN/LASA, Segrate (MI) C. Albrecht, K. Jensch, R. Lange, L. Lilje DESY, Hamburg J. Knobloch, O. Kugeler, A. Neumann BESSY GmbH, Berlin
	Cavity tuners are mechanical devices designed to precisely match the resonant frequency of the superconducting (SC) cavity to the RF frequency synchronous with the beam. The blade tuner is mounted coaxially to the cavity and changes the resonator frequency by varying its length. A high tuning range is desired together with small mechanical hysteresis, to allow easy and reproducible resonator setup operations. High stiffness is also demanded to the tuner system both to ensure mechanical stability and to mitigate the frequency instabilities induced by perturbations. In high gradient SC resonators, the main sources of resonant frequency instability are the Lorentz Force Detuning (LFD) under pulsed mode operation, and the microphonic noise, in continuous wave (CW) with high loaded quality factors. Piezoceramic elements add dynamic tuning capabilities to the system, allowing fast compensation of these instabilities with the help of feed-forward and feedback loops. The piezo blade tuner has been extensively tested both at room temperature and at cold once assembled on a TESLA type cavity in its final configuration. This paper presents the summary of the complete characterization tests.
MOPP125	A Superconducting RF Vertical Test Facility at Daresbury Laboratory	radiation, shielding, cryogenics, controls	850
	P. A. Corlett, R. Bate, C. D. Beard, B. D. Fell, P. Goudket, S. M. Pattalwar STFC/DL/ASTeC, Daresbury, Warrington, Cheshire P. K. Ambattu, G. Burt, A. C. Dexter, M. I. Tahir Cockcroft Institute, Lancaster University, Lancaster
	A superconducting RF vertical test facility (VTF) has been constructed at Daresbury Laboratory for the testing of superconducting RF cavities at 2K. When fully operational, the facility will be capable of testing a 9-cell 1.3 GHz Tesla type cavity. The facility is initially to be configured to perform phase synchronisation experiments between a pair of single cell 3.9GHz ILC crab cavities. These experiments require the cavities to operate at the same frequency; therefore a tuning mechanism has been integrated into the system. The system is described, and data from the initial operation of the facility is presented.
MOPP131	Cryomodule Tests of the STF Baseline 9-cell Cavities at KEK	radiation, electron, linac, coupling	868
	E. Kako, H. Hayano, S. Noguchi, N. Ohuchi, M. Sato, T. Shishido, K. Watanabe, Y. Yamamoto KEK, Ibaraki
	The STF-Baseline superconducting cavity system, which includes four TESLA-type 9-cell cavities, input couplers and frequency tuners, has been developed for the future ILC project. A 6m-cryomodule including one of four STF-Baseline cavities was assembled for the initial test called the STF Phase -0.5. The first cool-down of the cryomodule and high power tests of the STF-Baseline cavity had been successfully carried at 2 K. The maximum accelerating gradient (Eacc,max) of 19.3 MV/m was achieved in a specific pulse width of 1.5 msec and a repetition of 5 Hz, (23.4 MV/m in a shorter pulse of 0.6 msec). The onset of x-rays radiation was observed at higher field than 15 MV/m, and the measured Qo value was about 5 x 109 at 18 MV/m in accompanied with field emission. The detuning angle of about -13 degrees at 18 MV/m was successfully compensated to nearly zero by a combined operation with both an offset detuning and an optimised applied voltage in the piezo element. String assembly of four STF-Baseline cavities has been stated in Jan. 2008. The second cryomodule test for 4 cavities, called the STF Phase -1.0, is scheduled in this early summer.
MOPP144	The First Cool-down Tests of the 6 Meter-Long-Cryomodules for Superconducting RF Test Facility (STF) at KEK	cryogenics, vacuum, linear-collider, collider	892
	N. Ohuchi, F. Furuta, K. Hara, H. Hayano, N. Higashi, Y. Higashi, H. Hisamatsu, K. Hosoyama, E. Kako, Y. Kojima, M. Masuzawa, H. Matsumoto, H. Nakai, S. Noguchi, T. Saeki, K. Saito, T. Shishido, A. Terashima, N. Toge, K. Tsuchiya, K. Yokoya KEK, Ibaraki M. H. Tsai NSRRC, Hsinchu Q. J. Xu IHEP Beijing, Beijing
	KEK is presently constructing the Superconducting RF Test Facility (STF) as the center of the ILC-R&D in Asia from 2005. In this project, KEK aims to get the manufacturing and operational experiences of the RF cavity and cryomodule toward the ILC, and two cryomodules have been developed. These cryomodules are 6 meter long and have 4 nine-cell cavities in each cryostat. The basic cross section designs of the cryomodules are almost same as the design of TESLA type-III, however, each cryostat has the different type of cavities, TESLA type and Low-Loss type. The tests for the cryomodules are planed to be performed at three steps. In the first test, measurements of the cryogenic performances of these cryomodules are the main objective. One nine-cell cavity was assembled in each cryostat and the cool-down of the two cryomodules was performed. In the following tests, the four nine-cell cavities will be assembled in each cryostat as the complete integration and the beam test will be performed. In this paper, we will report the design of the cryomodules and the cryogenic performances at the first cold test.
MOPP154	Study of the High Pressure Rinsing Water Jet Interactions	target, controls, linear-collider, collider	910
	D. Sertore, M. Fusetti, P. M. Michelato, C. Pagani INFN/LASA, Segrate (MI)
	High Pressure Rinsing (HPR) is an important step in the cleaning of Superconducting Cavities (SC). The understanding of the interaction of the high pressure water jet on the cavity wall is of primary importance for the optimization of this process for upcoming SC based projects like XFEL and ILC. In this paper, we extend our results obtained so far in different labs and present our studies on water jet interaction on oblique surfaces and the possible induced damages.
TUPC125	Status of the Spallation Neutron Source Superconducting RF Facility	vacuum, controls, cryogenics, radiation	1362
	F. Casagrande, S. Assadi, M. T. Crofford, W. R. DeVan, X. Geng, T. W. Hardek, S. Henderson, M. P. Howell, Y. W. Kang, J. Mammosser, W. C. Stone, D. Stout, W. H. Strong, D. C. Williams, P. A. Wright ORNL, Oak Ridge, Tennessee
	The Spallation Neutron Source (SNS) project was completed without on-site superconducting RF (SRF) facilities. Installation of the infrastructure necessary to maintain and repair the superconducting Linac and to support power upgrade research and development (R&D) is well underway. Installation of a Class10/100/10,000 cleanroom and outfitting of the test cave with RF, vacuum, controls, personnel protection and cryogenics systems is now complete. These systems were recently operated satisfactorily to test a cryomodule that had been removed from the accelerator and repaired in the cleanroom. A horizontal cryostat has been fabricated and will be soon commissioned. Equipment for cryomodule assembly and disassembly has been installed and used for cryomodule disassembly. Cavity processing equipment, specifically an ultra-pure water system, high pressure rinse system, and vertical test area is being designed and installed. This effort is providing both high-power test capability as well as long-term maintenance capabilities. This paper presents the current status and the future plans for the SNS SRF test facility.
TUPP160	Superconducting RF Activities at ACCEL Instruments	storage-ring, controls, damping, cryogenics	1884
	M. Pekeler, S. Bauer, P. vom Stein ACCEL, Bergisch Gladbach
	We report on highlights of SRF activities at ACCEL Instruments during the last few years. For example the development of a new hydrofloric and sulphoric acid free electropolishing method for niobium cavities and the construction and installation of a new standard electropolishing plant for 9-cell 1.3 GHz cavities. In addition we have further developed our design for 500 MHz superconducting RF modules for light sources and delivered three such accelerator modules for Shanghai Ligth Source. For SOLEIL we manufactured a 350 MHz twin cavity accelerator module using the technology of sputtering niobium onto copper.
WEOBM03	Development of a High Resolution Camera and Observations of Superconducting Cavities	superconductivity, linac, electron	1956
	Y. Iwashita, Y. Tajima Kyoto ICR, Uji, Kyoto H. Hayano KEK, Ibaraki
	An inspection system of the interior surface of superconducting RF cavities is developed in order to study the relation between the achievable field gradient and the defects of the interior surface. The achieved resolution is about 7 microns/pixel. So far there are good correlations between locations identified by a thermometry measurements and positions of defects found by this system. The heights or depths can be also estimated by measuring wall gradients for some well-conditioned defects. The detailed system and the data obtained from the system will be described.
	Slides
WEPC008	Status of the SSRF Storage Ring	storage-ring, feedback, site, vacuum	1998
	Z. M. Dai, D. K. Liu, L. G. Liu, L. Yin, Z. T. Zhao SINAP, Shanghai
	The SSRF storage ring is composed of 20 DBA cells with energy of 3.5GeV and circumference of 432m. The installation of the SSRF storage ring was started on June 11, 2007, and finished in the beginning of Dec. 2007. The system tests of hardware and software for storage ring were completed in the middle of Dec. 2007. The commissioning of the storage ring started on Dec. 21, 2007, and the 100mA stored beam was achieved for the first time on Jan. 3, 2008. The design, installation and commissioning of the SSRF storage ring are described in this paper