Radiation field from an extended planar-anode on HERMES III

• Published in: IEEE Transactions on Nuclear Science (Institute of Electrical and Electronics Engineers); (USA) Vol. 36:6
• Main Authors: Sanford, T.W.L., Halbleib, J.A., Poukey, J.W., Beutler, D.E., Carlson, G.A., Baldwin, G.T., Sheriden, T., Mock, R., Klinger, R.S., Knott, D.P.
• Format: Conference Proceeding
• Language: English
• Published: United States 01-12-1989
• Subjects: 360605 - Materials- Radiation Effects; 430200 - Particle Accelerators- Beam Dynamics, Field Calculations, & Ion Optics; 70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 700101 - Fusion Energy- Plasma Research- Confinement, Heating, & Production; ACCELERATORS; ANODES; BEAMS; BREMSSTRAHLUNG; COLLECTIVE ACCELERATORS; DIODE TUBES; ELECTRODES; ELECTROMAGNETIC RADIATION; ELECTRON BEAMS; ELECTRON TUBES; ELECTRON-RING ACCELERATORS; ELECTRONS; ELEMENTARY PARTICLES; FERMIONS; FIELD TESTS; GAMMA RADIATION; HARDENING; IONIZING RADIATIONS; LEPTON BEAMS; LEPTONS; MATERIALS SCIENCE; PARTICLE ACCELERATORS; PARTICLE BEAMS; PHYSICAL RADIATION EFFECTS; PLASMA PRODUCTION; RADIATION EFFECTS; RADIATION HARDENING; RADIATION SOURCES; RADIATIONS; TARGETS; TESTING; THERMIONIC DIODES; THERMIONIC TUBES; TRAJECTORIES
• ISSN: 0018-9499; 1558-1578
• DOI: 10.1109/23.45389

The bremsstrahlung field from an extended planar-anode diode with an annular cathode tip on the 16-TW HERMES III electron accelerator is measured and compared with predictions. Measurements confirm predictions and demonstrate that the diode provides a versatile large-area source of gamma radiation. Versatility is obtained by adjustment of the anode-cathode gap, which affects electron trajectories while simultaneously maintaining constant diode impedance. The adjustment permits the generation of average dose rates from about 1.2 {times} 10{sup 12} rad/s over 3100 cm{sup 2} to about 5.6 {times} 10{sup 12} rad/s over 700 cm{sup 2}, without destruction of the bremsstrahlung target.