Abstract
KLOE-2 at the DAΦNE Φ-factory is the main experiment of the INFN Laboratori Nazionali di Frascati (LNF) and is the first high-energy experiment using the GEM technology with a cylindrical geometry, a novel idea developed at LNF. Four concentric cylindrical triple-GEM detectors compose the Inner Tracker, inserted around the interaction region and before the inner wall of the pre-existing KLOE Drift Chamber to improve the resolution on decay vertices close to the interaction point. State-of-the-art solutions have been expressly developed or tuned for this project: single-mask GEM etching, multi-layer XV patterned readout, PEEK spacer grid, GASTONE front-end board, a custom 64-channel ASIC with digital output, and the Global Interface Board for data collection, with a configurable FPGA architecture and Gigabit Ethernet. Alignment and calibration of a cylindrical GEM detector was never done before and represents one of the challenging activities of the experiment. The Inner Tracker detector construction, operation, calibration and performance obtained with cosmic-ray muons and Bhabha scattering events will be reported.
Highlights
The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati (LNF) is the continuation of the KLOE experiment[1], upgraded with state of the art technology to improve its discovery potential
KLOE-2 at the DAΦNE Φ-factory is the main experiment of the INFN Laboratori Nazionali di Frascati (LNF) and is the first high-energy experiment using the GEM technology with a cylindrical geometry, a novel idea developed at LNF
The previous KLOE setup consisting of a huge Drift Chamber (DC) [7] and an Electromagnetic Calorimeter (EMC) [8], both immersed in a 0.5 T axial magnetic field, underwent several upgrades: i) state-of-the-art cylindrical GEM detector, the Inner Tracker (IT), to improve vertex reconstruction capabilities near the interaction region, ii) LET [9] and HET [10, 11] e+e− taggers for γ − γ physics, iii) CCALT and QCALT detectors [12], crystal and tile calorimeters positioned near the interaction point and along the beam-pipe with the goal of improving multi-photon detection in rare decays and the acceptance for rejecting KL → 3π0 background events in CP-violating KL → 2π0 decays respectively
Summary
The KLOE-2 experiment at the INFN Laboratori Nazionali di Frascati (LNF) is the continuation of the KLOE experiment[1], upgraded with state of the art technology to improve its discovery potential. The previous KLOE setup consisting of a huge Drift Chamber (DC) [7] and an Electromagnetic Calorimeter (EMC) [8], both immersed in a 0.5 T axial magnetic field, underwent several upgrades: i) state-of-the-art cylindrical GEM detector, the Inner Tracker (IT), to improve vertex reconstruction capabilities near the interaction region, ii) LET [9] and HET [10, 11] e+e− taggers for γ − γ physics, iii) CCALT and QCALT detectors [12], crystal and tile calorimeters positioned near the interaction point and along the beam-pipe with the goal of improving multi-photon detection in rare decays and the acceptance for rejecting KL → 3π0 background events in CP-violating KL → 2π0 decays respectively. Alignment and calibration of a cylindrical GEM detector was never done before and represents one of the challenging activities of the experiment
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