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TUXA2 |
Nanometer Beam Generation and Measurements in KEK-ATF2 |
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- G.R. White
SLAC, Menlo Park, California, USA
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Techiques for generation and measurements of ultra small beams in the few nanmeter range for applications in the final focus of high energy linear colliders are being developped and tested in the KEK ATF2. After reviewing the presently achieved performances and their possible progress in the future, the presentation should outline the basic limitations and realistic figures for application in future facilities.
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Slides TUXA2 [9.837 MB]
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| TUPBA25 |
Design and High Order Optimization of the ATF2 Lattices |
574 |
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- E. Marín, G.R. White, M. Woodley
SLAC, Menlo Park, California, USA
- K. Kubo, T. Okugi, T. Tauchi, J. Urakawa
KEK, Ibaraki, Japan
- R. Tomás
CERN, Geneva, Switzerland
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Funding: Work supported in part by Department of Energy Contract DE-AC02-76SF00515
The next generation of future linear colliders (LC) demands nano-meter beam sizes at the interaction point (IP) in order to reach the required luminosity. The final focus system (FFS) of a LC is meant to deliver such small beam sizes. The Accelerator Test Facility (ATF) aims to test the feasibility of the new local chromaticity correction scheme which the future LCs are based on. To this end the ATF2 nominal and ultra-low β* lattices are design to vertically focus the beam at the IP to 37nm and 23nm, respectively if error-free lattices are considered. However simulations show that the measured field errors of the ATF2 magnets preclude to reach the mentioned spot sizes. This paper describes the optimization of high order aberrations of the ATF2 lattices in order to minimize the detrimental effect of the measured multipole components for both ATF2 lattices. Specifically three solutions are studied, the replacement of the last focusing quadrupole (QF1FF), insertion of octupole magnets and optics modification. By applying the mentioned cures the design vertical beam size at the IP is almost recovered for both ATF2 lattices.
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| THYAA2 |
Latest Plasma Wakefield Acceleration Results from the FACET Project |
1101 |
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- M.D. Litos, E. Adli, C.I. Clarke, S. Corde, J.-P. Delahaye, R.J. England, A.S. Fisher, J.T. Frederico, S.J. Gessner, M.J. Hogan, S.Z. Li, D.R. Walz, G.R. White, Z. Wu, V. Yakimenko
SLAC, Menlo Park, California, USA
- E. Adli
University of Oslo, Oslo, Norway
- W. An, C.E. Clayton, C. Joshi, W. Lu, K.A. Marsh, W.B. Mori, N. Vafaei-Najafabadi
UCLA, Los Angeles, California, USA
- P. Muggli
MPI, Muenchen, Germany
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SLAC’s new FACET facility had its second user run in April–June, 2013. Several new milestones were reached during this run, including the achievement of beam driven plasma wakefield acceleration of a discrete witness bunch for the first time, and energy doubling in a noble gas plasma source. The FACET beam is a 20 GeV electron bunch with a charge of 3.2 nC that can be compressed and focused to a size of 20 μm × 20 μm × 20 μm rms. To create the two-bunch, drive/witness beam structure, a chirped and over-compressed beam was dispersed horizontally in a chicane and a bite was taken from its middle with a tantalum finger collimator, corresponding to a longitudinal notching of the beam due to the head-tail energy correlation. A new 10 terawatt Ti:Sapphire laser was commissioned and used during this run to pre-ionize the plasma source in order to increase the efficiency of energy transfer from the beam to the wake. Ultimately, a witness beam of hundreds of pC in charge was accelerated by a drive beam of similar charge in a pre-formed lithium plasma with a density of 5×1016 cm−3, experiencing gradients reaching several GeV/m in magnitude.
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Slides THYAA2 [22.217 MB]
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