1 R&D Advances: SiW Calorimeter LCWS 2010 Beijing SiD Concept Meeting March 28, 2010 John Jaros for SiD SiW Group (thanks to Ray, Ryan, Mani, and Marco.

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Presentation transcript:

1 R&D Advances: SiW Calorimeter LCWS 2010 Beijing SiD Concept Meeting March 28, 2010 John Jaros for SiD SiW Group (thanks to Ray, Ryan, Mani, and Marco for slides)

SiD SiW Group Pixel Detector Development and Readout U Oregon (Brau, Frey, Strom) KPiX Readout Chip and Mechanical Prototype SLAC (Breidenbach, Freytag, Graf, Haller, Herbst, Jaros, Nelson) BNL (Radeka) LAPP, Annecy (Karyotakis) Bump Bonding and Flex Cables UC Davis (Lander, Tripathi, Holbrook) MAPS Alternate (not covered in this talk) RAL (Stanitzki, Strube, Tyndal) 2 GOALs: Develop a Silicon-tungsten Electromagnetic Calorimeter for SiD Produce a Test Module (employing “real” detector technologies) for Beam Test

3

Sensor Status Have Hamamatsu sensors in hand 10- V1 used for interconnect studies 40- V2 under test and for prototype Plan for this Spring. With a 512-channel KPiX-9 bump-bonded to a sensor, get noise measurements for the full range of input capacitances and resistances. R Frey SiD Cal 18Feb20104 V2 Sensor

R Frey SiD Cal 18Feb20105

KPiX Status KPiX-8 (256 channel) under test. * Noise measurements rms = 1300 e- (5% mip) OK for Ecal * mW/1000 channel KPiX-9 (512) just arrived SLAC. Design includes * Further noise reduction * Power reduction (->20 mW) * More input protection for GEMs KPiX-10 (1024) order Summer ‘10 R Frey SiD Cal 18Feb20106

7

8 Interconnect issues: Technologies being considered PrototypingProduction KPiX to SensorGold Stud Bonding (Epoxy/Thermo-compression) Indium/Solder Bump Bonding Flex Cable to SensorSolder Balls Conducting Epoxy Anisotropic Conducting Film (ACF) ACF? Indium/Epoxy ACF/Epoxy/Solder

9 KPiX with Gold Studs Studs are well- formed and centered on the 70x70  m pads.

10 Gold Stud Attachment Three possibilities: 1.Conducting Silver Epoxy. High degree of bump height uniformity required. No limit on number of bumps. Low temp and pressure. Good success for large pads (>100 um). Work in progress for 50 um pads. 2.Thermo-compression. Typically, high temp and pressure: C and g/bump. Machine limit ~ kg => Limits total number of bumps. 3.Thermosonic. Lower temp and pressure: 150C and 75g/bump. Limit on total number of bumps because of the limit on total deliverable ultrasonic power without breaking the chip.

R Frey SiD Cal 18Feb gold-stud attachment via thermo-compression – preliminary results 160 g/bump provides acceptable resistances for all bumps 100 g/bump was insufficient: 4 of 20 bumps were ~open Further study required:  Explore pressures greater than 160 g/bump  Pressure > 1 GPa gives some punchthrough of SiO2 between sensor metal layers – need to optimize temperature (gold softness) and Press 1 Ohm 0 Ohm bump bond id 160 grams/bump

12 Thermoplastic Conducting Adhesive (ACF) Btechcorp: Metal fibers in a matrix ~2 x 10 7 fibers/in 2 Low Cure pressure: 50 psi Conductive Resistive 8 um nickel fiber structure. close-packed array  Initial results are promising. Goal for Flex Cable pads (100 sq mil) is ~100 m Ω, which is achievable.

Plan to make a full scale prototype, full width, full thickness, short zee length Stainless steel in place of Tungsten We have 30 plates SS304L, 36”x48” Perfect Test bed for the small screws design The integration of the electrical interconnections the cooling cold plates ECAL Mechanical prototype

M2x6 screw + spacer M2 tapped hole ECAL Mechanical prototype

R Frey SiD Cal 18Feb Summary goals, progress, plans Year 1 (7/2009–7/2010) Year 2 (7/10-7/11) Year 3 (7/11-7/12) GoalComplete R&D on component technologiesAssemble test module, start beam test Beam test, data analysis Status Sensors – OK Tungsten – OK KPiX – 512 channel chip to be evaluated. If ok, order 1024 KPiX. KPiX-Si bumps: need to converge on technology – gold stud thermo-compress? Flex cable – ok Cable-Si connect: needs R&D – ACF? Need the integrated tests first. Flex cable can be done separately; same for DAQ tbd Plan Have 1024 KPiX and bumping technology by summer for combined testing in lab. (512 KPiX would be ok for initial combined tests.) indium/solder bb as fallback for gold studs Need to finalize cable-Si technology If integrated tests look OK, begin planning for beam test. Assume SLAC beam for now. tbd