Super-beam work package in the Euro ν DS: status and plans

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Super-beam work package in the Euro ν DS: status and plans. Marco Zito Dapnia-Saclay On behalf of the SB wp team IDS CERN 30/3/2007. Thanks to C. Densham and M. Dracos for providing materials!. Outline. Superbeam : status About this workpackage - PowerPoint PPT Presentation

Transcript of Super-beam work package in the Euro ν DS: status and plans

  • Super-beam work package in the EuroDS:status and plansMarco ZitoDapnia-SaclayOn behalf of the SB wp teamIDS CERN 30/3/2007Thanks to C. Densham and M. Dracos for providing materials!

  • OutlineSuperbeam : statusAbout this workpackageFocusing on the most challenging/crucial problems : The targetThe collectorThe target/collector integrationNeutrino beam simulation

    Deliverable: a CDR for the Superbeam!

    Participating institutes: IN2P3, CEA, CCLRC, Cracow U. of Technology + other additional partners (inside and outside Europe)

  • Super-Beams projectsprojet BNLprojet FermilabCf talks by M.Bishai and N. Saoulidou

  • Status*

  • Work at RAL on T2K target, windows for 750 kW operation

    -> Beam dump designed for 3-4 MW operation -> Continue studies for 3-4 MW operation e.g. beam window, target limitsTarget within magnetic hornHelium cooling of target

  • Superbeam in Japan : T2K phase 2Beam Power (MW)0123Japanese Fiscal Year (Apr-Mar)20082009201020112012400MeV LINAC from FY2011T2K needs Serious Upgrade

  • What Euro DS Superbeam is about-1Consider as baseline the SPL to Frejus conceptMEMPHYSFar detector R/D, feasibility, etc. is covered by the Laguna DS

  • What Euro DS Superbeam is about-2Proton driver and target : many issues in common between Super-beam and NFDecide to join forces and tackle these problems in this WPThe NF WP will focus on the muon front-endThe conclusion of this WP will then be incorporated in the SB and NF CDRs

  • ~300 MeV n m Neutrinossmall contamination from ne (no K at 2 GeV!)Super-BeamFocus of this DS

  • SPLSee presentation by Roland Garoby CDR for SPL already available Refinements, R/D, further studies in other frameworks (HIPPI, IA )Changes to this proton-driver design only from the optimization of the target and collection or from the physics and detector studies

  • CERN Super-Beam (SPL)recent document

  • CERN Super-Beam (SPL)Possible energy upgrade to 5 GeV could be the subject of a 3rd CDR (CDR3)R. Garoby @NuFact06

  • 5 GeV version of the SPLSPL (CDR3) characteristicsIncreasing the energy of the SPL (CDR2) is obtained by adding 105 m of b=1 superconducting accelerating structures and 14 klystrons [704 MHz 5 MW].

    R. Garoby @NuFact06

    Ion speciesH-Kinetic energy5GeVMean current during the pulse40mAMean beam power4MWPulse repetition rate50HzPulse duration0.4msBunch frequency352.2MHzDuty cycle during the pulse62 (5/8)%rms transverse emittances0.4p mm mradLongitudinal rms emittance0.3p deg MeVLength535m

  • The target300-1000 J cm-3/pulse Severe problems from : sudden heating, stress, activationSafety issues !Baseline for NF is mercury jet, for superbeam is solid targetExtremely difficult problem : need to pursue two approaches : Liquid metal target (Merit experiment)Solid target (extensive R/D program at CCLRC)Envisage alternative solutions

  • MERITMERIT experiment will test Hg jet in 15-T solenoid24 GeV proton beam from CERN PSscheduled Spring 200715-T solenoid during tests at MITHg delivery and containment system under construction at ORNL. Integration tests scheduled this Fall at MIT.

  • Solid target study programme at RALFuture ProgrammeContinue wire tests with Tungsten and Graphite. Continue modelling computations.VISAR measurements to asses the properties of tungsten, and any changes, during the wire tests. (Effect of thermal shock.)Tests with a proton beam to confirm wire tests and VISAR measurements but limited number of pulses.Radiation damage studies.Test alloys of tungsten.Design & build a model of the target bar system.Design the solenoid.Design and cost the complete target station including the beam dump.

  • R. Bennett @NUFact06

  • Pulsed Power Supply. 0-60 kV; 0-10000 A100 ns rise and fall time 800 ns flat topRepetition rate 50 Hz or sub-multiples of 2Coaxial wiresTest wire, 0.5 mm Vacuum chamber, 2x10-7 -1x10-6 mbarSchematic circuit diagram of the wire test equipmentR. Bennett @NUFact06

  • R. Bennett @NUFact06

  • Some Results of 0.5 mm diameter wiresEquivalent Target: This shows the equivalent beam power (MW) and target radius (cm) in a real target for the same stress in the test wire. Assumes a parabolic beam distribution and 4 micro-pulses per macro-pulse of 30 s.Equivalent TargetR. Bennett @NUFact06

  • R. Bennett @NUFact06

  • A new Nufact/SuperBeam target concept being studied at RAL: fluidised jet of particlesA Fluidised jet of tungsten or tantalum particles in He could be used as a neutrino factory target

    It could have high Z + high volume densityCan be effectively removed from the solenoid field hence reducing the pion reabsorptionCan be replenished as particles wear outParticles can be easily cooled (in an external fluidised bed)C. Densham

  • Attractions of fluidised target conceptCombines the advantages of the solid target with those of the liquid target Solid displacement without moving parts Shock waves constrained within the material (no cavitation, no splashing) Highly effective cooling of the target material Favourable material geometry for the stress waves Target easily replenished and reasonably safely contained Nothing else on the beam line apart from the target material

    BUT: Is it technically feasible? - Study needed

    www.tudelft.nlC. Densham

  • Outline Targets ProgrammeResults of MERIT experiment at CERN eagerly anticipated. This will answer many technical questions regarding liquid metal jet targets and will inform future Nufact targets programme Continue solid target studiesContinue fluidised particle jet target studies Begin studies of target integration with collection system both for Nufact (solenoid) and for SuperBeam (magnetic horn)Important synergies with R/D in US labs

  • The collectorFocus on the magnetic horn collection methodInitial design at CERN followed by optimization and redesignCurrents: 300 kA (horn) and 600kA (reflector)Horn : 3mm to minimize energy deposition50 Hz (vs a few Hz up to now) Longevity in a high power beamLarge em wave, thermo-mechanical stress, vibrations, fatigue, radiation damage

  • CollectorMain challenges:design of a high current pulsed power supply (300 kA/100 s/50 Hz), cooling system in order to maintain the integrity of the horn despite of the heat amount generated by the energy deposition of the secondary particles provided by the impact of the primary proton beam onto the target, definition of the radiation tolerance,integration of the target.

  • CollectorshornsOr solenoidIn operationcompletedbuiltMiniBooNECNGSK2K(SB)NUMIIn operationM. Dracos

  • Previous StudiesS. Gilardoni: Horn for Neutrino Factory and comparison with a solenoid Cazes: Horn for SPL

  • Focusing system: magnetic horn ProtonsCurrent of 300 kATo decay channelpHg TargetB1/RB = 0M. Dracos

  • Horn prototype ready for testsM. Dracos

  • Proposed designParticle at targetIn collaboration with LAL2.2 GeV protonsM. Dracos

  • New Geometry2.2 GeV proton beam : = 405MeV/c = 603.5 GeV proton beam : = 492MeV/c = 55

    z(m)r(m)I = 300 kAmp30 cm4 cmz(m)r(m)I = 300 kAmp30 cm4 cmM. Dracos

  • Power Supply for horn pulsing (major issue)values considered by CERNM. Dracos

  • the power supplyDue to the high price go to a modular system and increase small by small the currentM. Dracos

  • Neutrino Beam simulationNeeded to optimize the target, collector, decay tunnelUse modern tools (GEANT 4) and recent data (HARP)Input to the physics work package for the performance evaluationNeed to develop in synergy with similar studies in existing SB and in the IDS community

  • "Physics" studies to be restartedenergy depositionz (cm)P (kW)z (cm)cornecorne 2M. Dracos

  • Sensitivity 3.5GeVsin22q1310-110-210-3Dm22310-310-210-490%CL95%CL99%CLMinimum:q13= 1.2(90%CL)PreliminaryA.Cazes thesis

  • ConclusionsSuperBeam work package of the Euro DS is focusing on the key issues for this projectThe SPL to Frjus project is the baselineThe SPL CDR2 study is an excellent starting point for the proton driverFeasibility and conceptual solutions for the target and collector (horn) will be studiedA strong European collaboration is ready to contribute to this field

  • Scenario for accumulation and compression (2/13)Accumulator[120 ns pulses -60 ns gaps]SPL beam[42 bunches -21 gaps]Compressor[120 ns bunch -V(h=3) = 4 MV]Target[2 ns bunches 6 times]R. Garoby @NuFact06

    AccumulationDuration = 400 ms

    Compressiont = 0 ms

    t = 12 ms

    t = 24 ms

    t = 36 ms

    etc. until t = 96 ms

  • Scenario for accumulation and compression (4/13)Bunch characteristics at injection in the compressorBunch characteristics at ejection to the targetR. Garoby @NuFact06

    Kinetic energy [GeV]5DETotal [MeV]10lbunch total [ns] at injection120Time interval between centres of consecutive bunches [ns]~ 354Time interval between transfers [ms]~ 12Duration of bunch rotation for 1 bunch [ms]~ 3 x 12Number of protons per bunches1.7 1013

    Kinetic energy [GeV]5DETotal [MeV]~ 170 MeVsbunch [ns] at ejection~ 2 nsTime interval between ejection [ms]~ 12Number of bunches6Duration of full burst to the target [ms]~ 60Number of protons per bunches1.7 1013

  • Focussing powercornecorne 2 (rflecteur)focalisation CNGS

  • Result of a geological survey:Very good rock quality3-4 shafts =70m (250k m3 each, fiducia