1. ExternalTargetFacility at CSR FRIB-China East Lansing 2015.5.28-30 Sun, Zhiyu Institute of Modern Physics, CAS

2. CSRe SFC (K=69) 10 AMeV (H.I.), 17~35 MeV (p) SSC(K=450) 100 AMeV (H.I.), 110 MeV (p) CSRm 1000 AMeV (H.I.),  2.8 GeV (p) Providing stable beams and RIBs with energies from MeV/u to GeV/u National Laboratory of Heavy Ion Accelerator in Lanzhou RIBLL1 RIBs at tens of AMeV RIBLL2 RIBs at hundreds of AMeV HIRFL (Heavy Ion Research Facility in Lanzhou) FRIB-China East Lansing 2015.5.28-30

3. HIRFL Research Programs Nuclear Physics – Nuclear spectroscopy – Super-Heavy Element (SHE) – Radioactive Ion Beam (RIB) physics – Reaction dynamics and nuclear matter Atomic Physics Material Science Radiation Biology and Medicine Accelerate and related technology Electronics and detector development FRIB-China East Lansing 2015.5.28-30

4. 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 RIBLL1 ⑤ RIBLL1 – 1st Radioactive Ion Beam Line in Lanzhou ETF ⑥⑧ ETF – External Target Facility at CSR ⑦ CSRe – Experimental Ring ⑨ Tumor therapy site HIRFL: Experiment Setups FRIB-China East Lansing 2015.5.28-30

5. CSRm Experiments at the CSR-ETF Study the structure of unstable nuclei through few-body reactions such as Coulex, Knock-out and break-up. Study the density and isospin dependence of the Equation of State (EOS) in the supra-saturation density RIB Physics Properties of Nuclear Matter FRIB-China East Lansing 2015.5.28-30

6. FRIB-China East Lansing 2015.5.28-30 Dipole  Array Tracking T0T0 Neutron Wall TOF Wall A multi-purpose setup measure charged particles,  s and neutrons at the same time completely kinematic measurement

7. σ(E)/E=3% σ(E)/E=2% σ(E)/E=1% 2.9° 2.0° 1.8° 1.6° 1.3° 1.2° 500MeV/u FRIB-China East Lansing 2015.5.28-30 Material: CsI(Tl) Coverage ： 6°~129.2° Module number: 4608 Volume (Crystal) ： 226,762 cm 3 Weight (Crystal) ： 1,021 kg Measure  rays up to 15 MeV Large coverage Good efficiency Good energy resolution Good Doppler correction The CsI  Detector Array

8. For the 1 st stage, the end-cup has been constructed. coverage ： 15.6°~36.4° Module number ： 1024 Volume (Crystal) ： 44,177 cm3 Weight (Crystal) ： 200 kg 700MeV/u 500MeV/u 300MeV/u 100MeV/u 50MeV/u 700MeV/u 500MeV/u 300MeV/u 100MeV/u 50MeV/u 6°6° 36.4 ° 129.2° 15.6° FRIB-China East Lansing 2015.5.28-30

9. G=3.29% FRIB-China East Lansing 2015.5.28-30 Readout with APD (Hamamatsu S8664-1010) 137 Cs （ 662keV ） Homogeneity

10. Electronics FRIB-China East Lansing 2015.5.28-30 ASIC chip MATE3

11. simulation measurement backscattering peak FRIB-China East Lansing 2015.5.28-30 Coverage ： 6.0 %×4π E （ MeV ） EfficiencyTotal absorbtion 1.1799.5%64.8% 1.3398.5%61.3% Efficiency for the  rays within the coverage(simulation) ： Still working on the spectrum reconstruction process now, will do calibration and compare with the simulation after this. FWHM ≈ 8% 60 Co

12. FRIB-China East Lansing 2015.5.28-30 Pole gap: 27 cm Effective length: 1 m Max. Field: 1.5 T The Dipole Magnet

13. The TOF Wall Detector Get the momentum of charged particles by the time of flight measurements Active area1.2 × 1.2m 2 Time resolution(σ)150 ps 30 modules in one layer FRIB-China East Lansing 2015.5.28-30 Readout from both sides by PMT

14. Module Performance with cosmic rays The charge obtained from one PMT will vary for 300% while the hit position moves The average has less dependence on hit position The effective velocity of light transfer is about 15 cm/ns, leading to a position resolution of about 2 cm (σ) FRIB-China East Lansing 2015.5.28-30

15. FRIB-China East Lansing 2015.5.28-30 Time resolution: σ~70 ps (corrected, center position) Time resolution(σ) is better than 150 ps （ LED after correction ） test with 100 MeV/u 12 C beam test with cosmic rays

16. Timing measured by HPTDC in the high- resolution mode (25ps), Charge measured by TOT method with a resolution of 5% Electronics FRIB-China East Lansing 2015.5.28-30

17. The MWDC Detectors FRIB-China East Lansing 2015.5.28-30 Active size96×50 cm 2 80×60 cm 2 48×32 cm 2 Quantity151 Wires readout576480288 Position resolution (σ)~260 μm~230 μm~200 μm Efficiency (MIPs)>95%

18. SFE16 as pre-amplifier and LED Timing measured by HPTDC in the normal-resolution mode (100ps) Charge measured by TOT method 128 channels/board FRIB-China East Lansing 2015.5.28-30 85 ％ Ar ＋ 15 ％ CO 2

19. neutron energy range ： tens MeV ～ GeV time of flight method high efficiency good momentum resolution large coverage good positon resolution 150 MeV Neutron Wall detector FRIB-China East Lansing 2015.5.28-30

20.  14Layers, 18Modules/Layer  The first 2 layers consists of plastic scintillator only  Other 12 layers are scintillator+iron configuration  Consists of 76cm scintillator and 24cm iron totally  Read-out from both ends of every module by PMT  Coupled with a veto detector consists of 1cm plastic scintillator FRIB-China East Lansing 2015.5.28-30  Active volume: 1.5×1.5×1m 3  Distance to target: 14 m  Energy resolution: 5% (1GeV)

21. Module performance (cosmic rays) FRIB-China East Lansing 2015.5.28-30 Scintillator module Scintillator+iron module

22. Module performance (beam) Beam ： 100 MeV/u 12 C 6+ Target ： Fe （ 8 mm ） Flight length ： 1 m FRIB-China East Lansing 2015.5.28-30 VETO ： 150cm×8cm×1cm Module tested 100 MeV/u 12 C 6+ Pb

23. FRIB-China East Lansing 2015.5.28-30 Time resolution for the scintillator module: 50ps for charged particles and 230ps for neutrons Charged Particles Neutrons Time resolution for the scintillator+iron module: 120ps for charged particles and 350ps for neutrons

24. N CSRm CSRe SFC SSC 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) CSR External Target Experiment FRIB-China East Lansing 2015.5.28-30 Spokespersons: Prof. Xu Nu Xiao Guo-Qing Study the properties of nuclear matter at CSR

25. CEE (CSR External Target Experiment) CEE (CSR External Target Experiment) FRIB-China East Lansing 2015.5.28-30 Momentum resolution<5% Time resolution<70 ps Event rate10 3 ~10 4 /s Date taken~500MB/s CEE: 1)Extreme high baryon density and low temperature region 2)Strong hadronic interactions CEE: 1)Extreme high baryon density and low temperature region 2)Strong hadronic interactions Net baryon density

26. Target MWDC TOFW Big Dipole Beam π—π— π+π+ p Can we work with the existing setup? Start FRIB-China East Lansing 2015.5.28-30

27. p/Z (MeV/c) m/Z (MeV/c 2 ) Target MWPC TOFW Big Dipole Start Beam π—π— π+π+ p B= 0.27 Tesla π—π— π+π+ p B= - 0.27 Tesla FRIB-China East Lansing 2015.5.28-30 proton π+π+ π-π- E lab =200AMeV E lab =600AMeV

28. Summary The experiments at CSR-ETF will focus on the RIB physics and the properties of dense nuclear matter A multi-purpose setup is under-construction at the CSR-ETF for RIB physics, and the detectors are nearly ready for commissioning. Need more hard works to make the new CEE spectrometer approved, and we can use the setup for RIB physics to start the work on EOS at the same time. FRIB-China East Lansing 2015.5.28-30