1. Detector Status Francesco Forti, INFN and University, Pisa
SuperB Meeting, La Biodola, May 31, 2008

2. F.Forti - Detector Status
SuperB Detector
Babar and Belle designs have proven to be very effective for B-Factory physics
Follow the same ideas for SuperB detector
A SuperB detector is possible with today’s technology. Main issues:
Machine backgrounds – somewhat larger than in Babar/Belle
Beam energy asymmetry – a bit smaller
Strong interaction with machine design
Try to reuse parts of Babar as much as possible
Quartz bars of the DIRC
Barrel EMC CsI(Tl) crystal and mechanical structure
Superconducting coil and flux return yoke.
Moderate R&D and engineering required
Small beam pipe technology
Thin silicon pixel detector for first layer
Drift chamber CF mechanical structure, gas and cell size
Photon detection for DIRC quartz bars
Forward PID system (TOF or focusing RICH)
Forward calorimeter crystals (LSO)
Minos-style scintillator for Instrumented flux return
Electronics and trigger
Computing – large data amount
May 31, 2008
F.Forti - Detector Status

3. Detector Layout – Reuse parts of Babar
BASELINE
OPTION
May 31, 2008
F.Forti - Detector Status

4. F.Forti - Detector Status
Detector R&D Progress
Test beam goals for
Silicon Vertex Tracker
MAPS pixel devices: resolution, efficiency, readout speed
Advanced trigger systems (Associative Memories)
Drift Chamber
Cell size, shape, and gas mixture
Particle ID system (forward system)
Radiators (Aerogel, NaF)
Photon detector (MCP, MAPMTs, SiPM)
Timing for TOF system
Electromagnetic Calorimeter
Forw: LYSO Crystals leakage, resolution, mechanical structure
Back: Lead-scintillator calorimeter resolution
Instrumented Flux Return
Scintillator, fibers, photon detector, readout electronics
Detection efficiency, time/space resolution
Integrated slice
Track trigger, material in front of EMC, timing for TOF, forward PID options
Lots of progress
R&D technical progress in all detector subsystems
Started the definition of strategies for Electronics and DAQ design
Large computing effort for simulation
Subdetector groups are building up  collaboration
SuperB is included in the DevDet FP7 proposal
Improve infrastructure for detector R&D
Mainly focused on improving LNF Beam test facility
Electronics and software network
May 31, 2008
F.Forti - Detector Status

5. F.Forti - Detector Status
Subsystems update
significant R&D technical achievements and development
situation of the groups working in the system and what are the main uncovered areas
perspective for the TDR:
what decisions need to be taken and
what is the timeline for taking them; what R&D needs to happen
how much additional effort is needed
in many cases answers will come during the workshop
May 31, 2008
F.Forti - Detector Status

6. Progress in simulation
Development of both fast (parametrized) and full (Geant4) simulation programs started.
Geant4 Model (cylindrical)
Reuse Babar code where possible
Remove dependencies from private Babar code to allow redistribution to outside Babar
Principle approved by Babar council – work on technical issues ongoing
Use more modern approach to geometry description (GDML, developed for LHC)
Fast simulation targeted at physics benchmarking
Geant4 simulation targeted at backgrounds
E. Paoloni, M.Rama
May 31, 2008
F.Forti - Detector Status

7. Achievements
Simulation code able to read a GDML description of the SuperDet. GDMLs written for:
the CDR cylindrical detector used for Bkg Studies
a 0.0 version of the TDR SuperDet
Full simulation of backgrounds events on the 0.0 SuperDet
SuperB Geant4 simulation code put on a “Collaboration Wide” repository. Geant4 & GDML libraries easily available as RPM packages (Roberto Stroili)
Wiki page for the documentation ( Alberto Gianoli )
BaBar geometry saved in GDML and reused wherever reasonable/useful
State of the art description of the barrel EMC and of the layers 1-5 of the SVT
Iron/brass plates of the IFR
Rework of the simulation code to cope with flexible definitions of volumes with magnetic fields,sensitive detectors, segmentation... reasonable for SuperDet 0.0 but stil far from being satisfactory: lot of work to do

8. TDR SuperDet release 0.0 BaBar CsI barrel Beam lines G. Marchiori
BaBar SVT+ Layer0
Eugenio, Giovanni
LSO endcap
Stefano, Claudia
DCH
Matteo
IFR Gigi, Marcello

9. Goals for this meeting Decide how to validate the present simulation
Fix a 0.0 ver. of the sub-detectors volumes envelopes
Sketch of the requirements/strategies for the digitization of the Geant4 hits (i.e. inside/outside the Geant4 sim., inside/outside the Geant4 framework)
Review of the procedures to estimate the background impact on the detectors performances and life span
PID man power quest: we have the DIRC GDML description, but no one in charge to analyze at the simulation outcomes, to describe the forward endcap detector.

10. Fast Simulation The group has increased significantly:
714 people since February. Aim to involve still more people.
The intermediate deadlines before Elba were met:
Release of PravdaMC user guide on wiki.
Investigation of use of CEPack for Trackerr replacement. Outcome:
CEPack was abandoned. A new tracking code (PacTrk) is being developed.
Main development areas in the past 3 months:
New tracking engine
Response of DIRC, EMC and IFR
Interface between parts
Main goals for the Elba workshop
global review of the development status
consolidate liaison with physics groups and plan joint activity
plan of June activity in view of the first release of the code to the Users

11. Background simulation
Lattice “MAD” decks can be transformed into G4 geometry
Machine elements and apertures are then introduced into the full simulation for evaluation of backgrounds
Touchek background simulation is benchmarked with Dafne results
Good agreement
Optimization of collimators is needed after each lattice adjustement
Background rate in the KLOE forward calorimeter vs. position of the internal jaw of a collimator
May 31, 2008
F.Forti - Detector Status

12. SVT Main activities in the last year
G. Rizzo
Basic CMOS MAPS R&D (most challenging option for the Layer0):
Optimization of the Deep NWell MAPS pixel
S/N up to 25 with power consumption reduced (~30 uW/ch)
Fast redout architecture (sparsification and timestamp) implemented in a 4k pixel matrix. Preliminary test encouraging. Good sensitivity to e- from Sr90 and to g from Fe55 source
90Sr electrons
Landau mV
S/N=23
Cluster signal (mV)
Noise events
APSEL4D - Fe55
5.9 keV calibration peak
APSEL4D – Sr90 test
Fired pixel map with ½ MIP
Good uniformity (the source was positioned on the left side of the matrix
APSEL4D - 32x128 pixels 50 mm pixel pitch
May 31, 2008G. Rizzo
F.Forti - Detector StatusMay

13. F.Forti - Detector StatusMay-31-2008
Design of a pixel module with integrated cooling and low material (< 1% X0)
Crucial for a low material Layer 0 design with MAPS /Hybrid Pixel options
Development of support structures with cooling microchannel integrated in the Carbon Fiber/Ceramics support
Testbeam preparation (Sept. Main goals:
DNW MAPS matrix resolution & efficiency
Thin (200 um) striplets module with FSSR2 readout chips (baseline option in the CDR)
Demostrate LV1 copability with tracker information sent to Associative Memories
New DAQ system developed for data push architecture
beam
T-1,2,3,4 :reference telescope modules
DSSD 300 mm thick, 2x2 cm2
50 mm r.o. pitch (3 chip FSSR2/side)
S-1,2,3
scintillator
Striplets-1,2:
(1.29x7.0 cm2 )
DSSD 200 mm thick (45o)
25 p-side, 50 n-side mm pitch
50 mm r.o. pitch
(chip FSSR2)
MAPS-1,2 : MAPS (several mm2)
50x50 mm2 (5080 mm-thick) S1 S2 S3
T-2,1
T-4,3
Striplets-1
Striplets-2
MAPS-1
MAPS-2
May 31, 2008G. Rizzo
F.Forti - Detector StatusMay

14. F.Forti - Detector StatusMay-31-2008
Man Power for SVT
Italian Institutes already involved in basic R&D on MAPS (SLIM5 Collaboration ~ 13 FTE) confirmed their interest for the SuperB project:
Other groups (Roma III, Perugia), already active in MAPS R&D for ILC, expressed their interest for our activities (important synergy to exploit)
…but a significant amount of work is needed to turn the SVT CDR concept into a full detector design and write a Technical Design Report.
There is a lot of room for groups willing to join the effort!
Details in the next slide
Pisa
MAPS development
Light Mechanics with integrated cooling
Testbeam organization
LV1 trigger with Associative Memories
Pavia/Bergamo
Front-end for MAPS & striplets
Torino
Mechanics
Trieste
Striplets (Sensor-FSSR2 hybrids-interconnections-beam telescope)
Bologna
DAQ for testbeam, MAPS readout architecture
Milano (just joined the SVT SuperB effort)
MAPS cell & module development. Light mechanics.
May 31, 2008G. Rizzo
F.Forti - Detector StatusMay

15. SVT Activities from CDR to TDR
Although very promising the MAPS technology might need more time to become mature for application in SuperB. On the timescale of the TDR the situation will be clearer…
For the TDR we need to have a Layer0 design based on Hybrid Pixels: a mature and viable option that anyway requires some R&D to reduce the pitch and material budget to reach the SuperB requirements.
Activities already started (could benefit from more manpower):
Background studies to optimize detector space-time granularity and verify radiation levels (PI)
Physics studies to optimize Layer0 and overall detector geometry and granularity(PI)
Strong ongoing R&D on technology development for the most challenging Layer 0 option: CMOS MAPS pixel. (BO,PI,PV,BG,TO,TS, + MI ...)
Activities not yet covered that need to start soon:
Hybrid Pixel Option: need to investigate possible material/pitch reduction w.r.t.LHC experiments
Data transmission and DAQ
Design of the Layers 1-5: investigate existing front-end chip, module design
Integration Issues
May 31, 2008G. Rizzo
F.Forti - Detector StatusMay

16. F.Forti - Detector Status
Drift Chamber
G. Finocchiaro
Build on BABAR drift chamber concept: no major R&D effort needed, but:
Lighter structure, all in Carbon Fiber (CF)
Preliminary studies show dome-shaped CF end-plates with X0 ~2% seem achievable (compare 13-26% in BABAR DCH)
Design faster, lighter electronics (possibly taking into account detectors being considered now to be installed behind backward end-plates)
To control expected increase in occupancy:
studying faster gas mixtures
considering smaller cells
optimization studies need simulation tools being made available on Summer '08 meeting timescale
Tapered shape of end-plates
alternative solutions being presented at this meeting
Eventually, need to test all new solutions on small prototypes
May 31, 2008
F.Forti - Detector Status

17. F.Forti - Detector Status
Drift Chamber
Achievements:
In last months, preparation work for tests with drift chamber prototypes was done
External tracking telescope made available
Extrapolated accuracy O(100micron)
Readout electronics (on-board discriminators) being designed now
Mechanical structure and electronics of small drift chamber prototype ready (from KLOE)
Groups involved:
The BABAR LNF group as of now
Electronics engineers (2, part-time) expressed interest starting from 2009
May 31, 2008
F.Forti - Detector Status

18. F.Forti - Detector Status
Drift Chamber
Perspective for TDR: decisions to be taken
New cell structure
attack this problem with newly available simulation tools (next months)
test new cell and gas mixtures with prototypes (~1 year from now)
Define mechanical structure
simulation
Interplay with other detectors (length, offset, shape)
Once geometry outlined, make detailed FEA calculations
Electronics design
Actual work starting next year
Understand requirements meanwhile
Expect fruitful discussion at this meeting
SMALL GROUP – NEED TO GROW
May 31, 2008
F.Forti - Detector Status

19. F.Forti - Detector Status
PID
D. Leith
Main issues:
replacement of readout for barrel DIRC
forward PID system: if, and what.
Progress in many areas:
Time of flight
Aerogel
Electronics design
Who:
SLAC, BINP , Cincinnati , Ljubljana , Padua , Hawaii
System with large overlap with Belle – need to be resolved some time
More groups are needed
May 31, 2008
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20. F.Forti - Detector Status
PID TDR path
Forward PID ?
Physics case
Effect on other systems
If yes, what technology ?
TOF, Focusing Aerogel
Design of system
Technical work on detectors
Beam tests
engineering
Barrel changes from Babar
Small SOB choice
Optical coupling of bars to photo-detector
Wedge or no wedge ?
Choice of photodetector
Prototyping and beam tests
Engineering
Disassembly, transport, reinstallation and commissionin
Lots of engineering
Sotware, Electronics
May 31, 2008
F.Forti - Detector Status

21. F.Forti - Detector Status
Electromagnetic calorimeter
D. Hitlin
The BABAR CsI(Tl) barrel calorimeter, should, with minor modifications, be an adequate device for SuperB
Add two or three rings of crystals to extend rear coverage
Shorten effective integration time of the digital filter
Effect of lack of projectivity due to displacement of the IP is an issue for study
Most effort has gone into identifying appropriate technology for the front and rear endcaps. Leading candidates:
Front endcap: LYSO with APD readout
Rear endcap (primarily a missing energy veto): Lead (0.5 X0) with scintillating tiles and fiber + SiPM readout
Monte Carlo studies for design of forward endcap are well-advanced
Confronting design concepts with physics benchmarks is next
Bergen, Caltech, Edinburgh, McGill, Perugia, QMC (U of London)
May 31, 2008
F.Forti - Detector Status 21

22. F.Forti - Detector Status
Forward Endcap
Geometry
Front crystal face in the range of one Molière radius: ~25mm
Constraint: maximize crystal yield/boule
Beam test provides focus
Optimize crystal quality
Ascertain mechanical properties of LYSO
Devise readout and electronics chain
Calibration and system issues
Monte Carlo and analysis tools
May 31, 2008
F.Forti - Detector Status 22

23. F.Forti - Detector Status
Rear Endcap
Many of the main physics objectives of SuperB use missing energy signatures
Improving backward calorimeter coverage, and thus overall hermeticity, can pay large dividends in signal/background
Only modest energy resolution is required
The drift chamber electronics and DIRC tunnel provide severe constraints
A scintillating tile design provides adequate flexibility ~10K SiPM channels
BKGD/Signal
with smearing
Backward polar angle coverage (radians)
Btn
M. Mazur
May 31, 2008
F.Forti - Detector Status 23 23

24. SuperB-IFR: detection efficiency
R. Calabrese
Present baseline configuration:
scintillator: 1.5cm thick with
embedded hole
Fiber: One Saint-Gobain BCF- 92
1.0 mm diameter
Readout: Geiger mode APDs from
Hamamatsu and IRST-FBK
adc channels
1 p.e.
2 p.e.
pedestal
ADC spectrum for MPPC fiber 350 cm long
1.5 p.e. Cut
Average number of p.e.: ~ 9 at
maximum distance (~4m)
Efficiency better that 95%
Distance from photodetector (cm)
Average number of phe
Fiber Kuraray T ppm shows
higher light yield but slower time
response
Tests on scintillator with surface
groove instead of embedded hole are
under way
May 31, 2008
F.Forti - Detector Status

25. SuperB-IFR: time resolution
1.5cm thick scintillator + Saint-Gobain BCF- 92 fiber 1.0 mm diameter
counts
Distance ~200 cm
sigma 1.3 ns
sigma 1.8 ns
MPPC
SiPM
The trigger scintillator is 15cm long so we expect a contribution of about 0.8ns due to that
The time resolution is < 2 ns and is better with SiPM (IRST- FBK) than with MPPC (Hamamatsu)
Time resolution studies are under way: - kuraray vs Saint-Gobain fibers
- precise study of SiPM time response
- use of a fast discriminator board
May 31, 2008
F.Forti - Detector Status

26. SuperB IFR group institutions and activities
At present:
Ferrara INFN-University
Padova INFN-University
Roma1 INFN-University
Additional forces would be very helpful, in particular in the area of simulation
For the TDR:
Establish the baseline layout of the detector (R&D on scintillator, fiber, SiPM, electronics,…+ simulations)
Build and test a prototype (end 2009/beginning 2010)
To build, install and operate the final detector need more institutions
May 31, 2008
F.Forti - Detector Status

27. Trigger/DAQ/Electronics
D. Breton
G. Dubois-Felsmann
Fast Control and Timing System (FCTS) protocol proposal put forward. Two options:
BaBar-like fixed-latency model
Variable latency with addressing by time, and queueing of triggers
Subsystems need to understand (basically now) what their data volume is going to be
Number of bits, Readout rate, Event size
 Understand if it fits in the 100KHz, 1% deadtime requirement
A change in model can be very costly
Both in euros and in people
Need to start looking at electronics issues
Uniform design and common architecture across systems
Radiation hardness
Very thin on manpower
May 31, 2008
F.Forti - Detector Status

28. F.Forti - Detector Status
Workshop goals
Clarify path towards the Technical Design Report
Define R&D program
Bring more people on board
Subsystem conveners
MDI/Backgrounds – Paoloni/Biagini
SVT – Rizzo
DCH – Finocchiaro
PID – Leith
EMC – Hitlin
IFR – Calabrese
Electronics/Trigger/DAQ – Breton/Dubois-Felsmann
Computing – Morandin
Rough institutional roll call today
Now’s the time to say: “Me, too !”
May 31, 2008
F.Forti - Detector Status

29. F.Forti - Detector Status
Workshop map
May 31, 2008
F.Forti - Detector Status

30. BACKUP

31. Accelerator and site costs
Note: site cost estimate not as detailed as other estimates.
May 31, 2008
F.Forti - Detector Status

32. F.Forti - Detector Status
Detector cost
Note: options in italics are not summed. We chose to sum the options we
considered most likely/necessary.
May 31, 2008
F.Forti - Detector Status

33. F.Forti - Detector Status
Schedule
Overall schedule dominated by:
Site construction
PEP-II/Babar disassembly, transport, and reassembly
We consider possible to reach the commissioning phase after 5 years from T0.
May 31, 2008
F.Forti - Detector Status