Abstract
SuperKEKB is a very high luminosity ${e}^{+}{e}^{\ensuremath{-}}$ collider consisting of a low energy ring (LER) of positrons of 4 GeV and a high energy ring (HER) of electrons of 7 GeV. The high luminosity will be achieved thanks to the nanobeam scheme, where very strongly focused beams (${\ensuremath{\sigma}}_{y}=60\text{ }\text{ }\mathrm{nm}$) will collide at a large crossing angle of 83 mrad. To maintain high luminosity operation, fast luminosity monitoring is essential in the presence of dynamic instabilities, for feedback and optimization. Fast luminosity monitors consisting of a single crystalline diamond sensor (LAL), a Cherenkov and scintillator detector (KEK) were placed in both rings downstream of the IP (interaction point) to measure the signal from the radiative Bhabha process at zero photon scattering angle ($\ensuremath{\sigma}\ensuremath{\approx}200\text{ }\text{ }\mathrm{mbarn}$). During single beam commissioning of SuperKEKB, the fast luminosity monitors were used as beam loss monitors to measure the single beam losses (beam-gas bremsstrahlung, Touschek scattering, Coulomb scattering). In this paper, a detailed description of the experimental setup, the data acquisition scheme, the data analysis and the comparison with the simulation for the diamond sensors, will be reported.
Highlights
SuperKEKB [1], the upgrade of KEKB, is an asymmetric eþe− collider aiming at searches for new physics beyond the Standard Model through precision measurements in the B meson sector
SuperKEKB is a very high luminosity eþe− collider consisting of a low energy ring (LER) of positrons of 4 GeV and a high energy ring (HER) of electrons of 7 GeV
After briefly reviewing the single crystal chemical vapor deposition diamond (sCVD) sensors used and the SuperKEKB commissioning process, we describe the main single beam loss mechanisms and assess the impact on our fast luminosity monitoring
Summary
SuperKEKB [1], the upgrade of KEKB, is an asymmetric eþe− collider aiming at searches for new physics beyond the Standard Model through precision measurements in the B meson sector. Several technologies have been developed and will be compared during machine operation, single crystal chemical vapor deposition diamond (sCVD) sensors, described in this paper, as well as Cherenkov and. The signals in our sensors should not be contaminated by background signals from single beam losses. Detailed simulations of single beam losses were performed in order to optimise the sensitivity of our devices to the Bhabha process [5]. After briefly reviewing the sCVD sensors used and the SuperKEKB commissioning process, we describe the main single beam loss mechanisms and assess the impact on our fast luminosity monitoring. I), which has the largest counting rates and will be the primary device for fast luminosity monitoring
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