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CLIC Beam Physics Meeting
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Europe/Zurich
6/2-004 (CERN)
Description
Decelerator scenarios: magnet and powering
Minutes
Participants: E. Adli, B. Dalena, B. Jeanneret, J. Pfingstner, L. Rinolfi, D. Schulte, R. Corsini, I. Syratchev, M. Eduardo, J. Snuveink, A. Vivoli, M. Jonker, S. Pittet, D. Siemaszko, M. Modena, A ?, E. Marin Lacomba
Decelerator operation scenarios were presented by E. Adli (slides provided)
Comments on presentation:
20% overhead to baseline maximum gradient of 81.2 T/m are required due to phase-advance flexibility + flexibility of changing drive beam initial energy nominal working point
MM: we are already on the limit for 81.2 T/m, we can squeeze 10%, but not 20%. -> challenging.
Discussion: must try to negotiate more longitudinal space for quads (e.g. will depend on BPM design).
Tune-up simulations shows that no significant improvement of initial envelope is found by reducing nominal below 80% of nominal. Simulations were done with 20 um rms quadrupole misalignment.
Consensus to allow for up to ~30% of the initial gradient at the end of the lattice
RC: suggests tp redo simulations with 50 um rms misalignment
Low energy running: DS: might be a bit excessive to require both 70% for low-energy running and 70% of that for lower phase-advance for such a run -> we go for 70% lower limit as requirement for now.
Simulations results of two-magnets serial scenario was shown; negligible impact at start of lattice, large impact toward end.
Common agreement to string two magnets at the 30% first part of the lattice.
Trimming opportunities of magnets:
a rough estimate from power group: ~1A in return line will be small enough to reduce cable cost by a factor 5. To be figured out in more detail how many amps we can get for a single magnet, and subsequently the trimming flexibility for the magnets at the start of the lattice.
Some action items :
* Update and simplify scenario chart (EA)
* Redo tune-up simulations for 50 um quads (EA)
* Investiagate the possibilities of 20% extra gradent / longer quads (MM)
* Provide estimate on maximum current available for trimming (SP/DS)
* Investiage further single/multiple failures (SP/DS/EA/MJ)
* We will try to write down the most important information in a recommendation note by the 25th of March (EA will take initative to gather the information, and set-up the document frame). It will not be an attempt to document all the information arosen during the last weeks discussions, but should be enough to justify the recommendations.
EA, 3/3/2010
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