1. Detector Session Summary
Things to add
Btau nu
Beta’ Ks
LFV
F.Forti, INFN and University, Pisa
5th SuperB Workshop
Paris, May 10, 2007

2. F.Forti - Detector WG Summary
Highlights from the session
Detector group organization
May 10, 2007
F.Forti - Detector WG Summary

3. F.Forti - Detector WG Summary
EUDET
Gregor
EUDET is an “Integrated Infrastructure Initiative (I3)” within the EU funded “6th framework programme”
Support improvement of infrastructure for detector R&D with larger prototypes - but not the R&D itself
Will create a test beam facility (for now in DESY) that other groups can use
Very interesting for our future testbeams
Started a positive interaction
2006
2007
2008
2009
now
Demonstrator
Integration Starts
Available
Final Telescope Available
DESY
Magnet available
CERN test beam
May 10, 2007
F.Forti - Detector WG Summary

4. F.Forti - Detector WG Summary
SVT
Rizzo
Lot of activity on MAPS development, mechanical structure and cooling
SLIM5 collaboration: INFN + Minister of University and research funding
Pisa (coordination), Pavia, Bergamo,Trieste, Torino, Trento, Bologna
May 10, 2007
F.Forti - Detector WG Summary

5. MAPS results and perspectives
90Sr electrons
Landau mV
S/N=14
Cluster signal (mV)
Vthr
Noise
May 10, 2007
F.Forti - Detector WG Summary

6. F.Forti - Detector WG Summary
Mechanical issues
Bettarini
Conclusions
Provided a working design for the striplet L0
R&D ongoing for the mechanical/thermal issues of the pixel L0 with the CMOS MAPS sensor. Focus on:
power dissipation
minimize the material
The spec’s of the problem are defined:
room for new ideas and mechanical solutions!
Series of test-beams for the demonstrator
(1st starting in summer 2008 and then in 2009)
Looking for the best test-beam facility.
Cooled channel
May 10, 2007
F.Forti - Detector WG Summary

7. Fit to resolution function:
DCH
Grancagnolo
Gas = X0
(80%He+20%iC4H10)
Wires = X0
Fit to resolution function:
(from KLOE data)
l = 770  14 mm
np = 12.9  0.1 cm-1
sD = 140 mm cm-1/2
st = 4.8  0.2 ns sb b
Interesting proposal
Needs further study and investigation
Computationally very intensive
May 10, 2007
F.Forti - Detector WG Summary

8. F.Forti - Detector WG Summary
PID
Ratcliff
Three active groups: SLAC, Ljubljana, BINP
DIRC Barrel readout
Forward (Backward PID): TOF, Focusing RICH
Projected performance
May 10, 2007
F.Forti - Detector WG Summary

9. F.Forti - Detector WG Summary
Forward PID
Ratcliff
TOF resolution
Physics case
Cost/benefit analysis
Technology choice/maturity
Bench tests of fast timing PMTs are encouraging to date.
Best results with the laser diode:
- s ~ 12 ps for Npe = (as expected from 1cm thick Cherenkov radiator).
- s TTS < 26 ps for Npe ~ 1.
- Upper limit on the MCP-PMT contribution: s MCP-PMT < 6.5 ps.
- TAC/ADC contribution to timing: s TAC_ADC < 3.2 ps.
- Total electronics contribution at present: s Total_electronics~ 7.2 ps.
More to come soon….We plan to continue detector work and confirm TOF performance in a test beam run this year….However, test beams at SLAC after this year are a concern.
Križan
May 10, 2007
F.Forti - Detector WG Summary

10. F.Forti - Detector WG Summary
Forward PID
Križan
MCP PMT development in BINP
Photocathode ageing is rate dependent
Counting rate was increased from test to test keeping the integrated cathode charge constant (~5 nC)
3 MCP PMTs have the same life time as 2 MCP with protective layer
Kravchenko
May 10, 2007
F.Forti - Detector WG Summary

11. F.Forti - Detector WG Summary
EMC
Hitlin
Active group in CALTECH
(Ren-yuan Zhu)
May 10, 2007
F.Forti - Detector WG Summary

12. F.Forti - Detector WG Summary
Acceptance studies
Mazur
Btn benchmark
Basis for a cost benefit analysis of a backward calorimeter
Need to commission a full detailed study for the TDR
BKGD/Signal
with smearing
Forw acc.
BKGD/Signal
with smearing
Backw. acc.
May 10, 2007
F.Forti - Detector WG Summary

13. F.Forti - Detector WG Summary
IFR
Cavoto
R&D NOW (TO DO)
For the scintillator we are in 2002 (virtually)
No active group (yet)
Need to get going if we want to be ready in time
May 10, 2007
F.Forti - Detector WG Summary

14. Trigger/DAQ/Electronics
Luitz
Summary
“BaBar++” design of Online and DAQ seems feasible for Super B Factory
Hardware re-use very limited
Software re-use needs careful consideration
In many cases a redesign with lessons learned probably the better approach
All challenges can (probably) be solved with technology available today – just at a higher cost
More R&D in many areas needed for more detailed design
R&D Projects – further study
Detailed evaluation of channel counts, and per-channel DAQ requirements
Study backgrounds and occupancies and their effect on event sizes
Study attainable performance of L1- Bhabha veto
Assess cost of extending L1-Accept capacity to 150kHz
Headroom, no Bhabha veto, later lumi upgrades
Investigate consequences of overlapping events, triggers and trigger queuing
Queue modeling for data path to determine buffering requirements
Study adaptation of the current “Level-4” BaBar physics filter to Level-3 quantities
Look at control system alternatives to EPICS
May 10, 2007
F.Forti - Detector WG Summary

15. F.Forti - Detector WG Summary
Interaction region
Summary
We have an IR design that has acceptable SR backgrounds with a crossing angle of ±17 mrad and an energy asymmetry of 7x4
The BGB and coulomb scattered beam particles as a background need to be calculated and controlled (been done?)
Radiative bhabha backgrounds are still high due to the strong bending of the outgoing beams
The total SR power generated by the IR is high for the same reason. This can cause emittance growth. Especially vertical emittance growth since this is in a coupled region.
A through exploration of parameter space is needed to find the best IR design
Sullivan
Background simulations need:
Better organization of the software
Interfaces for the beamline optics
Interfaces for the geometry/detector
Better organization of people
Calderini
May 10, 2007
F.Forti - Detector WG Summary

16. Detector group organization
For the CDR writing we had identified subsystem editors/conveners
This structure has concluded its function
Many thanks for the effort and commitment
We should move forward to the next phase
Goals:
Advance the R&D activity as coherently as possible
Start creating the infrastructure and doing the work needed for a Technical Design Report
Prepare the ground for the formation of a collaboration
We need to keep a delicate but essential balance:
Move forward coherently
Leave room for other groups to join
May 10, 2007
F.Forti - Detector WG Summary

17. F.Forti - Detector WG Summary
R&D Perspectives
R&D will be funded at the local or regional level until there is a SuperB collaboration.
Groups approach(ed) their funding agencies to get support for what they’re interested in.
Nonetheless now that we have a CDR detector, coordination of activities is important:
Identify the most important R&D issues
Avoid duplication of effort
Act together to ask for money
Provide a structure for new activities or new groups
May 10, 2007
F.Forti - Detector WG Summary

18. F.Forti - Detector WG Summary
R&D Coordination
I think it would be useful to setup a structure of R&D conveners for the subsystems with the job of:
Keep track/coordinate activities
Help groups focus on what is needed
Provide a point of reference for groups or individuals wishing to participate
Help prepare funding proposals or reports
Each subsystem should have one or two conveners
Let’s use the rest of this workshop to discuss about names
Not all the vacancies need to be filled now
Not a life sentence: which should allow dynamic adaptation as things evolve
May 10, 2007
F.Forti - Detector WG Summary

19. F.Forti - Detector WG Summary
Subsystems
MDI (including beam pipe)
SVT (including Layer0)
DCH
EMC (including endcaps)
PID (including endcaps)
IFR
Electronics
Trigger/DAQ
Computing
Software
Beam tests
May 10, 2007
F.Forti - Detector WG Summary

20. F.Forti - Detector WG Summary
R&D Review and choices
At some point we will need a more formal R&D review process
Committee to review and monitor activity and provide advice to the management
IMHO this should be setup when the collaboration is formed or forming
For some regions it may be advantageous to create this committee earlier
We need to explore the ramifications of this proposal
Eventually we will have to make choices about technology
Usual difficult balance between good that works and better that might not
We should use the time in front of us to develop the new technologies as much as possible
Act together as a group working towards an experiment
Minimize pain and disappointment when choices will actually be made by the SuperB collaboration
May 10, 2007
F.Forti - Detector WG Summary

21. F.Forti - Detector WG Summary
Software
Simulation
We need to ramp up our simulation ability
More and more detailed
Connection with physics group and accelerator design
Physics studies
Background simulation
Detector studies
Infrastructure
We need to start setting up a software infrastructure (and group)
From repository to framework
We’ve been using SLAC/Babar so far. How much longer ?
May 10, 2007
F.Forti - Detector WG Summary

22. F.Forti - Detector WG Summary
Last but not least
Infrastructure in Tor Vergata
We need to proceed with a feasability study for the Tor Vergata site
It is essential to define building volumes and functions
Experimental hall(s), support buildings and caverns, shafts, assembly halls, …
We have regular meetings with the Tor Vergata engineers and architects
Need input and answers from the Accelerator and Detector group
May 10, 2007
F.Forti - Detector WG Summary

23. F.Forti - Detector WG Summary
Conclusion
Detector group very active
But a lot ground to be covered
Essential to
Keep going
Allow new forces to join
May 10, 2007
F.Forti - Detector WG Summary

24. Detector Layout – Reuse parts of Babar (or Belle)
BASELINE
OPTION
May 10, 2007
F.Forti - Detector WG Summary