The Ions for the LHC Project / <blink>Place: AB Auditorium, Prévessin, bldg. 864</blink>

by Karl-Heinz Schindl and John Jowett (CERN)

Thursday 13 May 2004, 11:00 → 12:00 Europe/Zurich

864-AB Auditorium- (CERN)

A sizeable part of the LHC physics programme will consist of collisions between lead ions at a design luminosity of 10²⁷ cm-2 s-1. These will be achieved after an upgrade of the ion injector chain comprising the Linac3, LEIR, PS and SPS machines. Central to the scheme is the Low Energy Ion Ring (LEIR), which transforms long ion pulses from Linac3 to high-brilliance bunches by accumulation and electron cooling, requiring an ultra-high vacuum of a few 10^-12 mbar. The talk covers the overall injection scheme for lead ions together with major hardware changes. The performance of the LHC as a lead-ion collider is limited by a diverse range of phenomena that are often qualitatively different from those anticipated with protons. Compared with earlier heavy-ion machines the LHC also enters a new regime in several ways. Ion loss mechanisms notably include nuclear electromagnetic processes in the colliding beams. Losses limit luminosity because they directly affect elements of the beam environment such as superconducting magnets and the beam collimation system. The beam emittances will evolve under the influence of intra-beam scattering, radiation damping and interaction with the residual gas. Both losses and emittance growth contribute to the decay of luminosity during a store.

Organiser(s): Werner Herr (AB/ABP)
More information: http://cern.ch/AB-seminar/

more information more information