Test Results of the Thin Superconducting Solenoid for the CMD-3 Detector

• Published in: IEEE transactions on applied superconductivity Vol. 18; no. 2; pp. 399 - 402
• Main Authors: Bragin, A.V., Barkov, L.M., Karpov, S.V., Okhapkin, V.S., Popov, Y.S., Ruban, A.A., Smakhtin, V.P.
• Format: Journal Article
• Language: English
• Published: New York IEEE 01.06.2008; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Boiling; Bypasses; Coils (strip); Detector magnet; Detectors; Liquid helium; Magnetic fields; Niobium compounds; quench; Shunts; Solenoids; Superconducting cables; Superconducting coils; Superconducting epitaxial layers; Superconducting magnets; Superconductivity; Testing
• ISSN: 1051-8223; 1558-2515
• DOI: 10.1109/TASC.2008.921245

The superconducting solenoid is designed to provide 1.5 T magnetic field in the CMD-3 detector. Its dimensions are 0.7 m in diameter and 0.9 m in length. The superconducting coil is made of two layers of NbTi/Cu cable 0.87 mm in diameter. The solenoid is protected from quench by shunts, which are uniformly distributed along the coil. The total resistance of the shunts is about 40 . The superconducting coil has a minimal radiation thickness compared with other solenoids (0.085 ). The superconducting coil is indirectly cooled by liquid helium being in nucleate pool boiling state at 4.2 K. High purity aluminum strips were used to keep the solenoid at 4.2 K. The magnet system was tested for liquid helium efficiency. In May 2007, the solenoid, surrounded by a dummy iron yoke, was charged to its design current. The quench behavior of the solenoid is discussed.