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Precise momentum determination of the external COSY proton beam near 1930 |
Author
Betigeri MG. Bojowald J. Budzanowski A. Chatterjee A. Drochner M. Ernst J. Fortsch S. Freindl L. Frekers D. Garske W. Grewer K. Hamacher A. Hawash M. Igel S. Ilieva I. Jahn R. Jarczyk L. Kemmerling
. Kilian K. Kliczewski S. Klimala W. Kolev D. Kutsarova T. Lieb BJ. Lippert G. Machner H. Magiera A. Maier R. Nann H. Plendl HS. Protic D. Razen B. von Rossen P. Roy B. Siudak R. Smyrski J. Strzalko
ski A. Tsenov R. Zolnierczuk PA. Zwoll K.
Institution
GEM Collaboration, Forschungszentrum Julich, Germany.
Title
Precise momentum determination of the external COSY proton beam near 1930
MeV/c.
Source
Nuclear Instruments & Methods in Physics Research Section A-Accelerators
Spectrometers Detectors & Associated Equipment, vol.426, no.2-3, 1 May 1999,
pp.249-53. Publisher: Elsevier, Netherlands.
Abstract
We present a method to determine precisely the absolute momentum of the external proton beam from the Julich Cooler Synchrotron COSY near 1930 MeV/c. In the pp to d pi /sup +/ reaction at 1930.477 M
V/c incident beam momentum, the forward going pions ( theta /sub c.m./=0 degrees ) and the backward going deuterons ( theta /sub c.m./=180 degrees ) have the same laboratory momentum. Such coinciden
pion-deuteron events are detected in the focal plane of the magnetic spectrometer BIG KARL located at theta /sub lab/=0 degrees . Using the nearly linear dependence of the difference between the me
sured pion and deuteron momenta as a function of the proton beam momentum, the absolute momentum of the external proton beam from COSY near 1930 MeV/c was determined with a precision of 5.2*10/sup -
/. (6 References).
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Timo Kellmann
automatically created: July 2001
