1. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Crystal Ball Meeting 7th -9th April, Dubrovnik Status of the Mainz Frozen Spin Target Institut für Kernphysik Johannes Gutenberg-Universität Mainz

2. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 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. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Cryostat The Mainz Frozen Spin Target Target Microwave System Magnet Pumping System NMR N O CH 3 Butanol + Doping Control System

4. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Rail system needed Cryostat Polarizing magnet Crystal Ball Polarization method 1.External magnet 2.5 T 2.Polarize with microwaves 3.Internal holding coil 0.7 T 4.Remove external magnet 5.Move CB detector in. 6.Data taking. 7.Repolarization Polarizing magnet Microwaves

5. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Target Polarization GDH June 2003 July 2003

6. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 The Mainz Frozen Spin Target Polarizing Magnet Microwaves Target material

7. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Microwave setup Source Power Sensors Frequency sensor Power meter Frequency counter Target material Computer control Power supply

8. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Target material

9. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Polarizing magnet He4(liq)

10. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Start

11. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008

19. Stop

20. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Mainz-Dubna Cryostat Separator (3K) and Evaporator (1.2K) precooling stages. Evaporator cryostat He4 line. 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 Mauricio Martínez Fabregate Dubrovnik, April 7th 2008

21. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 30 mK !

22. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 · Current leads (46A):Copper (6mm 2 ) T=300K  70 K HTc Supracond. T= 70K  4 K NbTi 200  m 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

23. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Coil production in the Mechanics workshop

24. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008

27. 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

28. Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 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…