Spot size measurement of the DARHT First Axis radiographic source

McCuistian, B.T.; Rose, E.A.; Moir, D.C.; Bender, H.; Carlson, Carl A.; Hollabaugh, Craig

doi:10.1109/plasma.2008.4591069

Cited by 5 publications

(8 citation statements)

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“…If we ignore beam-target interactions 21,22 for the moment, then the three main contributing factors governing the spot size r at the final focus are emittance, beam transport mismatches, and spherical aberration. The scaling of r can be determined analytically by considering the root sum of the squares for each contributing factor and finding the optimum spot size in terms of the convergence angle a.…”

Section: Discussionmentioning

confidence: 99%

Quantifying spot size reduction of a 1.8 kA electron beam for flash radiography

Burris-Mog

Moir

2018

Journal of Applied Physics

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The spot size of Axis-I at the Dual Axis Radiographic Hydrodynamic Test facility was reduced by 15.5% by including a small diameter drift tube that acts to aperture the outer diameter of the electron beam. Comparing the measured values to both analytic calculations and results from a particle-in-cell model shows that one-third to one-half of the spot size reduction is due to a drop in beam emittance. We infer that one-half to two-thirds of the spot-size reduction is due to a reduction in beam-target interactions. Sources of emittance growth and the scaling of the final focal spot size with emittance and solenoid aberrations are also presented.

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Section: Discussionmentioning

confidence: 99%

Quantifying spot size reduction of a 1.8 kA electron beam for flash radiography

Burris-Mog

Moir

2018

Journal of Applied Physics

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“…(Caporaso, Chen, et al, 1998;Welch and Hughes, 1998) -During experiments on axis 1 spot size remained under "average" until after 60 ns. (McCuistian, Moir, and Evan, 2008). -Onset is highly dependent on starting beam size (Vermare et al, 2003) and desorbed species (Caporaso, Chen, et al, 1998;Welch and Hughes, 1998) (McCuistian, Moir, and Evan, 2008) Los Desorption is not Diffusion Limited Over a 80 ns Pulse…”

Section: Beam-target Interaction Meetingmentioning

confidence: 99%

Thermal Desorption Spectroscopy [Slides]

Press

2020

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“…Resolution is ultimately limited by the radiation source spot size, which is measured at the different laboratories in a variety of ways [29,40]. For this review, the spot size will be defined as the full width at half maximum (FWHM) of the intensity distribution.…”

Section: Hydrotest Radiographymentioning

confidence: 99%

“…The physics influencing the spot size includes final-focus solenoid focal length and aberrations, beam emittance, energy spread and temporal variation, and beam motion [67,68], as well as beam interactions with the bremsstrahlung target [69,70]. The focal length is usually a design constraint, so the accelerator physics emphasis has been on beam stability, and minimizing motion and emittance.…”

Section: Linear Induction Acceleratorsmentioning

confidence: 99%

“…For the 1.8 kA pulse, a 570 rad@1m dose has been measured using a platinum foil calorimeter, and the 0.75 mm FWHM spot size measured with a 0.4 mm diameter pinhole and various cameras, including time-resolved measurements [70]. The dose and spot size can be tuned to match the dynamic experiment by changing the cathode to produce a different current.…”

Section: Darht Axis-imentioning

confidence: 99%

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Particle Beam Radiography

Peach

Ekdahl

2013

Rev. Accl. Sci. Tech.

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Particle beam radiography, which uses a variety of particle probes (neutrons, protons, electrons, gammas and potentially other particles) to study the structure of materials and objects noninvasively, is reviewed, largely from an accelerator perspective, although the use of cosmic rays (mainly muons but potentially also high-energy neutrinos) is briefly reviewed. Tomography is a form of radiography which uses multiple views to reconstruct a three-dimensional density map of an object. There is a very wide range of applications of radiography and tomography, from medicine to engineering and security, and advances in instrumentation, specifically the development of electronic detectors, allow rapid analysis of the resultant radiographs. Flash radiography is a diagnostic technique for large high-explosive-driven hydrodynamic experiments that is used at many laboratories. The bremsstrahlung radiation pulse from an intense relativistic electron beam incident onto a high-Z target is the source of these radiographs. The challenge is to provide radiation sources intense enough to penetrate hundreds of g/cm 2 of material, in pulses short enough to stop the motion of high-speed hydrodynamic shocks, and with source spots small enough to resolve fine details. The challenge has been met with a wide variety of accelerator technologies, including pulsed-power-driven diodes, air-core pulsed betatrons and high-current linear induction accelerators. Accelerator technology has also evolved to accommodate the experimenters' continuing quest for multiple images in time and space. Linear induction accelerators have had a major role in these advances, especially in providing multiple-time radiographs of the largest hydrodynamic experiments.

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Spot size measurement of the DARHT First Axis radiographic source

Cited by 5 publications

References 0 publications

Quantifying spot size reduction of a 1.8 kA electron beam for flash radiography

Quantifying spot size reduction of a 1.8 kA electron beam for flash radiography

Thermal Desorption Spectroscopy [Slides]

Particle Beam Radiography

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