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Transverse Impedance from Collimator Bench Measurements Using 1 Wire

This study presents the measurement of transverse impedance using a resonator method to analyze collimator characteristics. Two sweeps were conducted from +0.3 mm to +4.8 mm and -4.2 mm to +0.3 mm, revealing minor discrepancies due to positional uncertainties. The graphite collimator, measuring 192 cm in total length, demonstrated a full gap of 10 mm in the flat part. Measurements covered a frequency range from 57 MHz to 1.4 GHz, showing results parallel to previous findings. These measurements could not validate the new inductive bypass formalism due to frequency limitations.

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Transverse Impedance from Collimator Bench Measurements Using 1 Wire

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  1. 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

  2. Driving + detuning impedance Deduced from measurements From theory (only the 1 m long flat part)

  3. MEASURED LONGITUDINAL IMPEDANCE VS. TRANSVERSE OFFSET 20 pictures (from 57 MHz to 1.4 GHz)

  4. 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

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