1. J-C Brient LLR -2002 1 - Progress report on the ECAL prototype 2 - New informations on the cost of the W-Si ECAL 3 - A proposal for a new design of the detector slab 4 - Conclusion News of the CALICE - ECAL Sampling calorimeter tungsten-silicon

2. J-C Brient LLR -2002 Mid-march  A first sample of tungsten plates arrives at LLR => metrology  The design of the front-end chip is fixed. First batch for test.End-march  Production of the final set of masks for the silicon wafers processingBeginning-April  Start the production of a sample of 40 tungsten plates corresponding to the first technological test and first stack of prototypeApril-May  Processing of the first 25 silicon wafers (DC coupled)May-September  Processing and test of about 100 silicon wafers  Final submission of the VFE chip for the prototype Progress report on the prototype

3. J-C Brient LLR -2002 Metrology of the first 3 tungsten plates made at LLR It confirms the good quality of the plates As measured at IHEP and ITEP

4. J-C Brient LLR -2002 Second configuration : using PCB solution + internal Frond End (C / W) structure type H Front End electronics Silicon wafer PCB Cooling system Aluminium Signals output Technological prototype – detector slab

5. J-C Brient LLR -2002 PCB and Front End electronics details : Silicon wafer Composite Tungsten PCB Front End electronics Flexible circuit max 4.5 mm Possible thickness for Front End electronics in this case : 4.5 mm Physics prototype – detector slab

6. J-C Brient LLR -2002 Physics prototype – cosmic tests Cross-section 1 st X-Y line (scintillating fibers) 2 nd X-Y line (scintillating fibers) 4 silicon wafer tested Detector slab 1 mm - Measurement surface : 128  128 mm - Precision : 0.5 mm

7. J-C Brient LLR -2002 0.1 ATLAS CDF GLAST CMS NOMAD AMS01 CDF LEP DO Silicon Area (m²) 100 1000 10 1 ~ 2000 m² DATA From H.F-W. Sadrozinski, UC-Santa Cruz Moore's Law for Silicon Microstrip Detectors Some interesting distributions (updated recently) About the cost of the W-Si ECAL

8. J-C Brient LLR -2002 DATA From H.F-W. Sadrozinski, UC-Santa Cruz 50 (Guestimate from H.S.) WARNING : cost (2010) < 2 $/cm² is for microstrip Processing cost/area ($/cm²) Moore's Law for Silicon Detectors Used in the TDR BUT for ECAL W-Si  Number of masks (x 0.5 )  Industrial Yield (x 2 )  use of 8'' wafers ? At least a factor 2 cheaper is expected Cost << 2 $/cm²  Blank wafer price 6'' < 2 $/cm² 1 2 10 4'' 6'' Wafer size New elements for the cost of the ECAL

9. J-C Brient LLR -2002 Re-calculate the estimation of cost, using the 2 € /cm²for the silicon  The cost of the ECAL is between 68 (20 layers) to 99 (40layers) M €  With the HCAL (i.e. version DHCAL), the total cost of the calorimeter ranges from 129 (20 layers) to 175 (40 layers) MCH (CMS equivalent is 145 MCH) 1 - For the complete set ECAL + HCAL + Muon-CH ( MCH) 2 - The change of the geometry can further reduce the cost (length of barrel, internal radius,...) CMS Calice -FLC 216 132/178 18/40% reduction

10. J-C Brient LLR -2002 Proposal for a new design of the detector slab  There is a very small available space for the VFE board (0.2x1x2cm³)    Number of bonding/cm on the VFE board (about 160/cm)    Some risk of pick-up noise (EMC) (coherent noise with 32 Mchannels)    Number of wires/lines per cm in the flex (from diodes to VFE)     Industrial feasibility for these processes seems difficult     COST Why ? What else ? START from usual electronics industrial processes 1 - Use PCB with low density readout strip 2 - Keep industrial yield of the silicon diodes as high as possible 3 - Keep the small thickness of the total 4 - Keep the pad size open (from 0.5 to 1.5 cm) (SD, LD,...or Rext. TPC)

11. J-C Brient LLR -2002 Point 1  Multiplexing inside the alveolus  VFE chip inside PCB low density  cooling inside ?? My comments UP to 200cm PCB low density is quasi-INDUSTRIAL (130 cm is already in the box) Point 2  VFE and Si wafer have independent fabrication process Industrial Yield (VFE is not ``bump bonded'' on the wafer)  VFE chip on one side of PCB and diodes on the other My comments - No thermal dissipation through the silicon wafer - Put a silicon wafer on one side and VFE chip on the other side is INDUSTRIAL Point 3  Thin packaging, large area VFE chip Small overall thickness My comments Thickness of the VFE-chip packaging  1mm is INDUSTRIAL Point 4  The pad size depends on the power/channel, cooling system Adaptable pad size and duty cycle of the VFE My comments The pad size can be as low as 0.5 cm

12. J-C Brient LLR -2002 Calculation by J.Badier (LLR) With 5mW/c (which not so easy...) 1 - A cooling is NEEDED (at the middle of a module,  T  400°) 2 - I t is not so demanding for the thickness Rectangular tube 1mm x 20 mm  bar/m

13. J-C Brient LLR -2002 Pad Silicon wafer PCB Aluminium Cooling tube VFE chip 1.1 mm 1.0 mm 0.5 mm Thermal contact if needed Conductive glue for electrical contact AC coupling elements if needed powerline command line signal out Budget (mm) 0.3 Al(sup) 0.1 Glue 1.0 VFE  2-3 cm Transverse view - New design of the detector slab - ECAL 0.3 mm

14. J-C Brient LLR -2002  A priori, all processes are uncorrelated (Si wafer, VFE chip, PCB,...) we could expect a good Industrial Yield  A priori, all processes are (quasi-) industrial  The mounting of the detector slab is a classical job for electronics industrial  Probably easier access to VFE board (not so trivial argument)  Technically, There are interesting challenges, BUT there are no orders of magnitude to gain  Almost feasible today  What is the behaviour of a VFE chip when a 400 GeV e.m. Shower goes through ?? Advantages Drawbacks Could (and will) be rapidly tested Advantages and drawbacks

15. J-C Brient LLR -2002 Conclusions New design of the detector slab  A lot of advantages - INDUSTRIAL processes  The extrapolation from VFE chip is reasonable  The extrapolation for the readout lines is reasonable Costing of the calorimeter for FLC  The project is in the extrapolation of the Moore's law for the cost and area of silicon to be processed  Very probably, the processed silicon wafers will be <2 $ / cm ² cost reduction when compared to the equivalent in CMS  Even with W-Si ECAL, there is an important cost reduction when compared to the equivalent in CMS Progress report on the prototype  Tungsten, first plates arrived, first sample soon in production  Silicon wafers, final masks have been designed  VFE chip is in production for the first batch (test) CALICE Collaboration