New, „Flexible“ Plasma Devices for Complex Plasma Experiments Max-Planck-Institute for Extraterrestrial Physics New, „Flexible“ Plasma Devices for Complex Plasma Experiments U. Konopka Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany email: konopka@mpe.mpg.de

Why do we design new plasma chambers for complex plasma experiments ? With the new setups we would like to reach experimental conditions that go far beyond what can be established with former designs as i.e.: PKE-Nefedov: Single parallel plate discharge PK3-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)

Spherical Chamber (inductive) Spherical Chamber (capacitive) Experiences from the IMPF (Pre-)Developments Spherical Chamber (inductive) Spherical Chamber (capacitive) B RF-1

Spherical Chamber (inductive) Spherical Chamber (capacitive) Experiences from the IMPF (Pre-)Developments Spherical Chamber (inductive) Spherical Chamber (capacitive) RF-2 RF-3 Random switched RF parallel plate discharge RF-1

Spherical Chamber (inductive) Spherical Chamber (capacitive) Experiences from the IMPF (Pre-)Developments Spherical Chamber (inductive) Spherical Chamber (capacitive)

Labor experiences using the IMPF RF chamber Experimental setup

Labor experiences using the IMPF RF chamber A Transparent Top Electrode A transparent (ITO-covered) conducting (RF) top electrode was introduced. camera a single particle camera New single electrode (Ø ≈ 80mm, groove Ø ≈ 40 mm, 1 mm depth) used for potential measurements, single particle manipulation

Labor experiences using the IMPF RF chamber The Electrode System α y x Fc(x)= mg·sin(α) mg

Goals for removing former constrains and their implications? Limited plasma parameter range: Range Main range implications Electron temperature (Te) 2-3 eV (non-adjustable) 0.1 - 6 eV (adjustable) × 40 Q × 40 Γ × 1600 Plasma density (ni, ne) 1014 - 1016 m-3 1013 - 1017 m-3 × 100 Δ × 10 nd × 1000 Neutral pressure (p) 10 - 200 Pa 0.1 - 1000 Pa × 500 γ × 500 × 2×106 Limited system geometries: Void, Ellipsoids Adaptive, Multi-Clouds Limited manipulation devices: Function generator Adaptive Elec., Laser Twizers,.. Limited interaction variation: Debye-Hückel Designer-Potential (attractive)

Two new design approaches will be studied Zyflex - Chamber Zyflex - Chamber Dodecahedron - Chamber Flexible plasma chamber with quasi spherical geometry and timeaveraged isotropic plasma structure Flexible, parallel plate discharge chamber with improved electrode setups

The Zyflex-Chamber - Concept Variable shower head/electrode holder combination Modular parallel plate electrode system

The Zyflex-Chamber – Gasflow and Plasmastructure for pumping and dust removal

The Zyflex-Chamber – Elektrode modules Single RF-Electrode (maybe transparent) Double RF-Electrode (maybe transparent) Adaptive RF-Electrode Double DC-RF Combi Electrode Adaptive DC-RF Combi Electrode (maybe with second grid for active electron temperature control)

The Zyflex-Chamber - Implications Extended plasma parameter range (√) Extended system geometries √ Extended manipulation devices √ Extended interaction variation (√)

Two new design approaches will be studied Zyflex - Chamber Zyflex - Chamber Dodecahedron - Chamber Flexible plasma chamber with quasi spherical geometry and timeaveraged isotropic plasma structure Flexible, parallel plate discharge chamber with improved electrode setups

The Dodecahedron-Chamber – Background The attractive potential Ion flow and ion-wake-potential in 2D In the limit of smooth angular Variation of the ion flow the timeaveraged potential will be quasi spherical. With increasing pressure the crytical angle for a smooth potential is increasing. With a smooth controllable ion flow direction, even dedicated non spherical Potentials might be established. – Disadvantage: Orientation is globally fixed.

The Dodecahedron-Chamber - Concept The plasma generation (Example 2D) DC RF The real chamber should be driven by 12 independend rf-generators that can be individually shifted in phase, have different, programmable output power as well as an arbitrary DC-offset – everthing software controlled (>10kHz).

The Dodecahedron-Chamber - Concept The plasma generation DC RF Timeaveraged quasi isotropic plasma in 2D/3D – Dodecahedron geometry But, why a dodecahedron?

The Dodecahedron-Chamber - Concept The plasma generation DC RF By continuous dc-voltage control the Ion-drag should be smoothed directionable Time averaged 3D

The Dodecahedron-Chamber Extended plasma parameter range √! Extended system geometries (√) Extended manipulation devices √ Extended interaction variation √!

The Dodecahedron-Chamber Thank‘s for your attention.