Drive Beam Complex : Work Package BPH-DRV B. Jeanneret LCWS11, Granada, September 2011 CLIC Drive Beam WP, BJ, LCWS111

BPH-DRVPurpose/Objectives/GoalsDeliverablesSchedule Optics designProvide optimized arc and combiner ring optics Provide design of satellite removal for thermionic injector Phase stability study Explore photo injector as alternative Improve drive beam linac optics Provide baseline design of extraction line Design, Reports, Tuning procedure Imperfections and correction techniques - Beam-based alignment studies - Develop feedback against beam phase and amplitude jitter - Study operation of drive beam linac with klystron/modulator failures Design Model, reports Concept, report Performance studies Study the impact of SR and CSR on the beam Determine level of SR and CSR on the beam line components Improve design to mitigate SR and CSR effects report Evaluation of CTF3 performanceExperiments, reports Integrated studies Understand impact of tails in collaboration with two-beam accelerationCode, reports, conceptual design of collimation CLIC Drive Beam WP, BJ, LCWS112

Delay loop, Combiners rings : covered by Piotr & Caterina Satellites removal : BJ Photo-injector : is it still an option  question to Steffen DB Linac : Avni ? Still much work Optics designProvide optimized arc and combiner ring optics Provide design of satellite removal for thermionic injector Phase stability study Explore photo injector as alternative Improve drive beam linac optics Provide baseline design of extraction line Design, Reports, Tuning procedure Imperfections and correction techniques - Beam-based alignment studies - Develop feedback against beam phase and amplitude jitter - Study operation of drive beam linac with klystron/modulator failures Design Model, reports Concept, report To be linked to the above, as yet activity not started, no staff DB Linac is one the biggest system of CLIC – Need close collaboration with the RF*, Instrumentation, Electrical Eng., and vacuum Global FTE need to be evaluated, critical mass must be determined … … and granted, otherwise partial studies will not be convincing CLIC Drive Beam WP, BJ, LCWS113 *WP CTC-012

To be linked with WP CTF3-001 Consolidation & Upgrades Shall not be a ‘auditing activity’ of CTF3, rather a participation/coordination looking at CLIC needs vs. CTF3 potential and present limitations Performance studies Study the impact of SR and CSR on the beam Determine level of SR and CSR on the beam line components Improve design to mitigate SR and CSR effects report Evaluation of CTF3 performanceExperiments, reports SR : need collaboration with VAC team for its clean absorption – ~ 1kW of power on every dipole in CR – Thermal stress critical – Can degrade the vacuum much beyond the 1nT specification – Much work ahead CSR : see Caterina’s talk Linked collective effects : ion instabilities, resistive wall instablilities, geometrical wakes RF deflectors is a critical issue CLIC Drive Beam WP, BJ, LCWS11 4

Too large population in transverse tails : – Losses  radiation, loss of performance Too large population in longitudinal tails : – Loss of performance, losses as well Need integrated studies with WP BPH_ML Presntly : no staff Integrated studies Understand impact of tails in collaboration with two-beam accelerationCode, reports, conceptual design of collimation CLIC Drive Beam WP, BJ, LCWS115

Resources Need collaborations. Activities may be reshaped in order to build nice coherent blocks of activity. No budget for material : might be problematic if hardware studies or prototypes are needed – Clear case : SR absorption Resources: Total Material (kCHF): Personnel (FTE) * :3.4 (0.6)4.6 (0.6) 26.4 (3.6) Present collaborations : (CTF3 kept apart) Ankara / Avni Aksoy Frascati / Caterina Biscari, Andrea Ghigo, David Alesini : How many FTE’s ? * : needed (existing) CLIC Drive Beam WP, BJ, LCWS116

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