Optimization of pick-up coils for weakly damped SQUID gradiometers

Yang Kang^{1, 2, 3}, Wang Jialei^{1, 2, 3}, Kong Xiangyan^{1, 2, 3, †}, Yang Ruihu^{1, 2, 3}, Chen Hua^{1, 2, 3}

(color online) Simulated and measured results of (a) SNR, (b) sensitivity, and (c) spatial resolution. The black and red solid lines are the simulated results for b = 50 mm and b = 70 mm, respectively. The dots with the same color represent the corresponding measured results.