Abstract
Regenerative multibunch beam breakup instabilities and countermeasures for a high-intensity electron accelerator and the superconducting Darmstadt linear electron accelerator
Highlights
Recirculating linac can be regarded as a hybrid of a conventional linac and a storage ring
Regenerative multibunch beam breakup instabilities are a well-known phenomenon in recirculating linacs where particle bunches pass multiple times through the same superconducting rf cavities with extremely high quality factor
At the same time the high beam quality is preserved as in linacs. It allows recovering the energy from the beam by passing it through the accelerating structure in decelerating phase before ejection. This technique is implemented in so called energy recovery linacs (ERLs) [1]
Summary
Recirculating linac can be regarded as a hybrid of a conventional linac and a storage ring. The concept of a recirculating linac brings advantages and a new type of instability, which was not possible in conventional linacs: regenerative multibunch beam breakup (BBU) instability It is caused by parasitic electromagnetic modes, that are excited in the. In the present work they will be referred to as modes because there are parasitic monopole modes; interaction with the fundamental mode can be neglected in BBU study (only energy variation along the beam path should be taken into account). It is the reason for another naming convention: recirculating linacs and ERLs are not distinguished here and both named recirculating machines. Examples in the present work are given for the first two facilities in this list
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