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Your search keyword '"Andrews, D. S."' showing total 12 results
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12 results on '"Andrews, D. S."'

2. Acceleration of collimated 45 MeV protons by collisionless shocks driven in low-density, large-scale gradient plasmas by a 10^20 W/cm^2, 1 micron wavelength laser

Author

Antici, P., Boella, E., Chen, S. N., Andrews, D. S., Barberio, M., Böker, J., Cardelli, F., Feugeas, J. L., Glesser, M., Nicolaï, P., Romagnani, L., Sciscio, M., Starodubtsev, M., Willi, O., Kieffer, J. C., Tikhonchuk, V., Pépin, H., Silva, L. O., Humières, E. d, and Fuchs, J.

Subjects
Physics - Plasma Physics
Abstract

A new type of proton acceleration stemming from large-scale gradients, low-density targets, irradiated by an intense near-infrared laser is observed. The produced protons are characterized by high-energies (with a broad spectrum), are emitted in a very directional manner, and the process is associated to relaxed laser (no need for high-contrast) and target (no need for ultra-thin or expensive targets) constraints. As such, this process appears quite effective compared to the standard and commonly used Target Normal Sheath Acceleration technique (TNSA), or more exploratory mechanisms like Radiation Pressure Acceleration (RPA). The data are underpinned by 3D numerical simulations which suggest that in these conditions Low Density Collisionless Shock Acceleration (LDCSA) is at play, which combines an initial Collisionless Shock Acceleration (CSA) to a boost procured by a TNSA-like sheath field in the downward density ramp of the target, which leads to an overall broad spectrum. Experiments performed at 10^20 W/cm^2 laser intensity show that LDCSA can accelerate, from ~1% critical density, mm-scale targets, up to 5x10^9 protons/MeV/sr/J with energies up to 45(+/- 5) MeV in a collimated (~6$^\circ$ half-angle) manner.

Published
2017

4. Acceleration of collimated 45 MeV protons by collisionless shocks driven in low-density, large-scale gradient plasmas by a 1020 W/cm2, 1 µm laser

Author

Antici, P., primary, Boella, E., additional, Chen, S. N., additional, Andrews, D. S., additional, Barberio, M., additional, Böker, J., additional, Cardelli, F., additional, Feugeas, J. L., additional, Glesser, M., additional, Nicolaï, P., additional, Romagnani, L., additional, Scisciò, M., additional, Starodubtsev, M., additional, Willi, O., additional, Kieffer, J. C., additional, Tikhonchuk, V., additional, Pépin, H., additional, Silva, L. O., additional, Humières, E. d’, additional, and Fuchs, J., additional

Published
2017
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5. Bath and Wells : A Sketch-book

Author

Andrews, D. S. and Andrews, D. S.

Abstract

Found in our archives, the Black's Sketchbooks are a series of books produced in the early 20th century by a group of well-known artists. Each book contains pen sketches of iconic English and Scottish cities and counties. There are also some books on famous Continental cities such as Paris and Venice. The result is a charming series of books that present a fascinating look at British and European locations as they were almost a century ago.This title looks at Bath and Wells as they were in 1920.

Published
2009

10. Acceleration of collimated 45 MeV protons by collisionless shocks driven in low-density, large-scale gradient plasmas by a 10 20  W/cm 2 , 1 µm laser.

Author

Antici P, Boella E, Chen SN, Andrews DS, Barberio M, Böker J, Cardelli F, Feugeas JL, Glesser M, Nicolaï P, Romagnani L, Scisciò M, Starodubtsev M, Willi O, Kieffer JC, Tikhonchuk V, Pépin H, Silva LO, Humières E, and Fuchs J

Abstract

A new type of proton acceleration stemming from large-scale gradients, low-density targets, irradiated by an intense near-infrared laser is observed. The produced protons are characterized by high-energies (with a broad spectrum), are emitted in a very directional manner, and the process is associated to relaxed laser (no need for high-contrast) and target (no need for ultra-thin or expensive targets) constraints. As such, this process appears quite effective compared to the standard and commonly used Target Normal Sheath Acceleration technique (TNSA), or more exploratory mechanisms like Radiation Pressure Acceleration (RPA). The data are underpinned by 3D numerical simulations which suggest that in these conditions a Low Density Collisionless Shock Acceleration (LDCSA) mechanism is at play, which combines an initial Collisionless Shock Acceleration (CSA) to a boost procured by a TNSA-like sheath field in the downward density ramp of the target, leading to an overall broad spectrum. Experiments performed at a laser intensity of 10 20  W/cm 2 show that LDCSA can accelerate, from ~1% critical density, mm-scale targets, up to 5 × 10 9 protons/MeV/sr/J with energies up to 45(±5) MeV in a collimated (~6° half-angle) manner.

Published
2017
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11. Reduction of mercury, copper, nickel, cadmium, and zinc levels in solution by competitive adsorption onto peanut hulls, and raw and aged bark.

Author

Henderson RW, Andrews DS, Lightsey GR, and Poonawala NA

Subjects
Adsorption, Cadmium isolation & purification, Copper isolation & purification, Costs and Cost Analysis, Mercury isolation & purification, Nickel isolation & purification, Particle Size, Time Factors, Zinc isolation & purification, Arachis, Metals isolation & purification, Sewage, Trees, Waste Disposal, Fluid
Abstract

The competitive adsorption of common heavy metal ions by peanut hulls, raw bark, and composted bark was studied. These solid wastes were found to adsorb significant amounts of one or more of the heavy metals (Hg, Cu, Ni, Cd, Zn) commonly found in municipal sludge and wastewater.

Published
1977
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