Author
Leif A. Ahrens
Bio: Leif A. Ahrens is an academic researcher. The author has an hindex of 1, co-authored 1 publications receiving 2 citations.
Papers
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16 Jun 2008
TL;DR: The tune-up period preceding the polarized proton physics run during January of 1988 at the Brookhaven AGS is reviewed in this paper, with a focus on the tuning of the tuning phase.
Abstract: The tune−up period preceding the polarized proton physics run during January of 1988 at the Brookhaven AGS is reviewd.(AIP)
3 citations
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01 Jan 2000-Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment
TL;DR: In this article, a modified beam optics was found which significantly lowers the strength of these intrinsic resonances at the COSY synchrotron, which allowed internal experiments to take data in the whole acceleration ramp.
Abstract: Accelerating a polarized beam in a synchrotron requires the highest possible superperiodicity of the lattice in order to minimize the number of depolarizing intrinsic resonances. However, at the cooler synchrotron COSY the standard lattice to accelerate the beam to maximum momentum has a reduced superperiodicity since the harmful transition energy is shifted upwards during acceleration. This procedure allows internal experiments to take data in the whole acceleration ramp. Unfortunately the reduced superperiodicity excites additional intrinsic resonances. To solve this contrary situation a modified beam optics was found which significantly lowers the strength of these intrinsic resonances. Measurements confirming this theoretical concept are presented.
13 citations
19 Sep 2022
TL;DR: In this paper , the authors discuss how the polarization is preserved with real accelerators, including both electrons and protons, and present a few examples of spin manipulations, including a few spin collisions.
Abstract: Abstract In this chapter, we will discuss how the polarization is preserved with real accelerators, including both electrons and protons. In the end, we also present a few examples of spin manipulations.
04 Jun 2003
TL;DR: In this paper, the first decade of AGS polarization was reviewed, and some aspects of the machine situation, the depolarization avoidance strategies employed and the success achieved in AGS from the perspective of one of those involved.
Abstract: This workshop’s focus is on considering ways for improving the proton beam polarization that the AGS delivers to the RHIC. This talk attempts to review the first decade of AGS polarization — the 1980’s; to briefly describe some aspects of the machine situation, the depolarization avoidance strategies employed and the success achieved in AGS from the perspective of one of those involved.