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DIAMOND ACTIVITIES DESY Zeuthen

This project focuses on the development and prototyping of diamond sensors for use in high radiation environments, such as those found in calorimetry (TESLA beam) and beam diagnostics at DESY Zeuthen. With a small team of physicists, PhD students, and postdocs, we investigate the properties of diamond materials sourced from various manufacturers. We employ rigorous testing methods to analyze sensor performance under different conditions, aiming for improved understanding and future developments in sensor technology and readout methods. Collaboration with institutes like CERN and GSI is vital to our progress.

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DIAMOND ACTIVITIES DESY Zeuthen

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  1. DIAMOND ACTIVITIESDESY Zeuthen Wolfgang Lange

  2. MOTIVATION and PEOPLE: • Calorimetry in an environment with high radiation doses (TESLA beam cal) • Beam diagnostics (photoinjector test facility Zeuthen) • ------ • Currently 2 physicists (part of their time) 1 PhD student (2 soon?) 1 Postdoc (applications now checked) • Support from ‘applying’ groups like Photoinjector…

  3. How did we start? • Small group, few people: search for potential collaborators under the headline: Who does apply or produce diamonds? • DESY HH, GSI Darmstadt, IAP Freiburg • GPI Moscow, JINR Dubna • CERN / existing collaborations? • Diamond material from E6 • Decision: learning by doing…

  4. Our Program • Prototyping of sensors from different manufacturers: IAP, GPI, E6 • IAP: polycrystalline samples with different finishing and treatment • GPI: polycrystalline samples • 2 samples bought from E6 -->INVESTIGATION OF PROPERTIES

  5. MEASUREMENTS: DC measurements: we found ohmic behavior, hysteresis effects, nonohmic (nonlinear) effects, search for correlation with other sensor properties…

  6. HV Diamond Keithley 487 N2 MORE ON MEASUREMENTS: - Extremely low currents: -> dry N2 atmosphere and well isolating materials - settling times, relaxation

  7. ADC Sr90 PA delay diamond Scint. discr & PM1 Gate discr PM2 SIGNALS: Lab in Zeuthen -> more data required -> test run

  8. TEST BEAM (low rate) : MIP in a 5 GeV/c Test beam (T7)

  9. TEST BEAM (high intensity) : Sensor with positive bias 5 GeV/c test beam (T7) Sensor with negative bias 5 GeV/c test beam (T7)

  10. TEST BEAM (structured sensor) : Sensor (1 cm2) with structure: 4 (2*2) pads 5 GeV/c (T7) 2 pads parallel (yellow) 2 individual Scintillator for Calibration (green)

  11. PLANS AND FUTURE • Improved sensors (CCD), use of different analysis methods -> search for correlation with sensor properties • Better understanding of observed effects • Try to instrument larger areas (cal) • R&D of readout technologies • Prototyping of a calorimeter segment and of beam diagnostic sensors

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