SuperB workshop SLAC, October 6, 2009 2 Outline Present Design Some thoughts about tile production Updated cost estimate Light yield studies of 3 mm thick.

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Presentation transcript:

SuperB workshop SLAC, October 6, Outline Present Design Some thoughts about tile production Updated cost estimate Light yield studies of 3 mm thick scintillators Effects from n irradiation Conclusion and next steps

SuperB workshop SLAC, October 6, Present Design The backward endcap calorimeter is a 12 X 0 Pb-scintillator sampling calorimeter, 24 layers of 0.3 mm thick scintillator strips 0.28 mm thick Pb It is located behind the DCH at z=-132 cm and is 14 cm deep It has been moved back by 22 cm to leave more space for DCH electronics Inner and outer radii are unchanged: r i =31 cm, r o =75 cm We use 3 different shapes of strips: Right-handed spiral strips Left-handed spiral strips Sector strips The 3 layers will alternate 8 times (increase r i ?)

SuperB workshop SLAC, October 6, SuperB Design Rearendcap: Position: r i =31 cm, r o =75 cm, z i =132 cm, z o =146 cm

SuperB workshop SLAC, October 6, Layout of Scintillator Planes Alternate 3 different strip shapes 8 times  24 layers in total There are 48 strips per layer yielding 1152 strips Due to the different strip shapes each layer needs to be assembled completely  no split into halves is possible  need to remove beam pipe if calorimeter has to be taken out Left-handed spiral Right-handed spiral Sectors

SuperB workshop SLAC, October 6, Thoughts on Spiral Strip Production Production of spiral strip poses problems Production of spiral strip poses problems For 75 cm x 75 cm plates, For 75 cm x 75 cm plates, need 4 plates/layer get only 7 complete strips/plate get only 7 complete strips/plate 10 strip segments/plate For 50 cm x50 cm plates For 50 cm x50 cm plates need 8 plates/layer and larger inner radius need 8 plates/layer and larger inner radius all strips are segmented into 2 pieces all strips are segmented into 2 pieces Production of individual strips cut out of 50 cm x50 cm plates Production of individual strips cut out of 50 cm x50 cm plates Get around 4 strips with a lot of waste Get around 4 strips with a lot of waste Segmented strips are connected by one WLS fiber Segmented strips are connected by one WLS fiber Need to fix alignment of neighboring plates to relieve force on Need to fix alignment of neighboring plates to relieve force on WLS fiber WLS fiber

SuperB workshop SLAC, October 6, Spiral Strip Production Red: 50 cm x 50 cm Blue: 75 cm x 75 cm Need 8 small (red) or 4 large (blue) plates per plane Old cost estimate is approximately correct for 8 small plates

SuperB workshop SLAC, October 6, Updated Cost Estimate Scintillator material: 10 5 cm 3 (89 Kg), St Gobain BC 408 sheets: 50 cm x50 cm $515 ea, 75 cm x75 cm $876 ea  100k$ Labor: 800 h for cutting sides and grooves (free)   80k$ Pb sheet: 10 5 cm 3, (1120 Kg), 20$/Kg  100 sheets, size 75x150 cm 2  22k$ Labor: 100 h for cutting rings  10k$ MPPCs: 1152 detectors, 30 € (w/o tax)   52k$ Fiber: 63 m, 1 mm Y11 fiber, 500 m   3k$ Frontend electronics: LAL SPIROC chip? 1 LED/strip plus driver 100$/channel  115k$ Support structure, Al-carbon fiber ?  100k$ Total  ~402k$

SuperB workshop SLAC, October 6, Properties of BC Scintillators We ordered cast scintillator from St Gobain (Bicron) BC-408, due better match of scintillator light and Y11 fiber absorption spectrum But BC-404 may be even better, since it is faster

SuperB workshop SLAC, October 6, Preparations for R&D and Prototype Scintillator: Ordered BC-408 from St Gobain, 3 mm thick, cast, plates of 50 cm x 50 cm cost $515 each plates of 50 cm x 50 cm cost $515 each plates of 75 cm x 75 cm cost $876 each plates of 75 cm x 75 cm cost $876 each Y11 fiber: Get a few m free samples, 500 m fiber (minimum) costs € m fiber (minimum) costs €2100 3M super reflector: ordered Pb: still looking for vendor MPPC: We have 10 detectors 1 mm x 1mm (1600 pixels) for full detector we got a quote of ~€ 30/MPPC for full detector we got a quote of ~€ 30/MPPC Readout electronics: Have 2 SPIROC chips from LAL (36 channels/ea)  Looks like the right choice  Looks like the right choice

SuperB workshop SLAC, October 6, SPIROC Chip SPIROC: dedicated very front-end electronics for front-end electronics for an ILC prototype hadronic an ILC prototype hadronic calorimeter w SiPM readout calorimeter w SiPM readout Designed to provide large dynamic range low noise low consumption high precision large # RO channels SPIROC is an auto-triggered, bi-gain, 36-channel ASIC  allows to measure the charge Q from one p.e to 2000 p.e. (on each channel)  allows to measure the charge Q from one p.e to 2000 p.e. (on each channel)  allows to measure the time t with a 100ps accurate TDC  allows to measure the time t with a 100ps accurate TDC Analogue memory array (depth of 16 for each) stores t and Q measurements Analogue memory array (depth of 16 for each) stores t and Q measurements 12-bit Wilkinson ADC is embedded to digitize analogue memory contents (t & Q on 2 gains)  data are stored in a 4kB RAM 12-bit Wilkinson ADC is embedded to digitize analogue memory contents (t & Q on 2 gains)  data are stored in a 4kB RAM High-level state machine is integrated to manage all these tasks High-level state machine is integrated to manage all these tasks automatically and control the data transfer to the DAQ automatically and control the data transfer to the DAQ

SuperB workshop SLAC, October 6, SPIROC Properties Linearity Linearity Residuals Signal shape Noise SPIROC gives Gaussian signals with no tails, shows excellent SPIROC gives Gaussian signals with no tails, shows excellent linearity and low noise linearity and low noise

SuperB workshop SLAC, October 6, First Tests of 3mm Thick Tiles Test 3mm thick 3 cm x 3 cm tiles using 106 Ru source Test 3mm thick 3 cm x 3 cm tiles using 106 Ru source Tiles are wrapped with 2 layers of Teflon tape, (reflector not Tiles are wrapped with 2 layers of Teflon tape, (reflector not optimal)  AHCAL uses 3M super reflector optimal)  AHCAL uses 3M super reflector Attach MPPC on one side of tile on fiber or directly on tile Attach MPPC on one side of tile on fiber or directly on tile Place source in the center of the tile Place source in the center of the tile For SuperB readout via WLS fiber has advantages For SuperB readout via WLS fiber has advantages

SuperB workshop SLAC, October 6, Direct Readout of 3mm Thick Tiles Pedestal is suppressed Pedestal is suppressed Individual pixels are visible MIP peaks lie around 5 pixels for direct RO & ~8 pixels for for direct RO & ~8 pixels for fiber RO fiber RO Expect peak ~7.8 pixels for fiber RO fiber RO Direct readout 3 mm tile MPPC Fiber readout 3 mm tile MPPC 5 mm tile SiPM Why aren’t pixels Better resolve?

SuperB workshop SLAC, October 6, Cross Talk Measurement MPPC MPPC Machine two tapered strips that are separated by cuts (in preparation) separated by cuts (in preparation) Start with ~50% bridges and measure Start with ~50% bridges and measure cross talk cross talk Remove bridges down to 1-2% in steps Remove bridges down to 1-2% in steps to establish a relation of cross talk vs to establish a relation of cross talk vs size of bridges size of bridges Redo study for full size Redo study for full size Repeat measurement for spiral strips Repeat measurement for spiral strips for chosen bridge size for chosen bridge size mirror

SuperB workshop SLAC, October 6, Neutron Irradiation of MPPCs From talk by T. Takeshita CALICE meeting Sep 17, 2009

SuperB workshop SLAC, October 6, Gain and Leakage Current No significant changes on the gain due to neutron irradiation Huge increase in leakage current for neutron flux > 3x10 9 /cm 2

SuperB workshop SLAC, October 6, Hot Spot Pictures Observe increased number of hot spots after irradiation of 3x10 9 n/cm 2 3x10 9 n/cm 2

SuperB workshop SLAC, October 6, Noise Rate and Cross Talk Significant changes on noise rate already for 3x10 9 /cm 2 Significant changes on noise rate already for 3x10 9 /cm 2 No significant changes on the cross talk No significant changes on the cross talk probability probability

SuperB workshop SLAC, October 6, Saturation Curve Observe no significant change on the saturation curve Observe no significant change on the saturation curve Results look consistent with ITEP measurements Results look consistent with ITEP measurements

SuperB workshop SLAC, October 6, Conclusion We started to order components needed for R&D We are working on getting quotes from companies for the prototype the full detector and the full detector We need to decide on optimum plate geometry for strip production We need to decide on optimum plate geometry for strip production We started with light yield measurements We started with light yield measurements SPIROC is promising readout chip SPIROC is promising readout chip Neutron radiation is a concern, for fluxes above 3x10 9 /cm 2 MPPCs clearly show damage effects consistent with ITEP measurements Neutron radiation is a concern, for fluxes above 3x10 9 /cm 2 MPPCs clearly show damage effects consistent with ITEP measurements  may need shielding  may need shielding

SuperB workshop SLAC, October 6, Next Steps Measure cross talk of two neighboring tiles, tapered shape Look at uniformity Measure cross talk of full spiral-shape strips Study light yield of two segmented strips connected by fiber Test readout with SPIROC, interface to DAQ used in beam test Think about calibration and monitoring Study effects of recovery from n radiation, need realistic estimates Design support structure, will talk to engineer in Bergen next week Perform MC simulations Design prototype