Magnetic field decay in model SSC dipoles

Conference · Mon Aug 01 00:00:00 EDT 1988

OSTI ID:6611913

Gilbert, W S; Althaus, R F; Barale, P J; Benjegerdes, R W; Green, M A; Green, M I; Scanlan, R M

We have observed that some of our model SSC dipoles have long time constant decays of the magnetic field harmonics with amplitudes large enough to result in significant beam loss, if they are not corrected. The magnets were run at constant current at the SSC injection field level of 0.3 tesla for one to three hours and changes in the magnetic field were observed. One explanation for the observed field decay is time dependent superconductor magnetization. Another explanation involves flux creep or flux flow. Data are presented on how the decay changes with previous flux history. Similar magnets with different Nb-Ti filament spacings and matrix materials have different long time field decay. A theoretical model using proximity coupling and flux creep for the observed field decay is discussed. 10 refs., 5 figs., 2 tabs.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: W-7405-ENG-48
• OSTI ID: 6611913
• Report Number(s): LBL-25139; CONF-880812-32; ON: DE89004791
• Resource Relation: Conference: Applied superconductivity conference, San Francisco, CA, USA, 21 Aug 1988; Other Information: Portions of this document are illegible in microfiche products
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
MAGNETIC FIELDS
INSTABILITY
SUPERCONDUCTING MAGNETS
SUPERCONDUCTING SUPER COLLIDER
TIME DEPENDENCE
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
MAGNETS
STORAGE RINGS
SUPERCONDUCTING DEVICES
430300* - Particle Accelerators- Auxiliaries & Components
420201 - Engineering- Cryogenic Equipment & Devices