1. The NO A Near Detector: An overview Jose A. Sepulveda-Quiroz For the NO A Collaboration Iowa State University and Argonne National Laboratory APS April Meeting April 11, 2015

2. NO A Overview 24/11/2015Jose Sepulveda, APS DPF Baltimore NOνA Far Detector 810km MINOS Far Detector 735km NO A portfolio: – Oscillation channels: (prev talk) (next talk) – Exotics, Supernovas, cross sections. Physics goals: – Precise measurements:  13,  23,  m  32 – Chance to: resolve mass hierarchy, resolve octant, measure  CP NuMI: power upgraded (700 kW in 2016), high intensity beam at FNAL. Two detectors: low Z, liquid scintillator tracking calorimeters off the main axis of the beam.

3. About the Near Detector 34/11/2015Jose Sepulveda, APS DPF Baltimore Operating since August 2014. Location: 105 m underground and 1 km from production target (FNAL). Physics goals: – Characterize unoscillated beam in order to predict energy spectrum at Far Det. – Cross sections, sterile neutrinos. beam noise hits beam hits Near Detector : 5 ns time resolution beam structure

4. About the Near Detector 44/11/2015Jose Sepulveda, APS DPF Baltimore Near Detector: Reconstructed Energy Spectrum by MC components. Signal is  CC by truth. Far Detector: Reconstructed Energy Spectrum. Signal is  CC by truth.

5. About the Near Detector 54/11/2015Jose Sepulveda, APS DPF Baltimore Avalanche Photodiodes (APDs): – Small silicon crystal – QE (525 nm, -15  C): 85% Front-End-Boards (FEBs) – Low noise-signal amplification, pulse shaping and timestamp – Thermoelectric Cooler Controller.

6. 4/11/2015Jose Sepulveda, APS DPF Baltimore6 NuMI Neutrino Events in Near Detector Neutrinos at the Main Injector (NuMI) event – full trigger of 550 us. Beam is coming from the left. Upper image represents aerial (XZ)-view. Lower image represents lateral (YZ)- view. The color of each hit represents time it got recorded. NOvA Preliminary Beam direction

7. 4/11/2015Jose Sepulveda, APS DPF Baltimore7 NuMI Neutrino Events in Near Detector Neutrinos at the Main Injector (NuMI) event – zoom in beam (217-229 us). Beam is coming from the left. Upper image represents aerial (XZ)- view. Lower image represents lateral (YZ)-view. The color of each hit represents time it got recorded. NOvA Preliminary Beam direction

8. 4/11/2015Jose Sepulveda, APS DPF Baltimore8 NuMI Neutrino Events in Near Detector Neutrinos at the Main Injector (NuMI) event – zoom in event (223-225 us). Beam is coming from the left. Upper image represents aerial (XZ)- view. Lower image represents lateral (YZ)-view. The color of each hit represents time it got recorded. NOvA Preliminary Beam direction

9. 4/11/2015Jose Sepulveda, APS DPF Baltimore9 NuMI Neutrino Events in Near Detector Neutrinos at the Main Injector (NuMI) event – zoom in event (223-225 us). Beam is coming from the left. Upper image represents aerial (XZ)- view. Lower image represents lateral (YZ)-view. The color of each hit represents its charge. NOvA Preliminary Beam direction

10. 4/11/2015Jose Sepulveda, APS DPF Baltimore10 NuMI Neutrino Events in Near Detector Neutrinos at the Main Injector (NuMI) event – zoom in event (226-227 us). Beam is coming from the left. Upper image represents aerial (XZ)-view. Lower image represents lateral (YZ)-view. The color of each hit represents time it got recorded. NOvA Preliminary Beam direction

11. 4/11/2015Jose Sepulveda, APS DPF Baltimore11 NuMI Neutrino Events in Near Detector Neutrinos at the Main Injector (NuMI) event – zoom in event (226-227 us). Beam is coming from the left. Upper image represents aerial (XZ)-view. Lower image represents lateral (YZ)-view. The color of each hit represents time it got recorded. NOvA Preliminary Beam direction

12. 4/11/2015Jose Sepulveda, APS DPF Baltimore12 Near Detector Performance Number of reconstructed tracks on the left. Track length distribution of the longest track in event (right). Non-tuned simulation (Genie + GEANT) Flux uncertainties ~ 20% and about 19 days of data.

13. 4/11/2015Jose Sepulveda, APS DPF Baltimore13 Near Detector Performance Direction cosine on Z-axis for selected track (left). Reconstructed muon energy using track information (right).

14. Near Detector Performance 4/11/2015Jose Sepulveda, APS DPF Baltimore14 Start and stop X-projections of longest reconstructed tracks.

15. Near Detector Performance 4/11/2015Jose Sepulveda, APS DPF Baltimore15 Start and stop Y-projections of longest reconstructed tracks.

16. Near Detector Performance 4/11/2015Jose Sepulveda, APS DPF Baltimore16 Start and stop Z-projections of longest reconstructed tracks.

17. Conclusions The NO A Experiment has been collecting data and soon will present results. The Near Detector characterizes the   and e  energy spectra for the oscillation measurements. Reasonable agreement between data and simulation. 4/11/2015Jose Sepulveda, APS DPF Baltimore17 NO A at APS:  e appearance analysis, E. Niner (prev talk)   disappearance analysis, M. Baird (next talk)  Atmospheric showers, M. Sultana (poster session I, today)  Cosmic muon removal, N. Yadav (Sunday)  Neutral current pions, H. Sahoo (Sunday)  Beam simulation, K. Maan (Monday)  Hidden sector searches, A.Hatzikoutelis (Monday) 180+ scientists, engineers and students From 35 institutions from 7 countries.

18. BACK UP 4/11/2015Jose Sepulveda, APS DPF Baltimore18

19. 194/11/2015Jose Sepulveda, APS DPF Baltimore Neutrino Events

20. The Detectors 204/11/2015Jose Sepulveda, APS DPF Baltimore 15.5m 6.6cm 3.9cm Particle Trajectory Scintillation Light Wavelength shifting Fiber Loop To APD Readout Fiber pairs from 32 cells 32-pixel APD Technology: – PVC cells filled with scintillator oil. – Each cell contains a wavelength shifting fiber. – A module (32 cells) is read by one Avalanche photodiode (APD).

21. 214/11/2015Jose Sepulveda, APS DPF Baltimore beam

22. Near Detector Performance 4/11/2015Jose Sepulveda, APS DPF Baltimore22 Directive cosine on X and Y axis respectively for selected tracks.

23. 4/11/2015Jose Sepulveda, APS DPF Baltimore23 Near Detector Performance Number of hits in longest reconstructed track, both views (left). Number of hits in muon-like reconstructed track, both views (right).

24. 4/11/2015Jose Sepulveda, APS DPF Baltimore24 Details Near Detector Starts running The exposure is equivalent to 1.9e20 POT of a fully instrumented Far Detector.

25. Details 4/11/2015Jose Sepulveda, APS DPF Baltimore25 The significance at which we could discover CP violation, as a function of the true value of delta. For every point on each curve, take the chisq at delta=0 and delta=pi in both hierarchies. Quote the square root of the smallest. The significance at which we would resolve the hierarchy, as a function of the true value of delta. For every point on each curve, assume the wrong hierarchy and scan across delta to find the best fit. Quote sqrt(delta chisq).

26. 4/11/2015Jose Sepulveda, APS DPF Baltimore26 APD Detected Spectra Leon Mualem, Caltech

27. 4/11/2015Jose Sepulveda, APS DPF Baltimore27 APD Photodetector Manufacturer Pixel Active Area1.95 mm × 1.0 mm Pixel Pitch2.65 mm Array Size32 pixels Die Size15.34mm × 13.64mm Quantum Efficiency (>525 nm)85% Pixel Capacitance10 pF Bulk Dark Current (I B ) at 25 C12.5 pA Bulk Dark Current (I B ) at -15 C0.25 pA Peak Sensitivity600 nm Operating Voltage375 ± 50 volts Gain at Operating Voltage100 Operating Temperature (with Thermo-Electric Cooler) -15 º C Expected Signal-to-Noise Ratio (Muon at Far End of Cell) 10:1 APD channels per plane384 APD arrays per plane12 Total number of planes930 Total Number of APD arrays11,160 APD pixels total357,120 Leon Mualem, Caltech

28. 4/11/2015Jose Sepulveda, APS DPF Baltimore28 FEB and APD Assembly Snout Electronics Box bottom TECC Electronics Box cover Leon Mualem, Caltech