Nufact RAL and CERN p-drivers

Click here to load reader

  • date post

    19-Jan-2016
  • Category

    Documents

  • view

    36
  • download

    0

Embed Size (px)

description

Nufact RAL and CERN p-drivers. S. Gilardoni – CERN Based on contributions from: J. Thomason, ISIS Accelerator Division M. Aiba , E. Benedetto, R. Garoby and M. Meddahi, CERN. Multi-MW p-driver. Basic requirements: 4 MW power on target Energy between 5 – 15 GeV RMS bunch length 1 – 3 ns - PowerPoint PPT Presentation

Transcript of Nufact RAL and CERN p-drivers

PowerPoint Presentation

NufactRAL and CERN p-driversS. Gilardoni CERN

Based on contributions from:

J. Thomason, ISIS Accelerator DivisionM. Aiba, E. Benedetto, R. Garoby and M. Meddahi, CERN

Multi-MW p-driver

Basic requirements:

4 MW power on targetEnergy between 5 15 GeVRMS bunch length 1 3 ns50 Hz rep. rate.3 bunches, spaced by more than 80 sUK Green Field Solution

Proton Driver for a Neutrino FactoryChris Prior, Grahame Rees,Shinji Machida ( )

10 GeV RCS Separate main ring with optics chosen for ns bunch compression. Could be FFAG (cheaper but insufficiently developed) or a synchrotron (reliable, tried and tested) Compressed bunches need to be held and sent totarget at intervals of ~100s. Possible in FFAG and also synchrotron with flat top Separate booster ring designed for low loss phase space painting for beam injection and accumulation. Synchrotron moving buckets give flexibility to capture all of the injected beam Special achromat for collimation (longitudinal and transverse) and momentum ramping for injection Lower injection energies provide smaller bucket area in the ring and the small longitudinal emittance needed for final ns bunch compression. Studies show that 180 MeV is a realistic energy for NF4ISIS Upgrade + NF Solution

ISIS Upgrades Present operations for two target stationsOperational Intensities: 220 230 A (185 kW)Experimental Intensities of 31013 ppp (equiv. 240 A)DHRF operating well: High Intensity & Low LossNow looking at overall high intensity optimisation

Study ISIS upgrade scenarios

4) Upgrade 3) + long pulse mode option0) Linac and TS1 refurbishment1) Linac upgrade leading to ~0.5 MW operations on TS12) ~3.3 GeV booster synchrotron: MW Target3) 800 MeV direct injections to booster synchrotron: 2 5 MW TargetOverlap with NFproton driver62) Based on a 3.3 GeV RCS fed by bucket-to-bucket transfer from ISIS 800 MeV synchrotron (1MW, perhaps more) 3) RCS design also accommodates multi-turn charge exchange injection to facilitate a further upgrade path where the RCS is fed directly from an 800 MeV linac (2 5 MW) 1) Replace ISIS linac witha new 180 MeV linac( 0.5MW) ISIS MW Upgrade Scenarios

72) Based on a 3.3 GeV RCS fed by bucket-to-bucket transfer from ISIS 800 MeV synchrotron (1MW, perhaps more) 3) RCS design also accommodates multi-turn charge exchange injection to facilitate a further upgrade path where the RCS is fed directly from an 800 MeV linac (2 5 MW) 1) Replace ISIS linac witha new 180 MeV linac( 0.5MW) ISIS MW Upgrade Scenarios

8

Possible 3.3 GeV RCS Rings 9

Energy0.8 3.2 GeVRep Rate50 HzC, R/R0367.6 m, 9/4Gamma-T7.2h9frf sweep6.1-7.1 MHzPeak Vrf 750 kVPeak Ksc 0.1l per bunch 1.5 eV sB[t]sinusoidal5SP RCS Ring 102) Based on a 3.3 GeV RCS fed by bucket-to-bucket transfer from ISIS 800 MeV synchrotron (1MW, perhaps more) 3) RCS design also accommodates multi-turn charge exchange injection to facilitate a further upgrade path where the RCS is fed directly from an 800 MeV linac (2 5 MW) 1) Replace ISIS linac witha new 180 MeV linac ( 0.5MW) ISIS MW Upgrade Scenarios

11800 MeV, H Linac Design ParametersGrahame Rees,Ciprian Plostinar ( )

Ion SpeciesH-Output Energy800 MeVAccelerating StructuresDTL/SC Elliptical CavitiesFrequency324/648 MHzBeam Current43 mARepetition Rate30 Hz (Upgradeable to 50 )Pulse Length0.75 msDuty Cycle2.25 %Average Beam Power0.5 MWTotal Linac Length243 m12Design Options

13Common Proton Driver for the Neutron Sourceand the Neutrino Factory

Based on MW ISIS upgrade with 800 MeV Linac and 3.2 ( 3.3) GeV RCS

Assumes a sharing of the beam power at 3.2 GeV between the two facilities Both facilities can have the same ion source, RFQ, chopper, linac, H injection, accumulation and acceleration to 3.2 GeV Requires additional RCS machine in order to meet the power and energy needs of the Neutrino Factory Options for the bunch compression to 1 3 ns RMS bunch length: - adiabatic compression in the RCS - fast phase rotation in the RCS - fast phase rotation in a dedicated compressor ring

Number of superperiods6Circumference694.352 mHarmonic number17RF frequency7.149 7.311 MHzGamma transition13.37Beam power at 9.6 GeV4 MW for 3 bunchesInjection energy3.2 GeVExtraction energy9.6 GeVPeak RF voltage per turn 3.7 MWRepetition rate50 HzMax B field in dipoles 1.2 TLength of long drift14 m Present-day, cost-effective RCS technology Only three quadrupole families Allows a flexible choice of gamma transition Up to 3.7 MV/turn?Parameters of 3.2 9.6 GeV RCSPreliminary design of the second RCSJaroslaw Pasternak, Leo Jenner( , , )

SPL-Based NF Proton Driver

Nearly Green Field SolutionLP-SPL: Low Power-Superconducting Proton Linac (4 GeV)Main requirements of PS2 on its injector:RequirementParameterValue2.2 x ultimate brightness with nominal emittancesInjection energy4 GeVNb. of protons / cycle for LHC (180 bunches)6.7 1013Single pulse filling of SPS for fixed target physicsNb. of protons / cycle for SPS fixed target1.1 1014HP-SPL: Upgrade of infrastructure (cooling water, electricity, cryogenics etc.)

Replacement of klystron power supplies Addition of 5 high b cryomodules to accelerate up to 5 GeVBack-upPSBSPSLinac4LP-SPLPSLHC / sLHCOutput energy160 MeV1.4 GeV4 GeV26 GeV50 GeV450 GeV7 TeVLinac250 MeVProton flux / Beam powerPS2PresentLinac4PSBPS2.0 GeVLIU (2019)17

SPL-Based Proton Driver: Principle

Accumulation of beam from the High Power SPL in a fixed energy Accumulator (5 GeV, 4MW beam power).Bunch compression (rotation) in a separate Compressor ringCCDTLPIMS3MeV50MeV94MeV160MeVDrift TubeLinac

18.7 m3 tanks3 klystrons4.7 MW111 PMQsPi-Mode Structure

22 m12 tanks8 klystrons~12 MW12 EMQuadsCell-Coupled Drift TubeLinac25 m21 tanks7 klystrons7 MW21 EMQuadsRF accelerating structures: 4 types (RFQ, DTL, CCDTL, PIMS)Frequency: 352.2 MHzDuty cycle: 0.1% phase 1 (Linac4), 3-4% phase 2 (SPL), (design: 10%)Linac4: 80 m, 18 klystronsIon current:40 mA (avg.),65 mA (peak)CHOPPERRFQChopper & Bunchers3.6 m11 EMquad3 cavitiesRadio FrequencyQuadrupole3 m1 Klystron550 kWH-3MeV45keVRF volumesource(DESY)45 kVExtrac.DTLSPL front end (Linac4): block diagram

First userLinac4 building Oct 2010

Linac4 Mar 2011Option 1Option 2Energy (GeV)2.5 or 52.5 and 5Beam power (MW)

2.25 MW (2.5 GeV)or4.5 MW (5 GeV)5 MW (2.5 GeV)and4 MW (5 GeV)Protons/pulse (x 1014)1.12 (2.5 GeV) + 1 (5 GeV)Av. Pulse current (mA)2040Pulse duration (ms) 0.91 (2.5 GeV) + 0.4 (5 GeV)2 beam current 2 nb. of klystrons etc .Ion speciesHOutput Energy5GeVBunch Frequency352.2MHzRepetition Rate50 HzHigh speed chopper< 2 ns(rise & fall times)Required for muon productionRequired for flexibility and low loss in accumulatorRequired for low loss in accumulatorHP-SPL: Main CharacteristicsMedium b cryomoduleHigh b cryomodulesEjection9 x 6b=0.65 cavities11 x 8b=1 cavities 13 x 8b=1 cavitiestoEURISOLDebunchersTo HP-PS and/or AccumulatorHigh b cryomodulesFrom Linac40 m0.16 GeV110 m0.73 GeV291 m2.5 GeV500 m5 GeV

Segmented cryogenics / separate cryo-line / room temperature quadrupoles:Medium b (0.65) 3 cavities / cryomoduleHigh b (1) 8 cavities / cryomodule

Low energyIntermediate energyHigh energyHP-SPL: Block DiagramDesign, construction and test of a string of 4 b=1 cavities equipped with main couplers & tuners inside a short prototype cryo-module before the end of 2014 tested in 2014.

Cryomodule(CERN CNRS)HP-SPL: R&D ObjectiveSPL b = 1 cavity + helium tank + tuner + main coupler

Bulk niobium cavities (CERN)Main coupler (CERN)HOM coupler (CERN Uni Rostock)Tuner (CEA)Helium tank(CERN CEA)HP-SPL: Cavity & Cryomodule DesignAccumulator/compressor lattices

from M. AibaHP-SPL cost estimate - sLHC-Project-Note-0037 (F. Gerigk, CERN-BE-RF, public)

Cost estimate : 806.9 MCHFVery detailed Include services, tunnels, L4 upgrade, even T-line to PS2Does not include contingency Does not include Linac4 (~100 MCHF)HP-SPL: Cost Estimate (1/3/12)