@article{TEXTUAL,
      recid = {11636},
      author = {Zolkin, T. and Burov, A. and Pandey, B.},
      title = {Transverse mode-coupling instability and space charge},
      journal = {Physical Review Accelerators and Beams},
      address = {2018-10-11},
      number = {TEXTUAL},
      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, TMCI is of the vanishing type in this case. Thus,  SPS Q26 instability, observed at strong SC almost with the  same bunch parameters as it would be observed without SC,  cannot be TMCI.},
      url = {http://knowledge.uchicago.edu/record/11636},
}