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Bartmann, W.

Paper Title Page
MOPD39 Considerations on a New Fast Extraction Kicker Concept for SPS 149
  • B. Goddard, M.J. Barnes, W. Bartmann
    CERN, Geneva

A new 450 GeV/c extraction kicker concept has been investigated for the SPS, based on open C-type kickers and a fast-bumper system. The beam is moved into the kicker gap only a few ms before extraction. The concept is illustrated in detail with the LSS4 extraction in the SPS – very similar parameters and considerations apply to the other fast extraction system in LSS6. A similar concept could also be conceived for injection but is more difficult due to the larger beam size. The technical issues are presented and the potential impact on the machine impedance is discussed.

MOPD48 Leakage from LHC Dump Protection System 176
  • C. Bracco, R.W. Assmann, W. Bartmann, C. Boucly, R. Bruce, E. Carlier, B. Dehning, B. Goddard, E.B. Holzer, M. Meddahi, A. Nordt, S. Redaelli, A. Rossi, M. Sapinski, J.A. Uythoven, D. Wollmann
    CERN, Geneva

A single-sided mobile diluter (TCDQ) and a horizontal secondary collimator(TCSG) are installed in the extraction region of the LHC to protect the downstream elements from damage in case of asynchronous beam dump. These collimators have to be precisely setup to shield the arc aperture at 450 GeV, the triplet apertures and the tungsten tertiary collimators (TCT) at the low-beta collision points. During the LHC beam commissioning, several machine protection tests were carried out to validate collimator setup and hierarchy at different beam energies and intensities. The outcomes of these measurements are presented in this paper together with the results of particle tracking simulations for asynchronous beam dump. These studies allowed to quantify the leakage expected from dump protection collimators to the downstream elements, and to validate the system performance towards higher beam intensity.

MOPD49 Protection of LHC Against Fast Failures During Injection and Beam Dump 180
  • B. Goddard, R.W. Assmann, W. Bartmann, C. Bracco, E. Carlier, V. Kain, M. Meddahi, A. Nordt, S. Redaelli, J.A. Uythoven, J. Wenninger
    CERN, Geneva

The LHC transfer lines, injection and beam dump systems are equipped with a series of active and passive protection systems. These are designed to prevent as many failures as possible, for example through surveillance and interlocking, or to absorb any beam which is mis-kicked or mis-steered on passive absorbers. The commissioning, validation tests and performance of the different systems are described, and the implications for the protection of the LHC against different failures during beam transfer are discussed.

MOPD51 Emittance Preservation at Injection into LHC 188
  • V. Kain, W. Bartmann, C. Bracco, B. Goddard, W. Höfle, D. Karadeniz, M. Meddahi, D. Valuch, J. Wenninger
    CERN, Geneva

The very demanding LHC beam parameters put very strict requirements on the beam quality along the SPS-to-LHC transfer. In particular, the budget for the emittance increase is very tight. During the LHC commissioning, the emittances have been measured in the SPS, the two SPS-to-LHC transfer lines and in the LHC. Preliminary results show the importance of a very well controlled beam steering in the transfer lines together with the need of a robust trajectory correction strategy in order to guarantee long-term reproducibility. Another source of emittance comes from the tilt mis¬match be¬tween the LHC and its trans¬fer lines which generates cou¬pling at in¬jec-tion into the LHC and in turn will contribute to emittance increase. Preliminary results are also discussed.

TUO2B05 Feasibility of 2 GeV Injection into the CERN PS 343
  • W. Bartmann, S. Aumon, B. Balhan, J. Borburgh, S.S. Gilardoni, B. Goddard, M. Hourican, L. Sermeus, R.R. Steerenberg
    CERN, Geneva

The increase of the extraction energy of the CERN PSB to 2 GeV has been suggested as a method to increase the intensity of the LHC beam which can be obtained from the present injector complex. Such a change would require a redesign of the present PS proton injection system, which is already operating close to its limits within tight space constraints. The feasibility of a 2 GeV proton injection is discussed and a potential solution outlined. The implications on the injection equipment and on the performance in terms of beam parameters and losses are discussed.


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