Future Perspectives of the Bonn Polarized Target Since the mid 1980‘s: Bonn is a place of excellence in the field of polarized solid targets ! Still valid.

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Presentation transcript:

Future Perspectives of the Bonn Polarized Target Since the mid 1980‘s: Bonn is a place of excellence in the field of polarized solid targets ! Still valid today, especially concerning the ‚hardware‘ !  Famous ‚GDH cryostat‘, now used for CB ELSA But: Development of the ‚software‘ = Polarizable target materials ! Needed: Reestablishment of the material research branch Chance : Collaboration between the Bonn Polarized Target group and the Radiation Safety Officer of the Physics Institut

The Material Figure of Merit ~ P 2 f 2 FS Relaxation Time Beam Intensity Radiation Resistance Thermal Conductance Economy Dilution Factor Maximum Polarization Preparation & Handling Availability large amounts Special Requirements Target Set-Up Experiment

by the target (cryostat) Loading temperature  Temp. stability of the unpaired electrons ‚Enhanced‘ base temperature  Particularly long FS relaxation times Internal polarization magnet  Reduced sensitivity on magn. field parameters by physics experiment Background nuclei  Polarized ?  Light nuclei needed ? Low energy reaction products  Target = Detector  Polarizable szintillator ‚Active Target‘ Special Requirements

Target material development & Possible Experiments A) The period of the ‚gold diggers‘, the phenomenological period: Radiation Hardness & Dilution Factor ~ 1960: First target material LMN proposed by Abragam/Jeffries / cm : 70% proton polarization, used in > 40 Exp. since 1968 ~ 3% 1966: Invention of the alcohols (butanol !) by S. Mango * 10 3  First pol. experiments with electromagnetic probes ~ 13% 1970‘s: Development of a ammonia (NH 3, ND 3 ) by Niinikoski/Meyer * 10 1  First pol. electron scattering exp. (SLAC/EMC) ~ 17% 1980: Proposal of the Lithium Hydrides ( 6 LiD/ 7 LiH) by A. Abragam * 10 1 ~ 50% 1990‘s: Development of a reproducible preparation method (Saclay, Bonn, Bochum), used in

Target Material Development & Possible Experiments (Bonn and Bochum 1990-today) B) The period of the ‚pea counters‘, the systematical period: DNP & Max. Polarization 1990‘s: Spin temperature theory and the DNP of LiD/LiH 2000 : Preparation of 1 liter 6 LiD for (± 55%) 2000+: Further systematical investigations Properties of the electron centers  Polarization behaviour  Understanding the magnetic field behaviour of d-butanol  Irradiated d-butanol: 5T  Trytil doped deuterated alcohols & diols: 2.5T

Necesseties for fruitfull material research activities 1. Experience  Intense collaboration with our Bochum colleagues 2. Equipment  Simple to operate polarization apparatus for material tests  currently under construction NMR system for polarization measurement  PhD position, advertized with positve resonance EPR system for studying the DNP active electron centers  Collaboration with the Sync. Rad. Group of ELSA 3. Man power  Lots of enthusiastic students !!!