Zhao, Y. Du, Y.Y. Wang, L. JACoW Publishing Geneva, Switzerland 978-3-95450-201-1 10.18429/JACoW-IBIC2018-MOPC10 English 134-136 MOPC10 electron electronics simulation vacuum power-supply Contribution to a conference proceedings 2019 2019-01 https://doi.org/10.18429/JACoW-IBIC2018-MOPC10 http://jacow.org/ibic2018/papers/mopc10.pdf The CT based on TMR sensor has been developed in the lab. For Improving the accuracy and linearity, re-ducing the influence of sensor position, a series simu-lation and calculation have been done which conduct an upgrade both in the mechanical structure and elec-tronics design. Lab test shows good results and test on beam will be carried on soon.