Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Crystal Ball Meeting 7th -9th April, Dubrovnik
Status of theMainz Frozen Spin Target
Institut für KernphysikJohannes Gutenberg-Universität Mainz
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
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Cryostat
The Mainz Frozen Spin Target
Target
MicrowaveSystem
Magnet
Pumping SystemNMRL C
HHHH
HOCCCCH
HHHH
N
O
CH3
CH3CH3
CH3
Butanol+
Doping
ControlSystem
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Rail system needed
Cryostat
Polarizingmagnet
Crystal Ball
Polarization method
1. External magnet 2.5 T2. Polarize with microwaves3. Internal holding coil 0.7 T4. Remove external magnet5. Move CB detector in. 6. Data taking.7. Repolarization
Polarizingmagnet
MicrowavesMicrowaves
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Target Polarization GDH
June 2003 July 2003
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
The Mainz Frozen Spin Target
PolarizingMagnetMicrowaves
Targetmaterial
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Microwave setup
Source
Power Sensors
Frequency sensor
Power meter
Frequency counter
Targetmaterial
Computer control
Power supply
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Target material
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Polarizingmagnet
He4(liq)
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Start
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008 Stop
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mainz-Dubna Cryostat
•Separator (3K) and Evaporator (1.2K) precooling stages. Evaporator cryostatHe4 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
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Temp Mixing Chamber
0
50
100
150
200
250
300
350
400
450
500
12/12/20070:00
12/12/20074:48
12/12/20079:36
12/12/200714:24
12/12/200719:12
13/12/20070:00
Time
Tem
p (
mK
)
30 mK !
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
· Current leads (46A): Copper (6mm2) T=300K 70 KHTc Supracond. T= 70K 4 K
NbTi 200m T= 4K 1.5K
Internal
Holding coil1.3Kelvin
1 Tesla at 46A
L=136mm, d=48mm, 4 layers
Support Copper-tube d=0.3mm
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Coil production in theMechanics workshop
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
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
Mauricio Martínez Fabregate Dubrovnik, April 8th 2008
Target GroupAndreas Thomas
Mauricio Martínez Garik Palagasvilik Oleksandr Kostivov
Sasha NeganovNicolai Borinov
Yuri Usov+
Rudolf KondradievMilorad KorolijaHenry OrtegaPatricia Aguar
+Bonn & Bochum
+Joachim, Mohamed,
Vicenta, Noelia, Dave,Steven, Chris…
Top Related