Theoretical motivation of indented-anode diode for HERMES III
HERMES III is an accelerator being designed as a uniform source of flash ..gamma..-rays. Diode designs are needed that efficiently convert electrical energy to ..gamma..-ray energy and that distribute that ..gamma..-ray energy uniformly over a large area. Code simulations of coaxial diode designs show that the electron beam in the anode-cathode gap forms a weak pinch, which results in excessive on-axis radiation. In this report, a diode concept is developed that can reduce the pinch at the anode converter and thus can improve the uniformity of the radiation. This concept employs an indentation in the anode to passively control the beam. For this diode, electron flow, impedance models, and scaling laws of the diode behavior as a function of the geometric parameters of the diode, voltage, and current are developed. We evaluate the subsequent radiation output and improvement in radiation uniformity relative to diodes with planar anodes. The analysis shows that not only is the indented-anode capable of significantly improving radiation uniformity, but that it is also capable of reducing the width of the radiation pulse.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (USA)
- DOE Contract Number:
- AC04-76DP00789
- OSTI ID:
- 6850847
- Report Number(s):
- SAND-85-2383; ON: DE87005736
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
430303* -- Particle Accelerators-- Experimental Facilities & Equipment
ACCELERATORS
ANODES
BEAMS
COMPUTERIZED SIMULATION
DESIGN
DIODE TUBES
DOSES
ELECTRIC IMPEDANCE
ELECTRODES
ELECTRON BEAMS
ELECTRON TUBES
GAMMA SOURCES
IMPEDANCE
LEPTON BEAMS
PARTICLE BEAMS
RADIATION DOSES
RADIATION SOURCES
SIMULATION