The Equivalence of Simple Models for Radiation-Induced Impulse

Lawrence, R. Jeffery

doi:10.1016/b978-0-444-89732-9.50179-5

Cited by 11 publications

(9 citation statements)

References 3 publications

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“…Poc(I0/A)213 (11) 2 2/3 T oc(I0A ) (12) r;loc (I /X4)113 (13) ... Cm ° (I0A2)113 (14) However, as will be discussed below, for intensities less than 40h1 W/cm2, the scaling laws are significantly different than that ofthe higher irradience:…”

Section: B Scaling Laws Overviewmentioning

confidence: 89%

<title>Ablation scaling laws for laser space debris clearing</title>

Hammerling¹,

Remo

1998

SPIE Proceedings

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Section: B Scaling Laws Overviewmentioning

confidence: 89%

<title>Ablation scaling laws for laser space debris clearing</title>

Hammerling¹,

Remo

1998

SPIE Proceedings

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“…The model targets are assumed to be uniform, isotropic, and homogeneous with negligible angular momentum (torque). This analytic impulse model has been used to calculate blow-off impulse and subsequent momentum coupling effects from nuclear explosions [12,13] on asteroids [3]. This research extends the analytic methodology to comet interactions.…”

Section: Momentum Coupling Analytic Impulse Modelmentioning

confidence: 99%

“…In this case the MBBAY model is integrated to yield a relatively simple closed-form expression for the impulse. Representing the impulse in a nondimensional form, I* = eff I / E 0 1/2 , as a function of the nondimensional fluence,  0 * =  eff  0 / E 0 , then equation (2) can be integrated in closed form, the result is [12] I*= α √2 {  0 * -[1 + ln  0 * + 1/2 (ln  0 *) 2 + 1/6 (ln  0 *) 3 ]} 1/2 (4a)…”

Section: Momentum Coupling Analytic Impulse Modelmentioning

confidence: 99%

High energy density soft X-ray momentum coupling to comet analogs for NEO mitigation

et al. 2016

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We applied MBBAY high fluence pulsed radiation intensity driven momentum transfer analysis to calculate X-ray momentum coupling coefficients C M = (Pa-s)/(J/m 2) for two simplified comet analog materials: i) water ice, and ii) 70% water ice and 30% distributed olivine grains. The momentum coupling coefficients (C M) max of 50 x10-5 s/m, are about an order of magnitude greater than experimentally determined and computed MBBAY values for meteoritic materials that are analogs for asteroids. From the values for comet analog materials we infer applied energies (via momentum transfer) required to deflect an Earth crossing comet from impacting Earth by a sufficient amount (~1 cm/s) to avert collision ~ a year in advance. Comet model calculations indicate for C M = 5 x 10-4 s/m the deflection of a 2 km comet with a density 600 kg/m 3 by 1 cm/s requires an applied energy on the target surface of 5 x 10 13 J, the equivalent of 12 kT of TNT. Depending on the geometrical configuration of the interaction the explosive yield required could be an order of magnitude higher.

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“…The x‐ray intensity on target ranged from 10 10 –10 11 W/cm 2 (10–100 J/cm 2 ). The recorded impulse was made approximately at the onset of the liquid‐vapor transition rather at vaporization [36]. Figure 4 illustrates the principle of this method.…”

Section: Impulse Measurementsmentioning

confidence: 99%