1. FCAL Takashi Maruyama SLAC SiD Workshop, 15 – 17 November, 2010, Eugene, Oregon

2. Introduction Precision luminosity measurement Calorimeter hermeticity LumiCal BeamCal LumiCal Provide instantaneous luminosity using beamstrahlung pairs Online beam parameter monitor  veto for particle searches Calorimeter hermeticity BeamCal 2

3. LumiCal Luminosity precision goal  L / L<10 -3 – 10 6 W + W - events in 5 years (500 fb -1 )  L/L=(N rec -N gen )/N gen – Bhabha d  /d  ~ 1/  3 –  L/L~2  /  min,  is a systematic error.  must be less than ~20  rad to reach  L/L = 10 -3. – Detector radial location must be know within 30  m. – Detector Z location within 1.5 mm. MDI Push-Pull issue 3 Centered on the extraction line

4. Luminosity precision  L / L vs. radial segmentation SiD LumiCal simulation OPAL Luminometer: 14 lyrs of 3.5mm + 4 lyrs of 7.0mm OPAL achieved  L/L = 3.4  10 -4  L / L < 10 -3 can be reached by  r < 3mm. 4

5. LumiCal Electrical/Mechanical Design FCAL Collaboration No detailed electrical/mechanical design will be made for the DBD. Will follow FCAL collaboration development. 5 Green: Si sensors Purple: W radiators

6. Beamstrahlung pairs at BeamCal No DID Anti-DID Anti-DID field directs pairs towards the extraction line DID is integrated to the SiD solenoid (talk by W. Craddock) Total pair energy hitting the BeamCal drops from 20 TeV/BX to 10 TeV/BX but the radiation dose can reach 100 Mrad/year. BeamCal centered on the extraction line Y (cm) X (cm) Y (cm) X (cm) 6

7. Beam parameters from BeamCal Observables Δ BeamPar Taylor Matrix nom = + * observables: – total energy – first radial moment – inv. radial moment – l/r, u/d, diag asymmetries – E(ring ≥ 4) / Etot – E / N – phi moment – inv. phi moment – f/b asymmetries  beam parameters (diff and av) –bunch sizes –emittances –beam offsets –waist shifts –bunch rotations –profile rotations –number of particles FCAL Collaboration 7

8. BeamCal R&D for DBR Radiation hard Silicon sensor R&D (talk by B. Schumm) FCAL chip development Electron tagging and  veto study 8

9. FCAL chip Dual-gain front-end electronics: charge amplifier, pulse shaper and T/H circuit Successive approximation ADC, one per channel, 32 channels per chip Digital memory, 2820 (10 bits + parity) words per channel Analog addition of 32 channel outputs for fast feedback; low-latency ADC Amplification of signals between 37fC and 37pC in 10 bits equiv. dynamic range Filtering and digitization (10 bits resolution) Storing all information during bunch train for each bunch-crossings from 32 cells Calibration between trains or between runs Provide physical and feedback readout (digital) Abusleme (Stanford ), Dragone, Haller (SLAC) 9

10. The Bean V1.0 Prototype 3 channels No digital memory 180 nm TSMC process 72 pads, 2.4 mm x 2.4 mm 7306 nodes, 35789 circuit elements A day after Ph. D defense, Abulsleme left the US. Manpower is needed to make progress. 10

11. BeamCal e- Detection: Algorithm Electron Tagging Algorithm 1. Locate probable shower axis by testing for the most energetic cylindrical cluster 2. Discard energy deposition in the shallow region of the BeamCal (beamstrahlung mostly deposited here). 3. Discard energy deposition more than 5mm from the shower axis (aprox. Moliere radius) 11 Oleinik (Colorado)

12. BeamCal e- Detection: Algorithm Electron Tagging Algorithm 4. Subtract mean beamstrahlung energy from remaining BeamCal energy 5. If the subtracted BeamCal energy is greater than 3 standard deviations of the average beamstrahlung energy, tag the cluster 12

13. BeamCal e- Detection: Results 13

14. FCAL Collaboration Design No detailed mechanical design will be made for the DBD. Will follow FCAL collaboration development. BeamCal mechanical design 14

15. Conclusions Radiation hard Silicon sensor R&D will be carried out by UC-Santa Cruz/SLAC. First prototype of FCAL chip has been fabricated and tested successfully. Need manpower to make progress. BeamCal simulation study will continue. 15 LumiCal No critical R&D for the DBD Alignment issue needs to be addressed in MDI Push-pull. BeamCal