High-resolution Thomson parabola for ion analysis

Cobble, J.A.; Flippo, K. A.; Offermann, Dustin; Lopez, F. E.; Oertel, J. A.; Mastrosimone, D.; Letzring, S.; Sinenian, N.

doi:10.1063/1.3658048

Cited by 34 publications

(17 citation statements)

References 23 publications

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“…Both neutral and charged mesons are formed, which means that time measuring methods are preferred here instead of electric analyzing fields [19,20]. Further, without the time measurements, the very important particle decay time information would be lost.…”

Section: Introductionmentioning

confidence: 99%

Mesons from Laser-Induced Processes in Ultra-Dense Hydrogen H(0)

Holmlid

2017

PLoS ONE

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Large signals of charged light mesons are observed in the laser-induced particle flux from ultra-dense hydrogen H(0) layers. The mesons are formed in such layers on metal surfaces using < 200 mJ laser pulse-energy. The time variation of the signal to metal foil collectors and the magnetic deflection to a movable pin collector are now studied. Relativistic charged particles with velocity up to 500 MeV u-1 thus 0.75 c are observed. Characteristic decay time constants for meson decay are observed, for charged and neutral kaons and also for charged pions. Magnetic deflections agree with charged pions and kaons. Theoretical predictions of the decay chains from kaons to muons in the particle beam agree with the results. Muons are detected separately by standard scintillation detectors in laser-induced processes in ultra-dense hydrogen H(0) as published previously. The muons formed do not decay appreciably within the flight distances used here. Most of the laser-ejected particle flux with MeV energy is not deflected by the magnetic fields and is thus neutral, either being neutral kaons or the ultra-dense HN(0) precursor clusters. Photons give only a minor part of the detected signals. PACS: 67.63.Gh, 14.40.-n, 79.20.Ds, 52.57.-z.

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Section: Introductionmentioning

confidence: 99%

Mesons from Laser-Induced Processes in Ultra-Dense Hydrogen H(0)

Holmlid

2017

PLoS ONE

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“…4 Additionally, backlighting of HED plasmas with high-energy charged particles has recently provided new insights into magnetic and electric field generation and evolution in contexts relevant to ICF, basic plasma physics, and laboratory astrophysics. [5][6][7][8][9][10] The solid-state nuclear track detector CR-39 11 has provided the basis for many neutron and charged particle diagnostics 5,[12][13][14][15][16][17][18][19][20] for HED and ICF experiments at both the OMEGA laser facility 21 and the National Ignition Facility (NIF). 22 CR-39, a transparent plastic, detects charged particles with energy on the order of 1-10 MeV with 100% efficiency.…”

Section: Introductionmentioning

confidence: 99%

Impact of x-ray dose on track formation and data analysis for CR-39-based proton diagnostics

Rinderknecht

Rojas-Herrera

Zylstra

et al. 2015

Review of Scientific Instruments

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The nuclear track detector CR-39 is used extensively for charged particle diagnosis, in particular proton spectroscopy, at inertial confinement fusion facilities. These detectors can absorb x-ray doses from the experiments in the order of 1-100 Gy, the effects of which are not accounted for in the previous detector calibrations. X-ray dose absorbed in the CR-39 has previously been shown to affect the track size of alpha particles in the detector, primarily due to a measured reduction in the material bulk etch rate [Rojas-Herrera et al., Rev. Sci. Instrum. 86, 033501 (2015)]. Similar to the previous findings for alpha particles, protons with energies in the range 0.5-9.1 MeV are shown to produce tracks that are systematically smaller as a function of the absorbed x-ray dose in the CR-39. The reduction of track size due to x-ray dose is found to diminish with time between exposure and etching if the CR-39 is stored at ambient temperature, and complete recovery is observed after two weeks. The impact of this effect on the analysis of data from existing CR-39-based proton diagnostics on OMEGA and the National Ignition Facility is evaluated and best practices are proposed for cases in which the effect of x rays is significant.

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“…The magnetic field inside a yoke can either be mapped empirically using a Hall probe [25,26], or modelled numerically as described in Refs. [27][28][29]. The signal obtained on the detector along a given parabolic ion trace can be converted to a raw ion spectrum using the Eqs.…”

Section: Basics Of the Thomson Parabola Spectrometermentioning

confidence: 99%