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6CCVD Research

Development of a high-rate capable DLC-RPC based on a current evacuation pattern

At a Glance

Section titled ā€œAt a Glanceā€
MetadataDetails
Publication Date2025-06-01
JournalJournal of Instrumentation
AuthorsMasato Takahashi, S. Ban, Weiyuan Li, A. Ochi, W. Ootani

Abstract

Section titled ā€œAbstractā€

Abstract A Resistive Plate Chamber using Diamond-Like Carbon electrodes (DLC-RPC) has been developed as a background tagging detector in the MEG II experiment. The DLC-RPC is planned to be installed in a high-intensity and low-momentum muon beam. This detector is required to have a detection efficiency above 90 % with four active gaps in the muon beam due to the limitation of the material budget. In such an environment, the high current flowing through the resistive electrodes causes a voltage drop, which reduces the performance of the DLC-RPC. This voltage drop can be suppressed by implementing a current evacuation pattern, though discharges are more likely to occur near the pattern. Therefore the pattern must be covered by a protection cover made of an insulator. In this study, electrode samples with a current evacuation pattern and different widths of protection cover (0.2 mm and 0.8 mm) have been produced, and their performance and stability were measured. The detection efficiency of a single-gap chamber for Ī² -rays from a 90 Sr source was measured to be up to approximately 60 % in both electrode samples. The target efficiency can be achieved even with a drop of 100-150 V. On the other hand, after more than a dozen hours of operation, discharges suddenly occurred and the detector was prevented from further operation. These discharges created current paths on the spacing pillars. This serious problem must be investigated and solved in the future.

Tech Support

Section titled ā€œTech Supportā€

Original Source

Section titled ā€œOriginal Sourceā€

References

Section titled ā€œReferencesā€
  1. 2024 - Prototype study of 0.1%X0 and MHz/cm2 tolerant Resistive Plate Chamber with Diamond-Like Carbon electrodes [Crossref]
  2. 2018 - The design of the MEG II experiment [Crossref]
  3. 2023 - Development of ultra-low mass and high-rate capable RPC based on Diamond-Like Carbon electrodes for MEGĀ II experiment [Crossref]
  4. 2004 - The DRS chip: Cheap waveform digitizing in the GHz range [Crossref]

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