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Crystal Ball Meeting 7th -9th April, Dubrovnik

Johannes Gutenberg-Universität Mainz. Institut für Kernphysik. Status of the Mainz Frozen Spin Target. Crystal Ball Meeting 7th -9th April, Dubrovnik. Status of the Mainz Frozen Spin Target. Frozen Spin Target Polarization method Microwave system Target material Polarizing magnet

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Crystal Ball Meeting 7th -9th April, Dubrovnik

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  1. Johannes Gutenberg-Universität Mainz Institut für Kernphysik Status of the Mainz Frozen Spin Target Crystal Ball Meeting 7th -9th April, Dubrovnik

  2. Status of the Mainz Frozen Spin Target • Frozen Spin Target • Polarization method • Microwave system • Target material • Polarizing magnet • Cryostat temperatures • Cryostat internal holding coil • Conclusions & Outlook

  3. Microwave System CH3 CH3 CH3 N CH3 O Cryostat NMR Control System The Mainz Frozen Spin Target Magnet Target Butanol + Doping Pumping System

  4. Crystal Ball Polarizing magnet Polarizing magnet Cryostat Microwaves Microwaves Rail system needed Polarization method • External magnet 2.5 T • Polarize with microwaves • Internal holding coil 0.7 T • Remove external magnet • Move CB detector in. • Data taking. • Repolarization

  5. Target Polarization GDH July 2003 June 2003

  6. Polarizing Magnet The Mainz Frozen Spin Target Microwaves Target material

  7. Microwave setup Source Frequency sensor Frequency counter Power Sensors Computer control Power meter Target material Power supply

  8. Target material

  9. Polarizing magnet He4(liq)

  10. Start

  11. Stop

  12. Mainz-Dubna Cryostat • Target insert along the beam axis • Fits in the geometry of the • Crystal Ball detector: Horizontal • Superconducting holding coil • integrated • Temperatures of • 30 mK • He3-He4 mixture. • Dilution Cryostat • He3 line • Separator (3K) and Evaporator (1.2K) precooling stages. • Evaporator cryostat • He4 line. Mauricio Martínez FabregateDubrovnik, April 7th 2008

  13. 30 mK !

  14. ·  Current leads (46A): Copper (6mm2) T=300K  70 K HTc Supracond. T= 70K  4 K NbTi 200mm T= 4K  1.5K Internal Holding coil 1.3Kelvin 1 Tesla at 46A L=136mm, d=48mm, 4 layers Support Copper-tube d=0.3mm

  15. Coil production in the Mechanics workshop

  16. Conclusions & Outlook • Microwave system ready • Target material in Mainz • Polarizing magnet ready • Cryostat temperature 30 mK • Cryostat internal holding coil working • Rail system for CB (Next months) • Polarize and measure target of material (Spring) • Move target into the A2 hall (Summer) • First polarized data (Winter) • Diplom-student with transverse polarized coil

  17. Target Group Andreas Thomas Mauricio Martínez Garik Palagasvilik Oleksandr Kostivov Sasha Neganov Nicolai Borinov Yuri Usov + Rudolf Kondradiev Milorad Korolija Henry Ortega Patricia Aguar + Bonn & Bochum + Joachim, Mohamed, Vicenta, Noelia, Dave, Steven, Chris…

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