HB2014 - List of Authors (Meddahi, M.)

Paper

Title

Page

The High Luminosity Challenge: Potential and Limitations of High-Intensity High-Brightness Beams in the LHC and its Injectors

1

R. De Maria, G. Arduini, D. Banfi, J. Barranco, H. Bartosik, E. Benedetto, R. Bruce, O.S. Brüning, R. Calaga, F. Cerutti, H. Damerau, L.S. Esposito, S.D. Fartoukh, M. Fitterer, R. Garoby, S.S. Gilardoni, M. Giovannozzi, B. Goddard, B. Gorini, K. Hanke, G. Iadarola, M. Lamont, M. Meddahi, B. Mikulec, N. Mounet, E. Métral, Y. Papaphilippou, T. Pieloni, S. Redaelli, L. Rossi, G. Rumolo, E.N. Shaposhnikova, G. Sterbini, E. Todesco, R. Tomás, F. Zimmermann
CERN, Geneva, Switzerland
A. Valishev
Fermilab, Batavia, Illinois, USA

Funding: Research supported by EU FP7 HiLumi LHC - Grant Agreement 284404 and by DOE via the US-LARP program.
High-intensity and high-brightness beams are key ingredients to maximize the integrated luminosity of the LHC and exploit its full potential. This contribution will describe the optimization of the beam and machine parameters to maximize the integrated luminosity for the LHC experiments, by taking into account the expected intensity and brightness reach of the LHC and its injector chain and the capabilities of the detectors for the next run and foreseen upgrade scenarios.

Slides MOXLR01 [2.574 MB]

WEO4AB02

New PSB H⁻ Injection and 2 GeV Transfer to the CERN PS

320

W. Bartmann, J.L. Abelleira, B. Balhan, E. Benedetto, J. Borburgh, C. Bracco, C. Carli, G.P. Di Giovanni, V. Forte, S.S. Gilardoni, B. Goddard, G. Gräwer, K. Hanke, M. Hourican, A. Huschauer, M. Meddahi, B. Mikulec, G. Rumolo, L. Sermeus, R. Steerenberg, G. Sterbini, Z. Szoke, R. Wasef, Y. Wei, W.J.M. Weterings
CERN, Geneva, Switzerland

At CERN Linac4 is being commissioned as first step in the LHC injector upgrade to provide 160 MeV H⁻ ions. In order to fully deploy its potential, the PSB conventional multiturn injection will be replaced by a charge exchange injection. An expected brightness improvement of about a factor 2 would then be difficult to digest at PS injection due to space charge. Therefore the transfer energy between PSB and PS will be increased at the same time from 1.4 to 2 GeV. This paper describes the new PSB injection system and the status of its test stand. Modifications of the PSB extraction and recombination septa and kickers in the transfer line are shown. A new focussing structure for the transfer lines to match the horizontal dispersion at PS injection and the design of a new eddy current septum for the PS injection are presented.

Slides WEO4AB02 [2.867 MB]

THO1LR01

Long-term Beam Losses in the CERN Injector Chain

325

S.S. Gilardoni, G. Arduini, H. Bartosik, E. Benedetto, H. Damerau, V. Forte, M. Giovannozzi, B. Goddard, S. Hancock, K. Hanke, A. Huschauer, M. Kowalska, M. McAteer, M. Meddahi, B. Mikulec, E. Métral, Y. Papaphilippou, G. Rumolo, E.N. Shaposhnikova, G. Sterbini, R. Wasef
CERN, Geneva, Switzerland

For the production of the LHC type beams, but also for the high intensity ones, the budget allocated to losses in the CERN injector chain is maintained as tight as possible, in particular to keep as low as possible the activation of the different machine elements. Various beam dynamics effects, like for example beam interaction with betatronic resonances, beam instabilities, but also reduced efficiency of the RF capture processes or RF noise, can produce losses even on a very long time scale. The main different mechanisms producing long term losses observed in the CERN injectors, and their cure or mitigation, will be revised.

Slides THO1LR01 [5.913 MB]

Paper	Title	Page
MOXLR01	The High Luminosity Challenge: Potential and Limitations of High-Intensity High-Brightness Beams in the LHC and its Injectors	1
	R. De Maria, G. Arduini, D. Banfi, J. Barranco, H. Bartosik, E. Benedetto, R. Bruce, O.S. Brüning, R. Calaga, F. Cerutti, H. Damerau, L.S. Esposito, S.D. Fartoukh, M. Fitterer, R. Garoby, S.S. Gilardoni, M. Giovannozzi, B. Goddard, B. Gorini, K. Hanke, G. Iadarola, M. Lamont, M. Meddahi, B. Mikulec, N. Mounet, E. Métral, Y. Papaphilippou, T. Pieloni, S. Redaelli, L. Rossi, G. Rumolo, E.N. Shaposhnikova, G. Sterbini, E. Todesco, R. Tomás, F. Zimmermann CERN, Geneva, Switzerland A. Valishev Fermilab, Batavia, Illinois, USA
	Funding: Research supported by EU FP7 HiLumi LHC - Grant Agreement 284404 and by DOE via the US-LARP program. High-intensity and high-brightness beams are key ingredients to maximize the integrated luminosity of the LHC and exploit its full potential. This contribution will describe the optimization of the beam and machine parameters to maximize the integrated luminosity for the LHC experiments, by taking into account the expected intensity and brightness reach of the LHC and its injector chain and the capabilities of the detectors for the next run and foreseen upgrade scenarios.
	Slides MOXLR01 [2.574 MB]

WEO4AB02	New PSB H⁻ Injection and 2 GeV Transfer to the CERN PS	320
	W. Bartmann, J.L. Abelleira, B. Balhan, E. Benedetto, J. Borburgh, C. Bracco, C. Carli, G.P. Di Giovanni, V. Forte, S.S. Gilardoni, B. Goddard, G. Gräwer, K. Hanke, M. Hourican, A. Huschauer, M. Meddahi, B. Mikulec, G. Rumolo, L. Sermeus, R. Steerenberg, G. Sterbini, Z. Szoke, R. Wasef, Y. Wei, W.J.M. Weterings CERN, Geneva, Switzerland
	At CERN Linac4 is being commissioned as first step in the LHC injector upgrade to provide 160 MeV H⁻ ions. In order to fully deploy its potential, the PSB conventional multiturn injection will be replaced by a charge exchange injection. An expected brightness improvement of about a factor 2 would then be difficult to digest at PS injection due to space charge. Therefore the transfer energy between PSB and PS will be increased at the same time from 1.4 to 2 GeV. This paper describes the new PSB injection system and the status of its test stand. Modifications of the PSB extraction and recombination septa and kickers in the transfer line are shown. A new focussing structure for the transfer lines to match the horizontal dispersion at PS injection and the design of a new eddy current septum for the PS injection are presented.
	Slides WEO4AB02 [2.867 MB]

THO1LR01	Long-term Beam Losses in the CERN Injector Chain	325
	S.S. Gilardoni, G. Arduini, H. Bartosik, E. Benedetto, H. Damerau, V. Forte, M. Giovannozzi, B. Goddard, S. Hancock, K. Hanke, A. Huschauer, M. Kowalska, M. McAteer, M. Meddahi, B. Mikulec, E. Métral, Y. Papaphilippou, G. Rumolo, E.N. Shaposhnikova, G. Sterbini, R. Wasef CERN, Geneva, Switzerland
	For the production of the LHC type beams, but also for the high intensity ones, the budget allocated to losses in the CERN injector chain is maintained as tight as possible, in particular to keep as low as possible the activation of the different machine elements. Various beam dynamics effects, like for example beam interaction with betatronic resonances, beam instabilities, but also reduced efficiency of the RF capture processes or RF noise, can produce losses even on a very long time scale. The main different mechanisms producing long term losses observed in the CERN injectors, and their cure or mitigation, will be revised.
	Slides THO1LR01 [5.913 MB]