title: A modified Bitter-type electromagnet and control system for cold atom experiments.
abstract: We present a modified Bitter-type electromagnet which features high magnetic field, fine electronic properties and efficient heat removal. The electromagnet is constructed from a stack of copper layers separated by mica layers that have the same shape. A distinctive design of cooling channels on the insulating layers and the parallel ducts between the layers ensures low resistance for cooling water to flow. A continuous current control system is also made to regulate the current through the electromagnet. In our experiment, versatile electromagnets are applied to generate magnetic field and gradient field. From our measurements, a peak magnetic field of 1000 G and a peak gradient field of 80 G/cm are generated in the center of the apparatuses which are 7 cm and 5 cm away from the edge of each electromagnet with a current of 230 A and 120 A, respectively. With the effective feedback design in the current control system and cooling water flow of 3.8 l/min, the stability of the current through the electromagnets can reach 10(-5).
authors.affiliation: School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, People's Republic of China.
authors.forename: Tian
authors.initials: T
authors.lastname: Luan
authors.affiliation: School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, People's Republic of China.
authors.forename: Tianwei
authors.initials: T
authors.lastname: Zhou
authors.affiliation: School of Electronics Engineering and Computer Science, Peking University, Beijing 100871, People's Republic of China.
authors.forename: Xuzong
authors.initials: X
authors.lastname: Chen
authors.affiliation: Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, People's Republic of China.
authors.forename: Zhaoyuan
authors.initials: Z
authors.lastname: Ma
mesh_terms: D000538:Aluminum Silicates / Q000737:chemistry; D003080:Cold Temperature; D003300:Copper / Q000737:chemistry; D004867:Equipment Design; D060526:Magnetic Fields; D059346:Magnets / Q000737:chemistry
chemical_list: D000538:Aluminum Silicates; D003300:Copper; C011934:mica