TY  - JOUR
AU  - Liptak, Z. et al
AU  - Marinas, C.
PY  - 2022
DA  - 2022//
TI  - Measurements of beam backgrounds in SuperKEKB Phase 2
T2  - Nucl. Instrum. Methods Phys. Res. A
JO  - Nuclear Instruments & Methods in Physics Research A
SP  - 167168
EP  - 19pp
VL  - 1040
AB  - The high design luminosity of the SuperKEKB electron–positron collider will result in challenging levels of beam-induced backgrounds in the interaction region. Understanding and mitigating these backgrounds is critical to the success of the Belle II experiment. We report on the first background measurements performed after roll-in of the Belle II detector, a period known as SuperKEKB Phase 2, utilizing both the BEAST II system of dedicated background detectors and the Belle II detector itself. We also report on first revisions to the background simulation made in response to our findings. Backgrounds measured include contributions from synchrotron radiation, beam-gas, Touschek, and injection backgrounds. At the end of Phase 2, single-beam backgrounds originating from the 4 GeV positron Low Energy Ring (LER) agree reasonably well with simulation, while backgrounds from the 7 GeV electron High Energy Ring (HER) are approximately one order of magnitude higher than simulation. We extrapolate these backgrounds forward and conclude it is safe to install the Belle II vertex detector.
UR  - https://arxiv.org/abs/2112.14537
UR  - https://doi.org/10.1016/j.nima.2022.167168
DO  - 10.1016/j.nima.2022.167168
N1  - exported from refbase (https://references.ific.uv.es/refbase/show.php?record=5496), last updated on Thu, 30 Mar 2023 11:30:57 +0000
ID  - Liptak+Marinas2022
ER  -