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| FROBS1 |
World-wide Experience with SRF Facilities |
2575 |
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- A. Hutton, A. Carpenter
JLAB, Newport News, Virginia, USA
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The speaker will review and analyze the performance of existing SRF facilities in the world, addressing issues of usage and availability for different customers (HEP research, material sciences, ADS). Lessons learned should be summarized for proposed future facilities (ILC, ProjectX, Muon Collider).
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Slides FROBS1 [5.473 MB]
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FROBS2 |
RF Systems for Superconducting Linacs |
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- W. Anders
HZB, Berlin, Germany
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The high-power RF system for superconducting Linacs impacts the performance of the machine and represents a significant fraction of the capital investment. Different options for various applications are being developed, from traditional klystrons to IOTs to, more recently, solid-state amplifiers, whose costs are dropping to acceptable levels. The speaker will present an overview of these systems, their respective advantages and disadvantages, reliability, efficiency and achieved performance.
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Slides FROBS2 [10.969 MB]
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| FROBS3 |
Progress on Superconducting RF for the Cornell Energy-Recovery-Linac |
2580 |
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- M. Liepe, G.H. Hoffstaetter, S. Posen, J. Sears, V.D. Shemelin, M. Tigner, N.R.A. Valles, V. Veshcherevich
CLASSE, Ithaca, New York, USA
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Cornell University is developing the superconducting RF technology required for the construction of a 5 GeV, 100 mA light source driven by an energy-recovery linac. Currently, a 100 mA injector cryomodule is under extensive testing and prototypes of the components of the SRF main linac cryomodule are under development, fabrication and testing. In this paper we give an overview of these recent activities at Cornell.
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Slides FROBS3 [10.577 MB]
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| FROBS4 |
NSLS-II RF Systems |
2583 |
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- J. Rose, W.K. Gash, B. Holub, Y. Kawashima, H. Ma, N.A. Towne, M. Yeddulla
BNL, Upton, Long Island, New York, USA
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The NSLS-II RF systems include solid state modulators for the S-band klystrons powering the traveling wave sections for the 200 MeV injector linac, 7 cell cavity with IOT amplifier for the 3 GeV booster synchrotron and superconducting 500 MHz cavities powered by klystrons and a passive 1500 MHz SRF cavity for the 3 GeV, 500 mA storage ring. The systems are controlled by digital I/Q modulators fed by an ultra-low noise master oscillator. System overviews will be given along with preliminary test data.
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Slides FROBS4 [1.041 MB]
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| FROBS5 |
1.3 GHz Superconducting RF Cavity Program at Fermilab |
2586 |
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- C.M. Ginsburg, T.T. Arkan, S. Barbanotti, H. Carter, M.S. Champion, L.D. Cooley, C.A. Cooper, M.H. Foley, M. Ge, C.J. Grimm, E.R. Harms, A. Hocker, R.D. Kephart, T.N. Khabiboulline, J.R. Leibfritz, A. Lunin, J.P. Ozelis, Y.M. Pischalnikov, A.M. Rowe, W. Schappert, D.A. Sergatskov, A.I. Sukhanov, G. Wu
Fermilab, Batavia, USA
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Funding: Work supported by Fermi Research Alliance, LLC under contract DE-AC02-07CH11359 with the U.S. Department of Energy.
At Fermilab, 9-cell 1.3 GHz superconducting RF (SRF) cavities are prepared, qualified, and assembled into cryomodules, for Project X, an International Linear Collider, or other future projects. The 1.3 GHz SRF cavity program includes targeted R&D on 1-cell 1.3 GHz cavities for cavity performance improvement. Production cavity qualification includes cavity inspection, surface processing, clean assembly, and one or more cryogenic low-power CW qualification tests which typically include performance diagnostics. Qualified cavities are welded into helium vessels and are cryogenically tested with pulsed high-power. Well performing cavities are assembled into cryomodules for pulsed high-power testing in a cryomodule test facility, and possible installation into a beamline. The overall goals of the 1.3 GHz SRF cavity program, supporting facilities, and accomplishments are described.
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Slides FROBS5 [3.749 MB]
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| FROBS6 |
High Current SRF Cavity Design for SPL and eRHIC |
2589 |
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- W. Xu, I. Ben-Zvi, R. Calaga, H. Hahn, E.C. Johnson, J. Kewisch
BNL, Upton, Long Island, New York, USA
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Funding: Work supported by Brookhaven Science Associates, LLC under Contract No. DE-AC02-98CH10886 with the U.S. Department of Energy
In order to meet the requirements of high average current accelerators, such as the Superconducting Proton Linac (SPL) at CERN and the electron–ion collider (eRHIC) at BNL, a high current 5-cell SRF cavity, called BNL3 cavity, was designed. The optimization process aimed at maximizing the R/Q of the fundamental mode and the geometry factor G under an acceptable RF field level of Bpeak/Eacc or Epeak/Eacc. In addition, a pivotal consideration for the high current accelerators is efficient damping of dangerous higher-order modes (HOM) to avoid inducing emittance degradation, cryogenic loading or beam-breakup (BBU). To transport the HOMs out of the cavity, the BNL3 cavity employs a larger beam pipe, allowing the propagation of HOMs but not the fundamental mode. Moreover, concerning the BBU effect, the BNL3 cavity is aimed at low (R/Q)Qext for dangerous modes, including dipole modes and quadrupole modes. This paper presents the design of the BNL3 cavity, including the optimization for the fundamental mode, and the BBU limitation for dipole and quadrupole modes. The BBU simulation results show that the designed cavity is qualified for high-current, multi-pass machines such as eRHIC.
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Slides FROBS6 [2.577 MB]
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