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Optimized Design: Beam Dumping System for FCC Layout

This case study focuses on the design of a beam dumping system for the FCC layout, storing 8.8 GJ in each beam. Requirements include fast and reliable operation with a 1.5 km extraction available. The system includes components such as a diluting kicker, septum, collimator, and more to meet the peak luminosity requirement. Key features include short rise/falling times, spare kicker modules for control feedback, and dilution kickers for beam painting. The system also considers the shower behavior for optimal energy deposition and includes segmented diluter kickers upstream of the dump block to reduce beam density. The study explores the possibility of liquid dumps and complex dump layouts.

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Optimized Design: Beam Dumping System for FCC Layout

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  1. Georges-Henry Oliver Luca 2017 CAS Erice case study:Design of a beam dumping system for FCC Nuria Lorena Vincenzo

  2. 100 km FCC Layout • 8.8 GJ stored in each beam. • Requirements for a dumping system: • Fast • Reliable • 1.5 km for extraction available. Injection team provided the injection kicker rise time (280 ns < 12e buckets) and filling pattern: 1 batch (with margin) = trise, inj+full buckets = 12empty+90bunches Possible no. of batches in max number of buckets (considering 80% filling factor) = 10667/(12+90)= 104 Total nr. of bunches = 104 x 90 = 9360 *Minimum 7095 from (head-on) peak luminosity requirement of 5 x 1034 cm-2s-1

  3. FCC horizontal dumping system Dump line Diluting kicker Septum Collimator Collimator Kicker 500mm 25mm thick 1.5 km

  4. FCC (horizontal) dumping system Kicker • Kicker deflection: 0.133 mrad • Kicker to Septum: 1050 m • Opening at the septum: 2.5 cm aperture + • 2.5 cm septum thickness + 10σ3.3TeV@septum+ margin = 8 cm • Septum deflection: 0.9 mrad • Septum to QF: 450m Septum

  5. Abort gaps and extraction kicker functions Total space for abort gap(s) = Total nr. of buckets (100% ring circumference)– nb,min = (13351-9360) = 3991 buckets = 3991 x 25 ns ~100 ms •  Up to 33 x 3 ms possible abort gaps • Fast rise/falling time of the kickers: 1μs to 3 μs • 1μs  possibility to add spare kicker modules for Field Uniformity Kicker Control corrective feedback (if erratic occurs) • Short rise time reduces the lost bunches • during asynchronous beam dump. •  Less stress for absorbers. • Flat top time from 8 μs (selective extraction of minimum 3 batches) up to 340 μs (revolution period for total abort). Field Uniformity Kicker Control

  6. FCC dump painting the beam • Dilution kickers paint the beam on the dump (spiraling out)  many for redundancy • Distance d between two bunches depend on the shower behavior! • d ~ 1.6mm distance spiral 3 cm [1] • Rmaxgives max diluter kick. • Complex dump layout • Different materials (liquid dump possibility) for optimal energy deposition. • Segmented diluter kickers 2.5 km upstream of the dump block. • Max deflection kick: 240 μrad • Large beta at dump block ~ 10km •  Reduction of the beam density. •  What about liquid dump? [1] F. Burkart, A. Lechner

  7. Thank you for your attention!

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