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A recording fluxmeter, the idea of which was first proposed by Prof. Dicke and applied in the Chicago cyclotron, has been set up for the purpose of measuring the magnetic field distribution of the 16″ cyclotron now being built at the Institute of Science and Technology, University of Tokyo. Even a slight leak current exerts considerable influence on the behaviour of the circuit, therefore care was taken in this respect. Through proper arrangement, we can make A, the ratio of out put voltage V to current through galvanometer ig, equal to 10^<11> ohms resulting in the effective time constant T of 10^4sec. To overcome drift, we do not use "zero drift control," but instead adjust the relative position between galvanometer and phototube. The sensitivity obtained is about 1.5 gauss/volt and the over-all error is not more than a few percent. The stability is very high. The contents of this report is as follows : 1. Introduction, 2. Action of the circuit, a) general, b) how it acts when it is left without measurement, c) how it acts during measurement, d) problem of leak current, 3. Practical application of the circuit, 4. On the measurement and its accuracy, 5. How to design another recording flux meter under different circumstances, 6. Acknowledgement.
宇宙航空研究開発機構の論文
1955-02-25