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mimic
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http://www.doc.ic.ac.uk/~mpj01/ise2grp/energystorage_report/node8.html" ah just what i need for that Superconducting Railgun project 
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ZapperZ said:
Superconducting Magnetic Energy Storage (SMES) is a technology that stores electrical energy in the form of a magnetic field created by the flow of direct current in a superconducting coil. This stored energy can be released back into the power grid when needed.
SMES works by using a superconducting coil that is cooled to extremely low temperatures, usually around -452°F (-269°C) using liquid helium. This supercooled coil has zero electrical resistance, allowing it to store large amounts of energy in the form of a magnetic field.
SMES has several benefits, including high energy density, fast response time, and high efficiency. It can also help stabilize the power grid by providing quick injections of energy during times of high demand, reducing the need for additional power plants.
SMES can be used in various applications, including grid stabilization, load leveling, and backup power for critical facilities. It can also be integrated into renewable energy systems to store excess energy for later use.
One limitation of SMES is its high cost, as it requires expensive materials and infrastructure to operate. It also has limited storage capacity compared to other energy storage technologies. Additionally, the cryogenic cooling system requires constant maintenance and can be vulnerable to external factors such as earthquakes or power outages.