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PLT006 |
Recent Progress in Superconducting Cavity Production |
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- E. Kako
KEK, Ibaraki, Japan
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Overview of recent progress on superconducting cavity production and high gradient performance in 1.3 GHz 9-cell cavities for ILC is presented and discussed.
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Slides PLT006 [6.123 MB]
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WG3001 |
Superconducting RF for Energy Recovery Linacs of eRHIC |
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- S.A. Belomestnykh, H. Hahn, G.J. Mahler, R. Than, W. Xu
BNL, Upton, Long Island, New York, USA
- I. Ben-Zvi
Stony Brook University, Stony Brook, USA
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Funding: Work is supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. DOE.
A six-pass ERL will provide 50-mA electron beam for collisions with hadrons in eRHIC. The two main linacs are based on the BNL-3 704 MHz 5-cell elliptical SRF cavities. At full energy of 30 GeV, the length of each linac will reach 200 m. In addition to the main ERL, two smaller single-pass ERLs will be used as 1) 600-MeV injector into the main ERL, and 2) source of 70-mA electron beam for coherent cooling of the hadron beam. This paper describes the design of the SRF cavity and cryomodule, requirements to for the RF system, and plans for prototyping various components.
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Slides WG3001 [3.687 MB]
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| WG3002 |
Fabrication of Superconducting RF Cavity at MHI |
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- H. Hitomi, H. Hara, F. Inoue, K. Kanaoka, K. Sennyu, T. Yanagisawa
MHI, Kobe, Japan
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We have supplied some 1.3 GHz superconducting RF cavities for STF project and cERL project for few years. Recently, we have manufactured STF pahse 2.0 cavities (MHI-#12～#22). Some of those achieved ILC specification in vertical test at KEK. We have also manufactured three 2 cell cavities for injector modules of cERL and two 9 cell cavities for main linac modules of cERL. These cavities were governed to high pressure gas safety law in Japan. We report recent activities of superconducting RF cavity at MHI in this conference.
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| WG3003 |
HOM Properties of Main Linac for cERL in Japan |
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- M. Sawamura
Japan Atomic Energy Agency (JAEA), Gamma-ray Non-Destructive Assay Research Group, Tokai-mura, Ibaraki-ken, Japan
- E. Cenni
Sokendai, Ibaraki, Japan
- T. Furuya, H. Sakai, K. Umemori
KEK, Ibaraki, Japan
- K. Shinoe
ISSP/SRL, Chiba, Japan
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Two types of HOM absorber models were designed and fabricated. One type was almost actual shape except for HIP ferrite. The other was the center part of HOM absorber where ferrite was HIPped. Both models were used to estimate the cooling properties such as thermal conductivity and thermal cycle tolerance. The model with ferrite was also used to estimate the HOM absorption installing to the 9-cell cavity at the room temperature. The measured results will be presented.
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Slides WG3003 [2.204 MB]
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WG3004 |
Review of Cryomodules and SRF Challenges for Light Source Energy Recovery Linacs |
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- R. Nassiri
ANL, Argonne, USA
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Funding: Work supported by U.S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357.
Superconducting rf (SRF) is the technology of choice for future high average beam current energy-recovery linac (ERL)-based as well as Free Electron Laser (FEL)-based light source facilities. ERL- and FEL-based light sources are required to run in a continuous wave (cw) mode as compared to the International Linear Collider (ILC), which requires a moderate repetition rate. The difference in the two operating modes (low duty factor and cw) will necessitate a fresh look at the SRF parameter space specifically suited for light source ERLs and FELs. There are still open questions regarding the choice of rf frequencies, cryomodule design, cavity cell design and number of cells, Q factor, accelerating gradient and higher-order-mode damping. In addition, the cryoplant for such facilities will need to be designed to handle on the order of tens of kW of cooling at 2°K. The existing cryoplants cannot provide a level of efficiency to make it cost effective to operate such facilities. In this paper we will review and present current R&D efforts in SRF cavities and cryomodules for high average beam current operation.
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Slides WG3004 [2.017 MB]
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WG3005 |
Progress of cERL injector cavities at KEK |
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- K. Watanabe, E. Kako, S. Noguchi, T. Shishido, K. Umemori
KEK, Ibaraki, Japan
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The injector cryomodule for cERL is under developing at KEK. This cryomodule with three L-band 2-cell cavities will be constructed until March 2012. Three L-band 2-cell cavities with five HOM couplers for this module were fabricated at May 2011. Now, these cavities are under testing by vertical test, and the feedthoughs with high thermal conductivity are also under developing for HOM couplers using by these tests to achieve 15 MV/m operation at CW in cryomodule. The results of vertical test for three 2-cell cavities with HOM pick-up probes will be reported in this paper.
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Slides WG3005 [0.902 MB]
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| WG3006 |
Development of Input Coupler for Compact ERL Main Linac |
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- H. Sakai, T. Furuya, N. Nakamura, M. Sato, K. Umemori
KEK, Ibaraki, Japan
- E. Cenni
Sokendai, Ibaraki, Japan
- M. Sawamura
JAEA, Ibaraki-ken, Japan
- K. Shinoe
ISSP/SRL, Chiba, Japan
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We fabricated the prototype of an input coupler, which has two ceramic windows to keep the inside of the superconducting cavity clean, for ERL main linac and performed the high power test. Required input power is about 20kW with standing wave condition for the cavity acceleration field of 20MV/m. In this high power test, the one ceramic window, named as a cold window, was installed into the vacuum insulating chamber and cooled by liquid Nitrogen. First, the multipacting at 10kW level prevented the power increasing. By using the pulse processing method for 8 hours, power finally reached the 25kW with standing wave condition. We could also keep feeding 20kW power into coupler for 16 hours. From these results of high power test, this prototype coupler satisfied our thermal and RF requirements.
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Slides WG3006 [5.352 MB]
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| WG3016 |
Long-Term Monitoring of 3rd-period EP-electrolyte in STF-EP Facility at KEK |
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- M. Sawabe., H. Hayano, A. Komiya, H. Monjushiro, T. Saeki, M. Satou
KEK, Ibaraki, Japan
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We have constructed an Electro-polishing (EP) Facility in the Superconducting RF Test Facility (STF) at KEK at the end of 2007. We have been operating the EP facility since January 2008 and have performed the EP- processes of cavities about 200 times up to the present. We changed EP-electrolyte in the 2,000L tank three times until now. And we use the 4th-period EP-electrolyte now. We presented the long-term monitoring result of the 2nd-period EP-electrolyte so far. In this report, we present the long-term monitoring results of the 3rd-period EP-electrolyte, the correlation between EP-process data and the change of fluorine chemical species by EP-electrolyte aging, the result that we could achieve good performance by the EP-electrolyte old enough. And we want to suggest the new EP chemical equation.
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Slides WG3016 [1.941 MB]
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WG3019 |
Operation of 2K Cryogenic System for Superconducting RF Cavities at STF |
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- H. Nakai
KEK, Ibaraki, Japan
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Our experience on the operation of 2K cryogenic system for the superconducting RF cavities will be presented. Production method of superfluid helium and the 2K cryogenic system at STF will be also introduced in this presentation.
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Slides WG3019 [8.743 MB]
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WG3021 |
Microphonics observed at STF (Superconducting rf Test Facility) in KEK |
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- S. Michizono
KEK, Ibaraki, Japan
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Pulsed rf operation of eight SC cavities were carried out at STF in KEK this year. These cavities are operated at 1.3 GHz (1.5 ms, 5 Hz) at high gradient (max. >30 MV/m). The cavities came from DESY, FNAL and KEK and have slightly different couplers and structures. The detuning of the cavities were calculated and these values will be reported.
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Slides WG3021 [1.614 MB]
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WG3023 |
Performance Study of the Tuner for cERL Main Linac |
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- K. Enami
KEK, Ibaraki, Japan
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The tuner is one of the most important components for keeping the ERL operation stably. Many type of tuner system were developed all over the world. Our tuner is based on slide jack tuner and piezo tuner as frequency tuning system. This slide jack tuner is originally developed as ILC tuner in Japan and now working stably at KEK-STF cryomodule. Frequency is tuned coarsely by slide jack mechanism and finely by piezo. The purpose of this study is to evaluate performance of the tuner as ERL tuner. In this report, we evaluated basic performance in normal temperature at first step. We conducted experiment with slide-jack mechanism and piezo in normal temperature. The result shows that slide-jack mechanism and piezo have enough stroke and accuracy even to take degradation caused by low-temperature into consideration. In this report, we confirmed that this tuner works well in normal temperature. The next step is to conduct experiment in low temperature.
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Slides WG3023 [0.869 MB]
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WG3026 |
Development of Antenna-type HOM Couplers at BNL |
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- S.A. Belomestnykh
BNL, Upton, Long Island, New York, USA
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Antenna-type HOM coupler are being developed at BNL for future ERLs of eRHIC. The couplers use high pass filters to prevent unwanted loading of the fundamental mode. Two designs are under considerations: one employing coaxial-line-based filter and one employing a waveguide filter. We will report results of recent simulations.
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Slides WG3026 [1.212 MB]
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WG3027 |
Power Challenge for SuperKEKB |
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- Y. Morita
KEK, Ibaraki, Japan
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Eight superconducting accelerating cavities for the KEKB accelerator will be used to accelerate electron beams in the upgraded accelerator, SuperKEKB. Designed electron beam current of the SuperKEKB is 2.6 A. The current is twice as large as that accelerated in the KEKB. One of the serious issues for high current acceleration is large HOM power produced by the beam. Expected HOM power per cavity is more than 30 kW. To absorb the HOM power sufficiently, development of new HOM damper is ongoing. We will present current status of the HOM damper R&D for SuperKEKB.
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Slides WG3027 [1.200 MB]
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WG3028 |
HOM Absorbers Using SiC Ceramics for KEKB Normal Conducting Cavity |
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- Y. Takeuchi
KEK, Ibaraki, Japan
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KEKB normal conducting cavities are equipped with 2 types of HOM absorbers using SiC ceramics and have been operated successfully over 10 years. One type of these absorbers is waveguide HOM load with bullet shape SiC ceramics and the other is grooved beam pipe type HOM load with SiC tiles. The structures of these HOM loads can be considered as a waveguide partially filled with dielectric material. Therefore the properties of the surface wave modes affect the performance of the absorber strongly. The properties of the surface wave modes in the waveguide HOM load are shown. RF dielectric properties of the SiC ceramics are essential to design HOM absorbers. In this talk, the RF dielectric properties of the SiC ceramics and control of the properties are also discussed.
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Slides WG3028 [5.523 MB]
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WG3031 |
Fundamental Power Couplers for the ERL Prototype SRF Gun at BNL |
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- S.A. Belomestnykh
BNL, Upton, Long Island, New York, USA
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A coaxial antenna 500-kW CW FPCs were developed for the SRF gun of the ERL prototype. Track3P code was used for simulations of multipacting, producing results that are in excellent agreement with zones later observed experimentally. We will report results of simulations and conditioning of FPCs.
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Slides WG3031 [1.683 MB]
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| WG3036 |
Improved Heat Conduction Feedthroughs for HOM Couplers at DESY |
102 |
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- J.K. Sekutowicz
DESY, Hamburg, Germany
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Vertical acceptance test of 808 cavities of the XFEL superconducting linac will be conducted for cavities equipped with HOM antennae, mainly to reduce the production and preparation cost. This new procedure is different from that we applied to all superconducting cavities tested in last two decades at DESY. In addition, cw and long pulse operations can be envisioned as complementary modes to the nominal short pulse operation of the XFEL facility. The new vertical test conditions and the new possible operation modes will require better cooling of the HOM couplers. In this contribution we discuss new heating conditions of the HOM antennae and present new feedthrough we ordered for the XFEL cavities.
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Slides WG3036 [1.677 MB]
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WG3037 |
Progress of SC Cavity for KEK-ERL since 2009 |
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- T. Furuya
KEK, Ibaraki, Japan
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Slides WG3037 [2.883 MB]
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WG3038 |
HZB: SRF Cavities at Peking University |
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- K.X. Liu
PKU, Beijing, People's Republic of China
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Slides WG3038 [5.028 MB]
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WG3039 |
Cornell SRF Overview |
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- G.H. Hoffstaetter
CLASSE, Ithaca, New York, USA
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Slides WG3039 [8.622 MB]
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WG3040 |
SC Superconducting RF Activities in IHEP |
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- J.Y. Zhai
IHEP Beijing, Beijing, People's Republic of China
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Slides WG3040 [7.690 MB]
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WG3041 |
Cornell ERL's Main Linac Cavities |
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- N.R.A. Valles
CLASSE, Ithaca, New York, USA
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WG3042 |
Development of Main Linac Cavity for cERL Project |
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- K. Umemori
KEK, Ibaraki, Japan
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Slides WG3042 [1.600 MB]
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WG3043 |
Vertical Test Diagnostics and Simulation Studies for 9-cell cERL Cavities |
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- E. Cenni
Sokendai, Ibaraki, Japan
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Slides WG3043 [2.351 MB]
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WG3044 |
Experience with the Cornell ERL Injector SRF Cryomodule during High Beam Current Operation |
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- M. Liepe
CLASSE, Ithaca, New York, USA
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Slides WG3044 [4.113 MB]
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WG3045 |
2K Cryogenic System Design for cERL at KEK |
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- K. Hosoyama
KEK, Ibaraki, Japan
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Slides WG3045 [1.689 MB]
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WG3046 |
Tuner Performance in S1-G Cryomodule |
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- E. Kako
KEK, Ibaraki, Japan
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Slides WG3046 [3.013 MB]
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WG3047 |
RF Power Sources for ERLs |
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- W. Anders
HZB, Berlin, Germany
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Slides WG3047 [2.378 MB]
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WG3048 |
RF Source for cERL in KEK |
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- S. Fukuda
KEK, Ibaraki, Japan
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Slides WG3048 [2.258 MB]
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WG3049 |
HOM Beamline Absorber and RF Input Coupler for the Cornell ERL Main Linac |
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- M. Liepe
CLASSE, Ithaca, New York, USA
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Slides WG3049 [1.663 MB]
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WG3050 |
BBU Simulation using HOM Randomization for Application of TESLA-like Cavity to KEK-ERL |
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- Y. Yamamoto
KEK, Ibaraki, Japan
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Slides WG3050 [0.868 MB]
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WG3051 |
Construction of Cavity Fabrication Facility in KEK |
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- H. Hayano
KEK, Ibaraki, Japan
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Slides WG3051 [2.667 MB]
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WG3052 |
High Power Input Couplers for cERL Injector |
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- E. Kako
KEK, Ibaraki, Japan
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Slides WG3052 [3.275 MB]
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WG3053 |
Injector Cryomodule for cERL at KEK |
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- S. Noguchi
KEK, Ibaraki, Japan
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Slides WG3053 [3.295 MB]
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WG3054 |
Cryomodule of KEK-ML Cavity |
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- T. Furuya
KEK, Ibaraki, Japan
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Slides WG3054 [0.823 MB]
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WG3055 |
Magnetic Shield Materials |
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- M. Masuzawa
KEK, Ibaraki, Japan
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Slides WG3055 [0.831 MB]
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| PSP021 |
Design of ERL Spoke Cavity for Non-destructive Assay Research |
140 |
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- M. Sawamura
JAEA/ERL, Ibaraki, Japan
- R. Hajima, R. Nagai, N. Nishimori
JAEA, Ibaraki-ken, Japan
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We are proposing non-destructive assay system of nuclear materials with laser Compton scattering combined with an energy-recovery linac and a laser. To construct this system for nuclear safeguards and security purpose, it is important to make the accelerating cavity small. The spoke cavity has advantages over the elliptical cavity to adopt for our proposing system. We are designing a spoke cavity favorable to compact cavity. Design optimization calculation of the spoke cavity shape is being carried out using 3D electro-magnetic field simulation code with multi-objective genetic algorithm. The results will be presented.
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