TAMU Magnet Program

Click for results of TAMU3 testing

         The primary goal of the magnet program at the Accelerator Research Lab at Texas A&M is to attain the highest magnetic field strength possible. ARL is fabricating a series of magnets that successively test individual technologies of a complete, novel design strategy to reach this goal. The technology of the TAMU magnet program includes the following features:


Block coil geometry: Simplified magnet part construction and winding in comparison to the accepted “Cosθ” designs. Block Geometry also decreases AC-losses during magnet ramping.


Stress management: A precision-machined, high-strength support structure to enable the use of brittle, next-gen superconductors Nb3Sn and Bi-2212. Accelerator dipole stress management is exclusive to the TAMU series.


Inconel laminar springs: Soft modulus element to mechanically separate concentric windings to minimize the effect of accumulated stress and resulting current degradation of conductor.


Stainless-steel bladder preload: Enables complete surface conformity and uniform preload for unyielding loading of magnet support structure.


Internal flux plate: Suppresses low-field multi-poles by forcing a dipole boundary condition within the magnet bore.


Fine filament AGY S-Glass insulation directly braided by A&P Technologies: Roughly half the thickness with increased mechanical strength and excellent dielectric properties.


Laminar stress transducers: New fabrication fixturing and procedure increased repeatability and precision. The new transducers give us an edge over other magnet labs for measuring Lorentz stress.

 

         TAMU1: a NbTi model of a six-coil block. Used to test our block winding geometry and impregnation system. This magnet was one of the first NbTi magnets to be impregnated and reach short sample. TAMU1 was also one of the first to show that intimate contact with liquid helium is not mandatory for stability.


         TAMU2: an Nb­3Sn single-racetrack mirror magnet. This magnet used low-loss ITER conductor and verified our heat treatment furnace. TAMU2 tested Stress Management at low magnetic field strength. TAMU2 reached 95% of strand short sample (99% cable short sample) with the first quench (zero training).Also, the block geometry coupled with ITER conductor enabled TAMU2 to be the world’s fastest ramping Nb3Sn dipole at over 4000 Amps per second.


    


         TAMU3: a Nb3Sn double-pancake currently being constructed designed at 14.6 Tesla peak. It will be the first test of stress management at high magnetic fields strength. TAMU3 incorporates novel techniques for accurate measurement of winding position prior to impregnation and accurate measurement of Lorentz force with stress transducers for stress management verification. 


A Brief Report of the current status of TAMU3.





         TAMU4: A split version of TAMU3 with additional test winding of Bi-2212. Construction of this magnet is postponed until further conductor development for Bi-2212.



         TAMU5: A flared-end Nb3Sn dipole with 3cm bore. This field-quality short prototype incorporates all the technology described above and would mature the stress management design strategy.

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