Author: Inagaki, T.
Paper Title Page
TUP32 Differential Current Transformer for Beam Charge Monitoring in Noisy Environments 304
  • H. Maesaka, T. Inagaki
    RIKEN SPring-8 Center, Hyogo, Japan
  • H. Dewa, T. Inagaki, H. Maesaka, K. Yanagida
    JASRI, Hyogo, Japan
  • K. Ueshima
    QST, Sendai, Miyagi, Japan
  We developed a differential current transformer (CT) for electron beam charge measurement in noisy environments, such as near high-power pulse sources. This CT has four pickup wires coiled at equal intervals (90 deg.) on a toroidal core and each coil is wound for two turns. The midpoint of the coil is connected to the body ground so that a balanced differential signal is generated at both ends. A beam pipe with a ceramics insulation gap is inserted into the toroidal core to obtain a signal from a charged-particle beam. The four pairs of signals are transmitted through a CAT6 differential cable and fed into differential amplifiers. The common-mode noise from the noisy ground at the CT is canceled out by the amplifier. The four signals are then summed and digitized by an AD converter. We produced differential CTs and installed them into the new injector linac of NewSUBARU (*). Before the installation, the frequency response was measured in a laboratory and a flat response of up to 100 MHz was obtained as expected. Common-mode noise cancellation was also confirmed at NewSUBARU and the CTs have been utilized for beam charge monitoring stably.
*: T. Inagaki et al., ’Construction of a Compact Electron Injector Using a Gridded RF Thermionic Gun and a C-Band Accelerator’, in Proc. IPAC’21, pp. 2687-2689. doi:10.18429/JACoW-IPAC2021-WEPAB039
poster icon Poster TUP32 [1.393 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2022-TUP32  
About • Received ※ 07 September 2022 — Revised ※ 10 September 2022 — Accepted ※ 11 September 2022 — Issue date ※ 26 October 2022
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