Large magnetic field system capable of being controlled at high precision and turned off quickly
A high-precision and fast technology, applied in the field of large magnetic field systems, which can solve the problems of uncontrollability and slow shutdown of large magnetic field systems
Pending Publication Date: 2021-07-06
INNOVATION ACAD FOR PRECISION MEASUREMENT SCI & TECH CAS
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Problems solved by technology
[0003] The purpose of the present invention is to address the deficiencies of the prior art and provide a high-precision control and fast shutdown large magnetic field system, which solves the problem of slow shutdown and uncontrollable shutdown of the large magnetic field system, and has a simple structure and strong operability ,High precision
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[0017] In order to facilitate those of ordinary skill in the art to understand and implement the present invention, the present invention will be described in further detail below in conjunction with the examples. It should be understood that the implementation examples described here are only used to illustrate and explain the present invention, and are not intended to limit the present invention.
[0018] Such as figure 1 As shown, a high-precision control and fast turn-off large magnetic field system includes a current source, an external control module for the current source, an IGBT switch module, a MOSFET current control module, and a Feschbach coil. The IGBT switch module includes an insulated gate bipolar transistor, a first varistor and a second varistor,
[0019] The Feshbach coil is connected in parallel with the first varistor, one end of the Feshbach coil is connected with one end of the current source, and the other end is connected with the collector of the IGBT...
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The invention discloses a large magnetic field system capable of being controlled with high precision and turned off quickly. An IGBT switch module comprises an insulated gate bipolar transistor, a first piezoresistor and a second piezoresistor, the drain electrode of a field effect transistor is connected with the emitter electrode of the insulated gate bipolar transistor, the drain electrode and the source electrode of the field effect transistor are connected with a third piezoresistor in parallel, The Feshbach coil comprises a first Helmholtz coil and a second Helmholtz coil, both the first Helmholtz coil and the second Helmholtz coil are formed by winding copper pipes, and both the first Helmholtz coil and the second Helmholtz coil are provided with water inlet holes and water outlet holes. According to the invention, the piezoresistor is used for dissipation, and the insulated gate bipolar transistor is combined to realize rapid turn-off of a large magnetic field; a PID controller is used for feeding back the current in the Feshbach coil so as to control the current; and the output voltage of the current source is externally controlled, so that two or more parallel current sources output different voltages under different currents.
Description
technical field [0001] The invention relates to the technical field of large magnetic field control, in particular to a large magnetic field system capable of high-precision control and rapid shutdown. Background technique [0002] Since the birth of Bose-Einstein condensate in 1995, the research on ultra-cold gas has shown unprecedented development, and the generation of Feshbach resonance technology allows people to control the interaction between atoms, which is in the realization of ultra-cold gas. Quantum degeneracy, BEC condensation of molecules and BCS superfluidity have been widely used. In order to accurately control and quickly detect the interaction between atoms, a magnetic field system with high precision control and fast shutdown is required experimentally. Different atoms have different requirements on the strength of the magnetic field. The control of the small magnetic field system is relatively simple, while the large magnetic field is relatively difficult...
Claims
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Login to View More IPC IPC(8): H03K17/041H03K17/687
CPCH03K17/041H03K17/687
Inventor 王璐严祥传闵靖孙大立
Owner INNOVATION ACAD FOR PRECISION MEASUREMENT SCI & TECH CAS