HB2014 - List of Authors (Forte, V.)

Paper

Title

Page

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]

THO4LR05

Transverse Emittance Preservation Studies for the CERN PS Booster Upgrade

428

E. Benedetto, C. Bracco, V. Forte, B. Mikulec, V. Raginel, G. Rumolo
CERN, Geneva, Switzerland
V. Forte
Université Blaise Pascal, Clermont-Ferrand, France

As part of the LHC Injectors Upgrade Project, the CERN PS Booster will undergo an ambitious upgrade program which includes the increase of injection energy from 50 MeV to 160 MeV and the implementation of an H⁻ charge-exchange injection from the new Linac4. Compared to rings characterized by similar space-charge tune spreads (about 0.5 at low energy), the peculiarity of the PSB is the small transverse emittance that needs to be preserved in order to provide high brightness beams to the LHC. We here try to identify what is the minimum emittance that can be achieved for a given intensity, via measurements, scaling estimates and simulation studies. The latest are based on our best knowledge of the optics model and take into account known perturbations such as the one induced by the short and fast ramping chicane injection magnets.

Slides THO4LR05 [1.122 MB]

THO4LR05

Transverse Emittance Preservation Studies for the CERN PS Booster Upgrade

428

E. Benedetto, C. Bracco, V. Forte, B. Mikulec, V. Raginel, G. Rumolo
CERN, Geneva, Switzerland
V. Forte
Université Blaise Pascal, Clermont-Ferrand, France

As part of the LHC Injectors Upgrade Project, the CERN PS Booster will undergo an ambitious upgrade program which includes the increase of injection energy from 50 MeV to 160 MeV and the implementation of an H⁻ charge-exchange injection from the new Linac4. Compared to rings characterized by similar space-charge tune spreads (about 0.5 at low energy), the peculiarity of the PSB is the small transverse emittance that needs to be preserved in order to provide high brightness beams to the LHC. We here try to identify what is the minimum emittance that can be achieved for a given intensity, via measurements, scaling estimates and simulation studies. The latest are based on our best knowledge of the optics model and take into account known perturbations such as the one induced by the short and fast ramping chicane injection magnets.

Slides THO4LR05 [1.122 MB]

Paper	Title	Page
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]

THO4LR05	Transverse Emittance Preservation Studies for the CERN PS Booster Upgrade	428
	E. Benedetto, C. Bracco, V. Forte, B. Mikulec, V. Raginel, G. Rumolo CERN, Geneva, Switzerland V. Forte Université Blaise Pascal, Clermont-Ferrand, France
	As part of the LHC Injectors Upgrade Project, the CERN PS Booster will undergo an ambitious upgrade program which includes the increase of injection energy from 50 MeV to 160 MeV and the implementation of an H⁻ charge-exchange injection from the new Linac4. Compared to rings characterized by similar space-charge tune spreads (about 0.5 at low energy), the peculiarity of the PSB is the small transverse emittance that needs to be preserved in order to provide high brightness beams to the LHC. We here try to identify what is the minimum emittance that can be achieved for a given intensity, via measurements, scaling estimates and simulation studies. The latest are based on our best knowledge of the optics model and take into account known perturbations such as the one induced by the short and fast ramping chicane injection magnets.
	Slides THO4LR05 [1.122 MB]

THO4LR05	Transverse Emittance Preservation Studies for the CERN PS Booster Upgrade	428
	E. Benedetto, C. Bracco, V. Forte, B. Mikulec, V. Raginel, G. Rumolo CERN, Geneva, Switzerland V. Forte Université Blaise Pascal, Clermont-Ferrand, France
	As part of the LHC Injectors Upgrade Project, the CERN PS Booster will undergo an ambitious upgrade program which includes the increase of injection energy from 50 MeV to 160 MeV and the implementation of an H⁻ charge-exchange injection from the new Linac4. Compared to rings characterized by similar space-charge tune spreads (about 0.5 at low energy), the peculiarity of the PSB is the small transverse emittance that needs to be preserved in order to provide high brightness beams to the LHC. We here try to identify what is the minimum emittance that can be achieved for a given intensity, via measurements, scaling estimates and simulation studies. The latest are based on our best knowledge of the optics model and take into account known perturbations such as the one induced by the short and fast ramping chicane injection magnets.
	Slides THO4LR05 [1.122 MB]