Abstract

The CMS collaboration aims at improving the muon trigger and tracking performance at the HL-LHC by installing new Gas Electron Multiplier (GEM) chambers in the endcaps of the CMS experiment. Construction and commissioning of GEM chambers for the first muon endcap stations is ramping up in several laboratories using common quality control protocols. The SCRIBE framework is a scalable and cross-platform web-based application for the RD51 Scalable Readout System (SRS) that controls data acquisition and analyzes data in near real time. It has been developed mainly to simplify and standardize measurements of the GEM chamber response uniformities with x-rays across all production sites. SCRIBE works with zero suppression of raw SRS pulse height data. This has increased acquisition rates to 5 kHz for a CMS GEM chamber with 3072 strips and allows strip-by-strip response comparisons with a few hours of data taking. SCRIBE also manages parallel data reconstruction to provide near real-time feedback on the chamber response to the user. Preliminary results on the response performance of the first mass-produced CMS GEM chambers commissioned with SCRIBE are presented.

Highlights

  • During 2016, the CMS [1] Gas Electron Multiplier (GEM) group has started to work towards the standardization of GEM chamber [2] construction across the assembly sites

  • The chamber response test is the last quality control test expected to be performed at assembly sites before shipping the chamber to CERN

  • The Front End Concentrators (FECs), a modular building block of the Scalable Readout System (SRS) electronics, can work in parallel to scale up the readout system

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Summary

THE FRAMEWORK OBJECTIVES

These three functionalities can be performed at the same time and from different devices. SCRIBE runs in a web server that accepts connections from any device through a web browser. In this way multiple users can perform multiple actions, i.e. as start new runs, analyze data or perform a read/write operation for any register of the electronics

INTRODUCTION
SCRIBE ARCHITECTURE
The electronics configuration
The data acquisition system
The data reconstruction
THE FRAMEWORK FUNCTIONALITIES
SUMMARY AND CONCLUSIONS
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