Baby MIND is a magnetized iron neutrino detector, with novel design features,
and is planned to serve as a downstream magnetized muon spectrometer for the
WAGASCI experiment on the T2K neutrino beam line in Japan. One of the main
goals of this experiment is to reduce systematic uncertainties relevant to
CP-violation searches, by measuring the neutrino contamination in the
anti-neutrino beam mode of T2K. Baby MIND is currently being constructed at
CERN, and is planned to be operational in Japan in October 2017.Comment: Poster presented at NuPhys2016 (London, 12-14 December 2016). 4
  pages, LaTeX, 7 figure

Antonova, M.

Asfandiyarov, R.

Bayes, R

Benoit, P.

Blondel, A.

Bogomilov, M.

Bross, A.

Cadoux, F.

Cervera, A.

Chikuma, N.

Da Silva, H. Pais

Dudarev, A.

Ekelöf, T.

Favre, Y.

Fedotov, S.

Hallsjö, S-P.

Izmaylov, A.

Karadzhov, Y.

Kate, H. Ten

Khabibullin, M.

Khotyantsev, A.

Kleymenova, A.

Koga, T.

Kostin, A.

Kudenko, Y.

Likhacheva, V.

Martinez, B.

Matev, R.

Medvedeva, M.

Mefodiev, A.

Minamino, A.

Mineev, O.

Nessi, M.

Nicola, L.

Noah, E.

Ovsiannikova, T.

Parsa, S.

Rayner, M.

Rolando, G.

Shaykhiev, A

Simion, P.

Soler, F. J. P.

Suvorov, S.

Tsenov, R.

Vankova-Kirilova, G.

Yershov, N.

English

arXiv

Baby MIND is a magnetized iron neutrino detector, with novel design features,

and is planned to serve as a downstream magnetized muon spectrometer

for the WAGASCI experiment on the T2K neutrino beam line in Japan. One

of the main goals of this experiment is to reduce systematic uncertainties relevant

to CP-violation searches, by measuring the neutrino contamination in the

anti-neutrino beam mode of T2K. Baby MIND is currently being constructed

at CERN, and is planned to be operational in Japan in October 2017

Bayes, R.

Pais Da Silva, H.

Shaykhiev, A.

Soler, F.J.P.

Ten Kate, H.

Enlighten

      Antonova, M. et al. (2017) Baby MIND Experiment Construction Status. Prospects in Neutrino Physics (NuPhys2016), London, UK, 12-14 December 2016.     There may be differences between this version and the published version. You are advised to consult the publisher’s version if you wish to cite from it.    http://eprints.gla.ac.uk/145689/            Deposited on: 10 August 2017                       Enlighten – Research publications by members of the University of Glasgow http://eprints.gla.ac.uk NuPhys2016-ParsaMay 1, 2017Baby MIND Experiment Construction StatusM. Antonova1, R. Asfandiyarov2, R. Bayes3, P. Benoit4, A. Blondel2,M. Bogomilov5, A. Bross6, F. Cadoux2, A. Cervera7, N. Chikuma8,A. Dudarev4, T. Ekelo¨f9, Y. Favre2, S. Fedotov1, S-P. Hallsjo¨3, A. Izmaylov1, Y. Karadzhov2, M. Khabibullin1, A. Khotyantsev1, A. Kleymenova1,T. Koga8, A. Kostin1, Y. Kudenko1, V. Likhacheva1, B. Martinez2, R. Matev5,M. Medvedeva1, A. Mefodiev1, A. Minamino10, O. Mineev1, M. Nessi4,L. Nicola2, E. Noah2, T. Ovsiannikova1, H. Pais Da Silva4, S. Parsa2?,M. Rayner4, G. Rolando4, A. Shaykhiev1, P. Simion9 , F.J.P. Soler3,S. Suvorov1, R. Tsenov5, H. Ten Kate4, G. Vankova-Kirilova5 andN. Yershov1.1Institute of Nuclear Research, Russian Academy of Sciences, Moscow, Russia.2University of Geneva, Section de Physique, DPNC, Geneva, Switzerland.3University of Glasgow, School of Physics and Astronomy, Glasgow, UK.4European Organization for Nuclear Research, CERN, Geneva, Switzerland.5University of Sofia, Department of Physics, Sofia, Bulgaria.6Fermi National Accelerator Laboratory, Batavia, Illinois, USA.7IFIC (CSIC & University of Valencia), Valencia, Spain.8University of Tokyo, Tokyo, Japan.9University of Uppsala, Uppsala, Sweden.10Yokohama National University, Yokohama, Japan.Baby MIND is a magnetized iron neutrino detector, with novel design fea-tures, and is planned to serve as a downstream magnetized muon spectrometerfor the WAGASCI experiment on the T2K neutrino beam line in Japan. Oneof the main goals of this experiment is to reduce systematic uncertainties rele-vant to CP-violation searches, by measuring the neutrino contamination in theanti-neutrino beam mode of T2K. Baby MIND is currently being constructedat CERN, and is planned to be operational in Japan in October 2017.PRESENTED ATNuPhys2016, Prospects in Neutrino PhysicsBarbican Centre, London, UK, December 12–14, 2016?This project has received funding from the European Union’s Horizon 2020 Research and Inno-vation programme under grant agreement No. 654168.1 IntroductionThe Baby MIND experiment as the downstream MRD of the J-PARC T59 experiment(WAGASCI) [1], was approved by the CERN Research Board in December 2015 [2].The WAGASCI experiment, with a novel detector arragement which creates arraysof small cubic cells whose walls are made from plastic scintillators, provides betteracceptance compared to a classical layout of successive X and Y planes scintillatorbars. The adoption of WAGASCI units for upgrades to the T2K ND280 near detectoris being considered, motivated by the need to reduce systematics due to nuclear effectsin water, one of the dominant systematic uncertainties in the T2K neutrino oscillationanalyses, and of direct relevance to the HyperK project [3].One challenge to be addressed by the Baby MIND collaboration is that of obtaininghigh charge identification efficiencies for µ+ and µ− down to 400 MeV/c. Magnetizediron neutrino detectors are limited by multiple scattering in the iron, and their useis overlooked for applications requiring good charge ID efficiencies below 1 GeV/c.By optimising the distance between the first magnet modules, rendered possible bythe magnet design, our simulations show high charge identification efficiencies of 97%down to 500 MeV/c, and capabilities for charge identification down to 300 MeV/c.2 Baby MIND Detector designThe design and construction of the Baby MIND detector was very much constrainedby the need to operate the detector both at CERN and in Japan on a relatively shorttimescale, and also the installation limitations in Japan via a narrow shaft (Figure1),which in particular has driven the new magnetization scheme of the detector. BabyMIND is built from sheets of iron interleaved with detector modules as shown in Figure2, but unlike traditional layouts for magnetized iron neutrino detectors (e.g.MINOS)which tend to be monolithic blocks with a unique pitch between consecutive steelFigure 1: (Left) Sketch of WAGASCI detector, side MRDs and Baby MIND, (Right)Baby MIND installation in ND280 pit.1Figure 2: One possible Baby MIND layout, with muons incident from the left. Scintillatormodules are referenced d0 to d17, magnet modules are referenced s1 to s33.segments and large conductor coils threaded around the whole magnet volume, theBaby MIND iron segments are all individually magnetized, allowing for far greaterflexibility in the setting of the pitch between segments, and in the allowable geometriesthat these detectors can take. This is of relevance for neutrino experiments that mightconsider muon spectrometers based on magnetized iron surrounding an active detectorvolume such as plastic scintillator, water cherenkov, liquid argon.3 Detector hardware constructionThe different detector hardware components and systems are listed below:• Magnet module.• Scintillator detector module.• Cable bundles.• Front-end electronics module.• DAQ system.• Mechanics support systems.The general approach of the collaboration is to ensure documentation and trace-ability of components and systems. A construction database has been written to storeparameters relevant to the detector hardware such as detector geometrical configu-rations, serial numbers of components and test data. The majority of systems haveundergone prototype validation before launching the production phases. Assemblyand qualification procedures are drafted for each system. Integration procedures en-sure the correct handling of interfaces during systems integration phases.2Figure 3: (Left) The Magnet assembly zone, (Right) A scintillator module.3.1 Magnet modules statusThe magnetization scheme for Baby MIND was designed at CERN[4]. Construction of themagnet modules was completed there by February 2017. The magnet modules are madefrom ARMCO steel sheets with two horizontal slits machined in the center and are wrappedby aluminium coil in a sewing pattern, Figure 3. This design allows the magnetic flux to bevery uniform in the central tracking region, and contains the return flux in the side planes.The required horizontal magnetic field of 1.5 T can be reached for a current of 140 A anda dissipation power of 350 W per module.3.2 Scintillator modules statusThe scintillator modules with dimensions of 2 × 3 m2 contain 95 horizontal bars and 16vertical bars each. The bars are extruded scintillators with wavelength shifting fiber andcustom photosensor connectors manufactured under the responsibility of INR [5]. Onecompleted scintillator module is shown in Figure 3. A total of 18 standard detector moduleswill be used in Baby MIND final layout, interleaved with magnet modules. The final positionof these modules with respect to magnet modules is not frozen yet and is subject to changesdepending on different performance priorities. The production of all the units is scheduledto be finished for the end of April 2017.3.3 Electronics and DAQ systemThe Baby MIND electronic readout scheme has been published in ref [6]. The Front EndBoard for the experiment was developed by the University of Geneva based on the CITIROCASIC. The readout system includes two additional ancillary boards, the Backplane and theMaster Clock Board (MCB). The readout system architecture is shown in Figure 4. Afterthe extensive validation tests of the FEBv1 during beam tests at the T9 beamline at CERNwith 1 to 10 GeV/c muons in summer 2016, FEBv2 was developed, integrating layoutchanges dictated by cabling considerations and with additional features for daisy chainingand synchronisation of multiple boards. The DAQ PCs are connected by USB3 links to thefirst FEB in a group of 6 FEBs that are daisy chained using RJ45 links.3Figure 4: (Left) The electronic readout scheme, (Right) FEBv2.4 OutlookThe collaboration is currently focused on completion of the detector construction andpreparation for the upcoming beam tests at the T9 beamline at CERN in May andJune 2017. After full characterization, the detector will be shipped to Japan in July2017. The installation and commissioning of the detector in J-PARC will take placein September 2017 in order to be ready for beam at J-PARC in October 2017.References[1] E. Noah, “The WAGASCI experiment at J-PARC to measure neutrino cross-sectionson water, PoS EPS-HEP2015 (2015) 292.[2] M. Antonova et al., “Status report for the Neutrino Platform NP05 - Baby MIND -experiment” , CERN-SPSC-2017-015 , SPSC-SR-210, (2017).[3] K. Abe et al., “Physics potential of a long-baseline neutrino oscillation experimentusing a J-PARC neutrino beam and Hyper-Kamiokande”, PTEP 2015 (2015) 053C02,(arXiv:1502.05199 [hep-ex]).[4] G. Rolando et al., “New and Optimized Magnetization Scheme for the Baby Mag-netized Iron Neutrino Detector at J-PARC.”, IEEE Transactions on Magnetics, May2017, Volume 53, Issue 5.[5] A. Montanari et al., “Measurement of parameters of scintillating bars with wavelength-shifting fibres...”, JINST 12 (2017) no.03, P03005.[6] E. Noah et al., “Readout scheme for the Baby MIND detector”, PoS PhotoDet2015(2016) 031.4

Baby MIND Experiment Construction Status

Enlighten: Publications

  
 
 
 
 
Antonova, M. et al. (2017) Baby MIND Experiment Construction Status. Prospects in 
Neutrino Physics (NuPhys2016), London, UK, 12-14 December 2016. 
 
   
There may be differences between this version and the published version. You are 
advised to consult the publisher’s version if you wish to cite from it. 
 
 
 
http://eprints.gla.ac.uk/145689/ 
     
 
 
 
 
 
 
Deposited on: 10 August 2017 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Enlighten – Research publications by members of the University of Glasgow 
http://eprints.gla.ac.uk 
NuPhys2016-Parsa
May 1, 2017
Baby MIND Experiment Construction Status
M. Antonova1, R. Asfandiyarov2, R. Bayes3, P. Benoit4, A. Blondel2,
M. Bogomilov5, A. Bross6, F. Cadoux2, A. Cervera7, N. Chikuma8,
A. Dudarev4, T. Ekelo¨f9, Y. Favre2, S. Fedotov1, S-P. Hallsjo¨3, A. Izmaylov1
, Y. Karadzhov2, M. Khabibullin1, A. Khotyantsev1, A. Kleymenova1,
T. Koga8, A. Kostin1, Y. Kudenko1, V. Likhacheva1, B. Martinez2, R. Matev5,
M. Medvedeva1, A. Mefodiev1, A. Minamino10, O. Mineev1, M. Nessi4,
L. Nicola2, E. Noah2, T. Ovsiannikova1, H. Pais Da Silva4, S. Parsa2?,
M. Rayner4, G. Rolando4, A. Shaykhiev1, P. Simion9 , F.J.P. Soler3,
S. Suvorov1, R. Tsenov5, H. Ten Kate4, G. Vankova-Kirilova5 and
N. Yershov1.
1Institute of Nuclear Research, Russian Academy of Sciences, Moscow, Russia.
2University of Geneva, Section de Physique, DPNC, Geneva, Switzerland.
3University of Glasgow, School of Physics and Astronomy, Glasgow, UK.
4European Organization for Nuclear Research, CERN, Geneva, Switzerland.
5University of Sofia, Department of Physics, Sofia, Bulgaria.
6Fermi National Accelerator Laboratory, Batavia, Illinois, USA.
7IFIC (CSIC & University of Valencia), Valencia, Spain.
8University of Tokyo, Tokyo, Japan.
9University of Uppsala, Uppsala, Sweden.
10Yokohama National University, Yokohama, Japan.
Baby MIND is a magnetized iron neutrino detector, with novel design fea-
tures, and is planned to serve as a downstream magnetized muon spectrometer
for the WAGASCI experiment on the T2K neutrino beam line in Japan. One
of the main goals of this experiment is to reduce systematic uncertainties rele-
vant to CP-violation searches, by measuring the neutrino contamination in the
anti-neutrino beam mode of T2K. Baby MIND is currently being constructed
at CERN, and is planned to be operational in Japan in October 2017.
PRESENTED AT
NuPhys2016, Prospects in Neutrino Physics
Barbican Centre, London, UK, December 12–14, 2016
?This project has received funding from the European Union’s Horizon 2020 Research and Inno-
vation programme under grant agreement No. 654168.
1 Introduction
The Baby MIND experiment as the downstream MRD of the J-PARC T59 experiment
(WAGASCI) [1], was approved by the CERN Research Board in December 2015 [2].
The WAGASCI experiment, with a novel detector arragement which creates arrays
of small cubic cells whose walls are made from plastic scintillators, provides better
acceptance compared to a classical layout of successive X and Y planes scintillator
bars. The adoption of WAGASCI units for upgrades to the T2K ND280 near detector
is being considered, motivated by the need to reduce systematics due to nuclear effects
in water, one of the dominant systematic uncertainties in the T2K neutrino oscillation
analyses, and of direct relevance to the HyperK project [3].
One challenge to be addressed by the Baby MIND collaboration is that of obtaining
high charge identification efficiencies for µ+ and µ− down to 400 MeV/c. Magnetized
iron neutrino detectors are limited by multiple scattering in the iron, and their use
is overlooked for applications requiring good charge ID efficiencies below 1 GeV/c.
By optimising the distance between the first magnet modules, rendered possible by
the magnet design, our simulations show high charge identification efficiencies of 97%
down to 500 MeV/c, and capabilities for charge identification down to 300 MeV/c.
2 Baby MIND Detector design
The design and construction of the Baby MIND detector was very much constrained
by the need to operate the detector both at CERN and in Japan on a relatively short
timescale, and also the installation limitations in Japan via a narrow shaft (Figure1),
which in particular has driven the new magnetization scheme of the detector. Baby
MIND is built from sheets of iron interleaved with detector modules as shown in Figure
2, but unlike traditional layouts for magnetized iron neutrino detectors (e.g.MINOS)
which tend to be monolithic blocks with a unique pitch between consecutive steel
Figure 1: (Left) Sketch of WAGASCI detector, side MRDs and Baby MIND, (Right)
Baby MIND installation in ND280 pit.
1
Figure 2: One possible Baby MIND layout, with muons incident from the left. Scintillator
modules are referenced d0 to d17, magnet modules are referenced s1 to s33.
segments and large conductor coils threaded around the whole magnet volume, the
Baby MIND iron segments are all individually magnetized, allowing for far greater
flexibility in the setting of the pitch between segments, and in the allowable geometries
that these detectors can take. This is of relevance for neutrino experiments that might
consider muon spectrometers based on magnetized iron surrounding an active detector
volume such as plastic scintillator, water cherenkov, liquid argon.
3 Detector hardware construction
The different detector hardware components and systems are listed below:
• Magnet module.
• Scintillator detector module.
• Cable bundles.
• Front-end electronics module.
• DAQ system.
• Mechanics support systems.
The general approach of the collaboration is to ensure documentation and trace-
ability of components and systems. A construction database has been written to store
parameters relevant to the detector hardware such as detector geometrical configu-
rations, serial numbers of components and test data. The majority of systems have
undergone prototype validation before launching the production phases. Assembly
and qualification procedures are drafted for each system. Integration procedures en-
sure the correct handling of interfaces during systems integration phases.
2
Figure 3: (Left) The Magnet assembly zone, (Right) A scintillator module.
3.1 Magnet modules status
The magnetization scheme for Baby MIND was designed at CERN[4]. Construction of the
magnet modules was completed there by February 2017. The magnet modules are made
from ARMCO steel sheets with two horizontal slits machined in the center and are wrapped
by aluminium coil in a sewing pattern, Figure 3. This design allows the magnetic flux to be
very uniform in the central tracking region, and contains the return flux in the side planes.
The required horizontal magnetic field of 1.5 T can be reached for a current of 140 A and
a dissipation power of 350 W per module.
3.2 Scintillator modules status
The scintillator modules with dimensions of 2 × 3 m2 contain 95 horizontal bars and 16
vertical bars each. The bars are extruded scintillators with wavelength shifting fiber and
custom photosensor connectors manufactured under the responsibility of INR [5]. One
completed scintillator module is shown in Figure 3. A total of 18 standard detector modules
will be used in Baby MIND final layout, interleaved with magnet modules. The final position
of these modules with respect to magnet modules is not frozen yet and is subject to changes
depending on different performance priorities. The production of all the units is scheduled
to be finished for the end of April 2017.
3.3 Electronics and DAQ system
The Baby MIND electronic readout scheme has been published in ref [6]. The Front End
Board for the experiment was developed by the University of Geneva based on the CITIROC
ASIC. The readout system includes two additional ancillary boards, the Backplane and the
Master Clock Board (MCB). The readout system architecture is shown in Figure 4. After
the extensive validation tests of the FEBv1 during beam tests at the T9 beamline at CERN
with 1 to 10 GeV/c muons in summer 2016, FEBv2 was developed, integrating layout
changes dictated by cabling considerations and with additional features for daisy chaining
and synchronisation of multiple boards. The DAQ PCs are connected by USB3 links to the
first FEB in a group of 6 FEBs that are daisy chained using RJ45 links.
3
Figure 4: (Left) The electronic readout scheme, (Right) FEBv2.
4 Outlook
The collaboration is currently focused on completion of the detector construction and
preparation for the upcoming beam tests at the T9 beamline at CERN in May and
June 2017. After full characterization, the detector will be shipped to Japan in July
2017. The installation and commissioning of the detector in J-PARC will take place
in September 2017 in order to be ready for beam at J-PARC in October 2017.
References
[1] E. Noah, “The WAGASCI experiment at J-PARC to measure neutrino cross-sections
on water, PoS EPS-HEP2015 (2015) 292.
[2] M. Antonova et al., “Status report for the Neutrino Platform NP05 - Baby MIND -
experiment” , CERN-SPSC-2017-015 , SPSC-SR-210, (2017).
[3] K. Abe et al., “Physics potential of a long-baseline neutrino oscillation experiment
using a J-PARC neutrino beam and Hyper-Kamiokande”, PTEP 2015 (2015) 053C02,
(arXiv:1502.05199 [hep-ex]).
[4] G. Rolando et al., “New and Optimized Magnetization Scheme for the Baby Mag-
netized Iron Neutrino Detector at J-PARC.”, IEEE Transactions on Magnetics, May
2017, Volume 53, Issue 5.
[5] A. Montanari et al., “Measurement of parameters of scintillating bars with wavelength-
shifting fibres...”, JINST 12 (2017) no.03, P03005.
[6] E. Noah et al., “Readout scheme for the Baby MIND detector”, PoS PhotoDet2015
(2016) 031.
4


Baby MIND is a magnetized iron neutrino detector, with novel design features, and is planned to serve as a downstream magnetized muon spectrometer for the WAGASCI experiment on the T2K neutrino beam line in Japan. One of the main goals of this experiment is to reduce systematic uncertainties relevant to CP-violation searches, by measuring the neutrino contamination in the anti-neutrino beam mode of T2K. Baby MIND is currently being constructed at CERN, and is planned to be operational in Japan in October 2017

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