Beam steering capability for target position uncertainty Simon Yu & Enrique Henestroza Lawrence Berkeley National Laboratory ARIES Meeting October 3, 2002.

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Presentation transcript:

Beam steering capability for target position uncertainty Simon Yu & Enrique Henestroza Lawrence Berkeley National Laboratory ARIES Meeting October 3, 2002 PPPL

Steering in Heavy Ion Drivers 3 kinds of steering in drivers: 1.Slow (or DC)-dipoles - centroid correction (shot-to-shot reproducible errors) 2.Fast Correctors (  s to tens of ns) - head to tail variations (shot-to-shot reproducible errors) 3.Pulsed correctors (~ms) (shot-to-shot variable errors) Steering Capability for Target Position Uncertainty belongs to the 3rd class. Requirements: -Respond in 25ms (target injection at 200m/s) -Correction of a few mm (< ± 2mm)

Sample dipole corrector layout for final focus

First Beam through NTX Magnetic Transport (August 2002) NTX with source tank, 4 pulsed quadrupoles, and diagnostic tank In Bldg. 58, LBNL voltage current 5cm Current at magnet exit Profile at magnet exit

Test Stand for Measurement of Transient Magnetic Field Three-way B probes (B x, B y and B z ) B(t) B Overlay of B(t) in 4 quadrants and I(t) Axial profile (measurement vs. ANSYS)

First Beam through Neutralized Drift Section with Plasma Plug Magnetic section Pulsed arc plasma source Drift tube Scintillating glass Spot size with plasma Spot size without plasma

Dipole corrector Requirements are very easy to meet Required: Pulsed dipoles ~ 1kG in < 25msec Achieved: NTX quadrupoles ~ 7kG in 1 msec