1. LBNO Near detector task force LAGUNA-LBNO FP7 WP 4.7 Plenary meeting Hamburg 26-02-2013

2. Near detector design -- status Had two ‘plenary phone meetings (5/12/2012 and 12/02/2013) since last LBNO general + software and design meeting regularly See Indico

4. What is the near detector supposed to do? 0. assure global normalization of the experiment from event numbers in ND predict unoscillated event numbers in FD. 1.Measure cross-sections for signals   , (CC and NC) e and  e normalization channels as function of neutrino energy. 2. Magnetic detector necessary especially for anti-neutrino exposure 3. Energy resolution should be as good as in far detector  good containment of evts: 50/70tons of scintillator/Larg 4. Also need hadro production experiment, description of NA61/SHINE acceptance for that beam is given in EOI

5. Global set up and some numbers Underground (100m), located at 500m from target 850 Event rates are very large. At 500m location estimate ~0.6 events per pulse per ton for 750kW, 2 pulses every 6s. This needs to be verified with proper flux files 1kton magnetized iron (MINOS ND)  200 events per pulse of 10  s 1 evt / 50ns. pile-up Even with 100ton scintillator this is not trivial and probably precludes liquid Argon. Liquid Argon also ruled out because of neeed to measure sign of 5 GeV electrons. 0.2

6. Philippe Velten, Marco Calviani EN/STI/EET

7. Communication with P. Verlen established, spectra available

9.  =5000 Choice of pessure vessel around the scintillator based calorimeter motivated by 1.Integration without large amount of material between TPC and calorimeter 2.TPC inside its own vessel but now low pressure differential (easier, thin) 3.Magnetic field required is not very high 4. Difficulty and cost likely to be in the large 5 m diam. flange

10. Marco Zito had a first look at a 10 Bar TPC based on excellent performance of T2K ND280 TPC

11. TPC is detector of choice for PID by dE/dx – with sign determination.

13. Assume 0.4 T

14. curioni

15. Next steps: -- investigate pressure vessel -- and magnet design, fix B, -- need good homogeneity  coil geometry likely to be similar to that of UA1/NOMAD magnet! Giudici

17. Near Detector Facility: EHN1 extension 3 detectors with space for a 4th CENF – 25 February 201317

18. There is an opportunity for us, what role do we want in this? Will discuss further tomorrow, input welcome