Experimental Time Resolved Electron Beam Temperature Measurements Using Bremsstrahlung Diagnostics
Conference
·
OSTI ID:8444
- Sandia National Laboratories
Electron beam temperature, {beta}{perpendicular} (= v{perpendicular}/v), is important to control for the development of high dose flash radiographic bremsstrahlung sources. At high voltage (> 5 MV) increasing electron beam temperature has a serious deleterious effect on dose production. The average and time resolved behavior of beam temperature was measured during radiographic experiments on the HERMES III accelerator (10 MV, 50 kA, 70 ns). A linear array of thermoluminescent dosimeters (TLDs) were used to estimate the time integrated average of beam temperature. On and off-axis photoconducting diamond (PCD) detectors were used to measure the time resolved bremsstrahlung dose rate, which is dependent on beam energy and temperature. The beam temperature can be determined by correlating PCD response with accelerator voltage and current and also by analyzing the ratio of PCD amplitudes on and off axis. This ratio is insensitive to voltage and current and thus, is more reliable than utilizing absolute dose rate. The data is unfolded using comparisons with Monte Carlo simulations to obtain absolute beam temperatures. The data taken on HERMES III show abrupt increases in {beta}{perpendicular} midway through the pulse indicating rapid onset of beam instability.
- Research Organization:
- Sandia National Labs., Albuquerque, NM (US); Sandia National Labs., Livermore, CA (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- AC04-94AL85000
- OSTI ID:
- 8444
- Report Number(s):
- SAND98-2813C
- Country of Publication:
- United States
- Language:
- English
Similar Records
Dose-voltage dependence for HELIA/HERMES III bremsstrahlung diodes
Experimental verification of dosimetry predictions of bremsstrahlung attenuation as a function of material and electron energy
Experimental verification of dosimetry predictions of bremsstrahlung attenuation as a function of material and electron energy
Conference
·
Wed Dec 31 23:00:00 EST 1986
·
OSTI ID:6727227
Experimental verification of dosimetry predictions of bremsstrahlung attenuation as a function of material and electron energy
Conference
·
Sat May 01 00:00:00 EDT 1993
·
OSTI ID:10161078
Experimental verification of dosimetry predictions of bremsstrahlung attenuation as a function of material and electron energy
Conference
·
Thu Dec 31 23:00:00 EST 1992
·
OSTI ID:6325943