BE Seminar

Stabilization of nanometre-size particle beams in the final focus system of the Compact LInear Collider (CLIC)

Name: Stabilization of nanometre-size particle beams in the final focus system of the Compact LInear Collider (CLIC)
Start: 2004-02-26T11:00:00+01:00
End: 2004-02-26T12:00:00+01:00
Location: CERN

by Stefano Redaelli (CERN-AB)

Thursday 26 Feb 2004, 11:00 → 12:00 Europe/Zurich

PS Auditorium (CERN)

PS Auditorium

CERN

Description

The Compact LInear Collider (CLIC) study at the European Organization for Nuclear Research (CERN) is developing the design of a 3 TeV e+e- linear collider. The discovery reach of this machine depends on obtaining a luminosity of 10³⁵ /cm²/s, which will be done by colliding beams with transverse spot sizes in the nanometer range ( 60x0.7 nm²). Tolerances on fast mechanical stability reach the 0.2 nm level. These tolerances have been considered as one of the major obstacles for building high energy e+e- linear colliders. This serious concern has been addressed by building a CERN test stand on magnet stability, bringing together state-of-the-art stabilization technology, latest equipment for vibration measurements and realistic magnet prototypes. For the first time an accelerator magnet was successfully stabilized to the sub-nanometer level. The best measurements indicate transverse RMS vibration amplitudes (above 4 Hz) of (0.79 +/-0.08) nm horizontally and (0.43 +/-0.04) nm vertically, maintained to a maximum of less than (1.47 +/-0.15) nm and (1.00 +/-0.10) nm, respectively, over a period of several days. Detailed simulations have been used to predict the achievable luminosity of the collider based on a realistic stability model. This set-up includes a 3D beam transport, a full dynamical 2D model of transverse magnet vibrations (fully based on measured spectra of stabilized magnets), a beam-based position feedback and a complete model of the beam-beam interaction. The numerical simulation predicts that approximately 70 % of the CLIC goal luminosity can be achieved with the demonstrated performance in the CERN test stand. This indicates the basic feasibility of the nanometer-size colliding beams foreseen in the CLIC concept.

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