JPARC一般化ー分布研究(可能性)

1、High Momentum Beamline at J-PARCShinya SawadaKEK (High Energy Accelerator Research Organization, Japan)Nov. 12, 20071Shinya Sawada RCNPIntroductionExamples of ExperimentsHigh Mass Dimuon (unpol)High Mass Dimuon (pol): Goto-sanPhi: YokkaichisanBeamline Overview and R&DNov. 12, 20072Shinya Sawada RCNP

2、Slow Extraction Beamline (Phase 1)NP-HALL56m(L)60m(W) 50-GeV PST1 Target 30% LossBeam Dump750kWSwitch YardA-LineT0 Target 0.5% LossSplit Point 2% LossPlan to extend the hall downstream (50m) in the Phase 2.Nov. 12, 20073Shinya Sawada RCNPBeamlines at the Hadron HallNov. 12, 20074Shinya Sawada RCNPWh

3、at is the High Momentum Beamline?Primary beams: proton (Phase 1), polarized proton and heavy ions (future) up to 51 GeV/c.Secondary beams: proton, pion, kaon, etc.The radiation shielding of the SY tunnel is designed so that 2% (15kW) loss allowed at SM1.Exp. setup could be staged.120mNov. 12, 20075S

4、hinya Sawada RCNPHadron PhysicsBeams of not only low momentum K/pi are indispensable to study QCD issues at J-PARC! Drell-Yan, J/Psi production structure at large x p, K scattering Hypernuclei formation via p, K beams Vector meson modification in matter Chiral perturbation theory via K decays Spectr

5、oscopy with p and K beamsNov. 12, 20076Shinya Sawada RCNPPhysics Possibilities of the High Momentum BeamlineHadron Physics Physics of QCDTwo Major Quests of QCDquark confinement and chiral symmetry breakingSubjects of Hadron Physics: attacking these quests from various aspects of view, at J-PARC.Had

6、ron spectroscopy: spectroscopy with pi/KMeson-baryon dynamics: chiral perturbation via K decays,Quark nuclear matterNuclear force: pi/K scattering, hypernuclear formation via pi/KNucleon structureExperiments to explore major hadron physics quests are possible at the high momentum beamline!vector mes

7、on modification in matter chiral symmetry restorationDrell-Yan and J/Psi production nucleon structure at large xNov. 12, 20077Shinya Sawada RCNPExamples of ExperimentsHigh Mass Dimuon Measurement1012/s protonstalk by Goto-san for the pol. partVector Meson Modification in Nuclei109-1010/s protonstalk

8、 by Yokkaichi-sanOther PossibilitiesGPD with pp p pi Delta ?talk by Sudoh-san at the Autumn JPS meeting“J-PARC一般化分布研究（可能性）軌道角運動量”Vector meson inside nucleustalk by Ozawa-sanHigh momentum kaon/pion?Nov. 12, 20078Shinya Sawada RCNPP04: Measurement of High-Mass Dimuon Production at the 50-GeV Proton Sy

9、nchrotronneeds 30 and 50 GeV, 1012 protons per sec.Nov. 12, 20079Shinya Sawada RCNPPhysics with High-Mass Dimuons at J-PARCNov. 12, 200710Shinya Sawada RCNPDimuon Spectrometer for FNAL E605/772/789/866p + p(d) +- x at 800 GeV/cTwo components in the +- spectrum:(a) Continuum: Drell-Yan process(b) Vec

10、tor mesons: J/, FNAL E866Nov. 12, 200711Shinya Sawada RCNPNov. 12, 200712Shinya Sawada RCNPNov. 12, 200713Shinya Sawada RCNPQuark Energy Loss with D-Y at 50 GeVFractional energy loss is larger at 50 GeVPossible to test the predicted L2-dependence from the A-dependence measurementGarvey and Peng, PRL

11、 90 (2003) 092302Nov. 12, 200714Shinya Sawada RCNPIssues raised by PACRelation with Fermilab E906?50GeV proton beam is not available.Shoji Nagamiya says that a 50-GeV proton may be available with slow ramping even without a flying-wheel generator, according to Prof. Yamazaki, the leader of the J-PAR

12、C accelerator group.What is a stage-1 approval?Nov. 12, 200715Shinya Sawada RCNPStatus of Fermilab E906Approved by Fermilab PAC in 2001Reviewed by Fermilab PAC again in October 2006, and the PAC again endorsed E906A technical review of E906 was held at Argonne National Lab in December 2006In June 20

13、07, US DOE/Office of Nuclear Physics decided to fund E906Construction of the coils for a new magnetConstruction/refurbishing the hodoscopes and tracking chambers Construction and installation will be completed by Fall of 2009E906 is scheduled to run for two years in 2009-2011Equipments would become

14、available in late 2011Nov. 12, 200716Shinya Sawada RCNPTheoretical Consideration by Yokoya-san“QCD correction to the Drell-Yan process at J-PARC energy”H. Yokoya (Niigata)第回J-PARC高物理月日KEK50GeV低Drell-Yan過程QCD表？pQCD予測？Summary by Yokoya-san: Drell-Yan process at the J-PARC energy, QCD correction is ver

15、y important, and higher-order corrections beyond NLO may be required.Resummation studies tell us, however, pQCD correction can be controlled by summing the large log terms. Power-corrections must become relevant, and needs more studies.Unpolarized PDFs (sea-quark, gluon) is still unknown, and have t

16、o be measured at the J-PARC experiments.Nov. 12, 200717Shinya Sawada RCNPE16: Electron pair spectrometer to explore the chiral symmetry in QCDstage-1 approvedneed 30 GeV, 109 1010 protons per sec.See Yokkaichis talk.Nov. 12, 200718Shinya Sawada RCNPIntroductionExamples of ExperimentsHigh Mass Dimuon

17、 (unpol)Beamline Overview and R&DNov. 12, 200719Shinya Sawada RCNPBeam Line Configuration & Optics ISecondary Beams:Use a thin (2% = 15kW loss) target at SM1Collect them at forward anglesTransfer them for 120mSchematic Layout around SM1:Shielding of the switching yard has been designed to accommodat

18、e the loss at SM1Nov. 12, 200720Shinya Sawada RCNPBeam Line Configuration & Optics IIBeam Optics: a preliminary design has been studied.Example: 10 GeV/c particlesBore radius of the quadrupole magnets is 10 cm or less.0.2 msr% can be achieved.Nov. 12, 200721Shinya Sawada RCNPYield Estimation (30GeV)

19、30GeV protons + 2% loss copper target. Production angle of 4 degree and (Dp/p)DW = 0.2msr%.Momentum(GeV/c)ds/dpdW(mb/sr/GeV/c)Yield at SM1(per 1014 protons)Yield at 120m(per 1014 protons)p+514003.7E72.4E7p+102101.1E78.9E6p-510002.6E71.7E7p-101306.7E65.4E6K+51303.3E61.3E5K+10281.4E62.8E5K-5611.6E66.4

20、E4K-107.03.6E57.2E4pbar5112.8E52.8E5pbar101.15.7E45.7E4Even with 30 GeV protons, enough intensity can be obtained especially for pions!Nov. 12, 200722Shinya Sawada RCNPYield Estimation (50GeV)50GeV protons + 2% loss copper target. Production angle of 4 degree and (Dp/p)DW = 0.2msr%.Momentum(GeV/c)ds

21、/dpdW(mb/sr/GeV/c)Yield at SM1(per 1014 protons)Yield at 120m(per 1014 protons)p+537009.5E76.2E7p+109304.7E73.8E7p-537009.5E76.2E7p-107003.6E72.9E7K+54401.1E74.4E5K+101206.2E61.2E6K-52205.7E62.3E5K-10562.9E65.8E5pbar5531.4E61.4E6pbar10168.4E58.4E5To get more intensity for higher momentum beams, extr

22、action at more forward angles can be considered.Nov. 12, 200723Shinya Sawada RCNPBeam Line Configuration & Optics IIIPrimary Beams: Beam line configuration is almost the same as the case for the secondary beams except for equipments at SM1. In order to cut a fraction (10 to 100 ppm) of the primary b

23、eam, a beam stealer can be used.1014 primary protons 109-1010 protonsField free holeNov. 12, 200724Shinya Sawada RCNPBeam Line Configuration & Optics IVIn order to get a few % of the primary beam, an electrostatic septum will be used.1014 primary protons 1012 protonsHigh heat and radiation deposit h

24、ave to be taken into account.More R&D works should be necessary to estimate the beam loss and to finalize the design.In order to get a fraction of the primary beam, a system with a bent crystal would be a good candidate.Nov. 12, 200725Shinya Sawada RCNPR&D for a bent crystal systemTest experiment at

25、 KEK-PS (12-GeV proton)ceramic plate(10 x10cm)CsI plate(5x2.5cm)goniometerbent crystalmain beamdeflected beamview from abovecrystaldeflectionangle12GeVprotons1012/s 107/sGrant-in-Aid for a next step R&D of high-mom beamline is being applied: Bent crystal, ESS, CrystalpCsI plate20 cmCeramic plateAl plateGoniometer o Ceramic platesDistance 145cmNov. 12, 200726Shinya Sawada RCNPCost & Schedule: Magnets from the WorldTotal cost if constructed from scratch: $5-8M?We have no budget so far to construct a high momentum beam line. But we are doing every effort to construct it with as small cost as