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| FROBC01 |
30 GHz High-Gradient Accelerating Structure Test Results
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3818 |
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- J. A. Rodriguez
- H. Aksakal, Z. Nergiz
Ankara University, Faculty of Sciences, Tandogan/Ankara
- G. Arnau-Izquierdo, R. Corsini, S. Doebert, R. Fandos, A. Grudiev, I. Syratchev, M. Taborelli, F. Tecker, P. Urschutz, W. Wuensch
CERN, Geneva
- M. A. Johnson
UU/ISV, Uppsala
- O. M. Mete
Ankara University, Faculty of Engineering, Tandogan, Ankara
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The CLIC study is high power testing accelerating structures in a number of different materials and accelerating structure designs to understand the physics of breakdown, determine the appropriate scaling of performance and in particular to find ways to increase achievable accelerating gradient. The most recent 30 GHz structures which have been tested include damped structures in copper, molybdenum, titanium and aluminum. The results from these new structures are presented and compared to previous ones to determine dependencies of quantities such as achievable accelerating gradient, pulse length, power flow, conditioning rate and breakdown rate.
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| FROBC02 |
RF Structures for Linac4
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3821 |
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- F. Gerigk
- N. Alharbi, M. Pasini, S. Ramberger, M. Vretenar, R. Wegner
CERN, Geneva
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Linac4 is proposed to replace the existing proton linac at CERN (Linac2). Using an increased injection energy of 160 MeV instead of 50 MeV Linac4 is expected to double the beam intensity in the PS Booster and will thus be the first step towards higher brightness beams in the LHC. In this paper we re-assess the choice of RF structures for Linac4. Different accelerating structures for different energy ranges are compared in terms of RF efficiency, ease of construction and alignment, necessary infrastructure, and cost. Eventually we present the final choice of structures for Linac4.
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Slides
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| FROBC03 |
Efficient Accelerating Structures for Low-Energy Light Ions
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3824 |
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- S. S. Kurennoy
- L. Rybarcyk, T. P. Wangler
LANL, Los Alamos, New Mexico
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The radio-frequency quadrupole (RFQ) accelerator is the best structure immediately after an ion source for accelerating light-ion beams with considerable currents. On the other hand, the higher-energy part of the RFQ is known to be not a very efficient accelerator. We consider alternative room-temperature RF accelerating structures for the beam velocities in the range of a few percent of the speed of light - including H-mode cavities and drift-tube linacs - and compare them with respect to their efficiency, compactness, ease of fabrication, and overall cost. Options for the beam transverse focusing in such structures are discussed. Possible applications include a compact deuteron-beam accelerator up to the energy of a few MeV for homeland defense.
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| FROBC04 |
Thermomechanical Design of Normal-Conducting Deflecting Cavities at the Advanced Photon Source for Short X-ray Pulse Generation
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3827 |
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- B. Brajuskovic
- J. T. Collins, P. K. Den Hartog, L. H. Morrison, G. J. Waldschmidt
ANL, Argonne, Illinois
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Funding: Work supported by U. S. Department of Energy, Office of Science, Office of Basic Energy Sciences, under Contract No. DE-AC02-06CH11357
A normal-conducting deflecting cavity is being designed at the Advanced Photon Source (APS) as a part of the short x-ray pulse project intended to provide users with approximately 2 picosecond x-rays. The system will use two pairs of 3-cell cavities in sectors 6ID and 7ID for the generation of the x-ray pulse in the 7ID beamline. The 3-cell cavities are designed to provide the desired beam deflection while absorbing in excess of 4 kW of power from a pulsed rf system and up to 2.6 kW in the damper system of high-order mode (HOM) and low-order mode (LOM) waveguides. Since the cavity frequency is very sensitive to thermal expansion, the cooling water system is designed so that it is able to control cavity temperature to within 0.1?C. This paper describes the optimization of the thermomechanical design of the cavity based on calculation of thermal stresses and displacement caused by the generated heat loads, and presents the design of a cooling water system required for the proper operation of the cavities.
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