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Several Experimental Results on the Stability of Cs-Optical Pumping Magnetometer with Some Discussions
Tests of the stability of the Cs-optical pumping magnetometer as well as some related fundamental experiments have been carried out. In this paper, their important results are shown and discussed mainly about several operating. conditions of the Cs-magnetometer for its stability including some comparison with the theoretical results which have to been led by Bloom, Kubo, etc. Main results of the present study are as follows;
1) The resonant (self oscillating) out put frequency is shifted depending closely upon the open air temperature. This shift is generated mainly by temperature characteristics of the sensor electronics.
2) Temperature shifts of the order of 0.3γ/℃ are observed as regards the lamp house and the absorption cell. So it is necessary that the sensor should be kept its seting temperature within the range of ±0.1℃.
3) The transverse relaxation time is estimated as about 2.8 ms. This value is rather smaller for the stability of the Cs-magnetometer.
4) Almost all of these experimental results can be nearly explained by the theoretical results.
5) It is fined out that there are a few defects of the sensor electronics and they are main origins of the above temperature dependence of the out put frequency of the Cs-magnetometer.
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