Field Mapper for Superconducting Torus Magnet for the Jefferson Lab 12GeV Upgrade

Conference · Thu Jun 01 00:00:00 EDT 2017

DOI:https://doi.org/10.2172/1985996· OSTI ID:1985996

Rajput-Ghoshal, Renuka ^[1]; Fair, Ruben ^[1]; Meyers, Joseph ^[1]; Beck, J. ^[1]; Brakman, David ^[2]; Wiggins, Cyril ^[1]; Newton, Joseph ^[3]; Mestayer, Mac ^[1]; Taylor, William ^[1]

---

1. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
2. Univ. of Richmond, VA (United States)
3. Old Dominion Univ., Norfolk, VA (United States)

As part of the Jefferson Lab 12 GeV upgrade, the Hall B magnet system requires two conduction cooled superconducting magnets ? a Torus and a Solenoid. The Torus consists of 6 trapezoidal coils connected in series with an operating current of 3770 A. During commissioning of the torus magnet, field mapping was carried out at different levels of operating current in order to determine the field profile and field error table. In order to meet the physics requirement of the field accuracy we need magnetic field strength measurements which are accurate at the 0.1% level, and we need to know radius and azimuth to 0.1 mm and z to 0.5 mm. The center line of the torus magnet is approximately 6 m from ground level and the overall height of the torus magnet is approximately 8.5 m. There is also limited space around the magnet and in between the coils. Field mapping had to be carried out along the Z axis (i.e. along the bore) and at 4 radial locations between each coil. These restrictions provided certain challenges for the magnetic field mapping task. The mapper prototype was built and tested prior to use on the Torus itself. In this presentation the field mapper design, prototyping and actual data collection procedure will be presented.

• Research Organization: Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1985996
• Report Number(s): JLAB-ACE-17-2486; DOE/OR/23177-6480
• Resource Relation: Conference: IMMW20, Oxford, UK, June 4, 2017
• Country of Publication: United States
• Language: English