top level overview of target injection and tracking tasks
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Top level overview of target injection and tracking tasks. Presented by Dan Goodin at the. High Average Power Laser Program Workshop Princeton Plasma Physics Laboratory October 27 and 28, 2004. Summary - target injection, tracking, and beam steering. What is target injection and tracking? - PowerPoint PPT PresentationTRANSCRIPT
Top level overview of target injection and tracking tasks
High Average Power Laser Program Workshop
Princeton Plasma Physics Laboratory
October 27 and 28, 2004
Presented by
Dan Goodin
at the
1. What is target injection and tracking?
2. What are the basic requirements?
3. What are the issues to be addressed?
4. What’s being done?
Summary - target injection, tracking, and beam steering
1. Build an injector that accelerates targets to a velocity to traverse the chamber (~6.5 m) in 16 milliseconds or less.
2. Demonstrate target tracking with sufficient accuracy for a power plant (+/- 20 microns).
Phase I injection/tracking/steering tasks
Phase I goals for target injection and tracking:
TurboPumps
Gun Barrel
TargetCatcher
Target Position
Detectors
Sabot Deflector
RevolverChamber
ExpansionTanks
73
R 7 mT ~1500 C
Injection, tracking, & steering requirements are “challenging”
• Inject about 500,000 targets per day (~6 Hz) for 1000 MW(e)• High velocity - ~400 m/s, separable sabot for handling/accelerating• Acceleration limited to about 1000 g’s (for “real” cryo target, TBC)• Need membrane support to avoid point-loading of target• Reliable, repetitive placement to 5 mm• Direct drive tracking and beam steering to 20 m• Integration of tracking & beam steering (reference system)
1) Showing a method to repetitively inject targets at high velocity- Gas gun demo- “Advanced” injection methods
(EM injector)
2) Showing in-flight tracking to 20 m- Ex-chamber tracking demo- Develop in-chamber tracking
methods
What are the issues and what’s being done?
We have demonstrated with the gas-gun:-Rep-rated operation (6 Hz, “burst” mode)-Two-piece sabot separation and deflection-Membrane support of target in sabot -Injection velocity of ≥400 m/s-Time “jitter” at chamber center of ~ 0.5 ms-In-flight tracking-Target placement accuracy at one sigma of 10 mm
Sabot separation at 400 m/s
Approximately 25 meter length reflects SOMBRERO plant fueling layout
Evaluating/testing electromagnetic, non-contacting coil gun design for the future
3) Showing how to integrate the tracking and beam steering systems- Conceptual designs and analyses
4) Showing target survival during the injection process- Modeling of DT heatup during injection- Modeling of DT response to heatup- Experiments with rapid DT heatup- Measurements of DT strength
What are the issues and what’s being done (continued)?
488nm guide laser
Poisson spotdetector
Target chamber
Reference “Sphere”Space frame15m
Reference sphere to define target chamber center
Simulation of 18K target entering 4000K chamber gas
Tmax = 4.36 103 KTave = 1.42 103 KVmax = 261.7 m/s
Axisymmetric
Chamber conditions affect heatup and tracking
DT cell for rapid heatup
testing
Design of cell for measuring
strength of DT (2mm X 2mm
view)
The presentations deal directly with these issues………
Talks in this session:
1) Target survival during injection - René Raffray
2) Target injection issue, background gas and plasma - David Harding
3) In-chamber tracking and integration with beam steering - Graham Flint
4) Status of target injection experiments - Dan Frey
5) Status of target tracking experiments - Ron Petzoldt
Injection experiment setup to simulate full-length of Sombrero fueling
In-flight tracking at 400 m/s