変調イオン電流ゲージ

概要

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The pressure in a beam pipe of the 12 GeV proton synchrotron of National Laboratory for High Energy Physics has been measured with a high accuracy by the new developed modulating ion current gauge (MIC-G). The output signal of the gauge head was sent to the sub-control room of the synchrotron by a 120 m long cable and the measurement was carried out when a proton beam was accelerated in the synchrotron. The gauge head has a modulator electrode between an ionization region and an ion collector to modulate the ion current. The modulated signal is sent to an amplifier with a double shielded cable and then it is amplified and detected with a phase sensitive detector (PSD). This method can reduce externally induced noise and the influences of desorbed ions by a electron impact from an anode electrode and of X-ray photoelectric currents from an ion collector can be also avoided.
日本真空協会の論文