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Reduction of coherent betatron oscillations in a muong-2 storage ring experiment using RF fields

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Title
Reduction of coherent betatron oscillations in a muong-2 storage ring experiment using RF fields
Author(s)
On Kim; Bhattacharya, M; SeungPyo Chang; Jihoon Choi; Crnkovic, JD; Ganguly, S; SelcukHacı¨omero˘glu; Kargiantoulakis, M; Young-ImKim; Soohyung Lee; Morse, WM; Nguyen, H; Orlov, YF; Roberts, BL; Yannis K Semertzidis; Tishchenko, V; Tran, NH; Yucel, EB
Subject
beam dynamics,muon g − 2, coherent betatron oscillations, radio frequency
Publication Date
2020-06
Journal
NEW JOURNAL OF PHYSICS, v.22, no.6, pp.063002
Publisher
IOP PUBLISHING LTD
Abstract
© 2020 The Author(s). This work demonstrates that two systematic errors, coherent betatron oscillations (CBO) and muon losses, can be reduced through application of radio frequency (RF) electric fields, which ultimately increases the sensitivity of the muong- 2 experiments. As the ensemble of polarized muons goes around a weak focusing storage ring, their spin precesses, and when they decay through the weak interaction, mu(+)-> e(+)nu(e)(nu) over bar (mu), the decay positrons are detected by electromagnetic calorimeters. In addition to the expected exponential decay in the positron time spectrum, the weak decay asymmetry causes a modulation in the number of positrons in a selected energy range at the difference frequency between the spin and cyclotron frequencies,omega(a). This frequency is directly proportional to the magnetic anomalya(mu)= (g- 2)/2, wheregis theg-factor of the muon, which is slightly greater than 2. The detector acceptance depends on the radial position of the muon decay, so the CBO of the muon bunch following injection into the storage ring modulate the measured muon signal with the frequency omega(CBO). In addition, the muon populations at the edge of the beam hit the walls of the vacuum chamber before decaying, which also affects the signal. Thus, reduction of CBO and unwanted muon loss increases the a(mu) measurement sensitivity. Numerical and experimental studies with RF electric fields yield more than a magnitude reduction of the CBO, with muon losses comparable to the conventional method.
URI
https://pr.ibs.re.kr/handle/8788114/7805
DOI
10.1088/1367-2630/ab83d0
ISSN
1367-2630
Appears in Collections:
Center for Axion and Precision Physics Research(액시온 및 극한상호작용 연구단) > 1. Journal Papers (저널논문)
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