Pant, K. and Arora, P. and Yadav, S. and Sengupta, A. (2011) Generation of Quadrupole Magnetic Field for Trapping Atoms in Cs Fountain being Developed at NPL India. MAPAN - Journal of Metrology Society of India, 26 (4). pp. 285-294. ISSN 0974-9853

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Abstract

We describe the development of a constant current source for magneto-optical trap (MOT) coils. The system is designed to supply maximum 5 A current in continuous or pulsed mode to the anti- Helmholtz (AH) coils which produce quadrupole magnetic field inside the chamber for trapping of Cs atoms. To obtain a stable field gradient the coils are operated at low current to minimize current fluctuations. With AH coils having 100 turns and 5 Ù resistances, we achieved rise and fall times of current as 5 ms and 7 ms, respectively. With a field gradient of 6 G/cm at the center of the MOT, number of atoms trapped is about 107. To prevent burning of coils due to failure of current source, a thermal protection circuit has been incorporated. Measurements made for switching times of current profile in coils is also reported.

Item Type:	Article
Additional Information:	Copyright for this article belongs to M/s Springer Verlag.
Subjects:	Instruments/ Instrumentation Applied Physics/Condensed Matter Physics
Divisions:	UNSPECIFIED
Depositing User:	Mr. Abhishek Yadav
Date Deposited:	26 Dec 2012 09:15
Last Modified:	26 Dec 2012 09:15
URI:	http://npl.csircentral.net/id/eprint/914

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