HB2014 - List of Authors (Borburgh, J.)

Paper

Title

Page

Progress in the Upgrade of the CERN PS Booster Recombination

24

J.L. Abelleira, W. Bartmann, J. Borburgh, E. Bravin, U. Raich
CERN, Geneva, Switzerland

The CERN PS Booster recombination lines (BT) will be upgraded following the extraction energy increase foreseen in 2018 and meant to reduce the direct space-charge tune shift in the PS injection for the future HL-LHC beams. Henceforth the main line elements, recombination septa, quadrupoles and dipoles must be scaled up to this energy. An increase in the beam rigidity by a factor 1.3 would require the same factor in the field integral of the septa, ∫Bdl, in order to bend the same angle and preserve the present recombination geometry, which is one of the main upgrade constraints. This paper describes the new optics, in particular in the new and longer septa. In addition we consider the upgrade of the so called BTM line that brings the beam to the external dump and where emittance measurements are taken thanks to three pairs of grids. The new proposed optics has also the advantage to simplify the design of the new dipoles. Here we study this new optics and the issues related to the emittance measurement at the new higher energy.

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]

Paper	Title	Page
MOPAB02	Progress in the Upgrade of the CERN PS Booster Recombination	24
	J.L. Abelleira, W. Bartmann, J. Borburgh, E. Bravin, U. Raich CERN, Geneva, Switzerland
	The CERN PS Booster recombination lines (BT) will be upgraded following the extraction energy increase foreseen in 2018 and meant to reduce the direct space-charge tune shift in the PS injection for the future HL-LHC beams. Henceforth the main line elements, recombination septa, quadrupoles and dipoles must be scaled up to this energy. An increase in the beam rigidity by a factor 1.3 would require the same factor in the field integral of the septa, ∫Bdl, in order to bend the same angle and preserve the present recombination geometry, which is one of the main upgrade constraints. This paper describes the new optics, in particular in the new and longer septa. In addition we consider the upgrade of the so called BTM line that brings the beam to the external dump and where emittance measurements are taken thanks to three pairs of grids. The new proposed optics has also the advantage to simplify the design of the new dipoles. Here we study this new optics and the issues related to the emittance measurement at the new higher energy.

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]