1. IFR Status Summary W. Baldini on behalf of the IFR Group
XXVII SuperB Workshop and Kick off Meeting La Biodola, Isola d’Elba May 28 - June

2. Overview Short introduction to the IFR
Activities related to the prototype:
Dec beam test data analysis and comparison with cosmic data taking in Ferrara
preparation of the next beam test (July 2011)
Mechanics of the detector and the flux return
Conclusions and next steps

3. IFR Baseline DetectionTechnique
Plan to re-use BaBar IFR structure, adding iron to improve μ-ID
Extruded Scintillator as active material to cope with higher flux of particles
Minos-like scintillator bars readout through 3 WLS fibers and Silicon Photo-Multipliers (SiPM)
82 or 92cm of Iron interleaved by 8-9 active layers (under study with simulations and testbeam)
Two readout options under study:
Time readout (TDC-RO) barrel
Binary readout (BI-RO) endcaps
These detection techniques are being tested on a full depth prototype, tested on beam in Dec and on the next test
foreseen July
Prototype
scintillator
bar + WLS fibers
SiPM

4. Test Beam at Fermilab Dec 1-7 2010 first data taking
The prototype (only active layers) has then been shipped back to Ferrara, reassembled and we are now taking cosmic data
Next beam data taking: July 20 – Aug
Fermilab Test Beam Facility (FTBF) in the Meson Area
Extracted beam from Main Injector
IFR detector prototype
beam
Cherenkov
S1, S2
18cm of Iron
S3, S4 (scintillators): all layers hit

5. Beam Test data analysis: detector performances
Efficiencies around 95% for both :
the OR of the two ends (TDC-RO)
the and of the two BIRO layers
Detection efficiency
Time resolution
Layer #
The time resolution is in agreement with what expected from first R&D results,
For layers with shorter fibers not yet completely understood (next testbeam…)

6. detector performances comparison beam-cosmic
Dead channels
Cosmic data in good agreement with testbeam data

7. detector performances: comparison beam-cosmic
Beam: muon + pions
Shower time evolution
Cosmics: only muons
Muons
pions
no pions
May 31st, 2011
SuperB Workshop and Kick Off Meeting 7

8. Temperature in Ferrara….
During the cosmic data taking temperature rised up to more than 32 in our lab…. no air conditioning yet (!!)
Part of the effect on SiPM due to rising of temperature can be recovered by rising the Vbias voltage
This increase the Dark Count rate
to work in safe conditions we will have to keep them in an environment where T< C°

9. Muon Identification
Number of hits/layer for events
tagged as muons and as pion:
Transverse cluster size vs layer #
The Cherenkov is not very efficient at low momentum (4GeV),
For the next test beam (July!) we will use a new gas (C4F8O) to improve the efficiency

10. Preparation for the next testbeam
The next testbeam will be from July 20 to Aug 3
Since the Dec. testbeam we have made many improvements,
and have understood many things
Exploit the previous experience to optimize the next data taking:
Cherenkov cables: prepare 75W  50W adapters
New Cherenkov gas
larger S3,S4 scintillator
Faster S1-S2 scintillator (or use the TOF)
Prepare a cooling system to keep temperature possibly below °C

11. Detector and Flux Return Mechanics

12. Mechanics of the Active Layers
endcap
Barrel
The mechanics of the active layers for the barrel and the endcaps is under definition
The active material has to be protected and light shielded, keeping a max thickness of ≈ 23mm
The SiPM have to be properly placed and shielded
The basic idea is to prepare an aluminum box (0.5mm aluminum foil) fix on it the scintillator bars (with fibers
already glued and polished)
Weight of a module 4m long and 10 scint. bars:
~ 40Kg, but not self sustaining
Proper moving/installation
tools have to be designed and
built
For BIRO readout the mechanics
is more complex but the basic idea
is the same
Routing of fibers and signal cables have to be carefully studied
Scintill. bars
Closed module

13. Mechanics of the Flux Return

14. Conclusions and next steps
Many activities ongoing
Beam and cosmic data show good performances of the prototype (eff ~ 95%, time resolution ≈ 1.2 ns)
More informations needed for low momentum muons, TDC performances, so we will take more data in July
New testbeam preparation
Study and definition of the mechanical structure of the active modules (both TDC and BIRO readout)
Definition of the structure for the flux return
Services and integration
After all activities ready for TDR
New groups from Krakow (AGH, CUT and INP-PAN) joined the IFR group, their contributions are being discussed

15. Backup slides

16. Readout Options
Time readout Option (TDC-RO): the hit bar gives the first coordinate while the signal arrival time provides the second
measure the 2 coordinate at the same time
1ns time resolution  ~ 20cm
need TDC readout for each channel
relatively simple to be constructed
res~20cm
Binary readout Option: (BI-RO): the two coordinates are given by two planes of orthogonal scintillator bars:
high combinatorial
simpler (and cheaper) electronics
more complex construction
Both option are being tested on beam thanks to a full depth prototype