1. Baby MIND Status on T9
E. Noah
6th July 2017

2. 8 readout electronics minicrates
44 Front End Boards
18 scintillator modules
33 magnet modules
75 tonnes
Magnet power supply rack
Timing Sync PC
DAQ PC

3. From interactions of neutrinos in target upstream
Interleaving of Magnet and Scintillator Modules
d: detector module (x 18 modules)
s: steel magnet module (x 33 modules) d0 d2 d4 d6 d8
d10
d12
d14
d16 d1 d3 d5 d7 d9
d11
d13
d15
d17
[s1-3]
[s4]
[s5]
[s6]
[s7-8]
[s9-10]
[s11-12]
[s13-15]
[s16-18]
[s19-21]
[s22-24]
[s25-27]
[s28-30]
[s31-33] 10
m+ & m-
From interactions of neutrinos in target upstream
2000
Gaps to improve angular resolution with “lever arm” 10
200
200
200
500
Thicker steel to better resolve angular deflection by B-field from angular deflection by M.S.
Thinner steel here to improve cross-calibration of detector:
i.e. momentum resolution by range vs B-field

4. Baby MIND Main Systems x 33 modules x 18 modules x 4 blocks
Novel magnet design
x 33 modules
Custom scintillator modules
x 18 modules
Support mechanics for transport to Japan
Cable bundles (scintillator-to-electronics)
Custom readout electronics (USB3)
x 4 blocks

5. Baby MIND Magnet modules
Novel design to address access, space and installation constraints in the pit at J-PARC. Each steel (ARMCO) module is wrapped in its own coil.
Modularity and flexibility allows for deployment in much wider range of detector topologies compared with conventional large scale designs such as CDHS or MINOS
Excellent B-field uniformity across the magnet module
Low stray fields
Low power dissipation
Changing magnet polarity
Dimensions: 3500 × 2000 × 30 mm3.
2 slits: 2800 mm, 10 mm wide.
Warm magnet: Aluminium coil: Fiber glass insulation sheath.
Custom “sewing” process for coil winding.
Power requirements are minimal:
A for 1.5 T
12 kW power for 33 magnet modules.

6. Baby MIND Magnet Assembly (completed February 2017)
B-field tests of complete modules
Welding of aluminium coil ends
Machined bare ARMCO
Coil assembly
2 assembly stands

7. Baby MIND Scintillator Modules
Scintillator bars from INR:
Polysterene based, 1.5 % PTP, 0.01% POPOP.
Reflective coating 30 to 100 mm from chemical etching of surface.
Kuraray WLS fiber (200 ppm, S-type), dia 1.0 mm.
Eljen EJ-500 optical cement.
Custom optical connector.
First batch delivered March Good for 2 modules.
Second batch delivered December 2016.
Photosensors:
Hamamatsu MPPC S C
1 x 1 mm2
Module mechanics: two half modules assembled separately.
Each half-module: one horizontal, one vertical plane.

8. Baby MIND Electronics Modules
Features of the custom Baby MIND Front End Board:
96 channels.
3 CITIROC ASICs 32-ch.
12-bits 8-ch 40MS/s/ch ADC.
Altera ARIA5 FPGA.
Timing: 2.5 ns sampling.
Analog readout: 96ch LGain and HGain.
HV, ASIC T + board T + RH%.
Readout/Slow control on USB3 and /or Gigabit RJ45 chain.
Externally propagated Trig/sync. signal.
Power supplies (HV/LV).
Front End Board block diagram
Baby MIND FEB v1

9. Detector installation and commissioning:
Brief status
Detector installation and commissioning:
Magnet tested Total power consumption is 11.5 kW
Detector cabling completed (28th June 2017)
All 3996 photosensors connected to readout electronics via 5m cable bundles. channels connected and tested (fingerplots from MPPC dark counts) All photosensors tested (3 unuseable channels)
Calibration done for all photosensors
Electronics integration and DAQ
All 8 Minicrates hosting 44 Front End Boards are synchronised
Working on new firmware for the Front End Boards to resolve occasional loss of data in one of the readout modes (TDM mode)
Finalising unpacking code for data
Analysis ongoing
General use at T9
We operate two shifts with 2 to 3 shifters per shift: 9am-7pm and 5pm-2am
New vista screen works

10. First event displays
Magnet in forward current mode
Magnet in reverse current mode
-3 GeV/c muon
-3 GeV/c muon
+3 GeV/c muon