A new silicon detector for microdosimetry applications in ...
SD – Silicon Detector EM Calorimetry
description
Transcript of SD – Silicon Detector EM Calorimetry
![Page 1: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/1.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 1
SD – Silicon Detector EM Calorimetry
![Page 2: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/2.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 2
SD (Silicon Detector)
• Conceived as a high performance detector for NLC
• Reasonably uncompromised performance• But• Constrained & Rational cost
• We accept the notion that excellent energy flow calorimetry is required, and explore optimization of a Tungsten-Silicon EMCal…
![Page 3: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/3.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 3
Silicon DetectorEM Calorimetry
Quadrant View
0.000
1.000
2.000
3.000
4.000
5.000
6.000
7.000
8.000
0.000 2.000 4.000 6.000 8.000
m
m
Beam Pipe
Trkr
Ecal
Hcal
Coil
MT
Endcap
Endcap_Hcal
Endcap_Ecal
VXD
Endcap_Trkr
![Page 4: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/4.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 4
Scale of EMCal & Vertex Detector
![Page 5: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/5.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 5
Silicon Tungsten EMCal
• Figure of merit something like BR2/ where is the rms sum of Moliere radius of the calorimeter and the pixel size. – Maintain the great Moliere radius of tungsten
(9 mm) by minimizing the gaps between ~2.5 mm tungsten plates. Dilution is (1+Rgap/Rw)
– Could a layer of silicon/support/readout etc fit in a 2.5 mm gap? Even less?? 1.5 mm goal??
• Requires aggressive electronic-mechanical integration!
![Page 6: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/6.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 6
EMCal, continued• Diode pixels between 5 – 10 mm square on largest
hexagon fitting in largest available wafer. (6” available now – 300 mm when??) Consider tracking as well as E flow in picking pixel dimension.
• Develop readout electronics of preamplification through digitization, zero suppression and IO on bump bonded chip. Upgrade would be full integration of readout on detector wafer. (R&D opportunity!)
• Optimize shaping time for small diode capacitance. Probably too long for significant bunch localization within train. But some detector element needs good time resolution!!!
![Page 7: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/7.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 7
Channel Counts [Forget Them!!]
• We are used to pixel counts in CCD’s …– 3x108 last time, 1x109 this time, no problem
• Silicon Strip Tracker ~5x106 strips (channels??)
• EMCal ~5x107 pixels (channels??)• Don’t even think about multiplying channels
by O($10)……
• Must solve the cluster technology challenges.
![Page 8: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/8.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 8
Structure
![Page 9: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/9.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 9
Pixels on 6” Wafer
![Page 10: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/10.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 10
Zoom to Readout Chip
![Page 11: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/11.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 11
Gross System ArchitectureSilicon Diode Array
Readout Chip
Network Interconnect
![Page 12: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/12.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 12
Cross Section
![Page 13: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/13.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 13
Signal Collection from m2 board
![Page 14: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/14.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 14
Preamplifier Architecture
• Charge amplifier and shaper followed by two amplifiers with gains G1,G2 and sample & holds.
• Comparator logic to select appropriate range
• Mux and 12 bit ADC
Shaper
G2
G1
MUX
12 bit ADC
![Page 15: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/15.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 15
Noise and Muons
• Assume 300 (400-500 possible) effective e- collection at 80 e-/. signal ~ 24000 e-.
• Assuming diode capacitance of 0.3 pf/mm2, and amplifier noise of 20e-/pf+200e- – noise ~400 e-. S/N ~60, plenty good!
• Pick S/N of 7 (Figure) for minimum performance.
Noise & Muon Distributions
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
2
0 2 4 6 8 10 12Amplitude, SD Units
Pro
b
Noise
Noise,cum
Mu Signal
Signal, cum
Noise+Sig
![Page 16: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/16.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 16
Plausible Resolution Criteria
• Spread the 0.6% muon into several bins, with enough range for MIP counting to a few.
• Preliminary Monte Carlo indicates peak ionizing track density from a high energy shower to be 2200 µ equivalent. (5 x 107 e- = 8 pC.)
• Do not degrade resolution of calorimeter! Energy resolution of a sampling calorimeter with 2/3 X0 plates will not exceed 12%/√E. Say this peak should be spread over 5 bins, and take no credit for multiple sampling.
• Relaxation of these requirements now being studied with EGS.
![Page 17: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/17.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 17
Required Resolution
• High Res Bin Width=1000 e-, Emax=37 GeV,Mips=170• Low Res Bin Width=13200 e-,Emax=512
GeV,Mips=2325
Resolution vs Requirements
0.0E+00
1.0E+04
2.0E+04
3.0E+04
4.0E+04
5.0E+04
6.0E+04
0 100 200 300 400 500 600
Energy, (GeV)
Bin
Wid
th,
elec
tro
ns
12%*sqrt(E) *5 *105600
Low Gain
High Gain
![Page 18: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/18.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 18
Technical Issues• Assuming integrator full scale voltage of
around 1 V, feedback (and calibration) capacitors need to be ~10 pF. This is large for an integrated capacitor, but doable with substantial real estate.
• Plus is that this makes the bump bond pitch easy!
![Page 19: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/19.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 19
Thermal Management
• Cooling is a fundamental problem: GLAST system is ~2 mW/channel. Assume 1000 pixels/wafer and power pulsing duty factor for NLC of 10-3 (10 µsec @120 Hz), for 2 mW average power.
• Assume fixed temperature heat sink (water cooling) at outer edge of an octant, and conduction through a thick (6 oz) copper ground plane in the G10 motherboard.
• ΔT~10C.• This is fine, but it sure doesn’t work without power
pulsing!!! Holding the power down while maintaining the noise/resolution is a serious engineering challenge.
![Page 20: SD – Silicon Detector EM Calorimetry](https://reader033.fdocuments.us/reader033/viewer/2022050908/56813ff1550346895dab0813/html5/thumbnails/20.jpg)
28 June 2002 Santa Cruz LC Retreat M. Breidenbach 20
Plans
• We (Oregon and SLAC) plan to develop this design in more detail and build prototype wafers and chips.
• Test detectors in 5 Tesla field.• If successful, develop board level chip.
• Build 1 wafer wide by about 25 X0 deep calorimeter for test beam.