Speaker
Description
Sudden beam loss (SBL) is one of the major problems facing SuperKEKB, and various efforts have been made to solve it. SBL is a beam loss event in which a signifi-cant percentage of the beam current is lost in an instant. Beam loss begins within 10 microseconds, the equivalent of one revolution, and as a result, tens of percent of the total charge is lost in a few revolutions before the beam is aborted. In order to solve the problem, various moni-tors are being analyzed and new beam instrumentation devices are developed. Various circumstantial evidence suggests that removing the black stains caused by the vacuum sealant inside the vacuum chamber is likely to be effective in resolving the SBL. This paper explains, using various measurement results, how much SBL was reduced by cleaning the chamber as much as possible. We also report measurement results that may lead to the identification of the cause of SBL, though it has not been completely solved.
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