title: Development of a low-drift integrator system on the HL-2A tokamak.
abstract: In this work, we developed a new integrator system with low-drift and small integration time constant less than 1 ms, which applies to the weak signals from magnetic measurements. This integrator system is designed on the basis of the analog drift compensation and the real-time digital correction of residual drift. The analog drift compensation is achieved by the subtraction between two integrators and the digital correction method is available due to the stability of integral drift in short time scale. The algorithm of the residual drift calculation and correction is implemented by the field programmable gate array. The integral drift can be well compensated within 10 mV/10 s at RC = 0.5 ms and meet the requirements of magnetic diagnostic on HL-2A.
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, People's Republic of China.
authors.forename: Yuan
authors.initials: Y
authors.lastname: Xu
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, People's Republic of China.
authors.forename: Xiaoquan
authors.initials: X
authors.lastname: Ji
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, People's Republic of China.
authors.forename: Qingwei
authors.initials: Q
authors.lastname: Yang
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, People's Republic of China.
authors.forename: Tengfei
authors.initials: T
authors.lastname: Sun
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, People's Republic of China.
authors.forename: Baoshan
authors.initials: B
authors.lastname: Yuan
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, People's Republic of China.
authors.forename: Shaoyong
authors.initials: S
authors.lastname: Liang
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, People's Republic of China.
authors.forename: Leilei
authors.initials: L
authors.lastname: Ren
authors.affiliation: Southwestern Institute of Physics, Chengdu 610041, People's Republic of China.
authors.forename: Jian
authors.initials: J
authors.lastname: Zhou