WE-KJC
Large Racetrack Helmholtz Coil System
3 kGauss Pulsed Magnet System for Fusion & High-Energy Physics Applications
The Woodruff Engineering 4m Helmholtz Coil System is a production-validated, high-current pulsed magnet assembly engineered for laser fusion and high-energy physics applications requiring precise axial magnetic field control across extended working volumes. Generating 3 kGauss (0.3 Tesla) across a 2 meter × 0.3 meter uniformity zone, the system comprises two water-cooled racetrack-shaped coils (3 m × 0.5 m × 0.6 m each) separated by 0.55 meters to achieve the Helmholtz geometry condition for optimal field uniformity along the extended axial dimension. Having successfully completed both Factory Acceptance Testing (FAT) and Site Acceptance Testing (SAT), the system transitioned to active production use where it provides reliable high-field generation for experimental campaigns requiring sustained pulsed magnetic fields with precisely controlled temporal profiles and spatial uniformity.
Technical Specifications
0.3 Tesla
Field Strength
0.6 square meters
Uniformity Zone
4 meters
Coil Length
16 kA
Max Input Current
Our large racetrack Helmholtz coil system is designed for the demanding requirements of fusion energy research and high-energy physics applications. We understand the needs of our growing industry – paired with our supercapacitor PSU, our system delivers controlled high-field output in stable flat-top pulses. View our comprehensive spec sheet below or send us a message to discuss your project with our engineers.
Key Features
Extended Axial Uniformity via Racetrack Geometry
These coils produce a 2 meter axial field uniformity, enabling laser fusion experiments where plasma confinement, beam propagation, or diagnostic access require extended uniform-field regions along the target chamber axis.
Production-Validated (FAT/SAT Complete)
The system is in active production use. Completion of factory and site acceptance tests proves that these magnets are ready for use in your project, negating the risk associated with cutting-edge technology.
Safe Liquid Cooling
Each layer of these magnets is built with integrated cooling, providing stability under demanding operating schedules. Cooling channel terminations are electrically insulated to prevent power from escaping the system.
Why Choose Woodruff’s large racetrack coils?
CUSTOM-BUILT • We’ll work with you to build a set of coils to fit your project’s demands.
FIELD-PROVEN • These coils are being actively used in fusion research, meaning you’re getting a product that’s tried and tested, not just a prototype.
SAFE DESIGN • Constructed with rigorous engineering and fabrication standards to ensure stability during operation. The electrically insulated liquid cooling system keeps your team safe.
LARGE WORKING VOLUME • Racetrack geometry provides a large area of field uniformity, outclassing traditional round coils.
Target Applications
ITER-Class Central Solenoid and Major Facilities
ITER central solenoid, DEMO program tokamaks, and fusion pilot plant startup systems.
Tokamak Poloidal Field and Research Facilities
Designed for DIII-D-class poloidal field coils, pulsed superconducting magnet facilities, and fusion plasma control systems.
Research Laboratory Applications
University research magnets, diagnostic systems, and benchtop pulsed field facilities. Compact energy storage (9-144 MJ) enables building-integrated installations without dedicated power substations.