Zobrazeno 1 - 10
of 159
pro vyhledávání: '"Alexander Aleksandrov"'
Publikováno v:
Journal of Applied and Computational Mechanics, Vol 8, Iss 3, Pp 1113-1119 (2022)
With the aid of the decomposition method and the Lyapunov direct method, stability of linear gyroscopic systems with switching and a constant delay in positional forces is investigated. The cases of synchronous and asynchronous switching are studied.
Externí odkaz:
https://doaj.org/article/32bf91355be84d7698eeca5e5d1475e5
Autor:
Alexander Aleksandrov, Sarah Cousineau, Timofey Gorlov, Yun Liu, Abdurahim Oguz, Andrei Shishlo, Alexander Zhukov, Martin Kay
Publikováno v:
Physical Review Accelerators and Beams, Vol 26, Iss 4, p 043501 (2023)
Charge exchange injection is the standard mechanism used to accumulate short, intense pulses of proton beams from an H^{-} injector into a synchrotron. Historically, this process has relied on injection foils to remove the two electrons from the H^{-
Externí odkaz:
https://doaj.org/article/449d68b8da1b46d083437009e1176c37
Publikováno v:
IEEE Access, Vol 9, Pp 132623-132630 (2021)
An artificial Earth satellite (AES) with three different principal central moments of inertia is under consideration. The AES moves along a Keplerian circular equatorial near-Earth orbit. The AES is equipped with electrodynamic attitude control syste
Externí odkaz:
https://doaj.org/article/dab39474cebc46c2a4fef61a83c814a9
Publikováno v:
Physical Review Accelerators and Beams, Vol 25, Iss 4, p 042801 (2022)
Utilizing noninvasive 2D scans with laser wires, we tomographically reconstructed the 4D transverse phase space distribution of a 1-GeV hydrogen ion (i.e., H^{-}) beam during operation. The 4D tomography is based on two new advances. First, we extend
Externí odkaz:
https://doaj.org/article/023497f5b9074da4bbfd2c606e4e4f8f
Autor:
Jonathan C. Wong, Alexander Aleksandrov, Sarah Cousineau, Timofey Gorlov, Yun Liu, Abdurahim Rakhman, Andrei Shishlo
Publikováno v:
Physical Review Accelerators and Beams, Vol 24, Iss 3, p 032801 (2021)
Laser-assisted charge exchange (LACE) is a novel scheme for injecting H^{-} ions into proton rings. Lorentz stripping of H^{-} ions into bare protons in magnetic dipoles is enabled by laser excitation that reduces the electron binding energy. We show
Externí odkaz:
https://doaj.org/article/482feb900c0146678aee5789353dac62
Autor:
Timofey Gorlov, Alexander Aleksandrov, Sarah Cousineau, Yun Liu, Abdurahim Rakhman, Andrei Shishlo
Publikováno v:
Physical Review Accelerators and Beams, Vol 22, Iss 12, p 121601 (2019)
A new scheme with sequential resonant excitation for laser assisted charge exchange injection of H^{−} beams is proposed. In contrast with the one step excitation scheme, the proposed scheme requires significantly less laser power for high efficien
Externí odkaz:
https://doaj.org/article/380f2e38168f43a3816698bceb096beb
Autor:
Sarah Cousineau, Abdurahim Rakhman, Martin Kay, Alexander Aleksandrov, Viatcheslav Danilov, Timofey Gorlov, Yun Liu, Cary Long, Alexander Menshov, Michael Plum, Andrei Shishlo, Andrew Webster, David Johnson
Publikováno v:
Physical Review Accelerators and Beams, Vol 20, Iss 12, p 120402 (2017)
Laser-assisted stripping is a novel approach to H^{-} charge exchange that overcomes long-standing limitations associated with the traditional, foil-based method of producing high-intensity, time-structured beams of protons. This paper reports on the
Externí odkaz:
https://doaj.org/article/6a2e70efdb304558b87676e3a97c279c
Autor:
Sang-ho Kim, Alexander Aleksandrov, Mark Crofford, John Galambos, Paul Gibson, Tom Hardek, Stuart Henderson, Yoon Kang, Kay Kasemir, Charles Peters, David Thompson, Martin Stockli, Derrick Williams
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 13, Iss 7, p 070101 (2010)
The Spallation Neutron Source (SNS) radio-frequency quadrupole (RFQ) had resonance control instabilities at duty factors higher than approximately 4%. Systematic investigations have been carried out to understand the cause of the instability and to e
Externí odkaz:
https://doaj.org/article/1d0119903de64b18b16dee582deab2c5
Publikováno v:
International Journal of Robust and Nonlinear Control. 33:2902-2912
Publikováno v:
International Journal of Dynamics and Control.