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U. Konopka Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany New, Flexible Plasma.

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Presentation on theme: "U. Konopka Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, 85741 Garching, Germany New, Flexible Plasma."— Presentation transcript:

1 U. Konopka Max-Planck-Institut für Extraterrestrische Physik, Giessenbachstrasse, Garching, Germany New, Flexible Plasma Devices for Complex Plasma Experiments New, Flexible Plasma Devices for Complex Plasma Experiments Max-Planck-Institute for Extraterrestrial Physics

2 Why do we design new plasma chambers for complex plasma experiments ? 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.: PK3-Plus: Single parallel plate discharge (much more flexible and quality optimized) PK4: DC-Discharge tube (addresses different complex plasmas physics (i.e. flows)) PKE-Nefedov: Single parallel plate discharge IMPF-Predevelopment chambers: Spherical Chamber (capacitive)Spherical Chamber (inductive)Cylindrical Chamber (capacitive)

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

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

5 Spherical Chamber (capacitive) Spherical Chamber (inductive)

6 Labor experiences using the IMPF RF chamber Experimental setup Labor experiences using the IMPF RF chamber Experimental setup

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

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

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

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

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

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

13 Double RF-Electrode (maybe transparent) Single 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 – Elektrode modules

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

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

16 The Dodecahedron-Chamber – Background The attractive potential 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.

17 The Dodecahedron-Chamber - Concept 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 plasma generation (Example 2D)

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

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

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

21 Thanks for your attention. The Dodecahedron-Chamber


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