By Frank Nürnberg, Mai 2010 -...
Transcript of By Frank Nürnberg, Mai 2010 -...
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Summary Warp Simulations
By Frank Nürnberg, Mai 2010
„Wenn Star Trek weiß
wie ein Warp Antrieb
gebaut wird, warum
baut den dann keiner
JETZT!?“
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Experiment Jan. 2010 @ Phelix
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Warp SetupL
ase
r
Ta
rge
t
Fla
ng
e
Fla
ng
e
So
len
oid
RCF1 @
405 mmRCF2 @
500 mm
mm 70 30 150 30 125 100
500 mm
16
4
8
1
6
80 m
m
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Source parameters
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Plasma and simulation criteria
Resolving plasma frequency: ωp · Δt < 1 → Volume source because of ne
→ Δt = 75 fs (680 steps = 51 ps), Δt = 1 ps (21000 steps)
Courant criterion: → Δt = 75 fs: Δs(Ep,max) = 5 µm, Δs(Ee=300 keV) = 17 µm → Δt = 1 ps: Δs(Ep,max) = 65 µm , Δs(Ee=300 keV) = 232 µm
Debye length→ grid→ convergence check: 1000/500/250/100 µm
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Self fields: off (top) /on (bottom)
Protons (left), electrons (right) Protons (left), electrons (right)
95 % of all protons get lost in the solenoid for both cases
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Beam neutrality: potential
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Convergence check - protons
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Convergence check - electrons
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Proton aggregation
Electrons
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Focus and collimation
2.7e+9
protons
7.1e+9
protons
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Emittance growth
10 mrad x 0.7 mm = 0.7 mm-mrad 200 mrad x 40 mm = 8000 mm-mrad 10 mrad x 40 mm = 400 mm-mrad
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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RCF stacks: with B and without B
3,43 MeV 6.16 MeV 8.18 MeV
11.27 MeV 13.9 MeV 16.2 MeV
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Warp simulation: RCF stack
3,43 MeV 6.16 MeV 8.18 MeV
11.27 MeV 13.9 MeV 16.2 MeV
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Comparison
#1: outer ring / inner ring / spot r = 21/9/2 mm
#2: halo / spot r = 6/2.5 mm
#3: ring: outer/inner r = 13.5/10 mm
#4: r = 23.5 mm
#5: r = 26.5 mm
#6: r = 28.5 mm
#1: outer ring / inner ring / spot r = 14/8/1.5 mm
#2: halo / spot r = 7/2.5 mm
#3: ring: outer/inner r = 11.8/7.4 mm
#4: r = 25 mm
#5: r = 26.8 mm
#6: r = 27.5 mm
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Warp simulation: comparison
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Dipole
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Dipole 140 mT, no solenoid
Transmission of electrons through the solenoid:
Without dipole: 4.7 % - with dipole: 4 %
With dipole and solenoid: 20.3 %
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Dipole 280 mT with solenoid
Transmission of electrons through the solenoid:
With dipole 140 mT and solenoid: 20.3 %
With dipole 280 mT and solenoid: 21.2 %
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Outlook
Optimizing setup for transmission
Dipole
Energyselection using 2 solenoids
Solenoid-drift-compression-focussing
Quadrupol triplett
1-D parameter
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |
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Results/ideas meeting
Check detector image if self-fields/solenoid-field off
Check initial expansion: potential, particles per cell, grid
Convergence check: decrease gid size AND increase particlenumber
Concentrate on energy window for collimation and focussing(save only particles in this window)
Energy conservation
Different initial electron distribution to avoid oscillations
05/07/2010 | Warp Summary, GSI | Frank Nürnberg |