| Paper | Title | Page |
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| TPPE038 | Thermal Hydraulic Design of PWT Accelerating Structures | 2524 |
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Funding: Work supported by DOE SBIR Grant No. DE-FG02-03ER83846. Microwave power losses on the surfaces of accelerating structures will transform to heat which will deform the structures if it is not removed in time. Thermal hydraulic design of the disk and cooling rods of a Plane Wave Transformer (PWT) structure is presented. Experiments to measure the hydraulic (pressure vs flow rate) and cooling (heat removed vs flow rate) properties of the PWT disk are performed, and results compared with simulations using Mathcad models and the COSMOSM code. Both experimental and simulation results showed that the heat deposited on the structure could be removed effectively using specially designed water-cooling circuits and the temperature of the structure could be controlled within the range required. |
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| TPPE066 | Geometry Optimization of DC/RF Photoelectron Gun | 3679 |
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Funding: *Work supported by DOE SBIR Grant No. DE-FG02-03ER83878. Pre-acceleration of photoelectrons in a pulsed, high voltage, short, dc gap and its subsequent injection into an rf gun is a promising method to improve electron beam emittance in rf accelerators. Simulation work has been performed in order to optimize the geometric shapes of a dc/rf gun and improve electron beam properties. Variations were made on cathode and anode shapes, dc gap distance, and inlet shape of the rf cavity. Simulations showed that significant improvement on the normalized emittance (< 1 mm-mrad), compared to a dc gun with flat cathode, could be obtained after the geometric shapes of the gun were optimized. |
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| TPPT050 | Rod-Loaded and PBG Multi-Beam Klystron Cavities | 3094 |
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Funding: Work supported by DOE SBIR Grant No. DE-FG02-03ER83845. Performance of PBG-like structures was studied for multi-defect and single-defect metal cavities. Conceptual designs of a 6-beam, X-band, multi-beam klystron (MBK) demonstrate feasibility of high power generation with efficiency ~63% in a compact structure. Sheet-beam and annular-beam rod-loaded configurations were also investigated. |
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| WPAT081 | Ceramic Power Extractor Design at 15.6 GHz | 4078 |
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Funding: Work supported by DOE SBIR Grant No. DE-FG03-01ER83232. Power extractor and coupler designs developed for an experiment planned at the 12th beam harmonic of the upgraded Advanced Wakefield Accelerator (AWA) facility is described. New features are an upstream HOM dielectric damper with additional tapering, and a single-port coupler considered in two variants. Performance analysis includes coupler geometric tolerances, overvoltage, dipole mode wake and BBU; and wakefield losses induced in the damper. |
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| RPPP046 | An L-Band Polarized Electron PWT Photoinjector for the International Linear Collider (ILC) | 2902 |
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Funding: Work supported by DOE SBIR Grant No. DE-FG02-03ER83846. A multi-cell, standing-wave, L-band, p-mode, plane-wave-transformer (PWT) photoinjector with an integrated photocathode in a novel linac structure is proposed by DULY Research Inc. as a polarized electron source. The PWT photoinjector is capable of operation in ultra high vacuum and moderate field gradient. Expected performance of an L-band polarized electron PWT injector operating under the parameters for the International Linear Collider is presented. The projected normalized transverse rms emittance is an order of magnitude lower than that produced with a polarized electron dc gun followed by subharmonic bunchers. |