Zobrazeno 1 - 10
of 57
pro vyhledávání: '"H. L. Andrews"'
Publikováno v:
mBio, Vol 11, Iss 3 (2020)
ABSTRACT Nontyphoidal salmonellae (NTS) are exposed to reactive oxygen species (ROS) during their residency in the gut. To survive oxidative stress encountered during infection, salmonellae employ several mechanisms. One of these mechanisms involves
Externí odkaz:
https://doaj.org/article/3bb804b013dc4b9dbfc70e9b8b365886
Autor:
H. L. Andrews, F. Bakkali Taheri, J. Barros, R. Bartolini, V. Bharadwaj, C. Clarke, N. Delerue, G. Doucas, N. Fuster-Martinez, M. Vieille-Grosjean, I. V. Konoplev, M. Labat, S. Le Corre, C. Perry, A. Reichold, S. Stevenson
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 17, Iss 5, p 052802 (2014)
We have used coherent Smith-Purcell radiation (cSPr) in order to determine the temporal profile of sub-ps long electron bunches at the Facility for Advanced Accelerator Experimental Tests, at SLAC. The measurements reported here were carried out in J
Externí odkaz:
https://doaj.org/article/2c7e168222544b6ab11e6641de6e0422
Autor:
D. C. Nguyen, N. A. Moody, H. L. Andrews, G. Bolme, L. J. Castellano, C. E. Heath, F. L. Krawczyk, S. I. Kwon, R. McCrady, F. A. Martinez, P. Marroquin, M. Prokop, R. M. Renneke, P. Roybal, W. T. Roybal, T. L. Tomei, P. A. Torrez, W. M. Tuzel, T. Zaugg
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 14, Iss 3, p 030704 (2011)
The LANL/AES normal-conducting radio-frequency injector has been tested at cw cathode gradients up to 10 MV/m. Field-emission electrons from a roughened copper cathode are accelerated to beam energy as high as 2.5 MeV and impinge on a stainless steel
Externí odkaz:
https://doaj.org/article/acbecca9deb1454ab3dd5d990624d772
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 13, Iss 2, p 020701 (2010)
We present an analytic theory for the small-signal operation of a grating-based free-electron laser that includes the effects of transverse diffraction on the evanescent wave. In this device, the electron beam interacts with an evanescent wave of the
Externí odkaz:
https://doaj.org/article/5170b07c4f2c419b96e8b2877f53daca
Autor:
H. L. Andrews, C. A. Brau, J. D. Jarvis, C. F. Guertin, A. O’Donnell, B. Durant, T. H. Lowell, M. R. Mross
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 12, Iss 8, p 080703 (2009)
We present experimental observations of evanescent waves in a Smith-Purcell free-electron laser (FEL). These waves, predicted by both theory and simulations, have wavelengths longer than the Smith-Purcell radiation, group velocity antiparallel to the
Externí odkaz:
https://doaj.org/article/6495a576335c421e9df37bd6ba5f0820
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 8, Iss 11, p 110702 (2005)
Smith-Purcell (SP) radiation is emitted when an electron passes close to the surface of a metallic grating. The radiation becomes coherent (fluence proportional to the square of the number of electrons) when the electrons are in bunches whose dimensi
Externí odkaz:
https://doaj.org/article/689abdc9acd7459aade746772c76f3c3
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 8, Iss 5, p 050703 (2005)
It has previously been shown that the electron beam in a Smith-Purcell free-electron laser interacts with a synchronous evanescent wave. At high electron energy, the group velocity of this wave is positive and the device operates on a convective inst
Externí odkaz:
https://doaj.org/article/b0df889ef2f24388a1b1dda9ca2fe7f8
Autor:
H. L. Andrews, C. A. Brau
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 7, Iss 7, p 070701 (2004)
A formula is derived for the small-signal gain of a Smith-Purcell free-electron laser. The theory describes the electron beam as a moving plasma dielectric, and assumes that the electron beam interacts with an evanescent mode traveling along the surf
Externí odkaz:
https://doaj.org/article/09f454fa316746f9ae106604a154d6e4
Autor:
G. Doucas, M. F. Kimmitt, A. Doria, G. P. Gallerano, E. Giovenale, G. Messina, H. L. Andrews, J. H. Brownell
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 5, Iss 7, p 072802 (2002)
Coherent enhancement of the Smith-Purcell radiation produced from the interaction of a 1.8 MeV electron beam with a grating has been observed. The emitted radiation has been measured at angles in the 40° to 120° range, which correspond to wavelengt
Externí odkaz:
https://doaj.org/article/c25227abac6448839c9af0ee6131893f
Publikováno v:
2018 IEEE International Power Modulator and High Voltage Conference (IPMHVC).
Insulator surface flashover in vacuum due to pulsed and DC voltages has been thoroughly investigated, however the characteristics of surface flashover under multiple, short duration, high-voltage pulses are not well understood. A test stand has been
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::7f190c965754f96bce99bc2607809c2c
https://doi.org/10.1109/ipmhvc.2018.8936711
https://doi.org/10.1109/ipmhvc.2018.8936711