Luminosity Scans at HERA

Hoffstaetter, G. H.

Report/Contribution to a conference proceedings

PUBDB-2016-04122

Luminosity Scans at HERA

Hoffstaetter, G. H. (Corresponding author)

2002

The 8th European Particle Accelerator Conference, EPAC2002, Paris, France, 3 Jun 2002 - 7 Jun 2002 404-406 (2002) [10.3204/PUBDB-2016-04122]

This record in other databases:

Please use a persistent id in citations: doi:10.3204/PUBDB-2016-04122

Report No.: DESY-M-02-01U

Abstract: As demonstrated in many accelerators, luminosity scanscan be used to measure the beam overlap integrals and todeduce the specific luminosity. In the electron–proton collider HERA these scans are performed by shifting the proton beam with respect to the lepton beam while recording the bremsstrahlung produced by the e/p collision. While the orbit of the 920GeV proton beam is not strongly affectedby the beam–beam kick, the effect on the 27.5GeV lepton beam is very significant. When a wire scanner is used to determine the proton beam size, the luminosity scan can be used to determine the lepton emittances. Furthermore information about the correlation of horizontal andvertical phase space can be obtained from luminosity scans. For this purpose three evaluation methods are derived, one of which is applicable for arbitrary bunch profiles. In the test phase of the HERA luminosity upgrade this feature was used to identify coupling as source for a reduced luminosity.

Keyword(s): talk: Paris 2002/06/03 ; electron p: storage ring ; beam monitoring: luminosity ; scattering: beam-beam ; bremsstrahlung ; beam emittance ; DESY HERA Stor