Technology and structure of superconducting devices Superconducting devices

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Technology and structure of superconducting devices Superconducting devices used in systems that require large

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 3. Systems with large magnetic field gradient 3. 1.

1. Introduction 2. Current lead 3. Systems with large magnetic field gradient 3. 1. DECRIS 4. Systems with great homogeneity of magnetic field 4. 1 Systems with superconducting shielding

Introduction Superconductivity in nuclear physics: 1. Spectroscopy 2. Accelerating particles 3. Ion Source Heating

Introduction Superconductivity in nuclear physics: 1. Spectroscopy 2. Accelerating particles 3. Ion Source Heating and cooling

Current lead Historical view: 1. Copper – several W 2. HTS with silver matrix

Current lead Historical view: 1. Copper – several W 2. HTS with silver matrix 3. HTS with silver-gold alloy matrix – several m. W

HTS current lead

HTS current lead

Magnetic field distribution for two conductors (1. in superconducting state, but without current, 2.

Magnetic field distribution for two conductors (1. in superconducting state, but without current, 2. is with 100 A current) The maximum field from one superconducting tape is about 0, 02 T. Magnetic field distribution for two conductors, both with 100 A current. Bmax is about 0, 04 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%.

1, 2 –Copper leads 6 – Exchanger of heat on a 40 K level

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 DECRIS Ion source is one of the most important elements of accelerators,

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

ECR ion source

ECR ion source

K R I O N

K R I O N

D E C R I S

D E C R I S

DECRIS Magnetic field gradient up to 100 T/m It can work continuos for several

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

Because of necessity of keeping up magnetic field homogeneity, often superconducting key blockers

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

Superconducting shields Superconductors can be used to shield magnetic field. Shielding can be explained

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.

To increase magnetic field homogeneity opened magnetic shields are used. They are planed to

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.

Results of the research, is shown in the picture:

Results of the research, is shown in the picture:

Without magnetic shields With magnetic shields

Without magnetic shields With magnetic shields

Other devices, which uses superconducting elements: Resistance current limiter

Other devices, which uses superconducting elements: Resistance current limiter

SUPERGANTRI (planed)

SUPERGANTRI (planed)

In closed magnetic shields, area inside is completely shielded. This effect is used for

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: Dr Stanislav Z. Pakuliak (BLTP, JINR,

Thank you for your attention Special thanks 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)

Structure Structure Structure 1 2 End Structure StructureStructure Structure Structure 1 2 End Structure Structure
Readout and control of superconducting detectors Superconducting detectorsReadout and control of superconducting detectors Superconducting detectors
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