GG (Galileo Galilei) Test of the Equivalence Principle to 10-17
GG (Galileo Galilei) Test of the Equivalence Principle to 10-17
GG (Galileo Galilei) Test of the Equivalence Principle to 10-17
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Measurement <strong>of</strong> electric patch effects (III)• No modeling needed, very meat measurement• You measure directly <strong>the</strong> effect <strong>of</strong> patch charges on <strong>the</strong> tests masses• We have done with <strong>GG</strong>G spinning for <strong>10</strong>.6 d, <strong>to</strong> measure time variation <strong>of</strong> patch effectamplitude….Note: <strong>the</strong> effect <strong>of</strong> <strong>the</strong> patch, inaddition <strong>to</strong> being brought <strong>to</strong> <strong>the</strong>frequency <strong>of</strong> <strong>the</strong> applied potential isalso amplified by <strong>the</strong> fac<strong>to</strong>r:4 V / VappliedpatchHere it is about 500⇒ <strong>the</strong> effect <strong>of</strong> patch charges (nocoating at all) on <strong>GG</strong>G testmasses, close <strong>to</strong> diurnalfrequency is a few picometers(<strong>GG</strong> target requires <strong>to</strong> measure0.5 picometer)
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