M. Rayner

The design and commissioning of the MICE upstream time-of-flight system

In the MICE experiment at RAL the upstream time-of-flight detectors are used for particle identification in the incoming muon beam, for the experiment trigger and for a precise timing (σt∼50ps) with respect to the accelerating RF cavities working at 201 MHz. The construction of the upstream section of the MICE time-of-flight system and the tests done to characterize its individual components are shown. Detector timing resolutions ~50–60ps were achieved. Test beam performance and preliminary results obtained with beam at RAL are reported.

New and Optimized Magnetization Scheme for the Baby Magnetized Iron Neutrino Detector at J-PARC

The Baby-MIND (magnetized iron neutrino detector) collaboration is building a muon detector to be installed downstream of the WAGASCI experiment at J-PARC (Japan). Due to the challenging timeline and space constraints for the installation in the ND280 pit, an innovative magnetization scheme has been developed for the iron plates. The magnetization scheme optimizes flux return for minimum stray field and operating current, while maximizing the useful tracking area with

Performance test of new MPPC for a new neutrino detector WAGASCI

B > 1.5

Baby MIND: A magnetised spectrometer for the WAGASCI experiment

T. The 33 iron plates of the detector are individually magnetized by coils wound on their surface by “sewing” an aluminum conductor through slits cut in the plates. In this paper, we present the details of the magnetization scheme and coil winding procedure as well as the results of magnetization tests performed on a prototype module and the first eighteen detector plates.

Development of electronics and data acquisition system for the J-PARC T59 (WAGASCI) experiment

F. Hosomi∗,1 N. Chikuma,1 A. Izmaylov,1 T. Koga,1 M. Yokoyama,1 M. Antonova,2 M. Khabibullin,2 A. Khotjantsev,2 Y. Kudenko,2 A. Mefodiev,2 O. Mineev,2 T. Ovsiannikova,2 S. Suvorov,2 N. Yershov,2 A. Bonnemaison,3 R. Cornat,3 O. Drapier,3 O. Ferreira,3 F. Gastaldi,3 M. Gonin,3 Th. A. Mueller,3 A. Blondel,4 F. Cadoux,4 Y. Favre,4 E. Noah,4 M. Rayner,4 T. Hayashino,5 A. K. Ichikawa,5 A. Minamino,5 K. Nakamura,5 T. Nakaya,5 B. Quilain,5 J. Harada,6 K. Kin,6 Y. Seiya,6 K. Yamamoto,6 Y. Hayato7 1The University of Tokyo, Department of Physics, Tokyo, Japan 2Institute for Nuclear Research of the Russian Academy of Sciences, Moscow, Russia 3Ecole Polytechnique, IN2P3-CNRS, Laboratoire Leprince-Ringuet, Palaiseau, France 4University of Geneva, Section de Physique, DPNC, Geneva, Switzerland 5Kyoto University, Department of Physics, Kyoto, Japan 6Osaka City University, Department of Physics, Osaka, Japan 7The University of Tokyo, Institute for Cosmic Ray Research, Kamioka Observatory, Kamioka, Japan

The Baby MIND spectrometer for the J-PARC T59(WAGASCI) experiment

The WAGASCI experiment being built at the J-PARC neutrino beam line will measure the ratio of cross sections from neutrinos interacting with a water and scintillator targets, in order to constrain neutrino cross sections, essential for the T2K neutrino oscillation measurements. A prototype Magnetised Iron Neutrino Detector (MIND), called Baby MIND, has been constructed at CERN and will act as a magnetic spectrometer behind the main WAGASCI target. Baby MIND will be installed inside the WAGASCI cavern at J-PARC in the beginning of 2018. Baby MIND will be able to measure the charge and momentum of the outgoing muon from neutrino charged current interactions, to enable full neutrino event reconstruction in WAGASCI. During the summer of 2017, Baby MIND was operated and characterised at the T9 test beam at CERN. Results from this test beam will be presented, including charge identification performance and momentum resolution for charged tracks. These results will be compared to the Monte Carlo simulations. Finally, simulations of charge-current quasi-elastic (CCQE) neutrino interactions in an active scintillator neutrino target, followed by the Baby MIND spectrometer, will be shown to demonstrate the capability of this detector set-up to perform cross-section measurements under different assumptions.

Baby MIND: A magnetized segmented neutrino detector for the WAGASCI experiment

WAGASCI is a new experiment at J-PARC neutrino beamline, to measure the cross section ratio of charged current neutrino interaction on nucleus between water target and plastic target with the accuracy of a few percent. The detector adopts three-dimensional grid structure of 3-mm-thick scintillator bars around water and plastic targets, to obtain large angular acceptance. As a photodetector a 32-channel arrayed MPPC has been developed for the WAGASCI detector, and the total number of channels is 1280 for each module. Our front-end electronics is SPIROC2D, a product of Omega, which is an auto-triggered, bi-gain, 36-channel ASIC, allowing to measure the charge from one to 2000 photoelectron and the time with 100ps step. It contains a 16-deep analog memory array, which allows to store 16 hits in an acquisition gate. The back-end boards control the data output from the front-end ASIC and reception of trigger signals for neutrino beam. The module construction has been completed and the data acquisition system has almost been completed, to be ready for the neutrino beam measurement from October 2017.

Synchronization of the distributed readout frontend electronics of the Baby MIND detector

The Baby MIND spectrometer is designed to measure the momentum and charge of muons from neutrino interactions in water and hydrocarbon targets at the J-PARC T59 (WAGASCI) experiment. The WAGASCI experiment will measure the ratio of neutrino charged current interaction cross-sections on water and hydrocarbon aiming at reducing systematic errors in neutrino oscillation analyses at T2K. Construction of the Baby MIND detector within the CERN Neutrino Platform framework was completed in June 2017, where it underwent full commissioning and characterization on a charged particle beam line at the Proton Synchrotron experimental hall.

Readout scheme for the Baby-MIND detector

T2K (Tokai-to-Kamioka) is a long-baseline neutrino experiment in Japan designed to study various parameters of neutrino oscillations. A near detector complex (ND280) is located 280 m downstream of the production target and measures neutrino beam parameters before any oscillations occur. ND280s measurements are used to predict the number and spectra of neutrinos in the Super-Kamiokande detector at the distance of 295 km. The difference in the target material between the far (water) and near (scintillator, hydrocarbon) detectors leads to the main non-cancelling systematic uncertainty for the oscillation analysis. In order to reduce this uncertainty a new WAter-Grid-And-SCintillator detector (WAGASCI) has been developed. A magnetized iron neutrino detector (Baby MIND) will be used to measure momentum and charge identification of the outgoing muons from charged current interactions. The Baby MIND modules are composed of magnetized iron plates and long plastic scintillator bars read out at the both ends with wavelength shifting fibers and silicon photomultipliers. The front-end electronics board has been developed to perform the readout and digitization of the signals from the scintillator bars. Detector elements were tested with cosmic rays and in the PS beam at CERN. The obtained results are presented in this paper.

Baby MIND Experiment Construction Status

Baby MIND is a new downstream muon range detector for the WGASCI experiment. This article discusses the distributed readout system and its timing requirements. The paper presents the design of the synchronization subsystem and the results of its test.