NNP Non Neutral Plasma Physics Group Intense Beam Transport and Space Charge Compensation Strategies Oliver Meusel August 2015 16 th International Conference.

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Presentation transcript:

NNP Non Neutral Plasma Physics Group Intense Beam Transport and Space Charge Compensation Strategies Oliver Meusel August th International Conference on Ion Sources - ICIS

NNP Non Neutral Plasma Physics Group Outline Requirements on Accelerator physics - Luminosity Current density at „Final Focus“ Beam current I s minimum spot size  pxpx x Beam emittance Beam emittance vs. Beam current Space Charge !

NNP Non Neutral Plasma Physics Group Emittance Growth due to Thermalisation  rms,x = 8 ! Gaussian start distribution

NNP Non Neutral Plasma Physics Group Space Charge Compensation p / W b = 120keV / I b = 50mA / T e = 30eV Boltzmann distribution of CE‘s Global and Local degree of compensation

NNP Non Neutral Plasma Physics Group SCC Along the Beam Path © D. Noll PIC – Simulation using BENDER © cea saclay, R. Gobin et. al. 8 mm 95 keV / p / 100 mA 120 keV / p / 100 mA / KV distribution 14 keV / He + / 11 mA

NNP Non Neutral Plasma Physics Group Beam Optics time comparison of focusing strengthes MSQ strong focusing/defocusing SCL strong focusing Solenoid weak focusing Chromatic, Geometric and Spherical Aberrations

NNP Non Neutral Plasma Physics Group SCC and Beam Optics Space-Charge Compensation in Intense Ion Beams Under the Influence of Beam Optics

NNP Non Neutral Plasma Physics Group SCC in a LEBT Section 95 keV / p / 98 mA cea - Saclay © D. Noll PIC – Simulation using BENDER 120 keV / p / 100 mA / KV distribution

NNP Non Neutral Plasma Physics Group Aberration Caused by SCC increasing of the electron - RGA scattering frequency increasing of the electron production rate suppressing of the satellites Satellites Healing by the use of Buffer Gas ? Energy spread Recombination of HCI / losses Increased gas flow into high power RFQ cea - Saclay 95 keV / p / 98 mA

NNP Non Neutral Plasma Physics Group Gabor - Lens Space Charge Lens Ar + / 88 keV (2.2 keV/u) GSI - Darmstadt

NNP Non Neutral Plasma Physics Group Compensation Electron Reservoir - Space Charge Lens lens parameters   A = 9.5 kV B z = 10.8 mT Ar + / 88 keV (2.2 keV/u) GSI - Darmstadt

NNP Non Neutral Plasma Physics Group Tasks for the Improvement of SCC under UHV- Conditions Measurement of the Beam Potential Non-interceptive Beam Diagnostics Diagnostics for Compensation Electrons Sources for Compensation Electrons Interaction of Ion Beams with Electrons

NNP Non Neutral Plasma Physics Group Electron Beam Probe independent of residual gas pressure

NNP Non Neutral Plasma Physics Group EBP Measurement – Beam Pofile without ion beam with ion beam D. Hoffmann TU Darmstadt He + / 14 keV / 2 mA

NNP Non Neutral Plasma Physics Group Why Non-Interceptive Beam Diagnostics Ch. Wagner MA Frankfurt University Emittance scanner P. Groß PhD Frankfurt University

NNP Non Neutral Plasma Physics Group Beam Tomography Reconstruction of Ion Density Distribution using MENT Simulated CE Distribution using the Superposition of the Beam Potential and Magnetic Field of the Solenoid He + / 14 keV / 2 mA

NNP Non Neutral Plasma Physics Group Self-Consistent Calculation of Compensation tomography n i (x,y) free parameter n e (x,y) & T e electron beam probe  BA &  BE production & distribution of RGI distribution of CE (Boltzmann Equ.) n i (x,y) + n RGI (x,y) + n e (x,y) Poisson Equ. comparison with  BA &  BE

NNP Non Neutral Plasma Physics Group Diagnostics for Compensation Electrons

NNP Non Neutral Plasma Physics Group Sources for Compensation Electrons Cold emitter as an CE-source Courtesy of F. Odorici, INFN - Bologna CNT In collaboration with INFN Catania S. Gammino

NNP Non Neutral Plasma Physics Group Interaction of Ion Beams with Electrons S. Geyer / O. Kester

NNP Non Neutral Plasma Physics Group Outlook Reduction of SCC induced aberrations SCC under UHV conditions interaction of CE‘s with HCI beams p – clouds for transport of negative ion beams ? Requirements on Accelerator physics - Luminosity -

NNP Non Neutral Plasma Physics Group Thank you for your attention! In the name of the Frankfurt NNP group: nnp confinement and diagnostics - K. Schulte / K. Zerbe / D. Beberweil / V.Britten development of diagnostics - Ch. Wagner / K. Zerbe / A. Ates num. models - D. Noll / M. Droba / B. Scheible beam preparation and ion optics - Ch. Wiesner / O. Payir / Fips Schneider / D. Born beam storage and compensation - M. Droba / H. Niebuhr beam interactions - S. Geyer / O. Kester