The DMAPS Upgrade of the Belle II Vertex Detector

G. Rizzo,D. Auguste， M. Winter, D. Xu

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SPECTROMETERS DETECTORS AND ASSOCIATED EQUIPMENT（2025）

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Abstract

The SuperKEKB collider will undergo a major upgrade at the end of the decade to reach the target luminosity of 6x1035 cm-2s-1, offering the opportunity to install a new fully pixelated vertex detector (VTX) for the Belle II experiment, based on depleted-MAPS sensors. The VTX will be more granular and robust against the expected higher level of machine background and more performant in terms of standalone track finding efficiency. The VTX baseline design includes five depleted-MAPS sensor layers, spanning radii from 14 mm to 140 mm, with a material budget ranging from 0.2% to 0.8% X/X0 per layer. All layers will be equipped with the same OBELIX sensor, designed in the TowerJazz 180 nm technology, with the pixel matrix derived from the TJ-Monopix2 sensor originally developed for the ATLAS experiment. The paper will describe the proposed VTX structure and review all project aspects: tests of the TJ-Monopix2 sensor, OBELIX-1 design status, ladder prototype fabrication and tests.

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Key words

Belle II,Vertex detector,VTX,Upgrade,CMOS Pixel Sensor,DMAPS,Particle tracking detectors

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【要点】：本文介绍了 Belle II 实验中顶点探测器（VTX）的升级，采用基于耗尽型-MAPS传感器的新设计，以提高在更高亮度条件下的性能和追踪效率。

【方法】：作者提出了一个包含五个耗尽型-MAPS传感器层的新VTX设计，每个层的材料预算在0.2%至0.8% X/X0之间，并采用 TowerJazz 180 nm 技术设计的OBELIX传感器。

【实验】：文章回顾了 TJ-Monopix2 传感器的测试、OBELIX-1 设计的现状、梯子原型制造和测试，但未具体提及使用的数据集名称和实验结果。