Bruce, R., Bocian, D., Gilardoni, S., Jowett, J. M.
Electromagnetic interactions between colliding heavy ions at the Large Hadron Collider (LHC) at CERN will give rise to localized beam losses that may quench superconducting magnets, apart from...
Measurements of heavy ion beam losses from collimation (2009)
Bruce, R., Assmann, R. W., Bellodi, G., Bracco, C., Braun, H. H., Gilardoni, S., ...
The collimation efficiency for Pb ion beams in the LHC is predicted to be lower than requirements. Nuclear fragmentation and electromagnetic dissociation in the primary collimators create fragments...
First observations of beam losses due to bound-free pair production in a heavy-ion collider (2008)
Bruce, R., Jowett, J.M., Gilardoni, S., Drees, A., Fischer, W., Tepikian, S., ...
We report the first observations of beam losses due to bound-free pair production at the interaction point of a heavy-ion collider. This process is expected to be a major luminosity limit for the...
IONS FOR LHC: STATUS OF THE INJECTOR CHAIN (2008)
D. Manglunki, A. Beuret, J. Borburgh, Ch. Carli, M. Chanel, L. Dumas, ...
The LHC will, in addition to proton runs, be operated with Pb ions and provide collisions at energies of 5.5 TeV per nucleon pair, i.e. more than 1.1 PeV per event, to experiments. The transformation...
THE LHC LEAD INJECTOR CHAIN (2008)
A. Beuret, J. Borburgh, A. Blas, H. Burkhardt, C. Carli, M. Chanel, ...
A sizeable part of the LHC physics programme foresees lead-lead collisions with a design luminosity of 10 27 cm-2 s-1. This will be achieved after an upgrade of the ion injector chain comprising...
August 2008IONS FOR LHC: TOWARDS COMPLETION OF THE INJECTOR CHAIN (2008)
J. M. Jowett, V. Kain, D. Küchler, M. Martini, S. Maury, E. Métral, ...
The commissioning of CERN’s ion injector complex [1] to allow 1.1 PeV collisions of ions in LHC is well under way. After the Low Energy Ion Ring (LEIR) in 2005 [2] and the Proton Synchrotron (PS)...
Horizontally Separated Encounters in the Middle of the Arcs (2007)
Introduction Although the single bunchintensity has not been an important limit in the present pretzel operation of LEP---the intensities available at injection in 1993 were more than could be put...
Commissioning and Operation of the LEP Pretzel Scheme (2007)
R. Bailey, J.M. Jowett, W. Kalbreier, D. Wang
From its start-up in 1989, LEP ran, as designed, with 4 bunches per beam and #at orbits. After 4 days of commissioning activity in October 1992, the regular mode of operation became 8 bunches per...
It Was Planned, H. Burkhardt, J. M. Jowett, I. Reichel, G. Von
mp and squeeze (# # x =2m,# # y = 5cm, f0520b98 v1 optics) the total RF voltage was reduced to 374 MV with q s # 0:074 (hardly visible) and an expected bucket half height of 2.25 %. Collimators were...
Presentation 1 DYNAMIC APERTURE FOR LEP: Physics and Calculations (2007)
Introduction In the past year our understanding of the physical phenomena determining the dynamic aperture of LEP has evolved considerably. New physics has been introduced in our model of the single...
More Bunches with Pretzel (2007)
LEP has run successfully for almost a whole year with the 8-bunch pretzel scheme. The luminosity has been substantially higher than could be obtained with 4 bunches and flat orbits. The basic...
Vertical Beamsize (and Other Calculations) In Various Optics (2007)
Jowett Accelerator Physics, J. M. Jowett, Accelerator Physics Group, Sl Division
LEP's optical configurations are subjected to a lengthy evaluation procedure which tries to model the imperfect machine with the conditions and corrections applied in operation. The physical...
First observations of beam losses due to bound-free pair production in a heavy-ion collider (2007)
Bruce, R., Drees, A., Fischer, W., Gilardoni, S., Jowett, J. M., Klein, S. R., ...
We report the first observations of beam losses due to bound-free pair production at the interaction point of a heavy-ion collider. This process is expected to be a major luminosity limit for the...
The Dynamic Aperture Of Lep At High Energy (1996)
Jowett Alexahin Ruggiero, J. M. Jowett, Y. Alexahin, F. Ruggiero, S. Tredwell Y
At the highest operating energies of LEP, the beam occupies a large phase space volume (emittances) because of the strong synchrotron radiation effects. The stable phase space volume required is...
Particle Dynamics in LEP at Very High Energy (1994)
F. Barbarin, F.C. Iselin, J.M. Jowett
As the beam energy of LEP is increased up to 90 GeV #LEP2# and beyond, the single-particle dynamics is ever more strongly in#uenced by the emission of synchrotron radiation. The program MAD has...