Issues and results in the development of 2. 5 micron filament strand for the HEB

Conference · Fri Mar 01 00:00:00 EST 1991

OSTI ID:5633538

Seuntjens, J M; Capone, III, D W

The High Energy Booster (HEB) ring which injects protons into the Superconducting Super Collider (SS) will be ramped with a cycle time on the order of 8 minutes. The current magnet design incorporates a strand with 2.5 {mu}m filaments to reduce the AC loss heating component due to the magnetization hysteresis. The reduced magnetization also makes the correction of the sextupole moment easier. Past experience has shown that Nb-Ti filaments in a copper matrix should have a spacing-to-diameter ratio (s/d) of 0.15 for good fabricability. For 2.5 {mu}m filaments, this results in a spacing on the order of 0.4 {mu}m at final wire size. A Cu-Mn alloy has replaced the copper between the filaments in prototype conductors to effectively eliminate proximity coupling between 2.5 {mu}m filaments which would otherwise occur with copper at this spacing. The resistivity of the material between the filaments is limited by the mean free path being equal to the filament spacing: therefore, cryogenic stability has not been compromised. This paper discusses design and process parameters in the development of 2.5 {mu}m filament conductor production. Data from current 2.5 {mu}m work from several vendors, some of which are on FFP-type contracts sponsored by the SSCL, are included to demonstrate how close industry is to meeting 2.5 {mu}m conductor needs. If the SSCL were unable to bring 2.5 {mu}m conductor into production within about two years' time, a fall-back HEB design with 6 {mu}m filament conductor would be utilized. Therefore, a strong emphasis on manufacturability is reflected in the key issues. The sole purpose of this paper is to establish a common level of understanding of fine filament needs of the SSC; therefore, the data will be purposely presented without vendor affiliation. The authors have paid careful attention to details to avoid the release of proprietary information in this paper. 6 refs., 3 figs., 1 tab.

• Research Organization: Superconducting Super Collider Lab., Dallas, TX (USA)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC02-89ER40486
• OSTI ID: 5633538
• Report Number(s): SSCL-365; CONF-910340-15; ON: DE91012588
• Resource Relation: Conference: 3. annual international industrial symposium on the super collider (IISSC), Atlanta, GA (USA), 13-15 Mar 1991
• Country of Publication: United States
• Language: English

Related Subjects

43 PARTICLE ACCELERATORS
PARTICLE BOOSTERS
SUPERCONDUCTING MAGNETS
SUPERCONDUCTING WIRES
DESIGN
FABRICATION
MECHANICAL PROPERTIES
SUPERCONDUCTING SUPER COLLIDER
ELECTRICAL EQUIPMENT
ELECTROMAGNETS
EQUIPMENT
MAGNETS
STORAGE RINGS
SUPERCONDUCTING DEVICES
WIRES
430300* - Particle Accelerators- Auxiliaries & Components