Zobrazeno 1 - 10
of 948
pro vyhledávání: '"I. Hofmann"'
Publikováno v:
Physical Review Accelerators and Beams, Vol 23, Iss 12, p 124202 (2020)
High intensity beams may suffer from serious beam quality degradation if the focusing scheme allows for occurrence of resonances or instabilities. For transverse focusing a commonly accepted and respected lattice design rule is to choose the phase ad
Externí odkaz:
https://doaj.org/article/452157d3a8984ac287d9267140f48a56
Autor:
I. Hofmann, O. Boine-Frankenheim
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 17, Iss 12, p 124201 (2014)
The numerical noise inherent to particle-in-cell (PIC) simulation of 3d anisotropic high intensity bunched beams in periodic focusing is compared with the analytical model by Struckmeier [Part. Accel. 45, 229 (1994)]. The latter assumes that entropy
Externí odkaz:
https://doaj.org/article/74d11d1c1bcf41c1b37bbe46d9a912c0
Focusing and transport of high-intensity multi-MeV proton bunches from a compact laser-driven source
Autor:
S. Busold, D. Schumacher, O. Deppert, C. Brabetz, S. Frydrych, F. Kroll, M. Joost, H. Al-Omari, A. Blažević, B. Zielbauer, I. Hofmann, V. Bagnoud, T. E. Cowan, M. Roth
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 16, Iss 10, p 101302 (2013)
Laser ion acceleration provides for compact, high-intensity ion sources in the multi-MeV range. Using a pulsed high-field solenoid, for the first time high-intensity laser-accelerated proton bunches could be selected from the continuous exponential s
Externí odkaz:
https://doaj.org/article/e4f5cf0e18e1405496053ba4b3b6fb73
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 15, Iss 5, p 051302 (2012)
Proton bunches with energies up to 30 MeV have been measured at the PHELIX laser. Because of the laser-plasma interactions at a power density of about 4×10^{19} W/cm^{2}, a total yield of 1.5×10^{13} protons was produced. For the reference energy o
Externí odkaz:
https://doaj.org/article/8a560c745f5f4c6a8ba7b7de58ea9c07
Autor:
G. Franchetti, O. Chorniy, I. Hofmann, W. Bayer, F. Becker, P. Forck, T. Giacomini, M. Kirk, T. Mohite, C. Omet, A. Parfenova, P. Schütt
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 13, Iss 11, p 114203 (2010)
Trapping of particles in nonlinear resonances in the presence of space charge and synchrotron motion may be a source of beam halo generation and beam loss in high intensity synchrotrons, in particular for extended storage times at the injection plate
Externí odkaz:
https://doaj.org/article/f938cff98b554dcbbf41cf4ff8e5a4fd
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 12, Iss 12, p 124401 (2009)
Trapping by resonances or scattering off resonances induced by space charge (SC) or electron cloud (EC) in conjunction with synchrotron motion can explain observations of slow beam loss and emittance growth, which are often accompanied by changes in
Externí odkaz:
https://doaj.org/article/2ce5b012f5a147a4bc530621cd226d80
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 11, Iss 9, p 094001 (2008)
In this paper we present a method for measuring the nonlinear errors in a circular accelerator by taking advantage of the feed-down effect of high order multipoles when the closed orbit is globally deformed. We devise a nonlinear tune response matrix
Externí odkaz:
https://doaj.org/article/0c899e41b5a44a618a8182ab1f917d53
Autor:
L. Groening, W. Barth, W. Bayer, G. Clemente, L. Dahl, P. Forck, P. Gerhard, I. Hofmann, G. Riehl, S. Yaramyshev, D. Jeon, D. Uriot
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 11, Iss 9, p 094201 (2008)
Transverse emittance growth along the Alvarez drift tube linac (DTL) section is a major concern with respect to the preservation of beam quality of high current beams at the GSI UNILAC. In order to define measures to reduce this growth, appropriate t
Externí odkaz:
https://doaj.org/article/627664839b7c4c2eadaf88df219c3cb8
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 11, Iss 1, p 014201 (2008)
The influence of the nonlinear space-charge force, which causes an amplitude-dependent tune shift, on the transverse stability of a coasting beam with impedances is investigated. In particular, the interplay of nonlinear space charge with a cubic lat
Externí odkaz:
https://doaj.org/article/789800f5dddf43389fb5321ffc41c482
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 10, Iss 6, p 064401 (2007)
Using field matching techniques, closed form analytic expressions for the transverse impedance and for the shielding effectiveness of a smooth cylindrical beam pipe of arbitrary thickness are presented. In the limit of thick and thin beam pipes the w
Externí odkaz:
https://doaj.org/article/82db2b51aa9f4f9fb03ffbdc10d703db