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Instrumentation of the very Forward Region

Instrumentation of the very Forward Region. Wolfgang Lohmann. DESY (Zeuthen). Colorado, Cracow, DESY(Zeuthen), JINR Dubna, London (UC), Minsk (BSU), Prague, Protvino ( IHEP), Tel Aviv Collaboration. The very Forward Calorimeter Collaboration. The TESLA Detector.

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Instrumentation of the very Forward Region

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  1. Instrumentation of the very Forward Region Wolfgang Lohmann DESY (Zeuthen) Colorado, Cracow, DESY(Zeuthen), JINR Dubna, London (UC), Minsk (BSU), Prague, Protvino ( IHEP), Tel Aviv Collaboration amsterdam

  2. The very Forward Calorimeter Collaboration

  3. The TESLA Detector

  4. Functions of the very Forward Detektors • Detection of Electrons and Photons at very low angle • Measurement of the Luminosity • Shielding of the inner Detector • Fast Beam Diagnostics 220 cm TDR DESIGN

  5. Measurement of the Luminosity Gauge Process: e+e- e+e- Goal: 10-4 Precision (LEP: 3.4 10-4) • Physics case: GZ for Giga-Z Two Fermion cross section at high energy, threshold scans • Technology: Si-W Sandwich Calorimeter • First Simulations Optimisation of shape and Segmantation • Theorists are working (T. Riemann, Z. Was ….)

  6. Fast Beam Diagnostics e+ e- • e+e- pairs from beamstrahlung are deflected into the LCAL • 15000 e+e- per BX 10 – 20 TeV • 10 MGy per year Rad. hard sensors • Technologies: Diamond-W Sandwich Scintillator crystals Gas ionisation chamber Deposited energy over R and f contains information about beam parameters

  7. Detection of Electrons and Photons at very low angle • Tag of two photon events

  8. Detection of Electrons and Photons at very low angle • essential parameters: Small Molière radius High granularity Longitudinal segmentation • Two photon event rejection e+e- e+e- m+m- (Severe background for particle searches) 500 BX • Electromagnetic fakes 1% from physics 2% from fluctuations

  9. Schematic views W-Diamond sandwich Heavy crystals sensor Space for electronics

  10. Proposal for a 2-year R&D program LAT (low angle) LCAL (very low angle) • Simulations for different technologies • Simulations (shape and segmentation) • Design (mechanics, alignment) • Comparison of technologies Choose the most promising(s) • Physics studies • Sensor prototyping and lab. tests • Sensor prototyping

  11. The first steps ………. New design of the forward region (e.g. l = 4m)

  12. The first steps ………. Diamond sensor prototype measurement (JINR and DESY)

  13. Diamond sensor prototype measurement (JINR and DESY) Mip response using a Si sensor First spectra using Diamond Sr90 source noise First new sensor samples from Fraunhofer Institut Freiburg and Prokhorov Institut Moscow are expected mid april

  14. Shielding of the inner Detector

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