Figure 3

The R _wall of ³⁹K-⁸⁵Rb-⁴He and ¹³³Cs-⁸⁵Rb-⁴He magnetometers vary with the number density of buffer gas ⁴He and quench gas N₂, pumping rate of pump beam, cell temperature and cell effective radius. (a) \({R}_{wall-K-Rb-He}^{Rb-He},{R}_{wall-K-Rb-He}^{Rb-He-N2},{R}_{wall-Cs-Rb-He}^{Rb-He}\,{\rm{and}}\,{R}_{wall-Cs-Rb-He}^{Rb-He-N2}\) decrease when ⁴He atom number density n _He increases, \({R}_{wall-K-Rb-He}^{Rb-N2}\,{\rm{and}}\,{R}_{wall-Cs-Rb-He}^{Rb-N2}\) increase slowly with increasing ⁴He atom number density. (b) \({R}_{wall-K-Rb-He}^{Rb-N2},{R}_{wall-K-Rb-He}^{Rb-He-N2},{R}_{wall-Cs-Rb-He}^{Rb-N2}\,{\rm{and}}\,{R}_{wall-Cs-Rb-He}^{Rb-He-N2}\) decrease as n _N2 increases, \({R}_{wall-K-Rb-He}^{Rb-He}\,and\,{R}_{wall-Cs-Rb-He}^{Rb-He}\) increase slowly when n _N2 increases. (c) \({R}_{wall-K-Rb-He}^{Rb-He},{R}_{wall-K-Rb-He}^{Rb-N2},\) \({R}_{wall-K-Rb-He}^{Rb-He-N2},{R}_{wall-Cs-Rb-He}^{Rb-He},{R}_{wall-Cs-Rb-He}^{Rb-N2}\,{\rm{and}}\,{R}_{wall-Cs-Rb-He}^{Rb-He-N2}\) decreases slowly when pumping rate of pump beam increases. (d) \({R}_{wall-K-Rb-He}^{Rb-N2},{R}_{wall-K-Rb-He}^{Rb-He-N2},{R}_{wall-Cs-Rb-He}^{Rb-N2}\,{\rm{and}}\) \({R}_{wall-Cs-Rb-He}^{Rb-He-N2}\) increase rapidly, \({R}_{wall-K-Rb-He}^{Rb-He}\,{\rm{and}}\,{R}_{wall-Cs-Rb-He}^{Rb-He}\) increase slowly when T increases. (e) \({R}_{wall-K-Rb-He}^{Rb-He},{R}_{wall-K-Rb-He}^{Rb-N2},\) \({R}_{wall-K-Rb-He}^{Rb-He-N2},{R}_{wall-Cs-Rb-He}^{Rb-He},{R}_{wall-Cs-Rb-He}^{Rb-N2}\,{\rm{and}}\,{R}_{wall-Cs-Rb-He}^{Rb-He-N2}\) decreases rapidly when the cell effective radius increases. The R _wall of ³⁹K-⁸⁵Rb-⁴He magnetometer is bigger than the one of ¹³³Cs-⁸⁵Rb-⁴He magnetometer.