| Paper |
Title |
Page |
| MOP82 |
SRF Cavity and Materials R&D at Fermilab
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213 |
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- N. Khabiboulline, P. Bauer, L. Bellantoni, T. Berenc, C. Boffo, R. Carcagno, C. Chapman, H. Edwards, L. Elementi, M. Foley, E. Hahn, D. Hicks, D. Mitchell, A. Rowe, N. Solyak, I. Terechkine
FNAL, Batavia, Illinois
- A. Gurevich, M. Jewell, D. C. Larbalestier, P. Lee, A. Polyanskii, A. Squitieri
UW-Madison/ASC, Madison, Wisconsin
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Two 3.9 GHz superconducting RF cavities are under development at FNAL for use in the upgraded Photoinjector Facility. A TM110 mode cavity will provide streak capability for bunch slice diagnostics, and a TM010 mode cavity will provide linearization of the accelerating gradient before compression for better emittance. The status of these two efforts and a review of the FNAL infrastructure development will be given.
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| THP83 |
Measurements of High Order Modes in High Phase Advance Damped Detuned Accelerating Structure for NLC
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791 |
| |
- N. Khabiboulline, T. Arkan, H. Carter
FNAL, Batavia, Illinois
- G. Linder
University of Illinois at Urbana-Champaign, Urbana, Illinois
- G. Romanov
Fermilab, Batavia, Illinois
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The RF Technology Development group at Fermilab is working together with the NLC and JLC groups at SLAC and KEK on developing technology for room temperature X-band accelerating structures for a future linear collider. We have built several series of structures for high gradient tests. We have also built 150° phase advance per cell, 60 cm long, damped and detuned structures (HDDS or FXC series). Some of these structures will be used for the 8-pack test at SLAC by the end of 2004, as part of the JLC/NLC effort to demonstrate the readiness of room temperature RF technology for a linear collider. HDSS structures are very close to the final design for the linear collider, and it was very interesting to study the properties of high order modes in the structures produced by semi-industrial methods. In this study advanced RF technique and methods developed at Fermilab for structure low power testing and tuning have been used. The results of these measurements are presented in this paper.
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| THP85 |
Test Results of the 3.9 GHz Cavity at Fermilab
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797 |
| |
- N. Solyak, I. Gonin
Fermilab, Batavia, Illinois
- L. Bellantoni, T. Berenc, H. Edwards, M. Foley, N. Khabiboulline, D. Mitchell, A. Rowe
FNAL, Batavia, Illinois
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Fermilab is developing two types of 3.9 GHz superconducting cavities to improve performances of A0 and TTF photoinjectors. In frame of this project we have built and tested two nine-cell copper models and one 3-cell niobium accelertating cavity and series of deflecting cavities. Properties of the high order modes were carefully studied in a chain of two copper cavities at room temperature. High gradient performance were tested at helium temperature. Achieved gradients and surface resistances are exceed goal parameters. In paper we discuss results of cold tests of the 3-cell accelerating and deflecting cavities.
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| THP33 |
Progress toward NLC/GLC Prototype Accelerator Structures
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675 |
| |
- J. Wang, G. Bowden, V.A. Dolgashev, R.M. Jones, J. Lewandowski, C.D. Nantista, S.G. Tantawi
SLAC/ARDA, Menlo Park, California
- C. Adolphsen, D.L. Burke, J.Q. Chan, J. Cornuelle, S. Döbert
SLAC/NLC, Menlo Park, California
- T. Arkan, C. Boffo, H. Carter, N. Khabiboulline
FNAL, Batavia, Illinois
- N. Baboi
DESY, Hamburg
- D. Finley, I. Gonin, S. Mishra, G. Romanov, N. Solyak
Fermilab, Batavia, Illinois
- Y. Higashi, T. Higo, T. Kumi, Y. Morozumi, N. Toge, K. Ueno
KEK, Ibaraki
- Z. Li, R. Miller, C. Pearson, R.D. Ruth, P.B. Wilson, L. Xiao
SLAC, Menlo Park, California
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The accelerator structure groups for NLC (Next Linear Collider) and GLC (Global Linear Colliders) have successfully collaborated on the research and development of a major series of advanced accelerator structures based on room-temperature technology at X-band frequency. The progress in design, simulation, microwave measurement and high gradient tests are summarized in this paper. The recent effort in design and fabrication of the accelerator structure prototype for the main linac is presented in detail including HOM (High Order Mode) suppression and couplers, fundamental mode couplers, optimized accelerator cavities as well as plans for future structures. We emphasize techniques to reduce the field on the surface of the copper structures (in order to achieve high accelerating gradients), limit the dipole wakefields (to relax alignment tolerance and prevent a beam break up instability) and improve shunt impedance (to reduce the RF power required).
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