Search Results - "Stephens, R. B."

Response of Root Respiration to Warming and Nitrogen Addition Depends on Tree Species by Muratore, T. J., Knorr, M. A., Simpson, M. J., Stephens, R. B., Phillips, R. P., Frey, S. D.

“…ABSTRACT Roots contribute a large fraction of CO2 efflux from soils, yet the extent to which global change factors affect root‐derived fluxes is poorly…”
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Focussing Protons from a Kilojoule Laser for Intense Beam Heating using Proximal Target Structures by McGuffey, C., Kim, J., Wei, M. S., Nilson, P. M., Chen, S. N., Fuchs, J., Fitzsimmons, P., Foord, M. E., Mariscal, D., McLean, H. S., Patel, P. K., Stephens, R. B., Beg, F. N.

“…Proton beams driven by chirped pulse amplified lasers have multi-picosecond duration and can isochorically and volumetrically heat material samples,…”
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Hot-electron temperature and laser-light absorption in fast ignition by Haines, M G, Wei, M S, Beg, F N, Stephens, R B

“…Experimental data [F. N. Beg, Phys. Plasmas 4, 447 (1997)10.1063/1.872103] indicate that for intense short-pulse laser-solid interactions at intensities up to…”
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Investigation of laser pulse length and pre-plasma scale length impact on hot electron generation on OMEGA-EP by Peebles, J, Wei, M S, Arefiev, A V, McGuffey, C, Stephens, R B, Theobald, W, Haberberger, D, Jarrott, L C, Link, A, Chen, H, McLean, H S, Sorokovikova, A, Krasheninnikov, S, Beg, F N

“…A series of experiments studying pre-plasma's effect on electron generation and transport due to a high intensity laser were conducted on the OMEGA-EP laser…”
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Effect of target material on fast-electron transport and resistive collimation by Chawla, S, Wei, M S, Mishra, R, Akli, K U, Chen, C D, McLean, H S, Morace, A, Patel, P K, Sawada, H, Sentoku, Y, Stephens, R B, Beg, F N

“…The effect of target material on fast-electron transport is investigated using a high-intensity (0.7 ps, 10(20)  W/cm2) laser pulse irradiated on multilayered…”
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Plasma devices to guide and collimate a high density of MeV electrons by Kodama, R, Sentoku, Y, Chen, Z. L, Kumar, G. R, Hatchett, S. P, Toyama, Y, Cowan, T. E, Freeman, R. R, Fuchs, J, Izawa, Y, Key, M. H, Kitagawa, Y, Kondo, K, Matsuoka, T, Nakamura, H, Nakatsutsumi, M, Norreys, P. A, Norimatsu, T, Snavely, R. A, Stephens, R. B, Tampo, M, Tanaka, K. A, Yabuuchi, T

“…The development of ultra-intense lasers has facilitated new studies in laboratory astrophysics and high-density nuclear science, including laser fusion. Such…”
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Dynamics of relativistic laser-plasma interaction on solid targets by Ping, Y, Kemp, A J, Divol, L, Key, M H, Patel, P K, Akli, K U, Beg, F N, Chawla, S, Chen, C D, Freeman, R R, Hey, D, Higginson, D P, Jarrott, L C, Kemp, G E, Link, A, McLean, H S, Sawada, H, Stephens, R B, Turnbull, D, Westover, B, Wilks, S C

“…A novel time-resolved diagnostic is used to record the critical surface motion during picosecond-scale relativistic laser interaction with a solid target…”
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Proton radiography of a laser-driven implosion by Mackinnon, A J, Patel, P K, Borghesi, M, Clarke, R C, Freeman, R R, Habara, H, Hatchett, S P, Hey, D, Hicks, D G, Kar, S, Key, M H, King, J A, Lancaster, K, Neely, D, Nikkro, A, Norreys, P A, Notley, M M, Phillips, T W, Romagnani, L, Snavely, R A, Stephens, R B, Town, R P J

“…Protons accelerated by a picosecond laser pulse have been used to radiograph a 500 microm diameter capsule, imploded with 300 J of laser light in 6…”
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Laser heating of solid matter by light-pressure-driven shocks at ultrarelativistic intensities by Akli, K U, Hansen, S B, Kemp, A J, Freeman, R R, Beg, F N, Clark, D C, Chen, S D, Hey, D, Hatchett, S P, Highbarger, K, Giraldez, E, Green, J S, Gregori, G, Lancaster, K L, Ma, T, MacKinnon, A J, Norreys, P, Patel, N, Pasley, J, Shearer, C, Stephens, R B, Stoeckl, C, Storm, M, Theobald, W, Van Woerkom, L D, Weber, R, Key, M H

“…The heating of solid targets irradiated by 5 x 10(20) W cm(-2), 0.8 ps, 1.05 microm wavelength laser light is studied by x-ray spectroscopy of the K-shell…”
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Hot electron temperature and coupling efficiency scaling with prepulse for cone-guided fast ignition by Ma, T, Sawada, H, Patel, P K, Chen, C D, Divol, L, Higginson, D P, Kemp, A J, Key, M H, Larson, D J, Le Pape, S, Link, A, MacPhee, A G, McLean, H S, Ping, Y, Stephens, R B, Wilks, S C, Beg, F N

“…The effect of increasing prepulse energy levels on the energy spectrum and coupling into forward-going electrons is evaluated in a cone-guided fast-ignition…”
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Implosion of indirectly driven reentrant-cone shell target by Stephens, R B, Hatchett, S P, Turner, R E, Tanaka, K A, Kodama, R

“…We have examined the implosion of an indirectly driven reentrant-cone shell target to clarify the issues attendant on compressing fuel for a fast ignition…”
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Pathological and molecular predictors of the response of rectal cancer to neoadjuvant radiochemotherapy by Smith, F.M., Reynolds, J.V., Miller, N., Stephens, R.B., Kennedy, M.J.

“…The prediction of sensitivity and resistance to neoadjuvant therapy has great potential value for many tumour sites. A neoadjuvant regimen is increasingly the…”
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Impact of extended preplasma on energy coupling in kilojoule energy relativistic laser interaction with cone wire targets relevant to fast ignition by Yabuuchi, T, Mishra, R, McGuffey, C, Qiao, B, Wei, M S, Sawada, H, Sentoku, Y, Ma, T, Higginson, D P, Akli, K U, Batani, D, Chen, H, Gizzi, L A, Key, M H, Mackinnon, A J, McLean, H S, Norreys, P A, Patel, P K, Stephens, R B, Ping, Y, Theobald, W, Stoeckl, C, Beg, F N

“…Cone-guided fast ignition laser fusion depends critically on details of the interaction of an intense laser pulse with the inside tip of a cone. Generation of…”
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Considerations on the learning curve for laparoscopic colorectal surgery : a view from the bottom by LEONG, S, CAHILL, R. A, MEHIGAN, B. J, STEPHENS, R. B

“…Those who have surmounted the learning curve for laparoscopic colorectal resection state that considerable numbers of highly selected cases should comprise a…”
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Dynamics of high-energy proton beam acceleration and focusing from hemisphere-cone targets by high-intensity lasers by Qiao, B, Foord, M E, Wei, M S, Stephens, R B, Key, M H, McLean, H, Patel, P K, Beg, F N

“…Acceleration and focusing of high-energy proton beams from fast-ignition (FI) -related hemisphere-cone assembled targets have been numerically studied by…”
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Visualizing fast electron energy transport into laser-compressed high-density fast-ignition targets by Jarrott, L. C., Wei, M. S., McGuffey, C., Solodov, A. A., Theobald, W., Qiao, B., Stoeckl, C., Betti, R., Chen, H., Delettrez, J., Döppner, T., Giraldez, E. M., Glebov, V. Y., Habara, H., Iwawaki, T., Key, M. H., Luo, R. W., Marshall, F. J., McLean, H. S., Mileham, C., Patel, P. K., Santos, J. J., Sawada, H., Stephens, R. B., Yabuuchi, T., Beg, F. N.

“…Recent progress in kilojoule-scale high-intensity lasers has opened up new areas of research in radiography, laboratory astrophysics, high-energy-density…”
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A prospective randomized trial of laparoscopic versus open appendectomy by Attwood, S E, Hill, A D, Murphy, P G, Thornton, J, Stephens, R B

“…Laparoscopic appendectomy is feasible, but whether it confers any advantage to patients with acute appendicitis is not known. We performed a randomized…”
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Numerical modeling of fast electron generation in the presence of preformed plasma in laser-matter interaction at relativistic intensities by Paradkar, B S, Wei, M S, Yabuuchi, T, Stephens, R B, Haines, M G, Krasheninnikov, S I, Beg, F N

“…Fast electron generation in the presence of coronal plasma in front of a solid target (typically referred to as preformed plasma) in laser-matter interaction…”
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Time-resolved compression of a capsule with a cone to high density for fast-ignition laser fusion by Theobald, W., Solodov, A. A., Stoeckl, C., Anderson, K. S., Beg, F. N., Epstein, R., Fiksel, G., Giraldez, E. M., Glebov, V. Yu, Habara, H., Ivancic, S., Jarrott, L. C., Marshall, F. J., McKiernan, G., McLean, H. S., Mileham, C., Nilson, P. M., Patel, P. K., Pérez, F., Sangster, T. C., Santos, J. J., Sawada, H., Shvydky, A., Stephens, R. B., Wei, M. S.

“…The advent of high-intensity lasers enables us to recreate and study the behaviour of matter under the extreme densities and pressures that exist in many…”
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Targets for high repetition rate laser facilities: needs, challenges and perspectives by Prencipe, I., Fuchs, J., Pascarelli, S., Schumacher, D. W., Stephens, R. B., Alexander, N. B., Briggs, R., Büscher, M., Cernaianu, M. O., Choukourov, A., De Marco, M., Erbe, A., Fassbender, J., Fiquet, G., Fitzsimmons, P., Gheorghiu, C., Hund, J., Huang, L. G., Harmand, M., Hartley, N. J., Irman, A., Kluge, T., Konopkova, Z., Kraft, S., Kraus, D., Leca, V., Margarone, D., Metzkes, J., Nagai, K., Nazarov, W., Lutoslawski, P., Papp, D., Passoni, M., Pelka, A., Perin, J. P., Schulz, J., Smid, M., Spindloe, C., Steinke, S., Torchio, R., Vass, C., Wiste, T., Zaffino, R., Zeil, K., Tschentscher, T., Schramm, U., Cowan, T. E.

“…A number of laser facilities coming online all over the world promise the capability of high-power laser experiments with shot repetition rates between 1 and…”
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