| Paper |
Title |
Page |
| THOBKI01 |
Development of a Movable Collimator with Low Beam Impedance
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2587 |
| |
- Y. Suetsugu
- K. Shibata
KEK, Ibaraki
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A movable collimator (mask) with low beam impedance was proposed for high-intensity accelerators. The collimator head is supported by a ceramic rod with a thin metal coating, instead of a metal block or rod so far. Owing to the ceramic rod, beams hardly see the head, and thus the beam impedance decreases. The thin metal coating prevents the head from unwanted charge up. The head is also made of ceramic, but coated by copper to mitigate the Joule heating by beams. The SiC blocks are prepared close to the head to absorb trapped modes. Impedances and loss factors were calculated by simulation codes, and then the growth rates of coupled bunch instabilities were estimated. A trial model was designed based on the calculation, and installed in the KEK B-factory (KEKB) positron ring. The head had a cross section of 5 mm X 4 mm, and a length of 90 mm, which corresponded to about one radiation length. The performance of the trial model was investigated with beams. The temperatures of components near to the collimator were also measured, which was an indication of the intensity of excited HOM.
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Slides
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| THOBKI02 |
Marx Bank Technology for the International Linear Collider
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2590 |
| |
- M. A. Kempkes
- F. O. Arntz, J. A. Casey, M. P.J. Gaudreau, I. Roth
Diversified Technologies, Inc., Bedford, Massachusetts
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In August, 2004, the international science community formally backed the development of a superconducting linear accelerator named the International Linear Collider (ILC). It is expected that the accelerator will employ klystrons operating in the range of 110-135 kV, 120-166 A, and 1.5 ms pulsewidth. Due to the accelerator's long pulse length and high power, focusing on power supply and energy storage alternatives promises to yield significant reductions in acquisition costs. Diversified Technologies, Inc. (DTI) has developed a high power, solid-state Marx Bank topology, offering an optimal, silicon-efficient technology for the ILC modulators and power supplies. We estimate the Marx topology can deliver equivalent performance and yield acquisition cost savings of 25-50% versus presently proposed alternatives. In this paper DTI will describe the Marx based technology as it is applied to ILC power systems design, and review recent progress in the engineering of the prototype transmitter.
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