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Performance of a hydrogen/deuterium polarized gas target in a storage ring
- Source :
- Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment, 474(3), 209-223. Elsevier, van Buuren, L D, Szczerba, D, van den Brand, J F J, Bulten, H J, Klous, S, Mul, F A, Poolman, H R & Simani, M C 2001, ' Performance of a hydrogen/deuterium polarized gas target in a storage ring ', Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, vol. 474, no. 3, pp. 209-223 . https://doi.org/10.1016/S0168-9002(01)00885-3, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 474(3), 209-223. Elsevier
- Publication Year :
- 2001
-
Abstract
- The performance of a high-density polarized hydrogen/deuterium gas target internal to a medium-energy electron storage ring is presented. Compared to our previous electron scattering experiments with tensor-polarized deuterium at NIKHEF (Zhou et al., Nucl. Instr. and Meth. A 378 (1996) 40; Ferro-Luzzi et al., Phys. Rev. Lett. 77 (1996) 2630; Van den Brand et al., Phys. Rev. Lett. 78 (1997) 1235; Bouwhuis et al., Phys. Rev. Lett. 82 (1999) 687; Zhou et al., Phys. Rev. Lett. 82 (1999) 687) the target figure of merit, ( polarization ) 2 × luminosity , was improved by more than an order of magnitude. The target density was increased by upgrading the flux of nuclear-polarized atoms injected into the storage cell and by using a longer (60 cm ) and colder (∼70 K ) storage cell. A maximal target thickness of 1.2 (1.1)±0.1×10 14 nuclei / cm 2 was achieved with deuterium (hydrogen). With typical beam currents of 110 mA , this corresponds to a luminosity of about 8.4 (7.8)±0.8×10 31 e − nuclei cm −2 s −1 . By reducing the molecular background and using a stronger target guide field, a higher polarization was achieved. The target was used in combination with a 720 MeV polarized electron beam stored in the AmPS ring (NIKHEF) to measure spin observables in electron–proton and electron–deuteron scattering. Scattered electrons were detected in a large acceptance magnetic spectrometer. Ejected hadrons were detected in a single time-of-flight scintillator array. The product of beam and target vector polarization, P e P t , was determined from the known spin-correlation parameters of e ′ p quasi-elastic (or elastic) scattering. With the deuterium (hydrogen) target, values up to P e P t =0.49±0.03 (0.32±0.03) were obtained with an electron beam polarization of P e =0.62±0.04 (0.56±0.03) as measured with a Compton backscattering polarimeter (Passchier et al., Nucl. Instr. and Meth. A 414 (1998) 4988). From this, we deduce a cell-averaged target polarization of P t =0.78±0.07 (0.58±0.07), including the dilution by unpolarized molecules.
- Subjects :
- TENSOR ANALYZING POWERS
Nuclear and High Energy Physics
polarized internal target
Hydrogen
chemistry.chemical_element
Electron
SPECTROMETER
Physics::Atomic Physics
Nuclear Experiment
Instrumentation
deuterium
Physics
FORM-FACTOR
Scattering
atomic beam source
Polarization (waves)
Deuterium
chemistry
electron scattering
hydrogen
Cathode ray
NEUTRON
Atomic physics
ELASTIC ELECTRON-SCATTERING
Electron scattering
Storage ring
Subjects
Details
- Language :
- English
- ISSN :
- 01689002
- Database :
- OpenAIRE
- Journal :
- Nuclear Instruments & Methods in Physics Research Section A-Accelerators Spectrometers Detectors and Associated Equipment, 474(3), 209-223. Elsevier, van Buuren, L D, Szczerba, D, van den Brand, J F J, Bulten, H J, Klous, S, Mul, F A, Poolman, H R & Simani, M C 2001, ' Performance of a hydrogen/deuterium polarized gas target in a storage ring ', Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, vol. 474, no. 3, pp. 209-223 . https://doi.org/10.1016/S0168-9002(01)00885-3, Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors, and Associated Equipment, 474(3), 209-223. Elsevier
- Accession number :
- edsair.doi.dedup.....0ce869e8c6e4a441841c511c900e19de