Range and straggling effects on CR-39/range-filter ion energy measurements

Lapin, S. N.; Cooper, G. W.; Davis, Lorna; Bailey, James E.; Stygar, W. A.; Carlson, A. L.; Reyes, P.

doi:10.1063/1.1143543

Cited by 4 publications

(2 citation statements)

References 2 publications

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“…21 Because of the limited interval of particle energies that can be accurately studied with a single filter thickness, it is natural in many applications to use a ''step'' filter with sections of different thickness. Small numbers of steps have been used, without calculating spectral structure within each step, for broadband spectral information in ICF experiments for deuterons and tritons 10,15 and for protons, 12,16,19,22,23 while up to 20 steps, with spectral decomposition within each step, have been used for more detailed proton spectra from the interaction of high-intensity, short-pulse lasers with solids. 61…”

Section: B Simple Range-filter Spectrometersmentioning

confidence: 99%

Spectrometry of charged particles from inertial-confinement-fusion plasmas

Séguin

Frenje

et al. 2003

Review of Scientific Instruments

230

133

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High-resolution spectrometry of charged particles from inertial-confinement-fusion ͑ICF͒ experiments has become an important method of studying plasma conditions in laser-compressed capsules. In experiments at the 60-beam OMEGA laser facility ͓T. R. Boehly et al., Opt. Commun. 133, 495 ͑1997͔͒, utilizing capsules with D 2 , D 3 He, DT, or DTH fuel in a shell of plastic, glass, or D 2 ice, we now routinely make spectral measurements of primary fusion products ͑p, D, T, 3 He, ␣͒, secondary fusion products ͑p͒, ''knock-on'' particles ͑p, D, T͒ elastically scattered by primary neutrons, and ions from the shell. Use is made of several types of spectrometers that rely on detection and identification of particles with CR-39 nuclear track detectors in conjunction with magnets and/or special ranging filters. CR-39 is especially useful because of its insensitivity to electromagnetic noise and its ability to distinguish the types and energies of individual particles, as illustrated here by detailed calibrations of its response to 0.1-13.8 MeV protons from a Van de Graaff accelerator and to p, D, T, and ␣ from ICF experiments at OMEGA. A description of the spectrometers is accompanied by illustrations of their operating principles using data from OMEGA. Sample results and discussions illustrate the relationship of secondary-proton and knock-on spectra to capsule fuel and shell areal densities and radial compression ratios; the relationship of different primary fusion products to each other and to ion temperatures; the relationship of deviations from spherical symmetry in particle yields and energies to capsule structure; the acceleration of fusion products and the spectra of ions from the shell due to external fields; and other important physical characteristics of the laser-compressed capsules.

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Section: B Simple Range-filter Spectrometersmentioning

confidence: 99%

Spectrometry of charged particles from inertial-confinement-fusion plasmas

Séguin

Frenje

et al. 2003

Review of Scientific Instruments

230

133

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“…A separate method to measure voltage in the MITL feeds close to the diode is based on a time-dependent version of a CR-39/range-filter peak voltage diagnostic previously developed. 31 A small piece of PVC-coated fiberglass mesh is placed in the MITL feed upstream of the diode, which acts as an ion source. Opposite the mesh is an array of small scintillators, operated in close proximity on the cathode side and each connected to a fiber optic feed to a detector.…”

Section: A Beam Diagnosticsmentioning

confidence: 99%

Development of the laser evaporation ion source for lithium beam generation on the Particle Beam Fusion Accelerator (PBFA-II)

et al. 1999

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Intense-heavy-ion-beam transport through an insulator beam guide for heavy ion fusion AIP Conf.The Laser Evaporation Ion Source ͑LEVIS͒ active lithium ion source has been developed for use on the focusing ion diode operated on the 10 TW Particle Beam Fusion Accelerator-II ͑PBFA-II͒ ͓J. P. VanDevender and D. L. Cook, Science 232, 831 ͑1986͔͒ at Sandia National Laboratories. The source configuration consists of two laser pulses impinging on a heated ͑200°C͒ thin-film LiAg layer on the anode surface. A short-pulse Nd:YAG laser creates a high-density vapor, which is then ionized by a long-pulse dye laser using the LIBORS ͑laser ionization based on resonant saturation͒ ionization method. Small-scale experiments determined that this dual laser-based approach can produce a source plasma of adequate density and confinement for acceleration and transport. Hardware modifications were undertaken to correct problems of premature impedance collapse and lack of beam lithium seen on previous PBFA-II experiments. As much as 85 kJ of Li is measured at the beam focus, but the source may not have been operating in a fully active ͑i.e., preformed͒ manner. Focusing performance appears superior to a passive LiF ion source operated on PBFA-II with the same magnetic field topology.

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