05.03.2007 Design of a Low-Energy System for FRANZ Christoph Wiesner
Contents Introduction Design and Layout of the Multi-Particle Simulation LEBT Outlook
Function of the Input: 150 ma cw proton beam, 120 kev Output: 50-100 ns bunches, repetition rate f = 250 khz LEBT- 150 kv Terminal W b = 120 kev 4 P = 2.4 x 10 W b W b = 1 MeV 4 P b,max = 1 x 10 W Steerer W b = 1.87-2.1 MeV 4 P b,max = 2.1 x 10 W Rebuncher Strahlstopper Detektor- und Komponententeststand Dipolmagnet Ionenquelle t = 50-100ns f = 250kHz RFQ Rebuncher CH f = 5-10MHz Bunchkompressor 7 Li Target
Possible s Types Disc Electrical Magnetic with Helmholtz Coils Dipole System
Functional Principle of the Dipole System Beam Diagnostics Dipole Magnet f = 250 khz τ= 50-100 ns Resonant Circuit High Current Proton Storage Ring
Functional Principle of the Dipole System Aperture time 1,0 Varying the aperture leads to different bunch lengths and intensities. Transmission / % 0,8 0,6 0,4 0,2 0-100 -75-50 -25 0 25 50 75 100 t / ns
Layout Dipole System Beam Diagnostics Parameter Setting: Dipole Magnet B max = 0.3 T Dipole Length = 0.3 m f = 250 khz τ= 50-100 ns Total System Length = 0.6 m Resonant Circuit 0.3m High Current Proton Storage Ring Gap Height = 0.06 m 0.6m B( t) = Bmax sin( ωt + Φn)
Layout LEBT Beam Diagnostics Dipole Magnet f = 250 khz τ= 50-100 ns Resonant Circuit High Current Proton Storage Ring LEBT Solenoid 1: Aperture 150mm 150 kv Terminal W b = 120 kev 4 P = 2.4 x 10 W b W b = 1 MeV 4 P b,max = 1 x 10 W Steerer W b = 1.87-2.1 MeV 4 P b,max = 2.1 x 10 W Rebuncher Solenoid 2-4: Aperture 100mm Strahlstopper Detektor- und Komponententeststand Dipolmagnet Ionenquelle t = 50-100ns f = 250kHz RFQ Rebuncher CH f = 5-10MHz Bunchkompressor 7 Li Target
Schematic View of LEBT
Schematic View of LEBT Beam Envelope
Schematic View of LEBT Simulation Programs used: Lintrafive (Sek1, Sek3) DipMag (Dipole)
Input Distribution 60 Solenoid 1 Solenoid 2 Solenoid 3 Solenoid 4 50 Strahlradius r [mm] 40 30 20 Start Parameters Ion Source Beam Radius: 6 mm Divergence Angle: 80 mrad Homogeneous Distribution (Assumed) 10 0 0 500 1000 1500 2000 2500 3000 3500 Dipol ausgeschaltet Dipol eingeschaltet
Phase Distribution in front of Dipole 60 Solenoid 1 Solenoid 2 Solenoid 3 Solenoid 4 50 Strahlradius r [mm] 40 30 20 10 0 0 500 1000 1500 2000 2500 3000 3500 Dipol ausgeschaltet Dipol eingeschaltet
Simulation Dipole System 60 Solenoid 1 Solenoid 2 Solenoid 3 Solenoid 4 50 Strahlradius r [mm] 40 30 20 10 0 0 500 1000 1500 2000 2500 3000 3500 Dipol ausgeschaltet Dipol eingeschaltet
Phase Distribution behind Slit B max (Dipole)= 0.2 T 60 Solenoid 1 Solenoid 2 Solenoid 3 Solenoid 4 50 Strahlradius r [mm] 40 30 20 10 0 0 500 1000 1500 2000 2500 3000 3500 Dipol ausgeschaltet Dipol eingeschaltet
60 Solenoid 1 Solenoid 2 Solenoid 3 Solenoid 4 50 Strahlradius r [mm] 40 30 20 10 0 0 500 1000 1500 2000 2500 3000 3500 Dipol ausgeschaltet Dipol eingeschaltet
creates different beam distribution (depending on direction of Magnetic Field). Spatial Distribution in front of RFQ 60 Solenoid 1 Solenoid 2 Solenoid 3 Solenoid 4 50 Strahlradius r [mm] 40 30 20 10 0 0 500 1000 1500 2000 2500 3000 3500 Dipol ausgeschaltet Dipol eingeschaltet
Phase Distribution in front of RFQ
Phase Distribution in front of RFQ - 3d 1,0 Transmission / % 0,8 0,6 0,4 0,2 0-100 -75-50 -25 0 25 50 75 100 t / ns
Outlook: To Do? Multi-Particle Simulations Beam Dynamics in LEBT Variation of Parameters Beam Dynamics in Variation of Parameters Emittance Growth Estimations Simulations for H 2+ and H 3 + Layout Fix Geometry of Begin Construction Vacuum Chamber Technical Implementation Choose Type of Dipole Choose Magnetic Material Design Electronic Control