Zobrazeno 1 - 10
of 30
pro vyhledávání: '"P. G. O'Shea"'
Autor:
Adams L Sibley, Seth M Noar, Kathryn E Muessig, Nisha G O'Shea, Catherine E Paquette, Abby G Spears, William C Miller, Vivian F Go
Publikováno v:
JMIR Research Protocols, Vol 13, p e59224 (2024)
BackgroundStigma is a barrier to treatment and harm reduction seeking in people who use drugs. Most stigma reduction interventions offer psychotherapy or psychoeducation in group-based clinical settings, failing to reach people who are not in treatme
Externí odkaz:
https://doaj.org/article/ca0a7f748c6b4b9fa485958040a3072c
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 14, Iss 10, p 104202 (2011)
We apply the Venturini-Reiser (V-R) envelope-dispersion equations [M. Venturini and M. Reiser, Phys. Rev. Lett. 81, 96 (1998)PRLTAO0031-900710.1103/PhysRevLett.81.96] to a continuous beam in a uniform focusing/bending lattice to study the combined ef
Externí odkaz:
https://doaj.org/article/115583da015b4531af36a97dca75396f
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 13, Iss 8, p 080704 (2010)
The emittance of a photocathode is evaluated using a distribution function (“Moments”) approach to calculate the moments of the momentum. The effects of temperature and field, which affect the electron distribution and transmission probability, r
Externí odkaz:
https://doaj.org/article/dbb1ba19b1c643b8b2155b582d3d0c26
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 13, Iss 3, p 034201 (2010)
Detailed experimental measurements are presented concerning the propagation of space-charge waves of varying amplitudes in an intense, charged-particle beam. A short perturbation to the density profile is applied at the electron gun, and both current
Externí odkaz:
https://doaj.org/article/d1e19727daa946c7b9c82cdb9c33f7b6
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 12, Iss 6, p 064201 (2009)
We study, experimentally and numerically, the relaxation of an initially nonuniform intense beam in an alternating-gradient transport line. A nonlinear distribution consisting of five interacting beamlets is created and tracked for longer than seven
Externí odkaz:
https://doaj.org/article/36ef52ac062a457eba06bf604afdc338
Autor:
D. Stratakis, R. A. Kishek, R. B. Fiorito, K. Tian, I. Haber, P. G. O’Shea, M. Reiser, J. C. T. Thangaraj
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 12, Iss 2, p 020101 (2009)
Knowledge of the three-dimensional structure of a charged particle beam bunch is essential for understanding its evolution and for initializing computer simulations, especially when space charge is involved. This paper presents a novel experimental m
Externí odkaz:
https://doaj.org/article/696f121ef43543e4b6f2297fcce7ccae
Autor:
M. A. Holloway, R. B. Fiorito, A. G. Shkvarunets, P. G. O’Shea, S. V. Benson, D. Douglas, P. Evtushenko, K. Jordan
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 11, Iss 8, p 082801 (2008)
High brightness electron accelerators, such as energy recovery linacs (ERL), often have complex particle distributions that can create difficulties in beam transport as well as matching to devices such as wigglers used to generate radiation from the
Externí odkaz:
https://doaj.org/article/df6cbdda56e240d59e3860bdaa606db5
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 11, Iss 8, p 081001 (2008)
Analytically tractable models of thermal-field emission, field enhancement, and heating mechanisms (Nottingham and resistive) are developed and combined to make estimates of the fields and temperatures that accompany the development and growth of asp
Externí odkaz:
https://doaj.org/article/fa21533966d5456a8baf556cd137aec6
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 9, Iss 11, p 112801 (2006)
A technique is described for the tomographic mapping of transverse phase space in beams with space charge. Most prior studies where performed at high energy where space charge was negligible and therefore not considered in the analysis. The tomograph
Externí odkaz:
https://doaj.org/article/6dd682c9548f4859ae7e2041f796ddad
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 9, Iss 6, p 064202 (2006)
We present detailed calculations of RMS-envelope matching over a broad range of beam intensities for the University of Maryland Electron Ring (UMER). Containment of beams from zero current to extreme space charge, all without changing the strength of
Externí odkaz:
https://doaj.org/article/f6b1eafe2c34439e96e939babde316c2