A 100 Megavolt per Meter Electron Linear Accelerator System

50075-98-I A 100 Megavolt per Meter Electron Linear Accelerator System--Haimson Research Corporation, 3350 Scott Boulevard, Building 60, Santa Clara, CA 95054-3104; (408) 988-6007 Dr. Jacob Haimson, Principal Investigator Ms. Beverly Mecklenburg, Business Official DOE Grant No. DE-FG03-98ER82589 Amount: $73,667 Electron accelerator linear collider studies continue to explore a practical means of achieving accelerating gradients of 100 MV/m or greater, with growing interest in higher operating frequencies. High power testing of linear collider systems are presently being performed at 11.4 gigahertz in the USA and Japan, with typical accelerating gradients in the range of 30-60 MV/m. This application describes a novel 17.136 gigahertz linear accelerator system designed to achieve an accelerating gradient of 100 MV/m. The objective of Phase I is to investigate the feasibility of integrating a high gradient 17 gigahertz accelerator waveguide into the recirculating loop of a phase-locked traveling wave resonant ring. This would allow the peak power available from the klystron RF source to be multiplied four-fold, providing an accelerating gradient of 100 to 110 MV/m. During Phase II, this compact accelerator system will be fabricated and interfaced with an existing klystron and electron beam injector to evaluate the high power performance. A detailed beam optics analysis will be performed in Phase I to ensure the design parameters of the new accelerator waveguide are consistent with correct capture, compression, asymptotic location, and subsequent acceleration of injected electron bunches, for the proposed unique gradient conditions of 100 MV/m at an operating wavelength of 1.75 cm. Based on this analysis, the microwave parameters of the resonant ring and accelerator will be matched to achieve desired power buildup characteristics, design specifications of the high power ring components will be established, and a layout drawing of the system configuration will be prepared. Commercial Applications and Other Benefits as described by the awardee: It is anticipated that the Phase I and Phase II efforts will result in a compact accelerator system suitable for high gradient research and advanced accelerator applications and for evaluating 17 gigahertz linear collider technology._