International agreement for beamline corrector magnets

Back in October 2016, nus2surf reported that the Institute of High Energy Physics (IHEP) in Beijing had agreed to build a prototype corrector magnet designed by Fermilab for the LBNF beamline. The IHEP team has now verified the design, and successfully constructed and tested the prototype.

In addition over the last several months, the U.S. Department of Energy and IHEP prepared a formal agreement in which IHEP would construct 24 of these corrector magnets for LBNF over a thee-year period. This agreement, a formal cooperative research and development agreement (CRADA) between the two parties, has been finalized, and was signed in March. It is considered as part of the IHEP in-kind contribution to LBNF and represents the first international CRADA, or I-CRADA, for LBNF.

“This is an important milestone for us,” said Vaia Papadimitriou, the LBNF Beamline project manager. “We are collaborating with IHEP in other areas, but this is a big new endeavor.”

Some of the other areas of collaboration in the past few years include Finite Element Analysis on the decay pipe beam windows, MARS simulations and R&D for a hadron monitor detector.

Among the benefits cited in the I-CRADA, IHEP and Fermilab will share in the technical advancements that these magnets make possible. They are large-aperture, air-cooled, relatively high-field, have a large region of good field, and are sufficiently flexible to be used for particle accelerators at both laboratories. Further, the exchange of scientific and technical information between the two labs will strengthen their relationship.

The IHEP team has achieved satisfactory results in testing the prototype, running both thermal tests and magnetic field tests with a Hall probe. The team still plans to repeat the magnetic field tests with a rotating coil probe.  Once that has been completed, they will ship the prototype magnet to Fermilab in the May timeframe.

At Fermilab the onsite team will repeat the tests. After Fermilab accepts the prototype, IHEP will prepare for mass production of the 24 corrector magnets.