Design of an electronic charged particle spectrometer to measure {l_angle}{rho}R{r_angle} on inertial fusion experiments
- Plasma Fusion Center, Massachusetts Institute of Technology, Cambridge, Massachusetts (United States)
- Lincoln Laboratory, Massachusetts Institute of Technology, Lexington, Massachusetts (United States)
- Laboratory for Laser Energetics, University of Rochester, Rochester, New York 14623 (United States)
- Lawrence Livermore National Laboratory, Livermore, California 94550 (United States)
The design and fabrication of a new diagnostic that measures the energy spectra of charged particles from targets on the Omega Upgrade are actively underway. Using seven 512{times}512 charge coupled devices (CCDs) and a 7.5 kG permanent magnet, this instrument will uniquely determine particle identities and measure particle energies from 1 MeV up to the maximum charged particle energies of interest for {rho}R measurements (10.6 MeV knock-on tritons, 12.5 MeV knock-on deuterons and 30.8 MeV tertiary protons). The resolution of the diagnostic will be better than 5{percent}. We have tested the response of SITe back-illuminated CCDs to 1.2{endash}13.6 MeV protons from our Cockcroft{endash}Walton accelerator and to alpha particles from an Am{sup 241} source, and the results agree extremely well with predictions. With its high density picture elements, each CCD has 10{sup 5} single-hit detectors. In the case of a low DT yield of 10{sup 9} neutrons, about 100 knock-on charged particles will be detected when the spectrometer aperture is 60 cm from the implosion. Measurements of {rho}R up to 150 mg/cm{sup 2} can be obtained from knock-on D and T spectra, and values up to 300 mg/cm{sup 2} can be determined from secondary proton spectra. The sensitivity of the CCDs to 14 and 2.5 MeV neutrons has been experimentally determined using our Cockcroft{endash}Walton accelerator source and indicates that by incorporating neutron shielding, the signal to neutron noise ratio at a yield of 10{sup 11} will be better than 100:1. In the development phases of this program, we plan to utilize CR-39 track detectors concurrently with the CCDs. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 451810
- Report Number(s):
- CONF-960543--
- Journal Information:
- Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 68; ISSN 0034-6748; ISSN RSINAK
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ALPHA PARTICLES
CHARGE-COUPLED DEVICES
CHARGED PARTICLE DETECTION
CHARGED-PARTICLE TRANSPORT
DESIGN
DEUTERONS
EXPLOSIONS
FABRICATION
MEV RANGE
OMEGA FACILITY
PLASMA DIAGNOSTICS
SENSITIVITY
SPECTROMETERS
TRITONS
fusion reactor ignition
fusion reactor instrumentation
particle spectrometers
plasma inertial confinement