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Title |
Page |
| MOPP128 |
Bridging the Gap Between Conventional RF Acceleration and Laser Driven Acceleration |
358 |
| MOPOL04 |
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- M.V. Fazio, V.A. Dolgashev, S.G. Tantawi
SLAC, Menlo Park, California, USA
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For decades conventional RF accelerators have been built and operated with ever increasing capability through a few tens of gigahertz in frequency. More recent research takes advantage of the continuing development of high peak power short pulse lasers to drive accelerator structures at optical frequencies. This jump from RF to optical frequencies skips four orders of magnitude in wavelength. With recent experiments that demonstrate high gradients in metallic structures at millimeter wavelengths one is compelled to consider the viability of new approaches for acceleration in the millimeter-wave to terahertz regime. This paper will explore some of these possibilities.
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TUPP124 |
Update on High Power Tests of Single Cell Standing Wave structures at SLAC |
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- V.A. Dolgashev, J.R. Lewandowski, S.G. Tantawi, S.P. Weathersby, A.D. Yeremian
SLAC, Menlo Park, California, USA
- Y. Higashi
OIST, Onna-son, Okinawa, Japan
- B. Spataro
INFN/LNF, Frascati (Roma), Italy
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Funding: This work was supported by the U.S. Department of Energy contract DE-AC02-76SF00515.
We report results of ongoing high power tests of single cell standing wave structures. These tests are part of an experimental and theoretical study of rf breakdown in normal conducting structures at 11.4 GHz. The goal of this study is to determine the accelerating gradient capability of normal-conducting rf powered particle accelerators. The test setup consists of reusable mode-launchers and short test structures powered by SLAC's XL-4 klystron. We have tested structures of different geometries, cell joining techniques, and materials, including copper structures with molybdenum and stainless steel irises. In previous experiments we found that the breakdown rate is correlated more with peak surface pulse heating than with the peak surface electric field. In recent experiments we continue study of hard cooper alloys and manufacturing techniques that avoid heat treatment of the metal. As a result we observed that cooper silver alloys show superior performance in comparison with both hard and heat treated copper.
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| THIOB03 |
Results From the LCLS X-Band Transverse Deflector With Femtosecond Temporal Resolution |
819 |
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- Y. Ding, F.-J. Decker, V.A. Dolgashev, J.C. Frisch, Z. Huang, P. Krejcik, H. Loos, A. Lutmann, A. Marinelli, T.J. Maxwell, D.F. Ratner, J.L. Turner, J.W. Wang, M.-H. Wang, J.J. Welch, J. Wu
SLAC, Menlo Park, California, USA
- C. Behrens
DESY, Hamburg, Germany
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An X-band RF transverse deflector composed of two 1-m-long X-band deflecting structures has been recently commissioned at the Linac Coherent Light Source (LCLS) at SLAC National Accelerator Laboratory. Located downstream of the FEL undulator, this device provides electron beam longitudinal phase space diagnostics in both time and energy which enables reconstruction of the X-ray FEL power profiles with an unprecedented resolution. This talk reports on the progress of this new LCLS X-band transverse deflector, first usage experience and measured results.
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Slides THIOB03 [3.508 MB]
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| THPP013 |
Prototype Development of the CLIC Crab Cavities |
856 |
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- G. Burt, P.K. Ambattu, A.C. Dexter, M. Jenkins, C. Lingwood, B.J. Woolley
Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
- V.A. Dolgashev
SLAC, Menlo Park, California, USA
- P. Goudket, P.A. McIntosh
STFC/DL/ASTeC, Daresbury, Warrington, Cheshire, United Kingdom
- A. Grudiev, G. Riddone, A. Solodko, I. Syratchev, R. Wegner, W. Wuensch
CERN, Geneva, Switzerland
- C. Hill, N. Templeton
STFC/DL, Daresbury, Warrington, Cheshire, United Kingdom
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CLIC will require two crab cavities to align the beams to provide an effective head-on collision with a 20 mdeg crossing angle at the interaction point. An X-band system has been chosen for the crab cavities. Three prototype cavities have been developed in order to test the high power characteristics of these cavities. One cavity has been made by UK industry and one has been made using the same process as the CLIC main linac in order to gain understanding of breakdown behaviour in X-band deflecting cavities. The final cavity incorporates mode-damping waveguides on each cell which will eventually contain SiC dampers. This paper details the design, manufacture and preparation of these cavities for testing and a report on their status.
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