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Timing Studies and Data Analysis of GEMs in High Energy Physics at CERN's CMS Experiment

This report details the timing studies conducted on GEMs (Gas Electron Multipliers) as part of the RD51 collaboration at CERN. The tests were performed with various electric fields from June to August 2010. Data analysis revealed that the VFAT chip introduces a jitter in the detector signal that is critical for time resolution. To achieve maximum efficiency in measurements, synchronization between the VFAT chip clock and LHC triggers is essential. The findings aim to enhance the performance of GEM detectors in high-energy particle physics.

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Timing Studies and Data Analysis of GEMs in High Energy Physics at CERN's CMS Experiment

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  1. Timing StudiesS. ColafranceschiCERN CMS (CMX-DS)L.N.F. Frascati, Universita’ Degli studi di Roma “la Sapienza” Electronics meeting

  2. Test Beam setup @ RD51 H4 Prevessin Tracker GEMs Timing GEM 1 TB: from 28 June to 8 July 2010 II TB: from 14 August to 20 August 2010

  3. Data Analysis: Timing Studies (SBIT) Ed=2KV/cm Et1= Et2 =3.0 KV/cm Ei=3KV/cm Et1= Et2 =3.0 KV/cm

  4. VFAT CHIP: clock issue… VFAT output digital signals are synchronous to VFAT clock (40Mhz, 25ns), therefore the chip is introducing a jitter to the detector signal. This is especially critical when MSPL=1. Considering MSPL=1 (25ns) a gaussian time resolution with rms=5ns will work at fully efficiency, the convoluted distribution no! 25ns

  5. Simulating LHC conditions In order to remove the VFAT jitter the clock of the chip and LHC should be synchronized to achieve fully efficiency.

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