High power transit-time rf amplifier for super accelerators

Conference · Sat Dec 25 04:00:00 EST 1993 · AIP Conference Proceedings (American Institute of Physics); (United States)

OSTI ID:6708355

Arman, M J ^[1]; Sullivan, D J ^[2]

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1. Phillips Laboratory, Kirtland AFB, New Mexico 87117 (United States)
2. Mission Research Corporation, Albuquerque, New Mexico 87106 (United States)

When a charged particle beam passes axially through a cylindrical cavity, under proper conditions, it can excite and ultimately grow certain characteristic electromagnetic modes of the cavity. The effect, called transit-time effect, has been known since the 1930's. Transit-time effects can be used as an oscillator to generate microwave or as an amplifier for coherent amplification. Based on transit-time effects we have developed an rf amplifier with output power in the giga-watt range and an efficiency approaching 35%. With no foils to erode, the repetition rate can exceed 1000/sec. Furthermore, as a result of strong rf feedback on the structure, the emission into the diode gap is gated, leading to potentially very large efficiencies. In this device, called acceletron, a dc pulse is launched into a coaxial structure that is the diode, the buncher, and the oscillator all in one. Electrons are emitted from the surface of the inner conductor and as they accelerate axially towards the anode they interact with a selected characteristic mode of the structure, on the average losing kinetic energy to the mode. This process continues until the RF fields are strong enough to modify the transit time, leading to saturation. The source offers significant improvements in power, repetition rate, size, and efficiency. As is the case with all transit-time oscillators, the signal is stable and monochromatic. The device may be used as a buncher, as an oscillator, or as an amplifier. The RF may be extracted axially through a coaxial line, or radially through a radial waveguide perpendicular to the axis. The results of the numerical simulations will be presented.

• OSTI ID: 6708355
• Report Number(s): CONF-9302104--
• Conference Information: Journal Name: AIP Conference Proceedings (American Institute of Physics); (United States) Journal Volume: 297:1
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430200* -- Particle Accelerators-- Beam Dynamics
Field Calculations
& Ion Optics
ACCELERATORS
AMPLIFIERS
BEAM BUNCHING
BEAM DYNAMICS
BEAMS
EFFICIENCY
ELECTRON BEAMS
ELECTRONIC EQUIPMENT
EQUIPMENT
LEPTON BEAMS
PARTICLE BEAMS
PULSE AMPLIFIERS
RF SYSTEMS