Dose-voltage dependence for HELIA/HERMES III bremsstrahlung diodes

Conference · Wed Dec 31 23:00:00 EST 1986

OSTI ID:6727227

Sanford, T W.L.; Halbleib, J A; Poukey, J W; Heath, C E; Mock, R

The relation D ..cap alpha.. IV/sup 2.65/ is widely used to estimate the on-axis radiation dose rate, D, downstream of an optimized bremsstrahlung target as a function of diode voltage, V, for flash x-ray sources. This relation is valid only for pencil beams. For diodes having beams with finite spatial and angular extent, the power 2.65 is reduced. This reduction is evaluated via the MAGIC and CYLTRAN codes for diodes operating on the projected 20 MV HERMES III and existing 3 MV HELIA accelerators. For HERMES III, a power of 2.2 is obtained for near-field exposures using a fixed converter optimized at 20 MV. For HELIA, a power of 1.8 is obtained when the change in electron flow with voltage is also taken into account. This voltage dependence, together with the measured voltage and current waveforms on HELIA is used to calculate the expected temporal shape of the radiation pulse. The shape is consistent with that measured using a PIN diode.

• Research Organization: Sandia National Labs., Albuquerque, NM (USA)
• DOE Contract Number: AC04-76DP00789
• OSTI ID: 6727227
• Report Number(s): SAND-86-1921C; CONF-870302-11; ON: DE87006698
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
430300* -- Particle Accelerators-- Auxiliaries & Components
BEAMS
BREMSSTRAHLUNG
DIODE TUBES
ELECTROMAGNETIC RADIATION
ELECTRON BEAMS
ELECTRON GUNS
ELECTRON TUBES
EQUIPMENT
LEPTON BEAMS
PARTICLE BEAMS
RADIATION SOURCES
RADIATIONS
X-RAY EQUIPMENT
X-RAY SOURCES