(Acoustic emission diagnostic techniques for high-field high current-density super inducting poles)
Acoustic emission technology was introduced in the late 1970's to monitor superconducting magnets. It has now been firmly established that acoustic signals in superconducting magnets are emitted principally by mechanical events such as conductor strain, conductor motion, frictional motion, and epoxy cracking. Despite earlier suggestions, flux motion, except during flux jumping, does not appear to be an important source of AE signals in superconducting magnets. Of these several potential sources of AE signals in superconducting magnets, mechanical disturbances have been identified to be most important in high-performance, adiabatic'' magnets such as the dipoles used in accelerators. These mechanical disturbances are transitory, each generating a packet of AE signals that can be located with sensors. Source identification and location has been achieved with a number of superconducting magnets. In this section, the basic principle for the operation of adiabatic magnets is discussed, followed by presentation of some of the important experimental results relevant to the question of premature quench obtained at MIT.
- Research Organization:
- Massachusetts Inst. of Tech., Cambridge, MA (USA). Plasma Fusion Center
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC02-83ER40121
- OSTI ID:
- 7070493
- Report Number(s):
- DOE/ER/40121-T3; ON: DE90007400; TRN: 90-007113
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
70 PLASMA PHYSICS AND FUSION TECHNOLOGY
SUPERCONDUCTING MAGNETS
ACOUSTIC EMISSION TESTING
CRACKING
EPOXIDES
MAGNETIC DIPOLES
SUPERCONDUCTING SUPER COLLIDER
ACOUSTIC TESTING
CHEMICAL REACTIONS
DECOMPOSITION
DIPOLES
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
MAGNETS
MATERIALS TESTING
MULTIPOLES
NONDESTRUCTIVE TESTING
ORGANIC COMPOUNDS
ORGANIC OXYGEN COMPOUNDS
PYROLYSIS
STORAGE RINGS
SUPERCONDUCTING DEVICES
TESTING
THERMOCHEMICAL PROCESSES
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