Detailed studies of a high-density polarized hydrogen gas target for storage rings

Zapfe, K.; Brückner, W.; Gaul, H.G.; Grieser, M.; Lin, Minn-Tsong; Moroz, Z.; Povh, Bogdan; Rall, M.; Stechert, B.; Steffens, E.; Stenger, J.; Stock, F.; Tonhäuser, J.; Montag, C.; Rathmann, F.; Fick, D.; Braun, B.; Graw, G.; Haeberli, W.

doi:10.1016/0168-9002(95)00608-7

Cited by 24 publications

(6 citation statements)

References 13 publications

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“…1(a), which follows well the prediction based upon the Bonn wave function [10]. The effective target density was determined by measuring the frequency shift of the stored proton beam as it lost energy due to its repeated passages through the target [11,12]. Combining this with a measurement of the beam current, an integrated luminosity of (23±1.4) pb −1 was found over the 300 hours of data-taking.…”

supporting

confidence: 68%

Measurement of thepn→dK+K−total cross section close to threshold

et al. 2009

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Measurements of the pd → pspdK + K − reaction, where psp is a spectator proton, have been undertaken at the Cooler Synchrotron COSY-Jülich by detecting a fast deuteron in coincidence with a K + K − pair in the ANKE facility. Although the proton beam energy was fixed, the moving target neutron allowed values of the non-resonant quasi-free pn → dK + K − total cross section to be deduced up to an excess energy ǫ ≈ 100 MeV. Evidence is found for the effects of K − d and KK final state interactions. The comparison of these data with those of pp → ppKshows that all the total cross sections are very similar in magnitude. We have recently published measurements of the differential and total cross sections for the pp → ppK + K − reaction at three energies close to threshold [1]. A major challenge in the analysis was the separation of the contribution from the production and decay of the φ meson from that of the non-φ component [2]. One of the striking features of the non-φ results is the strong attraction between the K − and each of the final protons seen in the differential distributions. This also has a major effect on the energy dependence of the total cross section, enhancing it at low energies. Although tantalizing, these results do not, however, resolve the ongoing question as to whether the interaction is sufficiently strong to allow the K − to form a bound state with the two protons [3,4,5].The isospin dependence of φ production has been studied through an investigation of pd → p sp dK. By identifying the final deuteron and kaon pair and measuring their momenta, it was possible to construct the momentum of the recoil proton p sp to show that it was consistent with being a spectator, whose only significant participation in a reaction is through a change in the kinematics. Interpreting the results in this way, it was possible to extract values of the quasi-free pn → dK + K − cross section. Moreover, although the experiment was carried out at one fixed beam energy, the movement of the target neutron enabled data to be obtained over a wide range of excess energy ǫ = √ s − m d − 2m K on an event-by-event basis. Just as in the pp → ppK + K −

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confidence: 68%

Measurement of thepn→dK+K−total cross section close to threshold

et al. 2009

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“…was deduced from the shift of the orbit frequency of the coasting beam caused by the energy loss in the target gas (see section IV B) [8,58].…”

Section: A Polarized Atomic Beam Source and Storage Cellmentioning

confidence: 99%

“…where f ≈ 508 kHz denotes the revolution frequency. The total hadronic cross section σ 0 = 59.8 mb was extracted from the SAID database [87], and the Coulomb loss cross section (see (8)) was determined from the machine acceptance angle at the target, Θ acc = 6.45 ± 0.27 mrad (see table V), yielding σ C = 677.6 mb. The resulting beam lifetime from (37) yields τ cell = 48500 s with d t = 5.5 · 10 13 cm −2 (see (14)).…”

Section: B Contributions From Vacuum To Beam Lifetimementioning

confidence: 99%

“…In the framework of the FILTEX collaboration, polarization build-up in an initially unpolarized beam was observed for the first time using 23 MeV protons stored in the TSR 3 at Heidelberg, interacting with polarized hydrogen atoms in a storage-cell target [6]. (A detailed description of the experimental effort is given in [7][8][9], up-to-date results are summarized in [10]. )…”

Section: Introductionmentioning

confidence: 99%

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Toward polarized antiprotons: Machine development for spin-filtering experiments

Weidemann¹,

Rathmann²,

Stein³

et al. 2015

Phys. Rev. ST Accel. Beams

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The paper describes the commissioning of the experimental equipment and the machine studies required for the first spin-filtering experiment with protons at a beam kinetic energy of 49.3MeV in COSY. The implementation of a low-β insertion made it possible to achieve beam lifetimes of τb=8000s in the presence of a dense polarized hydrogen storage-cell target of areal density dt=(5.5±0.2)×1013atoms/cm2. The developed techniques can be directly applied to antiproton machines and allow for the determination of the spin-dependent p¯p cross sections via spin filtering

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“…was deduced from the shift of the orbit frequency of the coasting beam due to the energy loss in the target gas (see Sec. IV B) [8,57].…”

Section: A Polarized Atomic Beam Source and Storage Cellmentioning

confidence: 98%

Toward polarized antiprotons: machine development for spin-filtering experiments at COSY

Weidemann

2015

Phys. Scr.

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The paper describes the commissioning of the experimental equipment and the machine studies required for the first spin-filtering experiment with protons at a beam kinetic energy of 49.3 MeV in COSY. The implementation of a low-β insertion made it possible to achieve beam lifetimes of τ b = 8000 s in the presence of a dense polarized hydrogen storage cell target of areal density dt = (5.5 ± 0.2) × 10 13 atoms/cm 2. The developed techniques can be directly applied to antiproton machines and allow for the determination of the spin-dependentpp cross sections via spin filtering.

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Detailed studies of a high-density polarized hydrogen gas target for storage rings

Cited by 24 publications

References 13 publications

Measurement of thepn→dK+K−total cross section close to threshold

Measurement of thepn→dK+K−total cross section close to threshold

Toward polarized antiprotons: Machine development for spin-filtering experiments

Toward polarized antiprotons: machine development for spin-filtering experiments at COSY

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