IMP's activities in COSY programs and the extension to HPLUS
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1 2nd Beijing, July 2010 IMP's activities in COSY programs and the extension to HPLUS Xiaohua Yuan Institute of Modern Physics (IMP) - CAS, Lanzhou & Institut für Kernphysik, Forschungszentrum Jülich
2 Outline Introduction to HIRFL Beam facilities Experimental sites Introduction to COSY Beam facility Experimental sites Physics on COSY and the extension to CSR ANKE, WASA, PISA PISA, HPLUS Recent plans on CSR Summary & Future Development Xiaohua Yuan 28 July 2
3 RIBLL1 RIBLL2 Introduction to HIRFL: Beam facilities SSC SFC SFC: 10 AMeV (H.I.), 17~35 MeV (p) SSC: 100 AMeV (H.I.), 110 MeV (p) CSRm: 1000 AMeV (H.I.), 2.8 GeV (p) N CSRe CSRm RIBLL1: RIBs at tens of AMeV RIBLL2: RIBs at hundreds of AMeV CSRe: storage ring with deceleration Xiaohua Yuan 28 July WHAT2010@Beijing 3
4 Introduction to HIRFL: Exp. Sites 1 Low energy site in general 2 Atomic physics exp. site 3 SHANS - Spectrometer for Heavy Atom and Nuclear Structure 4 Heavy ion irradiation exp. site 5 RIBLL1 1st Radioactive Ion Beam Line in Lanzhou HPLUS 10 6 ETF External Target Facility at CSR 7 CSRe Experimental Ring 8 PISA Proton Induced SpAllation 9 Tumor therapy site 10 HPLUS Hadron Physics LanzhoU Spectrometer Xiaohua Yuan 28 July WHAT2010@Beijing 4
5 Introduction to COoler SYnchrotron (Polarized) p & d beams WASA ANKE Electron & stochastic cooling Beam momentum: GeV/c pp pp X (m X 1.1 GeV/c 2 ) PAX p, d PISA 10 m dd 4 He X (m X 1.03 GeV/c 2 ) TOF ~ 340 users, 15 countries Xiaohua Yuan 28 July WHAT2010@Beijing 5
6 WASA and ANKE WASA ANKE Almost 4p coverage Charged and neutral particle detection Frozen-pellet target (L ~ cm -2 s -1 ) Forward spectrometer Excellent K + /K i.d. Cluster-jet target (L ~ few cm -2 s -1 ) Polarized target Xiaohua Yuan 28 July WHAT2010@Beijing 6
7 total cross section, nb p/d-induced KK production: World data set pp ppk + K pp dk + K 0 pn dk + K pd 3 HeK + K dd 4 HeK + K test for dd f 0 (980) a 0 (980) p 0 h (on WASA) I = 0 I = 1 I = 1 K + K ( isospin filter ) I = 0 isospin violation!! - COSY ANKE, COSY-11, MOMO - DISTO Excess energy, MeV Xiaohua Yuan 28 July WHAT2010@Beijing 7
8 d d 4 He K + K X.Yuan et al., EPJ A in print DOI /epja/i arxiv: [nucl-ex] x 10 11!! ~ 5 events 5 pb cross section for the isospin filter dd 4 HeX is extremely small (J/y ff 0 fa 0 f(p 0 h) ) Xiaohua Yuan 28 July WHAT2010@Beijing 8
9 pd 3 He GeV/c pd 3 He a He p 0 h 3 He 4g pd 3 He f 0 3 He p 0 p 0 3 He 4g g g 3 He g g Xiaohua Yuan 28 July WHAT2010@Beijing 9
10 total x-section, nb Summary of total x-sections for pd 3 He GeV/c [p + p - p 0 ] [p 0 g] upper limit (2s) w(782) a 0 0 /f 0 (980) [p 0 h / p 0 p 0 ] f(1020) h (958) Mx, GeV/c 2 Xiaohua Yuan 28 July WHAT2010@Beijing 10
11 PISA Identification for Charged Particles, E<15 MeV Energy distribution Charge distribution Spatial distribution Double differential cross sections BCD NIM A 519(2004) Under development Detectors for E<15 MeV Neutrons Energy distribution Production cross sections Cooled-Si PHD Thesis Wuppertal University(2004) Xiaohua Yuan 28 July WHAT2010@Beijing 11
12 PISA ADS Running as an external target exp. at the end of Mainly focusing on the requirements from the applications (p+pb, p+bi). Measuring total and differential cross sections of spallation process Measuring the spectra of LCP, extracting the excitation energy, and comparing with model calculations Measuring neutron multiplicity and energy distributions Xiaohua Yuan 28 July 12
13 PISA tumor therapy Precise information The movement of C ions; The production cross sections, energy distribution, spatial distribution of other ejectiles i.e. light charged particles or fragments, neutrons, g. Xiaohua Yuan 28 July WHAT2010@Beijing 13
14 HPLUS Hadron Physics LanzhoU Spectrometer Hadron Physics at GeV energies Xiaohua Yuan 28 July 14
15 E_IC CsI crystals IMP has developed the techniques to produce CsI scintillator cm 3 samples,apd readout cm 3 samples,pd readout Ni Co Fe Mn Cr V Ti 57 Ni Xiaohua Yuan 28 July WHAT2010@Beijing E_CsI 15
16 EMC prototype The MC simulation is assisting in optimizing the performance of both the full calorimeter and the individual modules. The shape, wrapping and the readout of the individual module have been fixed. Xiaohua Yuan 28 July 16
17 Configuration of Micromegas detector mesh structure oscilloscope 5.9 kev X-ray energy resolution test platform time resolution position resolution Xiaohua Yuan 28 July 17
18 Pellet target for HPLUS speed:60 90 m/s, diameter:35 m Luminosity: cm -2 s -1 Cold head, coordination system; Monitoring system, thermal exchange system, vacuum system. Xiaohua Yuan 28 July WHAT2010@Beijing 18
19 Laser-driven polarized hydrogen target A laser-driven polarized hydrogen target will be transplanted from DUKE to IMP. B. Clasie, H. Gao et al. Phy. Rev. A 73, R 2006 It provides a possibility to carry out the spin physics study at CSR. Xiaohua Yuan 28 July WHAT2010@Beijing 19
20 Luminosity Determination Proton beam tuning First time beam tuning in CSRm in 2010, 1 GeV. 2.8 GeV in the future Trigger conditions for selecting elastic events, red curve: trigger rate blue curve: DAQ rate A monitor for the effective luminosity is needed because the beam conditions are not constant. 1. beam envelop position & distribution; 2. beam intensity attenuation. Xiaohua Yuan 28 July WHAT2010@Beijing 20
21 Luminosity Determination Eur. Phys. J. A 22(2004)125 Proton beam tuning First time beam tuning in CSRm in 2010, 1 GeV. 2.8 GeV in the future Proton - proton elastic A monitor for the effective luminosity is needed because the beam conditions are not constant. 1. beam envelop position & distribution; 2. beam intensity attenuation. HPLUS, Hadronic physics study Xiaohua Yuan 28 July WHAT2010@Beijing 21
22 Recent Plan Budget Stratagem before the budget available HPLUS simulation, key tech. R&Ds, physics preparation Proton beam from CSR, CSR upgrade accordingly Pellet target platform construction / LDPT Simple experiment Adding the detectors step by step Budget close to 200 million Chinese Yuan needed! Xiaohua Yuan 28 July WHAT2010@Beijing 22
23 Future Plan Xiaohua Yuan 28 July 23
24 Thank you for your attention! Xiaohua Yuan 28 July 24
25 Spare foils Xiaohua Yuan 28 July 25
26 Tools: COoler SYnchrotron COSY-Jülich Xiaohua Yuan 28 July 26
27 WASA - Wide Angle Shower Apparatus Xiaohua Yuan 28 July WHAT2010@Beijing 27
28 ANKE Apparatus for detection of Nucleon and Kaon Ejectiles Xiaohua Yuan 28 July 28
29 PISA nn scattering cross section at CSR energies L-G phase transition of nuclear matter Spallation process: measuring the spectra of LCP, extracting the excitation energy, and comparing with model calculations mainly focusing on the requirements from the applications Comparison of R AA & R pa at CSR energies as a part of the energy scanning from RHIC energy down to CSR energy Nucl. Instr. & Methods A 519 (2004) Shipped from FZJ to IMP in 2008 Running as an external target exp. in the end of Xiaohua Yuan 28 July WHAT2010@Beijing 29
30 CSB amplitude a 00 (980) f 0 (980) mixing: Kaon loops Enhanced mixing by Kaon loops p 0 a 0 h K + f 0 a 0 K 0 L = - f 0 a 0 g f0 KK g a0 KK g f0 KK g a0 KK K K 0 _ f 0 m K + + m K - 2m K 0 d d 8 MeV (Product of mixing amplitude L and f 0 production operator) 2 normal IV o(1%) N.N.Achasov et al., PL B 88, 367 (1979) Xiaohua Yuan 28 July WHAT2010@Beijing 30
31 a 00 (980) f 0 (980) mixing: Kaon loops Plan for WASA/COSY: dd f 0 (980) a 0 (980) p h Isospin violation Isospin: Possible BES: J/ f 0 (980) a 0 (980) p h L 2 s tot (dd f 0 ) [N.N. Achasov et al., Phys. Lett. B 88 (1979) 367] f 0 a 0 s (dd f 0 (980)) is not known! g f0kk f 0 g a0kk a 0 dd f 0 (980) K + K - can be measured at ANKE/COSY! s (dd K + K - ) 0.4 nb (estimate, 2003) Xiaohua Yuan 28 July WHAT2010@Beijing 31
32 Internal targets at COSY Condensation point Skimmer Cooled Laval nozzle Virtual target point Operation principle: Focussing and defocussing of hydrogen or deuterium hyperfine states Cluster jet Pellet Polarized (ABS) Xiaohua Yuan 28 July 32
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