RF sources for linear colliders

Abstract

Future linear colliders will require high peak power RF sources at high frequencies which are significantly beyond present source technology. Considerable progress has been made during the past several years in this direction. This paper summarizes the present state of high power RF source technology, and identifies the critical remaining technical issues.

Design and testing of a 7.8 GHz power extractor using a cylindrical dielectric-loaded waveguide

“…The TBA scheme can be broken down into three stages: (i) radio frequency (rf) power is extracted from a low-energy, high-current drive bunch by a decelerator; (ii) rf power is coupled out of the decelerator and into a transfer waveguide; and (iii) rf power is delivered into an accelerator for acceleration of the high-energy, low-current main bunch. This option may overcome some of the limitations of high-power rf generation, transfer, and pulse compression compared to a klystron-based system [4,5] at frequencies above X-band [6] and power levels beyond a couple of hundred megawatts [7]. This is due to the ease with which the rf power characteristics can be changed by manipulating the decelerator and its drive bunch.…”

High-power radio frequency pulse generation and extration based on wakefield excited by an intense charged particle beam in dielectric-loaded waveguides.

“…As shown in the figure, a typical TBA scheme consists of three stages: i) RF power is extracted from a lowenergy, high-current beam (drive beam) within decelerating sections; ii) RF power is coupled out of the decelerating sections into output waveguides; and iii) RF power is delivered into accelerating sections for acceleration of the high-energy, low-current beam (Gao 2008). This option may overcome some of the limitations of high-power RF generation, transfer, and pulse compression compared to a traditional klystron-based system (Braun 1998;Kübner 1992) at frequencies above X-band (Danly 1995) and power levels beyond a few hundred megawatts (Gai 2001). This is due to the ease with which the RF power characteristics can be changed by manipulating the decelerating sections and its drive bunch.…”