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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 on theme: "NNP Non Neutral Plasma Physics Group Intense Beam Transport and Space Charge Compensation Strategies Oliver Meusel August 2015 16 th International Conference."— Presentation transcript:

1 NNP Non Neutral Plasma Physics Group Intense Beam Transport and Space Charge Compensation Strategies Oliver Meusel August 2015 16 th International Conference on Ion Sources - ICIS 2015 -

2 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 !

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

4 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

5 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

6 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

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

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

9 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 measured @ cea - Saclay 95 keV / p / 98 mA

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

11 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) measured @ GSI - Darmstadt

12 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

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

14 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

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

16 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

17 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

18 NNP Non Neutral Plasma Physics Group Diagnostics for Compensation Electrons

19 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

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

21 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 -

22 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

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