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cpots2013.physics.uoc.gr Dept. of Physics, University of Crete Aug 15 – 30, 2013

U C M. CPO TS – 3 rd ERASMUS Intensive Program Introduction to C harged P article O ptics: T heory and S imulation. http://cpots2013.physics.uoc.gr Dept. of Physics, University of Crete Aug 15 – 30, 2013 Heraklion , Crete, GREECE. VAN DE GRAAF ACCELERATOR.

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cpots2013.physics.uoc.gr Dept. of Physics, University of Crete Aug 15 – 30, 2013

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  1. UCM CPOTS – 3rd ERASMUS Intensive ProgramIntroduction to Charged Particle Optics: Theory and Simulation http://cpots2013.physics.uoc.gr Dept. of Physics, University of Crete Aug 15 – 30, 2013 Heraklion, Crete, GREECE http://cpots2013.physics.uoc.gr

  2. VAN DE GRAAF ACCELERATOR Robert J. Van de Graaff (1901-1967) http://cpots2013.physics.uoc.gr

  3. Contents • Stages of operation • Basic components • The simulation • Lua programming • Problems - Suggestions http://cpots2013.physics.uoc.gr

  4. Stages of operation • Sputter ion source ,preacceleration (90 keV) • Einzel lens (0-50kV) • Tandem accelerator • Foil stripper • Second stage of acceleration • Quadrupoles • Selection magnet • Quadrupoles, switching magnet http://cpots2013.physics.uoc.gr

  5. Components Source: 60 KeVs,circular distribution ,radius 1 mm, cone direction, half angle of 10 Einzellens: -34.1kVs http://cpots2013.physics.uoc.gr

  6. Stages of operation Tandem accelerator: high accelerating voltages Carbon foil, many charge states http://cpots2013.physics.uoc.gr

  7. Stages of operation Quadrupoles :~450 Mags, many different energies, unable to focus completely the beam http://cpots2013.physics.uoc.gr

  8. Stages of operation Selection Magnet: separation of energies -charges http://cpots2013.physics.uoc.gr

  9. Full Setup http://cpots2013.physics.uoc.gr

  10. Lua background codeStripping Procedure local test1 = TP(x_at_stripping_position_mm,0,0,1,0,0, -- surface function() -- function called when a particle hits the test plane new_charge= math.floor(ST.gaussian_rand() * 2 + ion_q_state_at_stripping+ 0.5) end ion_charge = new_charge ion_color = new_charge mark() local speed, az, el = rect3d_to_polar3d(ion_vx_mm,ion_vy_mm,ion_vz_mm) localke = speed_to_ke(speed,ion_mass) end ) http://cpots2013.physics.uoc.gr

  11. Lua background codeA further step Capability of beam selection functionsegment.init_p_values() local terminal_voltage_volts = (req_energy_MeV*1000000- 60000)/(1+req_charge) if (ion_instance == 7) thenadj_elect05 = terminal_voltage_voltsend local velocity = math.sqrt(2*req_energy_MeV*1000000/req_mass) local magsel=(req_mass*velocity*1.018029323)/(req_charge*0.4) if (ion_instance == 4) thenadj_pole11 = magselend http://cpots2013.physics.uoc.gr

  12. Lua background codeA further step local velocity = math.sqrt(2*req_energy_MeV*1000000/req_mass) local magsel=(req_mass*velocity*1.018029323)/(req_charge*0.4) if (ion_instance == 4) then adj_pole11 = magsel end http://cpots2013.physics.uoc.gr

  13. Lua background codeA further step • Final Adjustment – The Quadrapoles focusing • Selective usage • Recursive Code • Monte Carlo type approach • ΔV=V*sqrt(particles) http://cpots2013.physics.uoc.gr

  14. Problems - Suggestions • Inexplicable errors in KE • Heavy Data Load – Large files • Further adding of parts • Quicker Algorithms http://cpots2013.physics.uoc.gr

  15. Thank you for listening!Any questions? http://cpots2013.physics.uoc.gr

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