Presentation on theme: "New, „Flexible“ Plasma Devices for Complex Plasma Experiments"— Presentation transcript:
1 New, „Flexible“ Plasma Devices for Complex Plasma Experiments Max-Planck-Institute for Extraterrestrial PhysicsNew, „Flexible“ Plasma Devices forComplex Plasma ExperimentsU. KonopkaMax-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, Garching, Germany
2 Why do we design new plasma chambers for complex plasma experiments ? With the new setups we would like to reach experimental conditions that gofar beyond what can be established with former designs as i.e.:PKE-Nefedov: Single parallel plate dischargePK3-Plus: Single parallel plate discharge(much more flexible and quality optimized)PK4: DC-Discharge tube(addresses different complex plasmas physics (i.e. flows))IMPF-Predevelopment chambers:Cylindrical Chamber (capacitive)Spherical Chamber (inductive)Spherical Chamber (capacitive)
3 Spherical Chamber (inductive) Spherical Chamber (capacitive) Experiences from the IMPF (Pre-)DevelopmentsSpherical Chamber (inductive)Spherical Chamber (capacitive)BRF-1
5 Spherical Chamber (inductive) Spherical Chamber (capacitive) Experiences from the IMPF (Pre-)DevelopmentsSpherical Chamber (inductive)Spherical Chamber (capacitive)
6 Labor experiences using the IMPF RF chamber Experimental setup
7 Labor experiences using the IMPF RF chamber A Transparent Top ElectrodeA transparent (ITO-covered) conducting (RF) top electrode was introduced.cameraa singleparticlecameraNew single electrode (Ø ≈ 80mm, groove Ø ≈ 40 mm, 1 mm depth)used for potential measurements, single particle manipulation
8 Labor experiences using the IMPF RF chamber The Electrode SystemαyxFc(x)=mg·sin(α)mg
9 Goals for removing former constrains and their implications? Limited plasma parameter range:RangeMain range implicationsElectron temperature (Te)2-3 eV (non-adjustable) eV (adjustable)× 40Q × 40Γ × 1600Plasma density (ni, ne)m m-3× 100Δ × 10nd × 1000Neutral pressure (p)Pa Pa× 500γ × 500× 2×106Limited system geometries: Void, Ellipsoids Adaptive, Multi-CloudsLimited manipulation devices: Function generator Adaptive Elec., Laser Twizers,..Limited interaction variation: Debye-Hückel Designer-Potential (attractive)
10 Two new design approaches will be studied Zyflex - ChamberZyflex - ChamberDodecahedron - ChamberFlexible plasma chamber with quasi spherical geometry and timeaveraged isotropic plasma structureFlexible, parallel plate discharge chamber with improved electrode setups
11 The Zyflex-Chamber - Concept Variable shower head/electrode holder combinationModular parallel plate electrode system
12 The Zyflex-Chamber – Gasflow and Plasmastructure for pumping anddust removal
13 The Zyflex-Chamber – Elektrode modules Single RF-Electrode (maybe transparent)Double RF-Electrode (maybe transparent)Adaptive RF-ElectrodeDouble DC-RF Combi ElectrodeAdaptive DC-RF Combi Electrode(maybe with second grid for active electron temperature control)
14 The Zyflex-Chamber - Implications Extended plasma parameter range (√)Extended system geometries √Extended manipulation devices √Extended interaction variation (√)
15 Two new design approaches will be studied Zyflex - ChamberZyflex - ChamberDodecahedron - ChamberFlexible plasma chamber with quasi spherical geometry and timeaveraged isotropic plasma structureFlexible, parallel plate discharge chamber with improved electrode setups
16 The Dodecahedron-Chamber – Background The attractive potential Ion flow and ion-wake-potential in 2DIn the limit of smooth angularVariation of the ion flow thetimeaveraged potential will bequasi spherical.With increasing pressure thecrytical angle for a smoothpotential is increasing.With a smooth controllable ion flow direction, even dedicated non sphericalPotentials might be established. – Disadvantage: Orientation is globally fixed.
17 The Dodecahedron-Chamber - Concept The plasma generation (Example 2D)DCRFThe real chamber should be driven by 12 independend rf-generators thatcan be individually shifted in phase, have different, programmable outputpower as well as an arbitrary DC-offset – everthing software controlled (>10kHz).
18 The Dodecahedron-Chamber - Concept The plasma generationDCRFTimeaveraged quasi isotropic plasma in 2D/3D – Dodecahedron geometryBut, why a dodecahedron?
19 The Dodecahedron-Chamber - Concept The plasma generationDCRFBy continuous dc-voltagecontrol the Ion-drag shouldbe smoothed directionableTime averaged3D
20 The Dodecahedron-Chamber Extended plasma parameter range √!Extended system geometries (√)Extended manipulation devices √Extended interaction variation √!
21 The Dodecahedron-Chamber Thank‘s for your attention.