Fabricage en test van een dipoolmagneet van de 6-tesla-klasse met hoge-temperatuursupergeleiding bij 4,2 K

Affiliaties:

  1. Applied Superconductivity Center, National High Magnetic Field Laboratory Florida State University, Tallahassee, Florida 32310, USA
  2. Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  3. Fermi National Accelerator Laboratory, Batavia, Illinois 60510, USA
  4. Advanced Conductor Technologies LLC, Boulder, Colorado 80301, USA
  5. University of Colorado, Boulder, Colorado 80309, USA

Publicatiegegevens:

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Samenvatting

Supergeleidende magneten maken versnellers aan de energiegrens mogelijk door sterke magnetische velden te genereren om deeltjes te sturen en te focussen. Hoewel hoge-temperatuursupergeleiders zoals $\text{REBa}2\text{Cu}3\text{O}x$ (REBCO, waarbij RE staat voor zeldzame aarde) een groot potentieel hebben voor het genereren van hogere magnetische velden dan Nb-Ti en $\text{Nb}3\text{Sn}$, bevindt de bijbehorende magneet- en geleidertechnologie voor versnellerapplicaties zich nog in de kinderschoenen.

Het Amerikaanse Magnet Development Program ontwikkelt REBCO-magneettechnologie in samenwerking met de industrie. In dit artikel rapporteren wij over een experiment waarbij een dipoolmagneet, genaamd C3, is vervaardigd met commerciële hoge-temperatuursupergeleidende CORC-draden. De magneet, gebaseerd op een gekanteld $\cos\theta$-ontwerp (canted $\cos\theta$), genereerde bij 4,2 K een dipoolveld van 5,99 T in een vrije opening van 65 mm bij een stroomsterkte van 6,795 kA, op het moment dat er een resistieve spanning van $105\ \mu\text{V}$ over een van de spoelen in de magneet verscheen.

De opgeslagen energie bedroeg 53 kJ bij het piekveld. De magneet vertoonde geen degradatie in het stroomdraagvermogen bij 4,2 K na de thermische cyclus. Wij rapporteren over het gedetailleerde ontwerp, de fabricage en de prestaties van de C3-magneet, wat van belang kan zijn voor potentiële gebruikers van deze opkomende technologie. Daarnaast bespreken wij kwesties en onderzoeksbehoeften om toekomstige REBCO-magneetontwikkeling te informeren. Dit experiment vormt een verdere stap in het bepalen of technologie voor versnellermagneten met hoge-temperatuursupergeleiding de ontdekkingsmogelijkheden van toekomstige deeltjesversnellers kan vergroten.

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