On Compensation of an Existing Linac for H- Intrabeam Stripping and Residual Beam Loss

Start2017/10/24(Tue) 1:30 PM
End2017/10/24(Tue) 3:30 PM
VenueMeeting Room at 4th floor of J-PARC Research Building
SpeakerRobert Jameson (Goethe Univ.)
ContactYong Liu (PHS 4735)


Intrabeam striping of the H- beam causing beam loss in the SNS and J-Parc linacs was discovered after they were built and brought into operation. A rough compensation, via reducing quad strengths below design resulting in larger beam size, was found. However, problems with the lowered focusing strength remain, because residual losses apparently from other sources remain that are of concern for future beam power upgrades. Detailed analysis has not yet been performed, which could help optimize a compensation scheme. Here are offered some observations, analysis, discussion and conclusions, that formulate a framework for such study, which is hoped may be of use.