A Dynamically Polarized Deuteron Target PDF Download
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Author | : John Owen Poole |
Publisher | : |
Total Pages | : 133 |
Release | : 2007 |
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ISBN | : |
Download A Dynamically Polarized Deuteron Target Book in PDF, ePub and Kindle
Keywords: NMR polarimetry, dynamic nuclear polarization, fit to NMR spectra, dynamically polarized deuteron target.
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Release | : 2004 |
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Download A Dynamically Polarized Deuteron Target Book in PDF, ePub and Kindle
A dynamically polarized deuteron target was constructed at the Triangle Universities Nuclear Laboratory for low energy polarized neutron transmission experiments. Theoretical calculations suggested a measurement of the longitudinal spin-dependent total $vec[n]-vec[d]$ cross section difference, $Deltasigma_L$, would provide evidence of three nucleon force effects. The target was operated at a temperature of 0.5K with a recirculating $ˆ3$He evaporation refrigerator and a 2.5T split-pole superconducting magnet which can be mechanically mounted to produce either a longitudinally or tangentially polarized target relative to the beam momentum. The target material consisted of a cube of volume 2.7 ml of either partially (D6) or fully (D8) deuterated 1,2-propanediol chemically doped with EHBA-Cr$ˆV$ to provide the paramagnetic centers for dynamic nuclear polarization with microwaves in the region 69GHz. Polarization was monitored during the experiment using a continuous wave NMR Q-meter capable of both phase sensitive and magnitude detection. A PC running LabVIEW controlled data acquisition, frequency sweep of the digital frequency synthesizer and a novel background cancellation technique. A pre-recorded background signal was subtracted on a channel by channel basis before the NMR spectrum was sampled. Polarization was extracted from the NMR spectra by a fit to a theoretical lineshape. Effects including dispersion were considered. The equal spin temperature (EST) hypothesis was used to determine deuteron polarization indirectly though the measurement of polarization of the residual protons in the partially deuterated sample. Efforts to improve the system stability and signal-to-noise are discussed along with numerical methods, fitting strategy and evaluation of uncertainties.
Author | : Jim R. Boyce |
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Total Pages | : |
Release | : 1999 |
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Download A Dynamically Polarized Hydrogen and Deuterium Target at Jefferson Lab Book in PDF, ePub and Kindle
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Total Pages | : |
Release | : 1998 |
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Download A Dynamically Polarized Hydrogen and Deuterium Target at Jefferson Lab Book in PDF, ePub and Kindle
Polarized electron beams have been successfully used at Jefferson Lab for over a year. The authors now report the successful achievement of polarized targets for nuclear and particle physics experiments using the dynamic nuclear polarization (DNP)technique. The technique involves initial irradiation of frozen ammonia crystals (NH3 and ND3) using the electron beam from the new Free Electron Laser (FEL) facility at Jefferson Lab, and transferring the crystals to a special target holder for use in Experimental Halls. By subjecting the still ionized and frozen ammonia crystals to a strong magnetic field and suitably tuned RF, the high electron polarization is transmitted to the nucleus thus achieving target polarization. Details of the irradiation facility, the target holder, irradiation times, ionized crystal shelf life, and achieved polarization are discussed.
Author | : Jack Tuck Sanderson |
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Total Pages | : |
Release | : 1967 |
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Download A Dynamically Polarized Proton Target Book in PDF, ePub and Kindle
Author | : Vladimir (Laddie) Derenchuk |
Publisher | : World Scientific |
Total Pages | : 397 |
Release | : 2002-05-16 |
Genre | : Science |
ISBN | : 9814488801 |
Download Polarized Sources And Targets, Proceedings Of The Ninth International Workshop Book in PDF, ePub and Kindle
This book is an up-to-date survey of the science and technology of creating polarized beams and polarized targets. The papers in this collection describe state-of-the-art sources of polarized electrons, ions, atoms, neutrons, and radioactive isotopes, discuss new polarized solid and gas target techniques, present recent advances in polarimetry, and review the use of polarized gas in medical imaging.
Author | : G. R. Smith |
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Total Pages | : 8 |
Release | : 1986 |
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Download Direct Measurement of the Tensor Polarization of a Polarized Deuteron Target Book in PDF, ePub and Kindle
Author | : |
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Total Pages | : 7 |
Release | : 2014 |
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Download Dynamically Polarized Target for the G[sup]p[/sup][sub]2[/sub] and G[sup]p[/sup][sub]E[/sub] Experiments at Jefferson Lab Book in PDF, ePub and Kindle
We describe a dynamically polarized target that has been utilized for two electron scattering experiments in Hall A at Jefferson Lab. The primary components of the target are a new, high cooling power 4 He evaporation refrigerator, and a re-purposed, superconducting split-coil magnet. It has been used to polarize protons in irradiated NH3 at a temperature of 1 K and at fields of 2.5 and 5.0 Tesla. The performance of the target material in the electron beam under these conditions will be discussed. Maximum polarizations of 28% and 95% were obtained at those fields, respectively. To satisfy the requirements of both experiments, the magnet had to be routinely rotated between angles of 0, 6, and 90 degrees with respect to the incident electron beam. This was accomplished using a new rotating vacuum seal which permits rotations to be performed in only a few minutes.
Author | : Vladimir P. Derenchuk |
Publisher | : World Scientific |
Total Pages | : 404 |
Release | : 2002 |
Genre | : Science |
ISBN | : 9789810249175 |
Download Proceedings of the Ninth International Workshop Polarized Sources and Targets Book in PDF, ePub and Kindle
This book is an up-to-date survey of the science and technology of creating polarized beams and polarized targets. The papers in this collection describe state-of-the-art sources of polarized electrons, ions, atoms, neutrons, and radioactive isotopes, discuss new polarized solid and gas target techniques, present recent advances in polarimetry, and review the use of polarized gas in medical imaging.
Author | : Tapio O. Niinikoski |
Publisher | : Cambridge University Press |
Total Pages | : 535 |
Release | : 2020-01-16 |
Genre | : Medical |
ISBN | : 1108475078 |
Download The Physics of Polarized Targets Book in PDF, ePub and Kindle
Explains what spin is and how spins are polarized to study elementary particles, nuclei, atoms and molecular structures.