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Open questions about homogeneous fluid dynamos: The VKS experiment

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Figure

Fig. 1. Sodium loop. 1 – experimental platform, 2 – sodium tank (270 liters), 3, 4 – motors and flow vessel, 5 – sodium purifying unit, 6 – control unit, 7 – argon circuit command.
Fig. 2. Experimental set-up. Poloidal ( a ) and toroidal ( b ) components of the time averaged velocity profile in the counter-rotating von K´ arm´ an flow measured from LDV in a prototype water experiment with dics of 38 cm diameter and curved blades [42]
Fig. 3. Ω effect. (a): sketch of the induction mechanims and induced currents; (b):
Fig. 4. α effect in the case of a single rotating disc (the same disc as in Fig. 3). (a):
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