fusion update general - arpa-e · michel laberge. arpae- 2017. 2. spherical shape. 3. magnetic...
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CONFIDENTIAL
General Fusion update
Michel Laberge
ARPAE- 2017
2
Spherical Shape
3
Magnetic Field During Compression
4
Shaft Current And Formation Current
5
X-Ray and Density
6
• PCS15 will compress earlier when the plasma is hotter• Better temperature diagnostic, x-ray, ion Doppler, neutrons• Unfortunately the current profile is hollow at these earlier time• Plasma might go unstable• Shoot in September, if it rains (forest fire hazard too high right
now!!)
Next shot
7
• Peter Turchi and others convinced us that we can’t exceed 100T at peak compression due to wall vaporization
• Start with larger flux conserver radius (20 cm to1.5 m), lower density (1e17 cm-3 to 3e14 cm-3), hotter (100 eV to 400 eV) plasma
• Slower compression time (100 µs to 4 ms) less compression ratio (10 to 7:1)
• Rotation stabilization of RT instability (1000 rpm)• Lower peak field (700 T to 100 T) and density (1e20 cm-3 to
1e17 cm-3)• Much more LINUS like
Change to slower liner, less peak energy density
8
Fusion Technology Comparison
1.00E+06
1.00E+09
1.00E+12
1.00E+15
1.00E+13 1.00E+16 1.00E+19 1.00E+22 1.00E+251.00E+02
1.00E+05
1.00E+08
1.00E+11
Driver PowerPlasma Energy
kJ
MJ
GJ
MW
GW
TW
$ Co
st o
f Con
finem
ent
$ Co
st o
f Driv
er
NIF
GF
Plasma Density (cm-3)
Magnetic Field (Tesla)
30 1.00E+3 3.00E+4 1.00E+6
Normal Super-
conductor HTC Max DCMax Flux
Compression
ITER
1
9
• We achieved much better confinement with spherical tokamak• Lack of toroidal field in edge of spheromak produce stochastic
field in the edge, fast electrons escape, poor confinement• Did not try FRC but I suspect the lack of toroidal there to also
cause poor confinement• Better bet to compress the pretty well known spherical
tokamak• Need central shaft, engineering pain but easier than
confinement pain• To compress spheromak or FRC need faster compression
because of poor confinement
Initial plasma spherical tokamak
10
General Fusion’s Solution
1. Inject Plasma Fuel 2. Compress Plasma Fuelv v
3. Extract Energyv
11
• Designing a ~1.5 m radius liquid lithium plasma formation and compression machine
• ~1MA of plasma current spherical tokamak starting plasma (MAST/NSTX class)
• Sub-breakeven but high performance (10 keV at 7e16 cm-3)• Still costing the machine but estimate ~100 M$• 3-5 years project• Will try to raise this money towards the end of this year
Next step
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