Roberto Calabrese Ferrara University and INFN IFR status and outlook Roberto Calabrese Ferrara University and INFN SuperB Workshop, Perugia June 16-19, 2009

Outline Introduction Progress since Orsay Future activities towards TDR Milestones I will briefly present the general ideas of our experiment: How it is possible to trap atoms using light force and magnetic field Some words on Parity Non Conservation on Atoms (this is a field You know better than me…) I will give then some details on the Fr element ; why it is suitable to perform PNC measurements Then I will show the experimental setup (not yet complete!)

The IFR for Super B The muon detector is build in the magnet flux return. It will be composed by one hexagonal barrel and 2 endcaps like in Babar. Possibility to reuse BaBar iron structure Scintillation bars with WLS fiber to sustain rates O(100 Hz/cm2)

IFR requirements for Super B Add iron to BaBar stack to improve m ID:  8 detection layers should be enough Keep longitudinal segmentation in front of stack to retain KL ID capability. The CDR layer configuration Need to optimize: Scintillation bars geometry Number of active layers Where and how much iron we need to add

The CDR style IFR This technology was proposed also as replacement of the BaBar barrel. One coordinate is measured by the position of the scintillation bar. The other coordinate by measuring the time at both end of the bar. Need input from simulation and background evaluation. Time resolution and spatial segmentation Number and location of active layers. Need full simulation of the detector, reconstruction code and muon selectors. From CDR: possible 4 fibers readout

Evolution from CDR Some of the questions that we need to answer for TDR Number of fibers per scintillation bar WLS fiber diameter (1 mm), shape decay time, … Use Geiger Mode APDs instead of APDs What is the best mechanical design What electronics Read one or two side of the scintillator ?  ?   ?   ?   ?  ? ?

The scintillator bars In contact with FNAL-NICADD facility Various candidates: We have some spares from Minos and Itasca company that we are using for R&D

From Orsay to Perugia and beyond End of Orsay meeting R&D needs evaluate different readout options evaluate the possibility to bring the photon-detectors out of the iron impact of neutron background on SiPM Iron Structure: new structure vs partial recycle of BaBar iron (or total recycle) impact on the budget impact on the performances Now studies in progress + simulation needed studies completed (will be reported in this meeting) preliminary tests done first cost evaluation waiting for the simulation

Different readout options: 1st option: measure both coordinates with one scintillation bar (position + time). This is the baseline for the barrel. 1st option As 2-nd option we are considering the “double coord layout”: orthogonal scintillator bars, 1cm thick (mechanically rather complicated for the barrel) 2nd option Sketch of the two readout options

Light loss in the CLEAR fiber WLS and clear fiber are coupled mechanically, no splicing We expect roughly a 10% coupling loss L= 10m, att length l = 10m Aexp = Acoupl e-l/L ~ 0.9 * 0.37 ~ 0.33 Ameas=146/446 = 0.33 This confirm our estimate for the fibers coupling loss After 10m of 1.5 mm clear fiber No clear fiber <Q> = 146 ch <Q> = 446 ch ADC ch

1 vs 2 vs 3 kuraray fibers at the close end (CLOSE end: ~0 1 vs 2 vs 3 kuraray fibers at the close end (CLOSE end: ~0.3m from scintillator) 1 fiber R2/1 = 1.46 R3/1 = 1.65 ADC ch With 3 fibers we gain only 13% more signal wrt 2 fiber case 2 fibers 3 fibers

From Orsay to Perugia and beyond

SiPM currents and dark rates

If preliminary results will be confirmed SiPM can be damaged with a dose of 109 n/cm2 Need for accelerator background simulations + study on neutron shielding

From Orsay to Perugia and beyond

Flux return - - - - CDR baseline = 920 mm Babar IFR thickness: Barrel = 650 mm Doors = 600 mm Some parts of Babar have been thickness increased with brass and steel plates Current thicknesses (equivalent): Barrel ~ 795 mm but last instrumented layer see 695 mm FW doors ~ 835 mm BW doors = 600 mm - - Babar IFR with brass filling: Barrel maximum thickness ~ 868 mm but last instrumented layer see ~ 768 mm FW doors maximum thickness ~ 1000 mm BW doors maximum thickness ~ 900 mm Which solution? Scenarios: Doors: brass filling + 100mm steel, refurbish BW doors as FW ones (up to 920 mm) Barrel: brass filling + modify arches and cradle to allow outer scint. layer ~ 868 mm Add 100mm plate outisde + new arches and cradle + 1 layer brass ~ 915 mm Replace inner wedges + modify cradle and arches = 920 mm CDR baseline = 920 mm -

Flux return cost evaluation Mass Cost Current IFR (wedges + doors + cradle + arcs): 790 t (0.4 M€ transportation cost) Different scenarios Brass filling, 868 mm, arches and cradle modified 900 t 1.3 M€ Brass + steel up to 920 mm doors and barrel 955 t 1.4 M€ New inner wedges, no brass 925 t 2.1 M€ Fully new IFR, max. thickness 1030 t 3.5 M€ (950mm barrel, 1100 mm doors)

From Orsay to Perugia and beyond

Digitizer + clusterizer

From Orsay to Perugia and beyond

From Orsay to Perugia and beyond

Prototype preparation layout based on: 5 layers of x-y scintillators, 1 cm thick, read in binary mode 3 layers of scintillators 2 cm thick, read in timing mode Design of the prototype has started and will be finalized based on R&D and simulation. Need to place the order for the scintillators by September: schedule for simulation is very tight. SCINTILLATORS/FIBERS IRON FRAME Electronics for the prototype is being designed to test different readout options. Cooling system and other infrastructures to be developed.

From Orsay to Perugia and beyond

Milestones toward the TDR order scintillators for prototype construction (needed simulation results) finalize prototype design (mechanics and electronics) and begin construction. begin prototype assembly prototype test with cosmics test beam write TDR September 09 Fall 2009 January 2010 Spring 2010 Summer 2010 Fall 2010 A lot of work to be done, but it seems we are on the right path