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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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