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Start Over Author "O. Felden" Journal physical review letters
6 results on '"O. Felden"'

1. Excitation Functions of the Analyzing Power inpp→Scattering from 0.45 to 2.5 GeV

Author

M. Altmeier, F. Bauer, J. Bisplinghoff, M. Busch, K. Büßer, T. Colberg, L. Demirörs, O. Diehl, H. P. Engelhardt, P. D. Eversheim, O. Felden, R. Gebel, M. Glende, J. Greiff, F. Hinterberger, E. Jonas, H. Krause, T. Lindemann, J. Lindlein, R. Maier, R. Maschuw, A. Meinerzhagen, D. Prasuhn, H. Rohdjeß, D. Rosendaal, P. von Rossen, N. Schirm, V. Schwarz, W. Scobel, H. J. Trelle, E. Weise, A. Wellinghausen, and R. Ziegler

Subjects
Physics, Elastic scattering, Proton, Scattering, Phase (waves), Physics::Accelerator Physics, General Physics and Astronomy, Atomic physics, Nuclear Experiment, Spin (physics), Excitation, Storage ring, Beam (structure)
Abstract

Excitation functions A(N)(p(p),Theta(c.m.)) of the analyzing power in pp--> elastic scattering have been measured with a polarized atomic hydrogen target for projectile momenta p(p) between 1000 and 3300 MeV/ c. The experiment was performed for scattering angles 30 degrees

Published
2000
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2. Measurement of spin-correlation parameters ANN, ASS, and ASL at 2.1 GeV in proton-proton elastic scattering

Author

F, Bauer, J, Bisplinghoff, K, Büsser, M, Busch, T, Colberg, L, Demirörs, C, Dahl, P D, Eversheim, O, Eyser, O, Felden, R, Gebel, J, Greiff, F, Hinterberger, E, Jonas, H, Krause, C, Lehmann, J, Lindlein, R, Maier, A, Meinerzhagen, C, Pauly, D, Prasuhn, H, Rohdjess, D, Rosendaal, P, von Rossen, N, Schirm, W, Scobel, K, Ulbrich, E, Weise, T, Wolf, and R, Ziegler

Abstract

At the Cooler Synchrotron COSY/Jülich spin-correlation parameters in elastic proton-proton (pp) scattering have been measured with a 2.11 GeV polarized proton beam and a polarized hydrogen atomic beam target. We report results for A(NN), A(SS), and A(SL) for c.m. scattering angles between 30 degrees and 90 degrees. Our data on A(SS)--the first measurement of this observable above 800 MeV--clearly disagrees with predictions of available pp scattering phase-shift solutions while A(NN) and A(SL) are reproduced reasonably well. We show that in the direct reconstruction of the scattering amplitudes from the body of available pp elastic scattering data at 2.1 GeV the number of possible solutions is considerably reduced.

Published
2002

3. How to Reach a Thousand-Second in-Plane Polarization Lifetime with 0.97-GeV/c Deuterons in a Storage Ring.

Author

Guidoboni G, Stephenson E, Andrianov S, Augustyniak W, Bagdasarian Z, Bai M, Baylac M, Bernreuther W, Bertelli S, Berz M, Böker J, Böhme C, Bsaisou J, Chekmenev S, Chiladze D, Ciullo G, Contalbrigo M, de Conto JM, Dymov S, Engels R, Esser FM, Eversmann D, Felden O, Gaisser M, Gebel R, Glückler H, Goldenbaum F, Grigoryev K, Grzonka D, Hahnraths T, Heberling D, Hejny V, Hempelmann N, Hetzel J, Hinder F, Hipple R, Hölscher D, Ivanov A, Kacharava A, Kamerdzhiev V, Kamys B, Keshelashvili I, Khoukaz A, Koop I, Krause HJ, Krewald S, Kulikov A, Lehrach A, Lenisa P, Lomidze N, Lorentz B, Maanen P, Macharashvili G, Magiera A, Maier R, Makino K, Mariański B, Mchedlishvili D, Meißner UG, Mey S, Morse W, Müller F, Nass A, Natour G, Nikolaev N, Nioradze M, Nowakowski K, Orlov Y, Pesce A, Prasuhn D, Pretz J, Rathmann F, Ritman J, Rosenthal M, Rudy Z, Saleev A, Sefzick T, Semertzidis Y, Senichev Y, Shmakova V, Silenko A, Simon M, Slim J, Soltner H, Stahl A, Stassen R, Statera M, Stockhorst H, Straatmann H, Ströher H, Tabidze M, Talman R, Thörngren Engblom P, Trinkel F, Trzciński A, Uzikov Y, Valdau Y, Valetov E, Vassiliev A, Weidemann C, Wilkin C, Wrońska A, Wüstner P, Zakrzewska M, Zuprański P, and Zyuzin D

Abstract

We observe a deuteron beam polarization lifetime near 1000 s in the horizontal plane of a magnetic storage ring (COSY). This long spin coherence time is maintained through a combination of beam bunching, electron cooling, sextupole field corrections, and the suppression of collective effects through beam current limits. This record lifetime is required for a storage ring search for an intrinsic electric dipole moment on the deuteron at a statistical sensitivity level approaching 10^{-29}  e cm.

Published
2016
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4. New Method for a Continuous Determination of the Spin Tune in Storage Rings and Implications for Precision Experiments.

Author

Eversmann D, Hejny V, Hinder F, Kacharava A, Pretz J, Rathmann F, Rosenthal M, Trinkel F, Andrianov S, Augustyniak W, Bagdasarian Z, Bai M, Bernreuther W, Bertelli S, Berz M, Bsaisou J, Chekmenev S, Chiladze D, Ciullo G, Contalbrigo M, de Vries J, Dymov S, Engels R, Esser FM, Felden O, Gaisser M, Gebel R, Glückler H, Goldenbaum F, Grigoryev K, Grzonka D, Guidoboni G, Hanhart C, Heberling D, Hempelmann N, Hetzel J, Hipple R, Hölscher D, Ivanov A, Kamerdzhiev V, Kamys B, Keshelashvili I, Khoukaz A, Koop I, Krause HJ, Krewald S, Kulikov A, Lehrach A, Lenisa P, Lomidze N, Lorentz B, Maanen P, Macharashvili G, Magiera A, Maier R, Makino K, Mariański B, Mchedlishvili D, Meißner UG, Mey S, Nass A, Natour G, Nikolaev N, Nioradze M, Nogga A, Nowakowski K, Pesce A, Prasuhn D, Ritman J, Rudy Z, Saleev A, Semertzidis Y, Senichev Y, Shmakova V, Silenko A, Slim J, Soltner H, Stahl A, Stassen R, Statera M, Stephenson E, Stockhorst H, Straatmann H, Ströher H, Tabidze M, Talman R, Thörngren Engblom P, Trzciński A, Uzikov Y, Valdau Y, Valetov E, Vassiliev A, Weidemann C, Wilkin C, Wirzba A, Wrońska A, Wüstner P, Zakrzewska M, Zuprański P, and Zyuzin D

Abstract

A new method to determine the spin tune is described and tested. In an ideal planar magnetic ring, the spin tune-defined as the number of spin precessions per turn-is given by ν(s)=γG (γ is the Lorentz factor, G the gyromagnetic anomaly). At 970  MeV/c, the deuteron spins coherently precess at a frequency of ≈120  kHz in the Cooler Synchrotron COSY. The spin tune is deduced from the up-down asymmetry of deuteron-carbon scattering. In a time interval of 2.6 s, the spin tune was determined with a precision of the order 10^{-8}, and to 1×10^{-10} for a continuous 100 s accelerator cycle. This renders the presented method a new precision tool for accelerator physics; controlling the spin motion of particles to high precision is mandatory, in particular, for the measurement of electric dipole moments of charged particles in a storage ring.

Published
2015
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5. Measurement of spin-correlation parameters ANN, ASS, and ASL at 2.1 GeV in proton-proton elastic scattering.

Author

Bauer F, Bisplinghoff J, Büsser K, Busch M, Colberg T, Demirörs L, Dahl C, Eversheim PD, Eyser O, Felden O, Gebel R, Greiff J, Hinterberger F, Jonas E, Krause H, Lehmann C, Lindlein J, Maier R, Meinerzhagen A, Pauly C, Prasuhn D, Rohdjess H, Rosendaal D, von Rossen P, Schirm N, Scobel W, Ulbrich K, Weise E, Wolf T, and Ziegler R

Abstract

At the Cooler Synchrotron COSY/Jülich spin-correlation parameters in elastic proton-proton (pp) scattering have been measured with a 2.11 GeV polarized proton beam and a polarized hydrogen atomic beam target. We report results for A(NN), A(SS), and A(SL) for c.m. scattering angles between 30 degrees and 90 degrees. Our data on A(SS)--the first measurement of this observable above 800 MeV--clearly disagrees with predictions of available pp scattering phase-shift solutions while A(NN) and A(SL) are reproduced reasonably well. We show that in the direct reconstruction of the scattering amplitudes from the body of available pp elastic scattering data at 2.1 GeV the number of possible solutions is considerably reduced.

Published
2003
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6. Excitation functions of the analyzing power in pp--> scattering from 0.45 to 2.5 GeV

Author

Altmeier M, Bauer F, Bisplinghoff J, Busch M, Busser K, Colberg T, Demirors L, Diehl O, Engelhardt HP, Eversheim PD, Felden O, Gebel R, Glende M, Greiff J, Hinterberger F, Jonas E, Krause H, Lindemann T, Lindlein J, Maier R, Maschuw R, Meinerzhagen A, Prasuhn D, Rohdjess H, Rosendaal D, and von Rossen P

Abstract

Excitation functions A(N)(p(p),Theta(c.m.)) of the analyzing power in pp--> elastic scattering have been measured with a polarized atomic hydrogen target for projectile momenta p(p) between 1000 and 3300 MeV/ c. The experiment was performed for scattering angles 30 degrees

Published
2000
Full Text
View/download PDF

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