Abstract
We have developed a protein crystal formation system, which can, on the ground, suppress convections, exerting magnetic forces on the solution including proteins. The protein formation system consists of a superconducting magnet system, protein crystallization cells, and observational equipment; the latter two devices are placed in the magnet bore. The superconducting magnet system includes two coil groups, each generating a magnetic field opposing in direction to each other. The product of magnetic flux density and its spatial gradient is proportional to the magnetic force and needs to be approximately 1400 T2/m in order to levitate water. The magnet is operated in persistent current mode. The crystallization cells are made of a transparent plastic on a plate. The experimental space and cells can be controlled between 4°C and 20°C. The observational equipment, which is a kind of periscope, enables in-situ observation of protein solution in high magnetic fields. In order to optimize experimental conditions, we have also carried out a simulation study based on a solution flow model.
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