Beam test of a baseline vertex detector prototype for CEPC
IEEE Transactions on Nuclear Science(2024)
摘要
The Circular Electron Positron Collider (CEPC) has been proposed to enable
more thorough and precise measurements of the properties of Higgs, W, and Z
bosons, as well as to search for new physics. In response to the stringent
performance requirements of the vertex detector for the CEPC, a baseline vertex
detector prototype was tested and characterized for the first time using a 6
GeV electron beam at DESY II Test Beam Line 21. The baseline vertex detector
prototype is designed with a cylindrical barrel structure that contains six
double-sided detector modules (ladders). Each side of the ladder includes
TaichuPix-3 sensors based on Monolithic Active Pixel Sensor (MAPS) technology,
a flexible printed circuit, and a carbon fiber support structure. Additionally,
the readout electronics and the Data Acquisition system were also examined
during this beam test. The performance of the prototype was evaluated using an
electron beam that passed through six ladders in a perpendicular direction. The
offline data analysis indicates a spatial resolution of about 5 um, with
detection efficiency exceeding 99
5.1 um. These promising results from this baseline vertex detector prototype
mark a significant step toward realizing the optimal vertex detector for the
CEPC.
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关键词
MAPS,Vertex detector,CEPC
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