1. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 DCH R&D- Italy

2. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 DCH: What We Want I. A lighter structure, all in Carbon Fiber (CF) because we know this can be done investigate possible options II. A faster detector, with faster R.O. electronics because we know life will be tougher @ SuperB Simulations, R&D studies with prototypes III. Lighter FEE (including shielding & cooling) because we may want to place detectors behind the DCH backward endplate now DCH: What We Know The BABAR DCH worked well for almost 10 years

3. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Spherical Carbon-Fiber end-plates PRELIMINARY!  Minimize thickness at fixed deformation Thickness O(4mm), or 0.015 X 0 compare 0.13 X 0 in BABAR Convex shape could fit better e.g. with forward PID device Convex Concave

4. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 A possible occupancy issue High background rates expected in the forward region to be quantified with detailed simulations high occupancy in innermost cell layers, possibly tamed with: tapered endplates screening the sense wire discussed in next slides

5. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Screening the sense wire  Prevent electron multiplication in selected regions along sense wire  To test the idea: we built drift tubes, with part of the sense wire ‘screened’. sense wire “good physics track” plastic collar ionization in very forward region 30  m W (Au-plated) wire 80  m inner Ø, 120  m outer Ø ~10cm long peek tube

6. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Scan the wire with a 90 Sr source: Current vs. source position Free wire Start of plastic tube Further down the plastic tube End plug “A” No source End plug “B”  Preliminary tests indicate that screening the sense wire works as expected e.g. current drops to half the value when 90 Sr source exactly placed beginning of screen  Next step is measuring charge and time-to-distance with MIPs.  Need also to consider carefully: Long-term behavior/aging (Modify the wire diameter instead?) Stringing issues

7. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Re-commissioning of DCH prototype  Started re-commissioning of small DCH prototype Wires OK Electronics OK Gas tightness OK  Read out few channels Signals look good Need more electronics to read out all  underway  Can easily replace bolted end plates with new ones with different cell geometries 30-May-2008Elba Super-B Workshop 7 Re-commissioning of precision tracker  First pass with coarse space-time relations  achieved resolution of 120  m  on-board electronics for all 52 channels being designed, to be ready after Summer

8. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Summary and Outlook  Evaluating different solutions with an all-Carbon- Fiber structure  Perform test of wire screening with MIP ’ s  Completing set up of all necessary tools for our R&D plan  Proceed with Garfield simulations of various cell geometries to select few solutions to test  Build new prototype ’ s end plates with different cell geometry solutions  Prepare for test beam

9. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 PID R&D- USA Whether there is, or is NOT, a forward PID system depends on there being a clear, strong physics case. If there is such a case, the technology chosen for a forward PID system depends on # physics requirements on which momentum region is most useful; # photo-detector choice; # engineering issues; # background resistance; # cost. Adequate backward PID may be obtained by a fast backward EMC instead of a separate detector. This option should be carefully explored Ongoing R & D includes work on Photon detectors, fast timing, and Aerogel radiators Even without the EC PID devices, major effort is required to design and construct the new SOB and DIRC photon detection system. New groups/individuals interested in PID design and R&D are strongly encouraged to join the effort. See JJV talk

10. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 EMC R&D- USA

11. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008

12. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 IFR R&D- Italy

13. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 IFR: R&D status IFR: R&D status adc channels 1 p.e. 2 p.e. pedestal ADC spectrum for MPPC 1.5 p.e. Cut Average number of p.e.: ~ 9 at maximum distance (~4m) Efficiency better that 95% Detailed study of SiPM and MPPC signal characteristics: a lot has been done, still more to do Present baseline configuration: Scintillator: 1.5cm thick with embedded hole /surface groove Fiber: One Saint-Gobain BCF92 1.0 mm diameter Readout: Geiger mode APDs from Hamamatsu or IRST-FBK counts Distance ~200 cm sigma 1.3 ns Distance ~200 cm sigma 1.8 ns MPPC SiPM The time resolution is < 2 ns and is better with SiPM (IRST) than with MPPC (Hamamatsu)

14. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Simulation  A first description of the IFR is ready for Geant4 simulation.  First events have been generated and analyzed for consistency checks.  Further validation will be done with more statistics. Need full reconstruction to obtain a fine detector optimization. The plan is to use the BaBar framework + SuperB background events. Fast simulation: plan to release a preliminary version useful for physics by the end of June Then improve the parameterization according to the detector optimization.

15. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 SuperB IFR path to TDR For the TDR: Simulation  requested detector performance Simulation  requested detector performance Detector Design Detector Design  Scintillator  Fiber  Photodetector: time resolution, afterpulses, noise, radiation hardness  Electronics + DAQ  Preliminary Detector Layout, including preliminary mechanics/detector integration (Summer09) Prototype Design  Construction (starting Sept09) Prototype Design  Construction (starting Sept09) Prototype Beam Test (Spring 2010) Prototype Beam Test (Spring 2010) Final Layout for TDR (Summer/Fall 2010) Final Layout for TDR (Summer/Fall 2010) At present: Ferrara, Padova, Roma1 Institutions A lot of work to be done for TDR,additional forces very helpful and welcome! A lot of work to be done for TDR, additional forces very helpful and welcome!

16. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Computing Developments

17. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Computing Developments

18. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Computing Developments since Elba Summer! Formation of the computing planning group - Gregory Dubois-Felsman (chair) - David Brown - Peter Elmer - Fabrizio Bianchi - Roberto Stroili - Mauro Morandin (ex-officio) Still need contributions from detector community Status report at R&D meeting tomorrow

19. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Summary of BaBar Reuse, Transport,& SuperB Home-Bill  BaBar Disassembly starts soon; lasts ~4 years.  Components for re-use in SuperB, namely the EMC Barrel, DIRC bar boxes and support structure, and coil and cryostat with support systems, are removed from the barrel steel for move to SuperB in mid-2010. EMC Barrel transfer Tor Vergata: hope to ship as a unit, preferably by air. Engineering is needed to determine if this is feasible. If not, disassembly of the barrel down to 280 modules (each typically 21 crystals) and support cylinder structures will add considerable time until the installation of the EMC Barrel into SuperB. Additional environmentally conditioned assembly space would be required in the disassembly case. DIRC transport as a single structure is not practical: structures are too big and require vertical transport due to bar box construction. It is best if bar boxes are removed and shipped separately. Magnet cryostat has been shipped from Ansaldo to SLAC by air, providing proof of principle for return to Italy. Steel will arrive somewhat later, by boat, after the sextants are separated from each other and split in two.

20. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 BaBar Reuse, Transport, SuperB Home

21. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 BaBar Reuse, Transport, SuperB Home  Site of SuperB hall will provide a spacious home, properly sized from experience at IR2, for these systems.  Coexistence with the embedded accelerator final focus cryostats promises to be challenging.

22. Blair Ratcliff, SLACUS R&D Meeting, Sept. 3, 2008 Summary  We are beginning to develop beyond our conceptual design (as presented in the SuperB CDR) for the SuperB detector, based on BaBar.  Substantial Planning, Design, and Physics and Detector simulation studies are needed to continue the process.The individual Subsystems need R&D and appropriate software tools to develop the best detector components within this overall design.  Impressive progress on software and simulation tools  We hope to move to a high quality technical design and TDR within ~ 2 years.  All areas need more people. Many opportunities exist to get (even more?) involved in the detector, including subsystem R&D and general detector systems, software, physics simulation, and design. 22