CERN Accelerating science

CERN Document Server 5 registres trobats  La cerca s'ha fet en 0.57 segons. 
1.
Racetrack Fixed Field Accelerator with pulsed quadrupoles for variable energy extraction / Haj Tahar, Malek (CERN) ; Brenner, David J. (Columbia U. (main)) ; Randers-Pehrson, Gerhard (Columbia U. (main))
In this paper, a novel concept combining a fixed field alternating gradient accelerator with time-varying quadrupoles is presented which solves some of the major problems of conventional fixed field accelerators. [...]
arXiv:1801.04188.
- 9 p.
Fulltext
2.
Systematic Errors of a ”frozen Spin” EDM measurement with electric and magnetic Fields due to imperfect Alignment of Fields / Cilento, Vera (CERN) ; Carli, Christian (CERN) ; Haj Tahar, Malek (CERN)
Many of the rings proposed to measure the Electric Dipole Moment (EDM) of charged particles rely on a combination of magnetic and electric fields bending the beam to fulfil the ”frozen spin” condition. Imperfect alignment of the two fields bending the beam is known to rotate the spin from the longitudinal into the vertical direction. [...]
CERN-PBC-Notes-2023-009.- Geneva : CERN, 28 - 15. Fulltext: PDF;
3.
Geometric phase effect study in electric dipole moment rings / Carli, Christian (CERN) ; Haj Tahar, Malek (CERN)
Several proposals to measure a possible small electric dipole moment (EDM) of charged particles aligned with the spin and the well-known magnetic dipole moment (MDM) are based on the concept to circulate bunches with an initial polarization in the horizontal plane and to observe the buildup of a vertical spin component caused by the EDM. Most proposals aim at operating the ring with “frozen spin,” such that, with an MDM only, the spin remains aligned with the trajectory. [...]
2022 - 10 p. - Published in : Phys. Rev. Accel. Beams 25 (2022) 064001 Fulltext: PDF;
4.
Systematic Effects Limiting the Sensitivity of "Magic Energy" Proton EDM Rings / Carli, Christian (CERN) ; Haj Tahar, Malek (CERN ; PSI, Villigen)
Proposals to measure a possible Electric Dipole Moment (EDM) of protons in an electro-static storage ring are studied by a world-wide community. The machine is operated at the so-called "magic energy" to satisfy the "frozen spin" condition such that, without imperfections and with the well known magnetic moment of the particle, the spin is always oriented parallel to the direction of movement. [...]
JACoW, 2021 - 4 p. - Published in : JACoW IPAC 2021 (2021) 602-605 Fulltext: PDF;
In : 12th International Particle Accelerator Conference (IPAC 2021), Online, 24 - 28 May 2021, pp.602-605
5.
Tune compensation in nearly scaling fixed field alternating gradient accelerators / Haj Tahar, Malek (CERN) ; Méot, François (BNL, C-A Dept.)
In this paper, we investigate the stability of the particle trajectories in Fixed Field Alternating Gradient (FFAG) accelerators in the presence of field errors: The emphasis is on the scaling FFAG type: a collaboration work is on-going in view of better understanding the properties of the 150 MeV scaling FFAG at KURRI in Japan, and progress towards high intensity operation. Analysis of certain types of field imperfections revealed some interesting features about this machine that explain some of the experimental results and generalize the concept of a scaling FFAG to a non-scaling one for which the tune variations obey a well defined law. [...]
arXiv:1710.08772.- 2020-05-23 - 22 p. - Published in : Phys. Rev. Accel. Beams 23 (2020) 054003 Fulltext from Publisher: PDF; Preprint: PDF;

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