Generally, Energy Recovery Linac (ERL) needs special designed high current superconducting RF cavities. In this paper, the threshold current of BBU for compact ERL facilities with 9-cell Tesla type cavities are investigated. The results show that it is feasible to adopt 9-cell Tesla cavity for compact ERL test facilities with just a few cavities and beam current around tens mA.
@article{arxiv.1305.6119,
title = {Study on the multi-pass, multi-bunch beam breakup for 9-cell TESLA cavities in ERL},
author = {Si Chen and Sen-Lin Huang and Yong-Ming Li and Li-Wen Feng and Feng Zhu and Sheng-Wen Quan and Ke-Xin Liu and Jia-Er Chen},
journal= {arXiv preprint arXiv:1305.6119},
year = {2015}
}