| Paper |
Title |
Other Keywords |
Page |
| MOPLT062 |
The Design of a Prototype RF Compressor for High Brightness Electron Beams
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electron, bunching, extraction, injection |
698 |
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- D. Giove, F. Alessandria, A. Bacci, C. De Martinis, M. Mauri
INFN/LASA, Segrate (MI)
- D. Alesini, M. Ferrario, A. Gallo, F. Marcellini
INFN/LNF, Frascati (Roma)
- L. Serafini
INFN-Milano, Milano
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The generation of sub-ps electron bunches with low transverse emittance at nC charge level is a crucial requirement in the design of injectors for short wavelength FEL's. The technique of velocity bunching has been by now experimentally proven in various laboratories, where bunches below the ps bunch length were obtained: however, preservation of a low transverse emittance after the bunch compression is still to be demonstrated. To this aim, the use a slow wave RF structure as a rectilinear compressor has been proposed in the past to overcome the inherent difficulties of magnetic compressors. In this paper we will review the work carried out in the last 2 years and focused on the design a RF compressor based on a 3 GHz slow-wave copper structure. The rationale of the conceptual design along with a description of the main experimental activities will be presented and the future application of such a scheme to the SPARC project will be discussed.
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| MOPLT119 |
Fabrication of X-band Accelerating Structures at FERMILAB
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vacuum, factory, alignment, simulation |
815 |
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- T.T. Arkan, C. Boffo, E. Borissov, H. Carter, D. Finley, I. Gonin, T. Khabibouline, S.C. Mishra, G. Romanov, N. Solyak
Fermilab, Batavia, Illinois
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The RF Technology Development group at Fermilab is working together with the NLC and GLC groups at SLAC and KEK on developing technology for room temperature X-band accelerating structures for a future linear collider. We built seven 60cm long, high phase advance, detuned structures (HDS or FXB series). These structures have 150 degrees phase advance per cell, and are intended for high gradient tests. The structures were brazed in a vacuum furnace with a partial pressure of argon, rather than in a hydrogen atmosphere. We have also begun to build 60cm long, damped and detuned structures (HDDS or FXC / FXD series). So far, we have built 3 FXC structures. Our goal is to build 4 FXC and 2 FXD structures for the 8-pack test at SLAC by the end of March 2004, as part of the GLC/NLC effort to demonstrate the readiness of room temperature RF technology for a linear collider. This poster describes the RF structure factory infrastructure (clean rooms, vacuum furnaces, vacuum equipment, RF equipment etc.), and the fabrication techniques utilized (the machining of copper cells / couplers, quality control, etching, vacuum brazing, cleanliness requirements etc.) for the production of FXB and FXC structures.
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| MOPLT121 |
Water Flow Vibration Effect on the NLC RF Structure-girder System
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linac, quadrupole, simulation, coupling |
821 |
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- C. Boffo, T.T. Arkan, E. Borissov, H. Carter
Fermilab, Batavia, Illinois
- F. Le Pimpec, A. Seryi
SLAC, Menlo Park, California
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In order to meet the vibration budget for the Next Linear Collider main Linac components, the vibration sources in the NLC girder are being studied. The activity is focused on the vibration induced by the cooling water flow for the 60 cm long accelerating copper structures. Understanding the vibration in the structures will enable us to push forward the design of the interface between the structures and the quadrupoles. This paper reports on the ongoing work and presents results from experimental data as well as finite element simulations.
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| TUPKF004 |
First Results with a Fast Phase and Amplitude Modulator for High Power RF Application
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linac, proton, klystron, simulation |
959 |
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- D. Valuch, H. Frischholz, J. Tuckmantel
CERN, Geneva
- C. Weil
AFT, Backnang
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In a high energy and high power superconducting proton linac, it is more economical to drive several cavities with a single high power transmitter rather than to use one transmitter per cavity. This option has however the disadvantage of not permitting to individually control each cavity, which potentially leads to instabilities. Provided that it can be built at a reasonable cost, a fast phase & amplitude modulator inserted into each cavity feeder line can provide the necessary control capability. A prototype of such a device has been built, based on two fast and compact high power RF phase-shifters, magnetically biased by external coils. The design is described, together with the results obtained at high and low power levels.
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| TUPKF007 |
Series Fabrication Technologies for Normalconducting Linac and Storage Ring Cavities
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vacuum, linac, alignment, coupling |
968 |
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- P. vom Stein, K. Dunkel, B. Griep, C. Piel, H.P. Vogel
ACCEL, Bergisch Gladbach
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Twelve HOM damped 476 MHz single cell cavities have been delivered for PEP II and the production of several 805 MHz CCL modules for SNS has recently been finalised by ACCEL Instruments. Based on those two examples, required key technologies for cavity production will be introduced. Final prove of successful manufacturing is given by low level rf measurements. Results of those measurements for above mentioned projects will be presented within this paper.
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| THPKF066 |
Conception of X-ray Source Based on Compact Wakefield Undulator
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radiation, photon, electron, undulator |
2415 |
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- A. Opanasenko
NSC/KIPT, Kharkov
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Study of interaction of bunched charged ultrarelativistic particles with own wakefields in periodic rf structures detects new applications in the area of accelerator physics and technology. Conception of monochromatic X-ray source based on wakefield undulator, WFU, with very short period is presented. In the base of photon generation by the WFU lies a new mechanism of undulator-type radiation emitted by an ultrarelativistic electron bunch that undulates due to non-synchronous spatial harmonics of its wakefields while the bunch moves along a periodic waveguide. The features of the hard radiation and yield of photons depending on waveguide sizes and charge distribution are considered. The creation of the WFU with sub-millimetre periods due to advanced accelerator technology, such as deep X-ray lithography, opens possibilities to obtain high brightness X-rays at employing comparatively low electron energies without external alternative fields. That can have commercial significance for technological and medical applications.
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