The Joint Accelerator Conferences Website (JACoW) is an international collaboration that publishes the proceedings of accelerator conferences held around the world.
@InProceedings{calvey:ibic2020-thpp25,
author = {J.R. Calvey and M. Borland and T.K. Clute and J.C. Dooling and L. Emery and J. Gagliano and J.E. Hoyt and P.S. Kallakuri and L.H. Morrison and U. Wienands},
% author = {J.R. Calvey and M. Borland and T.K. Clute and J.C. Dooling and L. Emery and J. Gagliano and others},
% author = {J.R. Calvey and others},
title = {{Measurements of Ion Instability and Emittance Growth for the APS-Upgrade}},
booktitle = {Proc. IBIC'20},
pages = {258--262},
paper = {THPP25},
language = {english},
keywords = {emittance, detector, injection, photon, storage-ring},
venue = {Santos, Brazil},
series = {International Beam Instrumentation Conference},
number = {9},
publisher = {JACoW Publishing, Geneva, Switzerland},
month = {10},
year = {2020},
issn = {2673-5350},
isbn = {978-3-95450-222-6},
doi = {10.18429/JACoW-IBIC2020-THPP25},
url = {https://www.jacow.org/ibic2020/papers/thpp25.pdf},
note = {https://doi.org/10.18429/JACoW-IBIC2020-THPP25},
abstract = {Ions are produced in an accelerator when the beam ionizes residual gas inside the vacuum chamber. If the beam is negatively charged, ions can become trapped in the beam’s potential, and their density will increase over time. Trapped ions can cause a variety of undesirable effects, including instability and emittance growth. Because of the challenging emittance and stability requirements of the APS-Upgrade storage ring, ion trapping is a serious concern. To study this effect at the present APS, a gas injection system was installed. A controlled pressure bump of Nitrogen gas was created over a 6m straight section, and the resulting ion instability was studied using several different detectors. Measurements were taken using a pinhole camera, spectrum analyzer, bunch-by-bunch feedback system, and a gas bremsstrahlung detector. Studies were done under a wide variety of beam conditions, and at different pressure bump amplitudes. In this paper we report on the results of some of these measurements, and discuss the implications for present and future electron storage rings.},
}