TASK OF WORKING PACKAGE 4 : CHOPPER
The next generation of high energy, high power proton accelerators must be designed for very low uncontrolled beam loss. In many cases, the beam from a linac is injected into a synchrotron, an accumulator or a compressor ring, and subsequently extracted. Unless suitable measures are taken to control the dynamics of the beam, both processes can lead to considerable particle loss. Loss-free injection and longitudinal capture can be achieved if the linac bunches are precisely injected inside the synchrotron buckets and no particles end-up outside. Beam loss at extraction may be minimised by ensuring that no circulating beam coincides with the field rise-time of the extraction magnet. These demands may be met by selective elimination of sets of bunches in the low energy stages of the linac by using a fast deflector or “beam chopper”. The field should rise and fall between the beam bunch interval, so that no partially chopped bunches remain in the machine, and this usually has to be within a period of the order of 2 ns.
Working Package Coordinator : Alessandra Lombardi (CERN)
Participating Institutions : CERN, RAL, CEA and LPSC
MEETINGS , MINUTES, AND RELEVANT EVENTS.
· Presentation of WP4 , Nov 03 at CERN
· First annual meeting of WP4, May 04 at CERN
Programme (you can download the talks from this page)
Highlights and goals for the next year
· Second annual meeting of WP4, Apr05 at RAL
· Third annual meeting of WP4, May06 at CERN
· Fourth annual meeting of WP4, June07 at CERN
Summary of the discussion
for WP4 Alessandra.Lombardi@cern.ch
for WEB page Beatrice.Hadorn@cern.ch