Beam steering capability for target position uncertainty
Simon Yu & Enrique HenestrozaLawrence Berkeley National Laboratory
ARIES MeetingOctober 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 (µs 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
Profile at magnet exitCurrent at magnet exit
voltage5cmcurrent
Test Stand for Measurement of Transient Magnetic Field
Three-way B probes•
(Bx, By and Bz )
0
1
2
3
4
5
6
7
0.5 1 1.5 2 2.5 3 3.5
Time (ms)
Cu
rren
t (kA
)
0
0.5
1
1.5
2
2.5
3
B (
kG
)
Current (kA) #1 Br (kG) #2 -Br (kG) #3 Br (kG) #4 -Br (kG)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)
#1 Br (kG)
0
0.5
1
1.5
2
2.5
3
0.5 1 1.5 2 2.5 3 3.5
Time (ms)
Br
(kG
)
•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
Spot size with plasma
Magnetic section
Spot size without plasma
Pulsed arc plasma source
Drift tube Scintillating glass