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Abstracts Brochure - CERN

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MOPLS — Poster Session 26-Jun-06 16:00 - 18:00<br />

to lead to a region of stable collision parameters. Beam and beamstrahlung photon losses are calculated along the<br />

extraction elements. Issues concerning the design of the large bore superconducting final focus magnets, common to<br />

both incoming and outgoing beams, are considered.<br />

Optimization of the e-e − Option at the ILC<br />

The e-e − running mode is one of the interesting<br />

physics options for the International<br />

Linear Collider. The luminosity for e-e − collisions<br />

is reduced by mutual defocusing due<br />

M. Alabau Pons, M. Alabau Pons, A. Faus-Golfe (IFIC) R. Appleby<br />

(UMAN) P. Bambade, X. Dadoun (LAL)<br />

to the strong electromagnetic fields that the bunches experience during collisions. The resulting beamstrahlung<br />

energy loss and beam-beam deflection angles as function of the vertical transverse offset are different compared to<br />

the e + e − collisions. In this paper, the dependence of these observables with the offset for different beam sizes has<br />

been analysed to optimize performances for the e-e − mode, taking into account the requirements of the beam-beam<br />

deflection based intra-train feedback system. A first study of the implications for the final focus and extraction line<br />

optics is also presented for the cases of the 2mrad and 20mrad ILC base line crossing angle geometries.<br />

Investigation of Multipole Errors on the Collimation Efficiency for the ILC Beam Delivery<br />

System<br />

The post-linac collimation system for the future<br />

International Linear Collider is required<br />

to reduce the beam halo by several orders of<br />

magnitude. Multi-stage collimation systems<br />

R. Amirikas, F. Poirier, N.J. Walker (DESY) G.A. Blair, J. Carter<br />

(Royal Holloway, University of London)<br />

are required, whose overall efficiency relies on the optical transfer between them. High-order multipole errors, which<br />

are generally insignificant for the ultra-small emittance core of the beam, can strongly influence the halo particles at<br />

many beam sigma, opening up ’holes’ in the collimation system and reducing the efficiency. We present simulations<br />

of these errors using the GEANT4-based BDSIM code and a fast Monte Carlo scattering implementation in Merlin*.<br />

*http://www.desy.de/∼merlin<br />

Accelerator Component Vibration Studies and Tools<br />

This talk will cover a research program on<br />

accelerator component vibrations. Ground R. Amirikas, A. Bertolini, W. Bialowons, H. Ehrlichmann (DESY)<br />

motion and technical noise, such as vacuum<br />

and refrigeration systems, couple to the beam, mainly via quadrupoles, making the design of their supports, especially,<br />

in the case of the superconducting magnets, critical. This program includes investigation of cold mass vibration of<br />

the superconducting quadrupoles inside an accelerating module and sensor performance in the main or fringe field<br />

of a linear collider detector. Seismometer accuracy limitations in correlated ground motion measurements are also<br />

being investigated.<br />

125<br />

MOPLS061<br />

MOPLS062<br />

MOPLS063

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