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A few items for the round -table

A few items for the round -table. B. Jeanneret CERN/ABP WG6 at IWLC_2010. The way to produce these beams. Why make it so complicated ?. 292 -----. Beam production. Gun must produce n = 2922×24×50 = 3.5×10 6 bunches /s ( current I = 4A )

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A few items for the round -table

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  1. A few items for the round-table B. Jeanneret CERN/ABP WG6 at IWLC_2010

  2. The way to producethesebeams • Whymakeitsocomplicated ? 292 -----

  3. Beam production • Gun must producen = 2922×24×50 = 3.5×106bunches/s (current I = 4A) • Must alternate trains withodd/evenbunches • Odd/evenbunch structure must be programmable inside the rise-timeperiod (Olexsiy) • Timing tolerance for the beamat the entrance of the DB Linac: • Δφ1 = 0.1°@1GHz ⇔ 85 μm ⇔ 0.3 ps • Timing at 12 GHZ (synchonisation DB/MB & MB e+/e-) : • Δφ2 = 0.2°@12GHz ⇔ 14 μm ⇔ 0.46 fs (46 × 10-15 s) • As for the DB Linacitself , in the segment before compression: • Gradient : ΔG/G < 2×10-3coherent over 100 klystrons, < 2×10-2 per klystron • Phase : Δφ = 0.05° to avoidunduebunchlenghtening (A. Aksoy, D. Schulte) CTF3 with pulse compression: Δφ∼ 10-50° along train What do weprove for CLIC Δφ? Can a thermo-ionic gun, followed by a bunching System, do this ? Will a reliable laser gun exist ? Whatcan CTF3 tell us about this ? Will itgive us a proof of principle ?

  4. Options for Dipoles & Vacuum vs. SR • Super-conductingsuper-ferricmagnets • s.ccoils, but classicalC-yoke for fieldshaping • More expensive, but power ÷5 • Costsavingswith time • Cold pipe (∼20-30K)  Thermal expansion vanishes • Another vacuum regime to study • Classicalresistivemagnets • Berylium pipe atSR-impact • Transparent to 6 KeVX-rays • SR absorbed in water behind • Be disliked for safetyreasons ⇔negotiable ? Ageingsolved

  5. Operability RF deflector Kicker RF kicker (phase synchro) • Total longestpath for a train : 29 km • Through : • 820 klystrons • 14 RF deflectors • 3 Kickers • 5 compression chicanes • 1 RF kicker • 2 loops • 2 rings, severalturns 24 times • The 24 trains • must Survive with: • Beamlosses < 10-3 • Bunchlenghtening < few % • δz ∼ 10 μm Klystrons : 80 740 DB linac ∼20 km

  6. Future (post-CDR) • Manyoustanding issues to beworked-out • Can CTF3 validate the requirements for the CLIC Drive Beam ? • If not, what do weneed to do so Myworries : Mismatchbetweenwork to do & manpower • Activityscattered in toomany ‘sub-projects’ Will wereducethis in 2011 ?

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