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Michał Wiśniewski Adam Mickiewicz University in Poznań , Poland

Technology and structure of superconducting devices. Superconducting devices used in systems that require large magnetic field gradient and great homogeneity of magnetic field. Michał Wiśniewski Adam Mickiewicz University in Poznań , Poland. 1. Introduction 2. Current lead

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Michał Wiśniewski Adam Mickiewicz University in Poznań , Poland

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  1. Technology and structure of superconducting devices Superconducting devices used in systems that require large magnetic field gradient and great homogeneity of magnetic field MichałWiśniewski Adam Mickiewicz University in Poznań, Poland

  2. 1. Introduction 2. Current lead 3. Systems withlarge magnetic field gradient 3.1.DECRIS 4. Systems withgreat homogeneity of magnetic field 4.1 Systems with superconducting shielding

  3. Introduction Superconductivityin nuclear physics: • Spectroscopy • Accelerating particles • Ion Source Heating and cooling

  4. Current lead Historical view: • Copper – several W • HTS with silver matrix • HTS with silver-gold alloymatrix – several mW

  5. HTS current lead

  6. Magnetic field distribution for two conductors, both with 100A current. Bmax is about 0,04 T. Magnetic field distribution for two conductors (1. in superconducting state, but without current, 2. is with 100A current) The maximum field from one superconducting tape is about 0,02 T. Taking into account the magnetic field value generated by those superconducting tapes, One can see, that Ic.max value is decreasing about 30-40%.

  7. 1,2 –Copper leads 6 – Exchanger of heat on a 40 K level 10 – Textile structural element, with HTS elements of current leads on it 7 – Exchanger of heat on a 4 K level

  8. Ion sources • DECRIS • Ion source is one of the most important elements of accelerators, for example nuclotron • One of the most often used ion sources is ECR type ion source

  9. ECR ion source

  10. KRION

  11. DECRIS

  12. DECRIS • Magnetic field gradient up to 100 T/m • It can work continuos for several years • Using crycooler cooling causes bigger automation andit is decreasing the cost of upkeep

  13. Because of necessityof keeping up magnetic field homogeneity, often superconducting key blockers are used. They are closing the electric circuit after supplymagnets. It freezes a magnetic flux generated by electromagnet. Umożliwiają odłączenie układu zasilania przy zachowaniu strumienia magnetycznego.

  14. Superconducting shields Superconductors can be used to shield magnetic field. Shielding can be explained by pushing up the magnetic field outside the superconductor- Meisner effect.

  15. To increase magnetic field homogeneity opened magnetic shields are used. They are planed to be used at the electron cooling system of ion beam at the NICA project.

  16. Results of the research, is shownin the picture:

  17. With magnetic shields Without magnetic shields

  18. Other devices, which uses superconducting elements: • Resistance current limiter

  19. SUPERGANTRI (planed)

  20. In closed magnetic shields, area inside is completely shielded. This effect is used for example in superconducting current limiters.

  21. Thankyou for yourattentionSpecialthanks to: • Dr Stanislav Z. Pakuliak (BLTP, JINR, Dubna) • Dr Władysław Chmielowski (JINR, Dubna) • Dr hab. Roman Zawodny (UAM, Poznań) • Dr Henryk Malinowski (VBLHE, JINR, Dubna)

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