Beam steering capability for target position uncertainty Simon Yu & Enrique Henestroza Lawrence...
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Transcript of Beam steering capability for target position uncertainty Simon Yu & Enrique Henestroza Lawrence...
Beam steering capability for target position uncertainty
Simon Yu & Enrique HenestrozaLawrence 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)
First Beam through NTX Magnetic Transport (August 2002)
NTX with source tank, 4 pulsed quadrupoles, and diagnostic tankIn Bldg. 58, LBNL
voltage
current 5cm
Current at magnet exitProfile at magnet exit
Test Stand for Measurement of Transient Magnetic Field
Three-way B probes•
(Bx, By and Bz )Probe #1 R
-1
-0.5
0
0.5
1
1.5
0.5 1 1.5 2 2.5 3 3.5
Time (ms)
Sco
pe
(V)
•B(t)
B(t)
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