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TRANSVERSE IMPEDANCE FROM COLLIMATOR BENCH MEASUREMENTS USING 1 WIRE. Elias Métral. Only the real part of the impedance measured directly as the resonator method was used by F. Caspers and T. Kroyer
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TRANSVERSE IMPEDANCE FROM COLLIMATOR BENCH MEASUREMENTS USING 1 WIRE Elias Métral • Only the real part of the impedance measured directly as the resonator method was used by F. Caspers and T. Kroyer • 2 sweeps done (on 23/06/2005): 1st sweep from offset +0.3 mm to +4.8 mm, and 2nd sweep from -4.2 mm to +0.3 mm The offset +0.3 mm is obtained twice (small discrepancy observed due to drifts and uncertainty of the jaw position) • Dimensions of the graphite collimator • Length of the jaw = 120 cm (100 cm flat and 10 cm section with widening aperture on either side) • Full gap of the flat part = 10 mm • Then there were flanges etc, so in the end the resonator was 192 cm long. The measured data are for the full length
Driving + detuning impedance Deduced from measurements From theory (only the 1 m long flat part)
MEASURED LONGITUDINAL IMPEDANCE VS. TRANSVERSE OFFSET 20 pictures (from 57 MHz to 1.4 GHz)
Conclusion • Results very similar to the ones already obtained by FZ on 17/07/05 • These measurements CANNOTCONFIRM that the new formalism (with the “inductive bypass”) is true, as the frequency range is too high (from 57 MHz to 1.4 GHz) Classical regime only! Interesting frequency range
