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Resistive Wall Instability in the Drive Beam Formation system

Resistive Wall Instability in the Drive Beam Formation system. B. Jeanneret CLIC Beam Dyn Meeting 10 March 2010. Basics. Amplitude or emmitance growth : . P roblem : train 240 ns long and I = 100 A Need Copper chamber ( high conductivity ) Large radius magnet cost

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Resistive Wall Instability in the Drive Beam Formation system

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  1. Resistive Wall Instability in the Drive Beam Formation system B. Jeanneret CLIC Beam Dyn Meeting 10 March 2010

  2. Basics Amplitude or emmitancegrowth : • Problem : train 240 ns long and I = 100 A • Need • Copper chamber (highconductivity) • Large radius • magnetcost • Power , estimatedcrudely ~ 100 MW @ 3TeV CLIC • 48 TA  1st candidate for economies • Look at variable radius in TA

  3. Results I adjustedflatlya_FM+TA to keep in tolerance Now look at variable a_TA, kkeping the rest as before • Vacuum chamber radius • FM : a = 40 mm • LTL : a = 100 mm • TA : variable This for CO_error , rms 1mm Twice more withVac_chambererrors Not somuch to gain for power w/o loosingmuch for emitgrowth

  4. Alternative • From discussion with M. Modena & D. Tommasini • Considersuper-ferricmagnets • Power P  P/5 or P/10 • Option : cold pipe as wellhighcondsmall radius • CSR cancelled • Allows for longer dipoleslimited SR • Can beconsidered as well for FM • ProposedStrategy : • Keepwith warm magnet a = 40 mm as baseline for CDR • Mention sup-ferric as option, with a bit more precisionthanabove • Discuss the costdiffrential (CWG, …) SR & absorber

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