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Title |
Other Keywords |
Page |
| TH2003 |
Recent Developments in Pulsed High-Power Systems
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kicker, klystron, linear-collider, collider |
541 |
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- D. E. Anderson
ORNL, Oak Ridge, Tennessee
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Pulsed power systems are inherent in any high power accelerator system. Applications include, among others, modulators for powering high power klystrons, pulsed power systems to drive linear induction accelerating cells, kicker magnet drivers for storage rings, and a wide variety of beam deflection and pulsed focusing systems. As with many enabling technologies, component limitations and materials properties dominate the engineering tradeoffs that must be made during the system design. An overview of the state-of-the-art in major components of pulsed power systems will be presented. An examination of how those components are being integrated into linac systems will also be performed and an overview of these systems shall be given. The relatively recent shift toward solid-state power electronics solutions to pulsed power engineering problems will be emphasized. Finally, some future trends in the field will be examined.
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| THP031 |
Pulse Cables For XFEL Modulators
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klystron, impedance, simulation, radiation |
640 |
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- H.-J. Eckoldt
DESY, Hamburg
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For the XFEL, housed in a single tunnel, most of the modulators will be placed in a central modulator building outside of the tunnel. The pulse transformers and the klystrons will be positioned inside the tunnel near the superconducting linac. Therefore the energy has to be transported via pulse cables. These cables have lengths between 350m and 1.7 km. The power is up to 16.8 MW per pulse with a repetition rate of 10 Hz. In order to keep the rise time short and match the klystron impedance four 25Ohm cables will be put in parallel. A tri-axial design was chosen to prevent magnetic field outside of the cables in order not to disturb electronics or electron beam. A prototype of the cable was produced in industry and delivered to DESY. A set of four 1.5km long parallel cables is in test at present at one of the modulators of the TTF/VUV-FEL at DESY. The cable design criteria and test results are presented in this paper.
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| THP056 |
Design of 325-MHz Single and Triple Spoke Resonators at FNAL
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linac, proton, vacuum, target |
707 |
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- I. G. Gonin, G. Apollinari, T. K. Khabiboulline, G. Lanfranco, G. Romanov
Fermilab, Batavia, Illinois
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We present the design of two 325 MHz superconducting single spoke resonators at β=0.22 and β=0.4 and a 325 MHz superconducting triple spoke resonator at β=0.62 for the front end of a 2 MW proton linac. We describe the optimization of the spoke resonator electromagnetic performance and how the resonator structural integrity and shape is ensured. We describe the mechanical design of the slow tuner mechanism and, via a coupled ANSYS-MWS analysis, how the mechanism adjusts the resonator operating frequency. The RF design of the power coupler is also presented
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| THP061 |
High Field Test Results of Superconducting 3.9-GHz Accelerating Cavities at FNAL
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simulation, resonance, pick-up, linac |
722 |
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- N. Solyak, H. Edwards, M. Foley, I. G. Gonin, T. K. Khabiboulline, D. V. Mitchell, A. M. Rowe
Fermilab, Batavia, Illinois
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The XFEL facilities are planning to use section with a few third harmonic cavities (3.9GHz) to improve beam performance [1]. Fermilab is developing superconducting third harmonic section for the FLASH(TTF/DESY) upgrade. This section will include four cavities equiped with couplers and blade tuners installed in cryostat. Up to now, two cavities are completed and one of them is under vertical test. The gradient of the cavity was limited by multipactor in HOM coupler. The visual inspection of the HOM couplers after cold tests showed that both couplers were damaged. In paper we discuss the results of vertical tests, multipactoring analysis in HOM coupler and a new design for HOM coupler.
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