Zobrazeno 1 - 10
of 28
pro vyhledávání: '"V. H. Ranjbar"'
Autor:
V. H. Ranjbar
Publikováno v:
Physical Review Accelerators and Beams, Vol 26, Iss 6, p 061001 (2023)
We show how to construct an accelerator lattice cell that minimizes all intrinsic spin resonances. We then apply this approach to various toy electron and proton accelerators, considering, AGS-booster, AGS-like and CEPC/FCC-ee, and FCC-hh-like rings.
Externí odkaz:
https://doaj.org/article/9c58e789716f4adea582a52951ace10c
Autor:
V. H. Ranjbar
Publikováno v:
Physical Review Accelerators and Beams, Vol 22, Iss 9, p 091001 (2019)
It was observed at the Relativistic Heavy Ion Collider that the polarization of the stored beam decays by 0.17 to 3% per hour. This effect could not be simulated up to now since the simulation time for an exact calculation exceeded the computer capac
Externí odkaz:
https://doaj.org/article/11ee65b4fd934bf9bd8073e8d8938e82
Autor:
V. H. Ranjbar, M. Blaskiewicz, F. Méot, C. Montag, S. Tepikian, S. Brooks, H. Witte, I. Marneris, V. Ptitsyn, F. J. Willeke
Publikováno v:
Physical Review Accelerators and Beams, Vol 21, Iss 11, p 111003 (2018)
We have developed an intrinsic resonance free circular electron accelerator. This lattice could be placed in the existing RHIC tunnel and accelerate electrons from 400 MeV to 18 GeV avoiding all major polarization loss usual in such machines.
Externí odkaz:
https://doaj.org/article/cbd0d6f820d04ce1995ed8d86120a357
Publikováno v:
Physical Review Accelerators and Beams, Vol 19, Iss 10, p 101002 (2016)
Depolarization response for a system of two orthogonal snakes at irrational tunes is studied in depth using lattice independent spin integration. In particular we consider the effect of overlapping spin resonances in this system, to understand the im
Externí odkaz:
https://doaj.org/article/0b853ee441304ade9e057e645e665efc
Autor:
V. H. Ranjbar
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 18, Iss 1, p 014001 (2015)
Solutions to the Thomas-Bargmann-Michel-Telegdi spin equation for spin 1/2 particles have to date been confined to the single-resonance crossing. However, in reality, most cases of interest concern the overlapping of several resonances. While there h
Externí odkaz:
https://doaj.org/article/eb39dd38f3954b96a07d7aad07e7fd49
Autor:
E. Cormier-Michel, V. H. Ranjbar, D. L. Bruhwiler, J. R. Cary, M. Chen, C. G. R. Geddes, G. R. Plateau, N. H. Matlis, W. P. Leemans
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 17, Iss 9, p 091301 (2014)
Laser plasma based accelerators have the potential to reduce dramatically the size and cost of future particle colliders and light sources. Production of high quality beams along with reproducibility, tunability, and efficiency are required for many
Externí odkaz:
https://doaj.org/article/68111504bd6c46bea6e9723bab14bceb
Autor:
V. H. Ranjbar, C. Y. Tan
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 14, Iss 8, p 082802 (2011)
The combined effect of impedance and higher order chromaticity can act on the beam in a nontrivial manner which can cause a tune shift which depends on the relative momenta with respect to the “on momentum” particle (Δp/p). Experimentally, this
Externí odkaz:
https://doaj.org/article/142ee3ea91364248ad3dccd0ce33de18
Autor:
V. H. Ranjbar, P. Ivanov
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 11, Iss 8, p 084401 (2008)
The transverse turn-by-turn evolution of a bunch slice after an impulse kick is examined considering chromatic and impedance effects. It is found that by fitting the envelope of the beam slice motion to simulated data the strength of the resistive wa
Externí odkaz:
https://doaj.org/article/d308cb5113dd459eb5ccddee17ae1c94
Autor:
C. Y. Tan, V. H. Ranjbar
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 11, Iss 3, p 032802 (2008)
We will explore a method for measuring chromaticity by continuously kicking the beam transversely. This is called the continuous head-tail method for measuring chromaticity. The complete analytic approximation in terms of trigonometric functions is d
Externí odkaz:
https://doaj.org/article/83a780f1f1b74da58bc3da55d57a0339
Autor:
V. H. Ranjbar, S. Y. Lee, L. Ahrens, M. Bai, K. Brown, W. Glenn, H. Huang, A. Luccio, W. W. MacKay, V. Ptitsyn, T. Roser, N. Tsoupas
Publikováno v:
Physical Review Special Topics. Accelerators and Beams, Vol 7, Iss 5, p 051001 (2004)
A spin matching method to cure intrinsic coupled spin resonances in the AGS is proposed and explored using an extension of the existing DEPOL program algorithm. The extension of DEPOL to handle linear coupling in the polarized beam acceleration is do
Externí odkaz:
https://doaj.org/article/7f762fc4c4ef49daa9eb58a90bdaf6be