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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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Presentation Transcript
slide1

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

slide2

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

introduction
Introduction

Superconductivityin nuclear physics:

  • Spectroscopy
  • Accelerating particles
  • Ion Source

Heating and cooling

current lead
Current lead

Historical view:

  • Copper – several W
  • HTS with silver matrix
  • HTS with silver-gold alloymatrix – several mW
slide7

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%.

slide8

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

ion sources
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
decris
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
slide15

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.

superconducting shields
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.

slide20

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.

slide22

With magnetic shields

Without magnetic shields

slide25

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

thank you for your attention special thanks to
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)