Common Beam Dynamics Issues - PERLE/JLEIC Cooler

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Presentation transcript:

Common Beam Dynamics Issues - PERLE/JLEIC Cooler per discussion with David Douglas Alex Bogacz JLAB, Aug. 14, 2017

CSR and Micro-bunching Suppression of CSR-induced emittance growth (via lattice) Isochronous lattice with minimized variation of M56 Benchmarking of CSR codes against machine data CSR model validation - especially longitudinal space–charge effects at the ends of the bunches (contributing to the halo) - still difficult to model (e.g. ASTA) Micro-bunching dynamics - especially gain model validation and gain control Study of CSR shielding Critical for JLEIC Cooler Alex Bogacz JLAB, Aug. 14, 2017

Longitudinal Match Control of RF phasing for high power beams “How do I turn on a 10 MW beam without the whole platform going unstable?" Energy spread control e.g. making a monochromatic beam using the longitudinal match to flatten the energy spread (recently discussed technique) Timing control with M56 Longitudinal phase-space distortion due to wakes, including CSR and longitudinal s-c How to manage these distortions - suppressing phase space correlations/distortions – new mitigation schemes Developing appropriate instrumentation to diagnose them Alex Bogacz JLAB, Aug. 14, 2017

Regenerative BBU High power (currents/bunch charge) threshold measurement and validation HOM Q-broadening and beam loading effects self-stabilization mechanisms for high power beams Threshold scaling with number of recirculating passes Benchmarking existing codes against machine data Alex Bogacz JLAB, Aug. 14, 2017

Halo Formation and Control Intra-beam scattering (IBS)/Touschek/beam-gas scattering and their impact on halo formation Ion trapping and accumulation Touschek/Beam – gas scattering Bremstrahlung contributes to the radiation load Dark current mitigation Halo collimation Optimized lattice for halo collimation in a non-equilibrium beam Collimation tests Alex Bogacz JLAB, Aug. 14, 2017

Space-charge Focusing Design of transport optics up to 100 MeV JLEIC Cooler relies on it Longitudinal space-charge effects longitudinal phase-space distortion Alex Bogacz JLAB, Aug. 14, 2017

High Current Injector Challenges as suggested by Andrew Hutton Injector design and validation Merger design and validation Usage of Penner bends to alleviate space-charge focusing Alex Bogacz JLAB, Aug. 14, 2017