WG 2 Beam Dynamics Optics and Instrumentation Summary
WG 2: Beam Dynamics, Optics and Instrumentation – Summary Daniel Schulte and Alex Bogacz Thomas Jefferson National Accelerator Facility 1
ERL Projects Interesting projects being discussed ERL at KEK ALICE PERLE LHe. C e. RHIC CBETA ERL for MESA b. ERLin. Pro Nice mixture of future, existing and past facilities Thomas Jefferson National Accelerator Facility Operated by JSA for the U. S. Department of Energy 2
Example of the lessons learned P. Williams Thomas Jefferson National Accelerator Facility Operated by JSA for the U. S. Department of Energy 3
What limits number of ERL passes? ERL with FFAG arcs – Can switchyard be configured with FFAG as well? G. Hoffstaetter C. Mayes S. Berg Thomas Jefferson National Accelerator Facility 4
Beam Dynamics Issues for Multi-pass ERLS Large range of beam dynamics issues Thomas Jefferson National Accelerator Facility Operated by JSA for the U. S. Department of Energy 5
What limits number of ERL passes? Optimization of multi-pass linac Optics for ER operation Acceleration/Deceleration ‘Drift Linac’ Einj E 1 E E 3 E 4 E 5 E 6 E 7 E 9 E 10 8 2 600 E FODO F. Meot Einj E 1 E E 3 E 4 E 5 E 6 E 7 2 E E 9 E 10 8 Thomas Jefferson National Accelerator Facility ER@CEBAF 5 -pass, 7 Ge. V 6
What limits number of ERL passes? Optimization of multi-pass linac Optics for ER operation Maximum electron energy: 18 Ge. V Ie=50 m. A polarized electron source employing merging electron current produced by multiple electron guns Main ERL SRF linac(s): 647 MHz cavities, 3 Ge. V/turn Six individual re-circulation beamlines based on electromagnets For very high luminosity (~1034 cm-2 s-1) with hadron cooling system (Ce. C) V. Ptitsyn Thomas Jefferson National Accelerator Facility 7
e. RHIC Not the main focus of the work Ring-ring option is in the focus But still efforts on ERL Important challenges Beam break-up Addressed by cavity design with strong damping Beam losses An important concern for many projects Technical means: Apertures, collimation, diagnostics But also understanding of sources and choice of beam current CBETA will provide important input, an example of the synergy in the field Thomas Jefferson National Accelerator Facility Operated by JSA for the U. S. Department of Energy 8
Limits on longituinal acceptance in high energy ERLs LHe. C 60 Ge. V ERL – Beam Dynamics Issues D. Pellegrini Thomas Jefferson National Accelerator Facility 9
Limits on longituinal acceptance in high energy ERLs LHe. C 60 Ge. V ERL D. Pellegrini Thomas Jefferson National Accelerator Facility 10
Limits on virtual power vs RF power in high energy ERLs 100 m. Amp 50 Me. V A. Jankowiak M. Abo-Bakr 15 m. Amp 400 Me. V W. Kaabi A. Bogacz Thomas Jefferson National Accelerator Facility 11
PERLE R&D Program - TDR Liner lattice optimization Initial magnet specs Momentum acceptance and longitudinal match End-to-End simulation with synchrotron radiation, CSR micro-bunching (ELEGANT) Correction of nonlinear aberrations (geometric & chromatic) with multipole magnets (sext. octu. ? ) RF cavity design, HOM content BBU studies (TDBBU) Injection line/chicane design Space-charge studies at injection Diagnostics & Instrumentation Multi-particle tracking studies of halo formation Final magnet specs Engineering design Thomas Jefferson National Accelerator Facility Operated by JSA for the U. S. Department of Energy 12
MESA Project, Research Facility 5 Me. V dump ERL loop 155 Me. V dump MAMBO EL BA P 2 M MAGIX Recirculation arcs 2 -4 Gun Ext. beamline Recirculation arcs 1 -3 -5 MEEK-2 MEEK-1 Picture: D. Simon F. Hug • Normalconducting injector and superconducting main linacs • Double sided recirculation design with vertically stacked return loops • Two modes of operation: - EB-operation (P 2/BDX experiment): polarized beam, up to 150 µA @ 155 Me. V Thomas Jefferson National Accelerator Facility - ERL-operation (MAGIX experiment): (un)polarized beam, up to 1 (10) m. A @ 105 Me. V Operated by JSA for the U. S. Department of Energy 13
Mitigation scheme for CSR/microbunching Thomas Jefferson National Accelerator Facility C. Tennant 14
Outlook Number of existing and future ERL’s Various beam dynamics issues being addressed by several ERLs Maximizing number of passes Maximizing virtual beam power Mitigation of limiting factors: BBU, CSR/microbunching Diagnostics & Instrumentation for multiple beams (10? ) Multi-particle tracking studies of halo formation Importance of lessons learned from past ERLs Thomas Jefferson National Accelerator Facility Operated by JSA for the U. S. Department of Energy 15
- Slides: 15