Colliding-beam source for polarized ions

Haeberli, W.; Barker, M.; Gossett, C. A.; Mavis, D. G.; Quin, P.A.; Sowiński, J.; Wise, T.; Glavish, H.F.

doi:10.1016/0029-554x(82)90094-5

Cited by 57 publications

(9 citation statements)

References 16 publications

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“…Proton and deuteron beams from the crossed-beam polarized ion source [9] were accelerated and momentum analyzed with a 90° bending magnet. The scattering measurements were carried out in a 1 m diameter scattering chamber which was filled with either hydrogen or deuterium gas at a pressure of 200 Torr.…”

mentioning

confidence: 99%

Determination of the phase shifts forp-delastic scattering atEp=3 MeV

1993

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Phase shift parameters for p-d elastic scattering are extracted from new measurements of spin observables at E v = 3 MeV. The experimental phase shifts are compared with predictions obtained from Faddeev calculations. The agreement between theory and experiment is generally good. However, we find that there are significant discrepancies for the 2 Si phase shift and for the S-D mixing parameters.PACS numbers: 25.10. +S, 24.70.+S, 25.40.Cm There is currently a great deal of interest in understanding the nuclear three-body system. Over the last several years a substantial amount of progress has been made in the development of the theoretical means for addressing the three-body problem (for example, techniques for solving the Faddeev equations). It is now well established (see, for example, Ref.[1]) that conventional two-body NN forces are not sufficiently strong to reproduce the observed 3 H and 3 He binding energies, and the role of three-body forces in resolving this discrepancy has been studied extensively [2][3][4].Experimental results for n-d and p-d elastic scattering also have the potential to provide new information concerning the nature of the fundamental interactions in complex nuclear systems. As the theoretical capabilities continue to advance we can anticipate that the scattering data will begin to take on added importance. It has been known for some time that measurements of the nucleon analyzing power, A y , for N-d scattering are very sensitive to the NN 3 Pj partial waves [5], and this sensitivity has recently been exploited in an effort to constrain the NN 3 Pj forces [6]. It has also been suggested [5][6][7] that comparison of n-d and p-d results may provide information concerning possible charge independence and/or charge symmetry violation, and one can expect that N-d measurements will ultimately play an important role in understanding the nature and role of nuclear three-body forces.Our purpose in the present Letter is to present new measurements of spin observables for p-d elastic scattering. The measurements will be compared with existing state-of-the-art Faddeev calculations [8]. These calculations provide a good qualitative description of the data, but at the quantitative level there are discrepancies. The nature of the differences between the measured and calculated polarization observables will be studied by comparing phase shifts extracted from the data with the calculated phase shifts. Comparison of theory and experiment at the level of the phase shifts is clearly of value, since it is often possible to relate individual splittings or mixing parameters with specific components of the NN force. However, comparisons of this kind have not been fruitful in the past since the measurements have not been of sufficient quality to allow reliable and accurate determination of the phase shift parameters.We have obtained new measurements of the polarization observables for p-d elastic scattering at E p = 3 MeV and at the corresponding deuteron energy, Ed = 6 MeV. The new data set consists of mea...

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confidence: 99%

Determination of the phase shifts forp-delastic scattering atEp=3 MeV

1993

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“…The performance of the jet source is thus not much better than that of a more conventional one manufactured by ANAC [45], the characteristics of which were reported by Haeberli et al [14] in the context of a colliding beam source for polarized ion production. The ANAC source also employs an rf dissociator and contains two large bore high field gradient hexapole magnets, one with a tapered bore and one with a fixed bore.…”

Section: Ar+almentioning

confidence: 73%

“…Employing a water-cooled rf (500 W, 20 MHz) dissociator and a pair of large bore hexapole electromagnets, Dunham et al [14] developed a polarized jet atomic beam for use as a gas target. While the density of the beam was found to be quite high, (2-6) x 1011particles/cm3, the polarization at low field, measured by a -p scattering, was observed to be, only 0.25-0.33.…”

Section: Ar+almentioning

confidence: 99%

“…Since the late 1960's a large fraction of this effort has been directed toward the production of polarized proton, deuteron, and H-beams for applications to nuclear and particle physics [17]. Recently, substantial attention has also been given to the development of extremely cold, intense neutral beams [14] for use as internal targets in high-energy storage rings, as polarized proton sources for accelerator injection, and as the central element in hydrogen masers for time and frequency standards. Many of the hydrogen beams described in the literature, whether polarized or un polarized, are large, complex, and costly devices that are not particularly suitable for smaIl scale laboratory physics.…”

Section: Introductionmentioning

confidence: 99%

“…Whether used as a probe of the weak interaction [1], as a testing ground for quantum electrodynamics [2], as a laboratory for metrology [3] and .the determination of the values of fundamental constants [4], or as a target for the study of basic atomic coIlisions [5][6][7][8], the hydrogen atom has continued to play a central role in our attempt to understand physical phenomena at their most basic level. As a consequence, much effort has been devoted to the development of atomic hydrogen beams, both ground state and excited state, both polarized and un polarized [9][10][11][12][13][14][15][16]. Since the late 1960's a large fraction of this effort has been directed toward the production of polarized proton, deuteron, and H-beams for applications to nuclear and particle physics [17].…”

Section: Introductionmentioning

confidence: 99%

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A polarized atomic hydrogen beam

Chan

Crowe

Lubell

et al. 1988

Z Phys D - Atoms, Molecules and Clusters

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We describe the design and operating characteristics of a simple polarized atomic hydrogen beam particularly suitable for applications to crossed beams experiments. In addition to experimental measurements, we present the results of detailed computer models, using Monte-Carlo ray tracing techniques, optical analogs, and phase-space methods, that not only provide us with a confirmation of our measurement, but also allow us to characterize the density, polarization, and atomic fraction of the beam at all points along its path. As a subsidiary result, we also present measurements of the relative and absolute efficiencies of the VjG Supavac mass analyzer for masses 1 and 2.

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A comparison of Faddeev calculations to high-precision d-p elastic-scattering analyzing-power measurements at Ed = 10MeV

Sowiński¹

The Three-Body Force in the Three-Nucleon System

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Colliding-beam source for polarized ions

Cited by 57 publications

References 16 publications

Determination of the phase shifts forp-delastic scattering atEp=3 MeV

Determination of the phase shifts forp-delastic scattering atEp=3 MeV

A polarized atomic hydrogen beam

A comparison of Faddeev calculations to high-precision d-p elastic-scattering analyzing-power measurements at Ed = 10MeV

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