DocumentCode :
1983012
Title :
First experience with colliding electron-proton beams in HERA
Author :
Brinkmann, R. ; Willeke, F.
Author_Institution :
DESY, Hamburg, Germany
fYear :
1993
fDate :
17-20 May 1993
Firstpage :
3742
Abstract :
We report on first experience with colliding electron and proton beams in HERA. In 1992, the first year of operation, HERA has delivered some 60(nb)-1 of e-p luminosity to the experiments H1 and ZEUS. The beam energies amounted to 26 GeV and 820 GeV. A maximum luminosity of 2.2×1029 cm-2 s-1 has been achieved by colliding a train of nine electron bunches against nine proton bunches. A complete collection of data is contained in a reference. The beams could be brought into and held in collision without problems. The lifetime of the proton beam in collision is as long as 50h. This requires both careful matching of the electron and proton beam cross sections and also that the two orbits coincide within ≃0.2σ beam size at the interaction point. The proton beam suffered a beam-beam tune shift of up to ΔQx≃0.0018. This is close to the limit which was assumed in the design of HERA. Nonetheless, there is only little degradation in the proton beam quality in collision. Under these conditions, the proton beam fills could be stored and be made available for collision for some 24 h in HERA
Keywords :
beam handling techniques; electron accelerators; electron beams; proton accelerators; storage rings; tuning; 24 h; 26 GeV; 50 h; 820 GeV; H1 experiment; HERA experiment; ZEUS; beam cross sections; beam-beam tune shift; colliding electron-proton beams; electron bunches; interaction point; maximum luminosity; proton beam fills; proton beam lifetime; proton beam quality degradation; proton bunches; Degradation; Electron beams; Orbits; Particle beams; Production; Protons; Stability; Storage rings; Synchrotrons; Testing;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Particle Accelerator Conference, 1993., Proceedings of the 1993
Conference_Location :
Washington, DC
Print_ISBN :
0-7803-1203-1
Type :
conf
DOI :
10.1109/PAC.1993.309774
Filename :
309774
Link To Document :
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