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LOI Planning The Very Forward Region Tom Markiewicz/SLAC Takashi Maruyama/SLAC Uriel Nauenberg/UCB SiD Collaboration Meeting, Boulder, CO 19 September.

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Presentation on theme: "LOI Planning The Very Forward Region Tom Markiewicz/SLAC Takashi Maruyama/SLAC Uriel Nauenberg/UCB SiD Collaboration Meeting, Boulder, CO 19 September."— Presentation transcript:

1 LOI Planning The Very Forward Region Tom Markiewicz/SLAC Takashi Maruyama/SLAC Uriel Nauenberg/UCB SiD Collaboration Meeting, Boulder, CO 19 September 2008

2 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 2 of 21 EXCEL pix of September 2008 Design LUMICAL Support LUMICAL BEAMCAL BEAMPIPE POLYCARBONATE W Mask

3 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 3 of 21 LOI Outline of SiD FCAL Subsystem 1.1 System Definition –1.3.1 Lumical –1.3.2 Beamcal –1.3.3 Tungsten Mask –1.3.4 Low Z Mask –1.3.5 Cantilevered support –1.3.6 Beampipe (with VXD group; description assumed to be elsewhere-Global issue?) –NOT GammaCal (Posipol, Espec group) Vacuum (if any) (MDI) Not interface to QD0 nor fast feedback system 1.2 Contact authors –TWM & TVM

4 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 4 of 21 1.3 Geometry 1.3.1 Lumical –Ecal structure: 1 + 20-2.5mm + 10-5mm –OR=19.5cm on magnet axix –IR = 6.0cm centered at 1.6m x 0.007 = 1.1cm below axis –Z_start=ECAL_start-10cm=1.58m 1.3.2 Beamcal –Z_start=2.95m for historical reasons as all background calculations for pairs depend on this Consistent with L*=3.5m and 10cm behind beamcal for flanges, bpm to QD0 cryostat –50 layers of 2.5mm W + tbd “Si” readout –1.5cm radius exit hole, 1.0cm entrance hole at ±3m x 0.007 –OR=~12.5cm centered on detector axis, dependent on W mask and support structure details 1.3.3 W Mask –3cm tungsten, conic at 31mrad, offset in radius from 6cm Lumical by 2cm = 8cm at Lumical back end 1.3.4 Low Z mask –13cm Polycarbonate with 25cm OD and same apertures as Beamcal

5 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 5 of 21 1.4 Function 1.4.1 Lumical –Luminosity –Luminosity Spectrum –Hermiticity –Two Photon Veto 1.4.2 Beamcal –Beam Parameters and Luminosity –Two photon Veto 1.4.3 Tungsten Mask –Protect TRK, HCAL from pair photon albido 1.4.4 Low Z Mask –Protect VXD, TRK, HCAL from pair charged albido 1.4.5 Cantilevered Support Tube –Stiff, accurate, vibration free support for FCAL, masks, beampipe and VXD

6 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 6 of 21 1.5.1 Lumical Requirements & Specifications 1E-3 resolution on luminosity measurement MIP sensitivity: S/N > 10 Hardware –Radial segmentation –Angular resolution –Dynamic range –B/C time resolution or adequate buffer space –Alignment –Petal-to-Petal dead space –Support –Electronics cooling Physics Benchmarks –Bhabha scattering

7 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 7 of 21 1.5.2 Beamcal Requirements & Specifications Hardware Radial segmentation Angular resolution Dynamic range B/C time resolution Radiation Hardness Alignment Petal-to-Petal dead space Support Electronics cooling Physics Benchmarks E+e- pairs via QED processes Stau production Efficiency of two photon veto

8 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 8 of 21 2.0 Description of FCAL Subsystem 2.1 Concept Redundant, described in 1.3, 1.5 2.2 Baseline Design Redundant, described in 1.3, 1.5 2.3 Expected Performance Redundant, described in 2.5

9 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 9 of 21 2.4 FCAL System Illustrations Mechanics –Plan view such as slide 2, this ppt

10 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 10 of 21 2.4.1 Lumical Performance & Specification Illustrations Energy resolution (TVM, slide 14) Luminosity resolution –radial segmentation –Phi segmentation –Longitudinal segmentation & depth Hermiticy (TVM, slide 6) –Longitudinal position of Lumical Mechanics –Petal layout from 6” wafers

11 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 11 of 21 Suggested LumiCal Tables & Figures

12 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 12 of 21 2.4.2 Beamcal Performance & Specification Illustrations Energy resolution &/or electron identification efficiency as a function energy, radial distance from extraction line axis and phi for 2-photon events Stau pt distribution for signal/background w & w/o 2-photon veto Baseline: –Lumi r-phi segmentation, –non-projective geometry Constant radius hole appropriately displaced from cylinder axis by the same amount for each of 50 layers

13 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 13 of 21 2.4.3 W Mask Performance & Specification Illustrations Tracker & HCAL Backgrounds as a function of –Mask thickness –Lumical – Beamcal separation –Beamcal z loaction

14 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 14 of 21 2.4.4 Low Z Performance & Specification Illustrations Tracker/HCAL backgrounds as function of mask thickness

15 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 15 of 21 2.4.5 Mechanical Support Performance & Specification Illustrations Mechanical 3D picture Deflection under load –could be a one number quote or a diagram vs. annular thickness Vibration modes (could be text)

16 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 16 of 21 2.5 Options and Unresolved Issues 2.5 Global FCAL –Installation & Servicing 2.5.1 Lumical –Readout design –Alignment verification/measurement 2.5.2 Beamcal –Choice of sensor –Readout design –Beamcal OD & junction with support & W mask 2.5.3 W Mask –Engineered design that dovetails with beamcal and lumical 2.5.4 Low Z Mask 2.5.5 Support –Needs engineered, as opposed to conceptual, design –Reproducible alignment of Lumical to ~30 um –Adverse influence on QDO vibration spectrum 2.5.6 BeamPipe –HOM heating, cooling & wakefields due to abrupt radial transitions

17 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 17 of 21 3.0 R&D Roadmap (1) 3.1 R&D Issues Choice of Beamcal Sensor Development of appropriate front end electronics 3.2 R&D Milestones Prototype Lumical: 1 petal (360°/32) Prototype Lumical beam test –Single electron response Prototype BeamCal: 1 petal Prototype Beamcal beam tests –Radiation Hardness Test –Single electron response –Response to showering electrons

18 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 18 of 21 3.0 R&D Roadmap (2) 3.3 Resources Need Manpower not yet estimated M&S not yet estimated

19 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 19 of 21 4.0 Cost Estimate None: See MIB or some other chapter in LOI

20 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 20 of 21 5.0 Anticipated IDAG Questions & Answers None

21 2008.09.19 Boulder SiD CM: FCAL LOI T. Markiewicz/SLAC 21 of 21 6.0 Organization of the FCAL Group 6.1 Institutions Involved Beampipe: FNAL & SLAC Beamcal: FNAL, SLAC, UCB Lumical: SLAC Readout: SLAC Mechanics: SLAC

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