Transverse mode-coupling instability and space charge
Abstract
Transverse mode-coupling instability (TMCI) is known to limit bunch intensity. Since space charge (SC) changes coherent spectra, it affects the TMCI threshold. Generally, there are only two types of TMCI with respect to SC: the vanishing type and the strong space charge (SSC) type. For the former, the threshold value of the wake tune shift is asymptotically proportional to the SC tune shift, as it was first observed twenty years ago by M. Blaskiewicz for exponential wakes. For the latter, the threshold value of the wake tune shift is asymptotically inversely proportional to the SC, as it was shown by one of the authors. In the presented studies of various wakes, potential wells, and bunch distributions, the second type of instability was always observed for cosine wakes; it was also seen for the sine wakes in the case of a bunch within a square potential well. The vanishing TMCI was observed for all other wakes and distributions we discuss in this paper: always for the negative wakes, and always, except the cosine wake, for parabolic potential wells. At the end of this paper, we consider high-frequency broadband wake, suggested as a model impedance for CERN SPS ring. As expected, TMCImore »
- Authors:
- Publication Date:
- Research Org.:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- OSTI Identifier:
- 1477559
- Alternate Identifier(s):
- OSTI ID: 1497100
- Report Number(s):
- arXiv:1711.11110; FERMILAB-PUB-17-693-APC-CD
Journal ID: ISSN 2469-9888; PRABCJ; 104201
- Grant/Contract Number:
- AC02-07CH11359
- Resource Type:
- Journal Article: Published Article
- Journal Name:
- Physical Review Accelerators and Beams
- Additional Journal Information:
- Journal Name: Physical Review Accelerators and Beams Journal Volume: 21 Journal Issue: 10; Journal ID: ISSN 2469-9888
- Publisher:
- American Physical Society
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 43 PARTICLE ACCELERATORS
Citation Formats
Zolkin, T., Burov, A., and Pandey, B. Transverse mode-coupling instability and space charge. United States: N. p., 2018.
Web. doi:10.1103/PhysRevAccelBeams.21.104201.
Zolkin, T., Burov, A., & Pandey, B. Transverse mode-coupling instability and space charge. United States. https://doi.org/10.1103/PhysRevAccelBeams.21.104201
Zolkin, T., Burov, A., and Pandey, B. 2018.
"Transverse mode-coupling instability and space charge". United States. https://doi.org/10.1103/PhysRevAccelBeams.21.104201.
@article{osti_1477559,
title = {Transverse mode-coupling instability and space charge},
author = {Zolkin, T. and Burov, A. and Pandey, B.},
abstractNote = {Transverse mode-coupling instability (TMCI) is known to limit bunch intensity. Since space charge (SC) changes coherent spectra, it affects the TMCI threshold. Generally, there are only two types of TMCI with respect to SC: the vanishing type and the strong space charge (SSC) type. For the former, the threshold value of the wake tune shift is asymptotically proportional to the SC tune shift, as it was first observed twenty years ago by M. Blaskiewicz for exponential wakes. For the latter, the threshold value of the wake tune shift is asymptotically inversely proportional to the SC, as it was shown by one of the authors. In the presented studies of various wakes, potential wells, and bunch distributions, the second type of instability was always observed for cosine wakes; it was also seen for the sine wakes in the case of a bunch within a square potential well. The vanishing TMCI was observed for all other wakes and distributions we discuss in this paper: always for the negative wakes, and always, except the cosine wake, for parabolic potential wells. At the end of this paper, we consider high-frequency broadband wake, suggested as a model impedance for CERN SPS ring. As expected, TMCI is of the vanishing type in this case. Furthermore, SPS Q26 instability, observed at strong SC almost with the same bunch parameters as it would be observed without SC, cannot be TMCI.},
doi = {10.1103/PhysRevAccelBeams.21.104201},
url = {https://www.osti.gov/biblio/1477559},
journal = {Physical Review Accelerators and Beams},
issn = {2469-9888},
number = 10,
volume = 21,
place = {United States},
year = {Thu Oct 11 00:00:00 EDT 2018},
month = {Thu Oct 11 00:00:00 EDT 2018}
}
Web of Science
Figures / Tables:
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Figures / Tables found in this record: