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Linear Collider Machine Protection Issues M. Palmer

Linear Collider Machine Protection Issues M. Palmer. Injection System Injector Damping Rings Bunch Compressor and Transfer Sections Main LINAC Beam Delivery System Questions. Injection System. Main NLC LINAC. MAID System Monitor orbit tolerance Generate permit for DR extraction

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Linear Collider Machine Protection Issues M. Palmer

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  1. Linear Collider Machine Protection IssuesM. Palmer • Injection System • Injector • Damping Rings • Bunch Compressor and Transfer Sections • Main LINAC • Beam Delivery System • Questions

  2. Injection System

  3. Main NLC LINAC • MAID System • Monitor orbit tolerance • Generate permit for DR extraction • Hardware verification required for DR extraction • Klystron/Modulator, Magnets, Movers, Timing, Control System • 100ms polling timescale • Specific concern: Possible back-phasing of RF sector. Implications? • Pre-LINAC beam dumps? • Keep as much of machine active as possible during fault • Pilot Pulse • Require low intensity pulse to avoid damage • Ii10x, ehh10x, evh1000x • Operative when break in operation of < 1 sec. Detailed ramp to full intensity

  4. Main TESLA LINAC • TTF methods • Monitor current losses • Inhibit gun (3-5 ms) • Similar methods may be applied in final design • Orbit tolerance monitoring easily added • Easily applicable at LINAC start • Beam remains in DR on LINAC inhibit • Beam expected to continue thru LINAC on magnet or module failure • Fast Emergency Extraction Line (FEXL) at end of LINAC • Diverts beam from BDS in 1-2 bunches • Inhibits DR extraction within ~200 bunches of problem • Serves as bypass during commissioning

  5. LINAC Bunches & Current Densities

  6. Beam Delivery System

  7. Questions • Injector System/Damping Rings • Stability issues for downstream fault • Beam dump between DR and LINAC • Permanent Magnet Wiggler/Undulator protection issues • LINAC • Early LINAC protection scenarios • RF phasing • System Issues • Startup and recovery plans • Alignment • Optics validation • Protection system failure analysis • Collimation Issues • Spoilers • Near miss damage • Replacement/maintenance issues • Material damage limits • Absorber • Energy distribution • Beam Halo Implications for Detectors

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