1. August 2005Snowmass Workshop IP Instrumentation Wolfgang Lohmann, DESY Measurement of: Luminosity (precise and fast) Energy Polarisation

2. Precise Luminosity Measurement IP VTX FTD 300 cm BeamCal L* = 4m Accuracy (from Physics) O(<10 -3 ) Gauge process: Bhabha Scattering Device: LumiCal 26 <  < 82 mrad Beampipe

3. Inner Radius of Cal.: < 4 μm Distance between Cals.: < 100 μm Radial beam position: < 0.6 mm Requirements on Alignment and mechanical Precision (MC simulations, BHLUMI) LumiCal IP Requirements on the Mechanical Design < 4 μm  < 0.6 mm

4. Beam Tilt Beam Size No effect

5.  Constant value value of the constant 0.11e-3 rad 0.13e-3 rad  30 layers 15 rings 20 rings 10 rings  4 layers 15 layers 11 layers 10 rings Performance Simulations for e + e - e + e - (  ) Event selection: acceptance, energy balance, azimuthal and angular symmetry. Simulation: Bhwide(Bhabha)+CIRCE(Beamstrahlung)+beamspread More in the talks by Halina Abramowicz

6. 20 mrad crossing angle Beamstrahlung pair background using serpentine field 250 GeV Number of Bhabha events as a function of the inner Radius of LumiCal Background from beamstrahlung A design for 20 mrad crossing angle will be done (needs time)

7. Decouple sensor frame from absorber frame Sensor carriers Absorber carriers Concept for the Mechanical Frame

8. Fast Lumi Measurement and Beam Diagnostics Use Electrons from Rad. Bhabha events

9. Trajectories of off momentum electrons in the first dublett Energy and spatial distributions Fast Lumi Measurement and Beam Diagnostics Needs a spectrometer there

10. Fast Lumi Measurement and Beam Diagnostics

11. 15000 e + e - per BX 10 – 20 TeV (10 MGy per year) e + e - Pairs from Beamstrahlung are deflected into the BeamCal GeV direct Photons for  < 200  rad Zero (or 2 mrad) crossing angle 20 mrad Crossing angle Beam Parameter Determination with BeamCal

12. total energy first radial moment thrust value angular spread L/R, U/D F/B asymmetries Observables Quantity Nominal Value Precision xx 553 nm1.2 nm yy 5.0 nm0.1 nm zz 300  m4.3  m yy 00.4 nm Beam Parameter Determination with BeamCal zero or 2 mrad Crossing angle √s = 500 GeV

13. Quantity Nominal Value Precision xx 553 nm4.8nm yy 5.0 nm0.1 nm zz 300  m11.5  m yy 02.0nm Beam Parameter Determination with BeamCal PRELIMINARY! 20 mrad crossing angle total energy first radial moment thrust value angular spread L/R, U/D F/B asymmetries Also simultaneous determination of several beam parameter is feasible, but: Correlations! Analysis in preparation Observables

14. Beam Parameter Determination with BeamCal

16. nominal setting (550 nm x 5 nm)  >100m IP L/R, U/D F/B asymmetries of energy in the angular tails Quantity Nominal Value Precision xx 553 nm4.2 nm zz 300  m7.5  m yy 00.2 nm Heavy gas ionisation Calorimeter and with PhotoCal Photons from Beamstrahlung

17. Heavy crystals W-Diamond sandwich sensor Space for electronics Technologies for the BeamCal: Radiation Hard Fast Compact

18. Detection of High Energy Electrons and Photons (Detector Hermeticity) √s = 500 GeV Single Electrons of 50, 100 and 250 GeV, detection efficiency as a function of R ( ‘ high background region ’ ) (talk by V. Drugakov and P. Bambade) Detection efficiency as a function of the pad-size (Talk by A. Elagin) Message: Electrons can be detected! Red – high BG blue – low BG

19. Includes seismic motions, Delay of Beam Feedback System, Lumi Optimisation etc. (G. White) Efficiency to identify energetic electrons and photons (E > 200 GeV) Fake rate √s = 500 GeV Realistic beam simulation Detection of High Energy Electrons and Photons

20. Sensor prototyping, Diamonds  ADC Diamond (+ PA) Scint.+PMT& signal gate May,August/2004 test beams CERN PS Hadron beam – 3,5 GeV 2 operation modes: Slow extraction ~10 5- 10 6 / s fast extraction ~10 5 -10 7 / ~10ns (Wide range intensities) Diamond samples (CVD): - Freiburg - GPI (Moscow) - Element6 Pm1&2 Pads

21. Linearity Studies with High Intensities (PS fast beam extraction) 10 5 particles/10 ns Response to mip Diamond Sensor Performance

22. Upstream momentum spectrometer

23. ESA Test Beam Plans for 2005/2006 2x10 10 electrons per bunch @ 28.5 GeV (ILC buch charge and length) Compare different measurments (this spectrometer, A- line BPMs, Synchrotron spectrometer) Accuracy goal: < 100 ppm Proof of principle!

24. Energy Measurement Downstream SR spectrometer Energy spectrum After bunch crossing Goals: peak position, width, tail

25. Downstream SR spectrometer

27. Upstream polarimeter Polarimetry Document on polarimetry design in Feb 2006 + Downstream polarimeter

28. The needs from Detector and Machine side are different. Lets find solutions