O. Napoly
French Alternative Energies and Atomic Energy Commission
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Featured researches published by O. Napoly.
ieee particle accelerator conference | 2007
O. Napoly; O. Delferriere; M. Durante; Jacques Payet; C. Rippon; D. Uriot; B. Balhan; Jan Borburgh; B. Goddard; S. Kuroda; Yoshihisa Iwashita; M. del Carmen Alabau; P. Bambade; J. Brossard; O. Dadoun; C. Rimbault; G. Sabbi; L. Keller; D. Angal-Kalinin; F. Jackson; S. Tzenov; R. Appleby
An interaction region with head-on collisions is considered as an alternative to the baseline ILC configuration. Progress in the final focus optics design includes engineered large bore superconducting final doublet magnets and their 3D magnetic integration in the detector solenoids. Progress on the beam separation optics is based on technical designs of electrostatic separator and special extraction quadrupoles. The spent beam extraction is realized by a staged collimation scheme relying on realistic collimators.
ieee particle accelerator conference | 2007
J. Brossard; P. Bambade; T. Derrien; O. Napoly; Jacques Payet; M.C. Alabau; D. Angal-Kalinin
An interaction region with head-on collisions is being developed for the ILC as an alternative to the base line 14 mrad crossing angle design, motivated by simpler beam manipulations upstream of the interaction point (IP) and a more favourable configuration for the detector and physics analysis. The design of the post-collision beam line in this scheme involves however a number of technological challenges, one of which is the strength requirement for the electrostatic separators (ES) placed immediately after the final doublet to extract the spent beam. In this paper, we examine in detail the main mechanism behind this requirement, the multi-beam kink instability, which results from the long-range beam-beam forces at the parasitic crossings after the bunches have been extracted. Our analysis uses realistic bunch distributions, the Guinea-Pig program to treat beam-beam effects at the interaction point and the DIMAD program to track the disrupted beam distributions in the post- collision beam line.
ieee particle accelerator conference | 2005
Shunsuke Araki; H. Hayano; Yu Higashi; Y. Honda; Kenji Kanazawa; Koichi Kubo; Tsuyoshi Kume; M. Kuriki; Sho Kuroda; M. Masuzawa; Tomoyuki Naito; T. Okugi; R. Sugahara; Tatsuro Takahashi; T. Tauchi; Nobuhiro Terunuma; N. Toge; J. Urakawa; V. Vogel; Hiroshi Yamaoka; K. Yokoya; J. Gao; Wenxin Liu; Guanhong Pei; Jiacheng Wang; B. Grishanov; P. Logachev; F. Podgorny; Valery I. Telnov; D. Angal-Kalinin
To reach design luminosity, the International Linear Collider (ILC) must be able to create and reliably maintain nanometer size beams. The ATF damping ring is the unique facility where ILC emittances are possible. In this paper we present and evaluate the proposal to create a final focus facility at the ATF which, using compact final focus optics and an ILC-like bunch train, would be capable of achieving 37 nm beam size. Such a facility would enable the development of beam diagnostics and tuning methods, as well as the training of young accelerator physicists.
BEAM HALO DYNAMICS, DIAGNOSTICS, AND COLLIMATION: 29th ICFA Advanced Beam Dynamics Workshop on Beam Halo Dynamics, Diagnostics, and Collimation HALO'03 | 2003
Alexandr Drozhdin; G.A. Blair; L. Keller; W. Kozanecki; T. Markiewicz; T. Maruyama; N. Mokhov; O. Napoly; T. Raubenheimer; Daniel Schulte; Andrei Seryi; P. Tenenbaum; N. Walker; M. Woodley; F. Zimmermann
This report briefly describes studies performed in the framework of the Collimation Task Force organized to support the work of the second International Linear Collider Technical Review Committee. The post‐linac beam‐collimation systems in the TESLA, JLC/NLC and CLIC linear‐collider designs are compared using the same computer code under the same assumptions. Their performance is quantified in terms of beam‐halo and synchrotron‐radiation collimation efficiency. The performance of the current designs varies across projects, and does not always meet the original design goals. But these comparisons suggest that achieving the required performance in a future linear collider is feasible. Further work of the group is briefly described as well.