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  • Congrs de l'ACP / CAP Congress

    Dr. Sbastien Bianchin (TRIUMF / UBC)

    Development of an Active Kaon Stopping Target for the TREK-E36 Experiment at

    J-PARC

    29 Mai 2013 / May 29, 2013

  • S. Bianchin CAP Congress (May 27 - 31, 2013) 2

    The TREK-E36 Experiment

    The TREK-E36 Experiment at J-PARC is dedicated to the search for lepton flavor universality violation in (Ke2)/(K2)

    Talk by Prof. M. Hasinoff R2-7-4 (Thurday, May 30)

    Precise measurement of the decay width ratio: RK = (Ke2) / (K2)

    E36 Goal : RK/RK = 0.2% (stat.) 0.15% (syst.) [0.25% total]

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Active Polarimeter(JAPAN)

    New Fiber Target(CANADA)

    GEM Dectectors(USA)

    CsI(Tl) readout (RUSSIA)

    End View Side View

    The TREK Experimental Apparatus

    3

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    18 Fibres (~6cm)

    The TREK Scintillating Fiber Target

    256 Fibers (3.2 x 3.2 x 200 mm3)

    Tested (Nov. 2012), labelled and ready to be assembled

    1mm groove + green WLS fiber glued

    Assembly starts in May 2013 (K. Chang)

    4

  • S. Bianchin CAP Congress (May 27 - 31, 2013) 4

    18 Fibres (~6cm)

    The TREK Scintillating Fiber Target

    256 Fibers (3.2 x 3.2 x 200 mm3)

    Tested (Nov. 2012), labelled and ready to be assembled

    1mm groove + green WLS fiber glued

    Assembly starts in May 2013 (K. Chang)

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Production of the TREK Fibers

    5

    1. A 1mm wide groove is cut along the 20cm long scintillating fiber

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Production of the TREK Fibers

    5

    1. A 1mm wide groove is cut along the 20cm long scintillating fiber

    2. An optical glue is carefully deposited inside the groove

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Production of the TREK Fibers

    5

    1. A 1mm wide groove is cut along the 20cm long scintillating fiber

    2. An optical glue is carefully deposited inside the groove

    3. A green WLS fiber is pushed inside the groove and let to rest for 24h so that the optical glue hardens

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Production of the TREK Fibers

    5

    1. A 1mm wide groove is cut along the 20cm long scintillating fiber

    2. An optical glue is carefully deposited inside the groove

    3. A green WLS fiber is pushed inside the groove and let to rest for 24h so that the optical glue hardens

    4. A plastic coupler is glued at the other end of the green WLS fiber

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Fibers are held together by stepped acrylic pieces and 1mm-thick Aluminium rings

    7mm clearance to Aerogel Tube

    Aerogel Tube : ID 79mm OD 85mm

    Target Tube : ID 57mm OD 65mm

    6

    The TREK Scintillating Fiber Target

    Side View

    Acrylic pieces at both ends of the target

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    MPPCs (S10362-11-50C) 1 x 1 mm2 sensor 400 Pixels (50x50 m2) Gain: 7.5x105

    Better efficiency at low temperatures (0-5C) ~450 MMPCs have been tested (Nov. 2012)

    7

    The MMPC Readout

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    The Complete Setup (Concept)

    8

    Target OUT

    Target IN

    Temporary Support

  • S. Bianchin CAP Congress (May 27 - 31, 2013) 8

    The Complete Setup (Concept)Target IN

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    The TREK Dark BoxMade of G10 (light tight)

    568

    mm

    568

    mm

    The green WLS fibers are installed through a slot in the Dark Box upstream plate

    9

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    The EASIROC Board

    32-channel I/O DSP / FPGA ADC (HG and LG) Multi Hit TDC (LE and TE)

    8x 32 channel (or 4 x 64) EASIROC boards are needed to read out the 256 channels (full target)

    Designed and made in Japan

    Tested at TRIUMF

    A new 64 channel EASIROC board is currently being designed and

    should be ready for tests in 2014 !

    10

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Beam Tests & Preliminary ResultsTests performed at TRIUMF (Nov. 2012)

    11

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Beam Tests & Preliminary ResultsTests performed at TRIUMF (Nov. 2012)

    11

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    A Look Inside de Box

    32 (8x4) Fiber Bundle (~24x12mm2)

    Hit in perpendicular AND parallel directions

    12

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    A Look Inside de Box

    32 green WLS fibers coupled to 32 MPPCs

    13

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Preliminary Results : ADC Spectra

    14

    EASI

    RO

    C B

    o ard

    #1

    EAS I

    RO

    C B

    o ard

    #2

    Missing Channels (#14 & #28)

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Temperature dependence of ADC Gain

    15

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Temperature dependence of ADC Gain

    15

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Temperature dependence of ADC Gain

    15

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Temperature dependence of ADC Gain

    16

    courtesy of F. Retire

    x = -22.95T + 362.6

  • S. Bianchin CAP Congress (May 27 - 31, 2013) 17

    1 pe ~12.5 pe

    Dark Curent Analysis

    Average Energy Deposit through 3mm of plastic 0.6 MeV

    ~21 pe/MeV

    ped

    1 pe

    2 pe

    MPPC noise spectrum showing the photo-electron separation

    3 pe

    Energy spectrum for penetrating cosmic rays passing through 1 bar

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Preliminary Results : Particle Tracking

    beam

    beam

    EASI

    RO

    C B

    o ard

    #1

    EASI

    RO

    C B

    o ard

    #1

    18

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Preliminary Results : Particle Tracking

    19

    beam

    beam

    EASI

    RO

    C B

    o ard

    #2

    EASI

    RO

    C B

    o ard

    #2

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    beam

    beam

    EASI

    RO

    C B

    o ard

    #2

    EASI

    RO

    C B

    o ard

    #2

    Preliminary Results : Particle Tracking

    19

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Tracking Algorithm

    We built a set of 20 perfect tracks in

    a 64 fiber bundle

    and

    tested our tracking algorithm

    Preli

    mina

    ry

    20

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    Tracking Algorithm

    Preli

    mina

    ry

    We are now working on a better version of our tracking algorithm capable of finding the particle tracks for MC simulated events and later on for real data collected during our beam tests

    21

    courtesy of D. Gill

  • S. Bianchin CAP Congress (May 27 - 31, 2013)

    The TREK Collaboration

    22

    Slide 1Slide 2Slide 3Slide 4Slide 5Slide 6Slide 7Slide 8Slide 9Slide 10Slide 11Slide 12Slide 13Slide 14Slide 15Slide 16Slide 17Slide 18Slide 19Slide 20Slide 21Slide 22Slide 23Slide 24Slide 25Slide 26Slide 27Slide 28Slide 29Slide 30Slide 31