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Performance of a hot-cathode-ionization-gauge head with correcting electrode and shield tube, operated with an automated-pressure-compensating circuit in a synchrotron radiation environment
Experimental setup at Beam Line No. 5 (BL5) in the New SUBARU electron storage ring. Synchrotron radiation (SR) produced in the bending magnet (BM5) is absorbed by the photon absorber.
Indicated pressures with the BA-S3 (엯), the IKR070 with the gauge shield (▵), the NIG-2F (◆), and the IKR070 without the gauge shield (▴), as a function of the stored-electron-beam current at a beam energy of . Also note the emission current changes in the NIG-2F.
(a) Detected currents at the anode of the IKR070, with the gauge shield including the gauge cable (▵) when the anode was not powered by the TPG300, and detected currents at the collector of the NIG-2F (◆) when was applied to the grid, without emission from the gauge filament, as a function of the stored-electron-beam current. (b) Detected current at the grid (applied voltage of ) of the NIG-2F as a function of the stored-electron-beam current.
Available and unavailable pressure ranges for the developed gauge system in the ring as a function of the stored-electron-beam current, calculated using the results in Fig. 3(a), where the border is obtained using the reduction factor of the shield tube, 0.1 and the soft x-ray limit of the gauge system is .
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