LBNF/DUNE Beam & Target System John Back, University of Warwick - - PowerPoint PPT Presentation

LBNF

LBNF/DUNE Beam & Target System

John Back, University of Warwick DUNE UK Meeting March 5, 2019

Introduction

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• Neutrinos from decays of secondary particles (,,K):
• 120 GeV proton collisions with graphite target, 1.2 MW then 2.4 MW
• 3-horn focusing system, ~2m long (4) graphite target
• See Beam Optimisation Task Force report: DUNE-doc-2901
• High Power Target RAL group (Chris Densham et al.) is to build

the target:

• Fermilab will do Horns & rest of Target Station (e.g. shielding)
• News on:
• RAL target proposal & preliminary designs
• Target physics performance

LBNF Beamline Layout

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Fig from DUNE-doc-7338

Target Station Geometry

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Fig from DUNE-doc-7554

RAL “LBNF/DUNE Beam & Target System” Project

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• Phase 1: Jan 2019 – Mar 2022: design, prototyping & costing
• Successful full funding obtained from STFC (~£1.4M)
• Very strong science case & impact recognised by Projects Peer

Review Panel (PPRP) and Accelerator Strategy Board (ASB)

• No project descoping  maximises design phase effort
• Phase 2: Apr 2022 – Mar 2026: procurement & manufacture
• Proposal due 1st half 2021 for PPRP review (~£4.6M)
• Phase 3: Apr 2026 – Sept 2028: installation & commissioning
• Dates depend on international project schedule
• Sept 2028 onwards: ongoing maintenance & support similar to T2K

Target Project Priority List

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• Design & build 1 prototype & 1 operational target (1.2 MW)
• Design & build target support & interface with 1st magnetic horn
• Design & build target remote handling/replacement system
• Specify, select & supply master-slave manipulators
• Specify & supply key components for He target cooling plant
• Design & build instrumented collimator, protecting downstream

components from missteered beam

2m Target with Downstream Support

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2m Target with Downstream Support

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Double (2 x 1m) Target Concept

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Target 1 Target 2 Horn current striplines Beam

Upstream Target He Cooling

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Double (2 x 1m) Target Downstream Detail

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He flow

Single Cantilevered Target

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CP Sensitivity vs Target Length: Geant4 studies

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3+3 years running, normal hierarchy, 120 GeV protons, 1.2 MW power, target R = 8 mm, beam  = R/3

Summary

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• Successful STFC funding for Phase 1 target engineering design
• Investigating 3 graphite target options:
• Single ~2 m cylinder with upstream & downstream supports
• Double (2 x ~1m) cylindrical target
• Single ~1.5 m cantilevered target (upstream support only)
• Detailed design work by RAL:
• Target supports, interface with 1st horn, alignment & He cooling
• Assuming full 2.4 MW beam power
• Checking physics performance with Geant4 (Warwick)

LBNF Beamline Schedule (DUNE-doc-7338)

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FY28 FY27 FY26 FY25 FY24 FY23 FY22 FY21 FY20 FY19 FY18

March-30 CD-4 (early completion)

FY29

Dec-19 CD-2/3b Project Baseline & FS

• Constr. Approval

Primary Beam Enclosure Beneficial Occupancy Conventional Facilities Construction Complete Absorber Hall Beneficial Occupancy Beamline Complete March-22 CD-3 NS

• Constr. Approval

FY30

Target Hall Beneficial Occupancy

Extraction Enclosure (Long Shut Down) Primary Beam Enclosure

Magnets Horns Target Shield Pile Disassemble MI Components Conventional Construction Install New / Existing Components Upstream of Shield Wall - completed during long shut down Downstream of Shield Wall

Beamline Design Target Hall Beamline Checkout Period

Install Target Shield Pile Mechanical and Electrical Rough-in Install Horn A, B, C and initial Power-up Absorber Component Installation Remote Handling and Muon DAQ Mechanical and Electrical Rough-in Remote Handling Commissioning

Start MI Long Shutdown

Procurement and Assembly