External Target Facility at CSR
FRIB-China East Lansing 2015.5.28-30
Sun, Zhiyu
Institute of Modern Physics, CAS
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
RIBLL1RIBs at tens of AMeV
RIBLL2RIBs at hundreds of AMeV
HIRFL(Heavy Ion Research Facility in Lanzhou)
FRIB-China East Lansing 2015.5.28-30
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
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
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
SFC
TR5
TR3TR4
TR2
TR1
TL2
TL1
SSC PDC
T1
RIBLL1
RIBLL2
PT
CSR
m
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
FRIB-China East Lansing 2015.5.28-30
Dipole
Array
Tracking T0
Neutron Wall
TOF Wall
• A multi-purpose setup• measure charged particles, gs and
neutrons at the same time• completely kinematic measurement
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: 4608Volume (Crystal) : 226,762 cm3
Weight (Crystal) : 1,021 kg
Measure g rays up to 15 MeVLarge coverageGood efficiencyGood energy resolutionGood Doppler correction
The CsI g Detector Array
For the 1st stage, the end-cup has been constructed.coverage : 15.6°~36.4°Module number : 1024Volume (Crystal) : 44,177 cm3Weight (Crystal) : 200 kg
700MeV/u500MeV/u300MeV/u100MeV/u50MeV/u
700MeV/u500MeV/u300MeV/u100MeV/u50MeV/u
6° 36.4°
129.2°15.6°
FRIB-China East Lansing 2015.5.28-30
G=3.29%
FRIB-China East Lansing 2015.5.28-30
Readout with APD(Hamamatsu S8664-1010)
137Cs ( 662keV )Homogeneit
y
Electronics
FRIB-China East Lansing 2015.5.28-30
ASIC chip MATE3
simulation
measurement
backscattering peak
FRIB-China East Lansing 2015.5.28-30
Coverage : 6.0 %×4π
E( MeV)
Efficiency Total absorbtion
1.17 99.5% 64.8%
1.33 98.5% 61.3%
Efficiency for the g 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%60Co
FRIB-China East Lansing 2015.5.28-30
Pole gap: 27 cmEffective length: 1 mMax. Field: 1.5 T
The Dipole Magnet
The TOF Wall Detector
Get the momentum of charged particles by the time of flight measurements
Active area 1.2×1.2m2
Time resolution(σ)
150 ps30 modules in one layer
FRIB-China East Lansing 2015.5.28-30
Readout from both sides by PMT
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
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 12C beam
test with cosmic rays
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
The MWDC Detectors
FRIB-China East Lansing 2015.5.28-30
Active size 96×50 cm2 80×60 cm2 48×32 cm2
Quantity 1 5 1
Wires readout 576 480 288
Position resolution (σ) ~260 μm ~230 μm ~200 μm
Efficiency (MIPs) >95% >95% >95%
• 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 % CO2
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
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: 1.5×1.5×1m3
Distance to target: 14 m
Energy resolution: 5% (1GeV)
Module performance (cosmic rays)
FRIB-China East Lansing 2015.5.28-30
Scintillator module Scintillator+iron module
Module performance (beam)
Beam : 100 MeV/u 12C6+
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 12C6+ Pb
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
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
CEE (CSR External Target Experiment)
FRIB-China East Lansing 2015.5.28-30
Momentum resolution <5%
Time resolution <70 ps
Event rate 103~104/s
Date taken ~500MB/s
CEE:1) Extreme high baryon density
and low temperature region2)Strong hadronic interactions
Net baryon density
Target
MWDC
TOFW
Big Dipole
Beam
π—
π+p
Can we work with the existing setup?
Start
FRIB-China East Lansing 2015.5.28-30
p/Z (MeV/c)m
/Z (
MeV
/c2 )
Target
MWPC
TOFW
Big Dipole
Start
Beam
π—π+p
B= 0.27 Tesla
π— π+p
B= - 0.27 Tesla
FRIB-China East Lansing 2015.5.28-30
proton
π+
π-
Elab=200AMeV
Elab=600AMeV
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
Thank!