J-PARC Neutrino Experimental Facility - Index to individual talks - - - PowerPoint PPT Presentation

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J-PARC Neutrino Experimental Facility - Index to individual talks - - - PowerPoint PPT Presentation

Dec 13, 2022 28 likes •334 views

J-PARC Neutrino Experimental Facility - Index to individual talks - Yoshiaki Fujii (KEK/J-PARC) for the Neutrino Experimental Facility 1. Perspective 2. T2K experiment 3. J-PARC Overview 4. Neutrino Experimental Facility 5. Summary

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SLIDE 1
  • 1. Perspective
  • 2. T2K experiment
  • 3. J-PARC Overview
  • 4. Neutrino Experimental Facility
  • 5. Summary

J-PARC Neutrino Experimental Facility

  • Index to individual talks -

Yoshiaki Fujii (KEK/J-PARC) for the Neutrino Experimental Facility

2017/9/18 NBI 2017 1

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SLIDE 2
  • 1. Perspective

2017/9/18 NBI 2017 2

KEK-PS (5.5kW) J-PARC (1.3MW)

. . . and New Accelerator

Super Kamiokande SK-II

SuperKamiokande-IV SK-Gd Hyper-K K2K T2K T2K-II

. . . and New Experiment

n-nucleus interaction

J-PARC & Kyper-K Beam Detectors Neutrino Experiments

ND280

Intense neutrino beam test bench ND280-Upgraded

. . . and New Detector SK-III

J-PARC (à750kW) MINOS NuMI 750kW NOvA

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SLIDE 3
  • 1. Perspective

2017/9/18 NBI 2017 3

KEK-PS (5.5kW) J-PARC (1.3MW)

. . . and New Accelerator

Super Kamiokande SK-II

SuperKamiokande-IV SK-Gd Hyper-K K2K T2K T2K-II

. . . and New Experiment

n-nucleus interaction

J-PARC & Kyper-K Beam Detectors Neutrino Experiments

ND280

Intense neutrino beam test bench ND280-Upgraded

. . . and New Detector SK-III

J-PARC (à750kW) MINOS NOvA

My talk on this

NuMI 750kW

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SLIDE 4

T2K Experiment

2017/9/18 NBI 2017 4

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SLIDE 5
  • 2. T2K experiment - Outline

2017/9/18 NBI 2017 5

Super Kamiokande Near Detector ND280 Neutrino Beam With intense muon neutrino (or anti-neutrino) beam generated at J-PARC, and with ND280 and Super-Kamiokande detectors, measure neutrino oscillation and obtain

  • neutrino mixing angles qij
  • CP phase angle d

J-PARC @ Tokai

T2K collaboration with ~500 reseachers from 62 institutes of 11 countries.

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SLIDE 6
  • 2. T2K experiment- Achievement

2017/9/18 NBI 2017 6

Stable 460kW operation achieved Total accumulated POT reached 22.3 x1020 ne appearance w/2.5s ne appearance w/7.3s

First suggestion on dcp 1st combined anaysisà dcp, maximal q23 maximal q23

n q23

maximal

ne

appearance

ne appearance w/3.1s dcp=0 w/90%C.L. dcp=0 w/95%C.L.

slide-7
SLIDE 7
  • 2. T2K experiment- Achievement

2017/9/18 NBI 2017 7

Stable 470kW operation chieved Total accumulated POT reached 22.3 x1020

ne appearance w/2.5s

First suggestion on dcp 1st combined anaysisà dcp, maximal q23 maximal q23

n q23

maximal

ne

appearance

ne appearance w/3.1s dcp=0 w/90%C.L. ne appearance w/7.3s

slide-8
SLIDE 8
  • 2. T2K experiment- Achievement

2017/9/18 NBI 2017 8

Stable 470kW operation chieved Total accumulated POT reached 22.3 x1020

ne appearance w/2.5s ne appearance w/7.3s

First suggestion on dcp 1st combined anaysisà dcp, maximal q23

n q23

maximal

ne

appearance

ne appearance w/3.1s dcp=0 w/90%C.L.

maximal q23

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SLIDE 9
  • 2. T2K experiment - Newest Results

2017/9/18 NBI 2017 9

On Aug. 4th, T2K released the newest analysis results using 22.3 x1020 POT data.

dCP ; CP conserving values 0, p fall

  • utside of the 2s C.L. interval.

q23 consistent to maximal mixing.

Best-fit dCP = -1.83 for N.H.

+0.60

  • 0.66

[ Plots taken from the seminor by M.Hartz ]

Needs to accumulate more data for more conclusive results.

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SLIDE 10
  • 2. T2K experiment - T2K-II : Extended T2K Operation

2017/9/18 NBI 2017 10

Extension to T2K-II obtained stage-1 status at the J-PARC PAC of July 2016.

  • Accumulate 20x1021 POT by 2026 for

3s sensitivity to CP violation in neutrino oscillation.

  • With >MW accelerator & neutrino beam-line,

ND-upgrade, and Gd-added SK ND upgrade in progress with CERN SPSC EoI-015. T2K-II

T2K-II improved feature ・MR beam power to 1.3MW with

  • 1.16s operation cycle with new P.S.
  • reinforced RF system

・Neutrino beamline upgrade for

  • cooling capacity improvement
  • radio-active water disposal

・Install new detectors in ND280 ・SK tank refurbishment and adding Gd

M.H. unknown case

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SLIDE 11
  • 2. T2K experiment - Beyond T2K-II : J-PARCàHyper-K, and more

2017/9/18 NBI 2017 11

Hyper-Kamiokande Detector

  • Fiducial volume = 190kton (x10 than SK)
  • For various physics stronghold

J-PARC 1.3MW beam for Hyper-K

  • Establish CP violation and precision neutrino physics
  • KEK's first priority in Project Implementation Plan.

Project Status

  • On the MEXT Roadmap and Science Council's Master Plan
  • MoU concluded between ICRR and KEK/IPNS on promotion.
  • Budget request planned to be submitted from U.Tokyo

Comparison with DUNE depends

  • n assumption.

Discussions/R&Ds are being held for further ambicious projects

  • Intermediate detector / Far detector at Korea / Liq.Ar detector
  • New booster ring at J-PARC
  • New proton LINAC at Tsukuba

and more.

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SLIDE 12
  • 3. J-PARC Overview

2017/9/18 NBI 2017 12

LINAC RCS MR

Neutrino

MLF Hadron

LINAC : 330m-long. Accelerate H- to 400MeV and inject to RCS. RCS : 350m-circumference. Convert H- to proton and accelerate to 3GeV, and pass to MLF/MR. MR : 1.5km-circumference. Accelerate proton to30GeV and hand it to hadron or neutrino experimental facilities.

Neutrino experimental facility

MLF : Material science and life science with neutron and muon beam. Hadron : Particle nd Nuclear physics using secpndary beam. 2001 Start construction Nov.2006 LINAC operation start Oct.2007 RCS operation start May 2008 MLF/MR operation start Dec.2008 MR achieved 30GeV Jan.2009 Hadron experiment start Apr.2009 Neutrino experiment start

J-PARC = Japan Proton Accelerator Research Complex

Jointly constructed and operated by JAEA and KEK for wide research purposes from elementary particle to life science.

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SLIDE 13

Neutrino Experimental Facility

2017/9/18 NBI 2017 13

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SLIDE 14
  • 4. Neutrino Experimental Facility : Event History

2017/9/18 NBI 2017 14

Start Experiment First Beam in April 2009 The earthquake Hadron Accident MLF fire Horn replacement Target He pipe repair Beam window replacement Fx septum failures. MR vacuum leak. PS trip. Neu vacuum leak N.C. & Horn Power supply renewal

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SLIDE 15
  • 4. Neutrino Experimental Facility : Outline

2017/9/18 NBI 2017 15

Beam Dump Muon Monitors

295km To Kamioka

Target Horns Helium Vessel

p

µ

n

Decay Volume Near Neutrino Detectors

Neutrino beam and Near Detectors Secopndary Beamline Primary Beamline

Pacific Ocean

Main Ring Acceleraotr Forest for wind/sand break

slide-16
SLIDE 16

Primary Beamline

2017/9/18 NBI 2017 16

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SLIDE 17
  • 4. Neutrino Experimental Facility ; Primary Beamline

2017/9/18 NBI 2017 17

P p

µ

n

Preparation Section : Beam parameter conversion from MR to ARC. Normal-Conducting Magnets ARC section : Bend beam to Kamioka by 80° Super-Conducting Magnets Final Focus section : Targetting Normal-Conducting Magnets

The purpose of the primary beam line is to deliver protons on the target

  • with proper position, size and angle
  • accurately, stably and reliably
  • high-quality neutrino beam
  • human/beamline safety

}for{

Key Components:

  • Beam Monitors
  • Control and Interlocks
  • Magnet Power Supplies

295km To Kamioka

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SLIDE 18
  • 4. Neutrino Experimental Facility ; Primary Beamline

18

The purpose of the primary beam line is to deliver protons on the target

  • with proper position, size and angle
  • accurately, stably and reliably

Findings

・Successfully delivering 460kW beam stably and accurately with high up-time and low beam loss, thus low residual radiation. (The most downstream part suffers high radiation from target station.) ・A few faults experienced. Countermeasure installed, and system further enhanced. ・Expect almost no issue (but not none) up to 750kW. Several improvement needed for 1.3MW. Wait for talks of Sakashita-san for control/interlock, Megan-san, Yu-san, and Ashida-san for beam monitors.

2017/9/18 NBI 2017

  • high-quality neutrino beam
  • human/beamline safety

}for{

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SLIDE 19
  • 4. Neutrino Experimental Facility ; Primary Beamline

19

The purpose of the primary beam line is to deliver protons on the target

  • with proper position, size and angle
  • accurately, stably and reliably

A few words on other components

・Normal-conducting magnets are excellent. Caused no beam down. Water-leak happened once during annual maintenance. Upstream magnets are non-organic. However beam loss is far lower than feared. ・Power supplies for N.C. magnets were all renewed in 2014. No trips/fluctuations/jumps observed except for initial failure. ・Super-conducting magnets and cryogenic system are also excellent. Very few unexpected quench happened. ・Periodical survey with laser tracker/optical scopes/GPS conducted.

  • LT gives ~20µm-accuracy.
  • GPS direction accuracy ~0.1mrad, stability ~0.01mrad (3m/300km).

・Water-level height gauge continuously monitoring the tunnel floor height.

2017/9/18 NBI 2017

  • high-quality neutrino beam
  • human/beamline safety

}for{

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SLIDE 20

Secondary Beamline

2017/9/18 NBI 2017 20

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SLIDE 21
  • 4. Neutrino Experimental Facility ; Secondary Beamline

2017/9/18 NBI 2017 21

P p

µ

n

Near Neutrino Detectors Target Station He-filled vessel for target and horns with shields & remotes. Decay Volume Let pions decay into muon and muon neutrino Beam Dump Block-off particles other than neutrino

Key Issues:

  • Heat Load
  • Radioacitve waste

Target Horns to focus neutrino beam Muon Monitors Real-time measure- ment of neutrino beam properties

295km To Kamioka

Secondary Beam-line The purpose of the secondary beam line is simply to generate neutrino

  • withstanding heat load,

thermal shock and radiation damage,

  • handling radiation and

radioactive waste Window Baffle

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SLIDE 22
  • 4. Neutrino Experimental Facility ; Secondary Beamline

2017/9/18 NBI 2017 22

Near Neutrino Detectors

Beam Window

  • Separate proton beamline vacuum and helium vessel.
  • 0.3mm Ti, double layered,

helium flow in gap for cooling.

  • Designed to work at 750kW
  • Cooling enhancement

needed for 1.3MW.

  • Initial window used from

2009 to 2017. Replaced this summer.

See Nakadaira-san's talk and Tada-san's talk for detail.

Target Station He-filled vessel for target and horns with shields & remotes. Decay Volume Let pions decay into muon and muon neutrino Beam Dump Block-off particles other than neutrino Target Horns to focus neutrino beam Muon Monitors Real-time measure- ment of neutrino beam properties Window Baffle

Photo & Drawing by Matt Rooney

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SLIDE 23
  • 4. Neutrino Experimental Facility ; Secondary Beamline

2017/9/18 NBI 2017 23

Baffle

  • Protect horns from beam halo/mis-steered beam.

Did work so on Fx septum failure in 2016.

  • Water-cooled graphite core with 32mm-f. bore.
  • No troubles. Should work at 750kW.
  • Position mover preferred in future.

No talks this time.

Target Station He-filled vessel for target and horns with shields & remotes. Decay Volume Let pions decay into muon and muon neutrino Beam Dump Block-off particles other than neutrino Target Horns to focus neutrino beam Muon Monitors Real-time measure- ment of neutrino beam properties Window Baffle

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SLIDE 24
  • 4. Neutrino Experimental Facility ; Secondary Beamline

2017/9/18 NBI 2017 24

Target

  • Graphite, 90cm-long, in Ti-case, helium-cooled.
  • Designed to work at 750kW
  • Cooling enhancement needed for 1.3MW.
  • Replaced in 2013 when horn1 replaced.
  • Helium pipe leaked and replaced in 2015.

See Nakadaira-san's talk for detail.

Target Station He-filled vessel for target and horns with shields & remotes. Decay Volume Let pions decay into muon and muon neutrino Beam Dump Block-off particles other than neutrino Target Horns to focus neutrino beam Muon Monitors Real-time measure- ment of neutrino beam properties Window Baffle

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SLIDE 25
  • 4. Neutrino Experimental Facility ; Secondary Beamline

2017/9/18 NBI 2017 25

Horn

  • Three horns to focus pions, thus neutrinos.
  • Operating stably with no major trouble.

Some issues on capacitors and nitride acid.

  • Replaced in 2013 for better performace à à à à
  • Designed to operate with 320kA.

Has been operating at 250kA (10% flux reduction). Needs new transformers for 320kA operation. (And having horn spares preferred.)

  • Cooling enhancement needed for 750kW and beyond.
  • Needs three sets of new power supplies/transformers for 1.3Hz operation.

(Already installed one set for horn1.)

See Sekiguchi-san's talk and Eric-san's talk for detail.

Target Station He-filled vessel for target and horns with shields & remotes. Decay Volume Let pions decay into muon and muon neutrino Beam Dump Block-off particles other than neutrino Target Horns to focus neutrino beam Muon Monitors Real-time measure- ment of neutrino beam properties Window Baffle

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SLIDE 26
  • 4. Neutrino Experimental Facility ; Secondary Beamline

2017/9/18 NBI 2017 26

Target Satation

  • Housing helium-filled vessel with a target, horns, and thick radiation shields in it.
  • Operating highly-radioacitve cooling water system, helium-gas cooling system,

and air-conditioning/exhaust system.

  • bruising effort on cooling water everlasting.
  • Bulky helium compressor broke in Jan. and

stopped beam for two weeks. Overhauled.

  • Base of remote handling system.
  • Maintenance area with manipulators.
  • Horn exchange in 2013.
  • Target-cooling helium-pipe replacement in 2015.
  • Beam window replacement in 2017.

See Tada-san's, Nakadaira-san's and Oyama-san's talks for detail.

Target Station He-filled vessel for target and horns with shields & remotes. Decay Volume Let pions decay into muon and muon neutrino Beam Dump Block-off particles other than neutrino Target Horns to focus neutrino beam Muon Monitors Real-time measure- ment of neutrino beam properties Window Baffle

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SLIDE 27
  • 4. Neutrino Experimental Facility ; Secondary Beamline

2017/9/18 NBI 2017 27

Decay Volume and Beam Dump

  • Huge heat load due to decay products and primary protons.
  • Water-cooled graphite core (BD)

and water-cooled iron plate (DV).

  • Designed to work at 4MW.

Though not proven, no foreboding yet.

  • Operating very reliably. Almost no

down-time caused by BD/DV.

  • Operating highly-radioacitve cooling

water system and air-exhaust system.

  • bruising effort on cooling water

everlasting.

No talks this time.

Target Station He-filled vessel for target and horns with shields & remotes. Decay Volume Let pions decay into muon and muon neutrino Beam Dump Block-off particles other than neutrino Target Horns to focus neutrino beam Muon Monitors Real-time measure- ment of neutrino beam properties Window Baffle

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SLIDE 28
  • 4. Neutrino Experimental Facility ; Secondary Beamline

2017/9/18 NBI 2017 28

Muon Monitor

  • Measure muons produced by pion à muon + neutrino.
  • Bunch-by-bunch measurement of muons tells profile of neutrino beam.
  • Essential role in beam comissioning and neutrino beam quality check.
  • Composed of ionization chambers and Si-pad array.
  • May need improvement before 750kW, under examination.

See Ashida-san's talk for detail.

Target Station He-filled vessel for target and horns with shields & remotes. Decay Volume Let pions decay into muon and muon neutrino Beam Dump Block-off particles other than neutrino Target Horns to focus neutrino beam Muon Monitors Real-time measure- ment of neutrino beam properties Window Baffle

slide-29
SLIDE 29

Summary

2017/9/18 NBI 2017 29

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SLIDE 30
  • 5. Summary

2017/9/18 NBI 2017 30

Operating since 2009, and now stably operating at 460kW.

  • Experienced a few major troubles, and treated/solved.
  • Besides, operation is basically stable.
  • Basically no major issue to realize 750kW.
  • Beyond 750kW needs efforts.

See individual talks for detail.

With intense neutrino beam generated at J-PARC and large detector Super-Kamiokande, T2K has been the world-leading neutrino experiment. With higher beam power, Gd-added SK, and upgraded ND, T2K and T2K-II will continue to be the world-leading experiment. Hyper-K/Higher-power J-PARC will open new era in neutrino physics.