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HINS ProtonSource/LEBT Beam Measurement

HINS ProtonSource/LEBT Beam Measurement. Meeting on HINS Beam Dynamics and Diagnostics March 13, 2009. Salah Chaurize Vic Scarpine Wai-Ming Tam. Content. Layout of HINS proton source/LEBT Beam profile measurement using wire scanner Steering capability of the trim dipole magnets

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HINS ProtonSource/LEBT Beam Measurement

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  1. HINS ProtonSource/LEBT Beam Measurement Meeting on HINS Beam Dynamics and Diagnostics March 13, 2009 Salah Chaurize Vic Scarpine Wai-Ming Tam

  2. Content • Layout of HINS proton source/LEBT • Beam profile measurement using wire scanner • Steering capability of the trim dipole magnets • Beam rotation by focusing solenoid

  3. Pictures of LEBT and Wire Scanner Proton Source Wire Scanner Solenoid

  4. Layout of LEBT UH, UV DH, DV US DS Wire Scanner Proton 17 cm 17 cm 52 cm 22.4 cm Beam Energy = 48 keV Beam Current = 8 mA

  5. A Typical Wire Scan A Typical Fit Expression used for fitting: where Proton Other species Other species fill out the whole beam pipe. For a typical fit, standard deviation for s1 is about 2%. Beam Pipe

  6. Horizontal Beam Width The strength of the upstream solenoid has little effect on beam size. The size of the beam waist is measured to be ~0.7 mm.

  7. Vertical Beam Width The strength of the upstream solenoid has little effect on beam size. The size of the beam waist is measured to be ~0.6 mm.

  8. Asymmetric Beam The beam is asymmetric. Beam asymmetry can be due to misalignment in beamline and/or possibly from the proton source itself.

  9. Comparison to TRACK Simulation US = 380 Amps Wire Scanner Current = 8 mA Energy = 50 keV Input Beam for TRACK: ε(n,rms) = 0.233 πmm-mrad α = -1.82 β = 0.331 mm/mrad

  10. Trim Dipole Steering 55o 18 mm 18 mm Trim dipoles at 100 Gauss. Steering effect is rotated by the downstream solenoid. West All possible combinations of trim setting fall inside the diamond. Up East Down

  11. Beam Rotation by Solenoid Leff Paper by K.T. McDonald Center of Solenoid Azimuthal Kick Azimuthal Kick Helical Path Solenoid Azimuthal Kick Uniform Field Angle of rotation thru solenoid

  12. Beam Rotation by Solenoid Exact location of beam needed to be analyzed. Rotation of beam as a function of solenoid field matches well with calculations. DS = 450 to 570 Amps

  13. Conclusion • Beam waist at wire scanner srms ~ 0.7 mm • Beam is asymmetric. It can possibly be due to misalignment. • Trim dipoles steer beam +/- 9 mm both planes. • Beam rotation due to solenoid agrees with model. Model can possibly be used to determine solenoid misalignment.

  14. Distance Between WS and RFQ There is a known distance between the wire scanner and the vanes of the RFQ. Vanes of RFQ Wire Scanner Downstream Solenoid 5.9 cm 8.1 cm 14 cm

  15. Uni-Polar Steering Dipole US = 440 amp DS = 510 amp UH (West) UV (Up) DV (Down) DH (East)

  16. Uni-Polar Steering Dipole Downstream trims give more steering. DH UV UH DV Symmetric UV DH DV UH

  17. Vertical Beam Width DS = 450 to 570 Amps US = 410 to 490 Amps

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