Advanced and Future Advanced and Future Accelerator Techniques Accelerator Techniques Is There Life Is There Life in in HEP? HEP? E. Colby E. Colby Stanford Linear Accelerator Center Stanford Linear Accelerator Center Accelerator Research Department B Accelerator Research Department B SLUO Annual Meeting SLUO Annual Meeting July 7, 2000 July 7, 2000
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Advanced and Future Accelerator Techniques Is There Life in HEP?
Advanced and Future Accelerator Techniques Is There Life in HEP?. E. Colby Stanford Linear Accelerator Center Accelerator Research Department B SLUO Annual Meeting July 7, 2000. Key Accelerator Technologies. Electron Colliders: NLC, N 2 LC,... Polarized particle sources - PowerPoint PPT Presentation
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Advanced and Future Advanced and Future Accelerator TechniquesAccelerator Techniques
Is There Life Is There Life inin HEP? HEP?
E. ColbyE. Colby
Stanford Linear Accelerator CenterStanford Linear Accelerator CenterAccelerator Research Department BAccelerator Research Department B
Muon Colliders: FMC,…Muon Colliders: FMC,…– Very high intensity synchrotron (5e13 ppp)Very high intensity synchrotron (5e13 ppp)– High power conversion targets (5-7 MW)High power conversion targets (5-7 MW)– Efficient capture optics (20-31 T Solenoid)Efficient capture optics (20-31 T Solenoid)– Rapid emittance damping systems (Rapid emittance damping systems (<1 <1 s)s)– Large aperture acceleratorLarge aperture accelerator– Collider ring design (decay neutrinoCollider ring design (decay neutrino– Final focus opticsFinal focus optics
Other Required Other Required TechnologiesTechnologies
General transport opticsGeneral transport optics Beam diagnosisBeam diagnosis Feedback systemsFeedback systems Control systemsControl systems Active and passive alignment systemsActive and passive alignment systems Vacuum systemsVacuum systems . . .. . .
Couple power efficiently from an Couple power efficiently from an external source to the beamexternal source to the beam– Power SourcePower Source– Power transmission systemPower transmission system– Coupling structureCoupling structure
“Starting from the 1930s, the energy has increased-- by about a factor of 10 every six to eight years… this spectacular achievement has resulted from a succession of technologies rather than from construction of bigger and better machines of a given type.” W. K. H. Panofsky, 1997.
Accelerator Progress of the Last 35 Years
Acceleration MethodsAcceleration Methods
Traditional slow-wave accelerationTraditional slow-wave acceleration– Normal-conducting Normal-conducting – Super-conducting Super-conducting
Advantages:Advantages:– Structure is already broken down!Structure is already broken down!– Very high gradients possible E [GeV/cm] ~ Very high gradients possible E [GeV/cm] ~ n [cmn [cm-3-3]]– Plasma densities of 10Plasma densities of 101818-10-101919 [cm [cm-3-3] have been achieved ] have been achieved
Disadvantages:Disadvantages:– Short wavelength Short wavelength short Rayleigh range short Rayleigh range short short
interaction length (Laser guiding)interaction length (Laser guiding)– Accelerated particle bunch dimensions must be small Accelerated particle bunch dimensions must be small
compared to plasma wavelength to preserve beam compared to plasma wavelength to preserve beam qualityquality
– Shot-to-shot reproducibility of plasma density is criticalShot-to-shot reproducibility of plasma density is critical– Synchronization of successive plasma accelerators is Synchronization of successive plasma accelerators is
difficult (auto synchronization via single drive pulse)difficult (auto synchronization via single drive pulse)
Cerenkov radiation from trigger bunch stimulates emission from laser media, causing amplification of the Cerenkov wakefield. At an appropriate distance behind the trigger bunch, large acceleration fields are present.
L. Schächter, Technion, Israel
Is there a future for Is there a future for accelerator-based HEP?accelerator-based HEP?
Taken from the European Particle Accelerator Conference Proceedings, Stockholm, Sweden, 1998: