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Update time: 2009-07-21
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HIRFL-CSR, a new ion Cooler-Storage-Ring (CSR) project, is the post-acceleration system of the Heavy Ion Research Facility in Lanzhou (HIRFL). HIRFL-CSR is a multi-purpose CSR system that consists of a main ring (CSRm), an experimental ring (CSRe), and a radioactive beam line (RIBLL II) to connect the two rings. The two existing cyclotrons SFC (K = 69) and SSC (K = 450) of the HIRFL will be used as its injector system. The heavy ion beams with the energy range of 8–30 MeV/u from the HIRFL will be accumulated, cooled and accelerated to the high-energy range of 100–400 MeV/u in the main ring, and then extracted fast to produce RIB or highly charged heavy ions. The secondary beams (RIB or highly charged heavy ions) will be accepted and stored by the experimental ring for many internal-target experiments or high-precision spectroscopy with beam cooling. On the other hand, the beams with the energy range of 100–900 MeV/u will also be extracted from CSRm by using slow extraction or fast extraction for many external-target experiments.
Two electron coolers located in the long-straight sections of CSRm and CSRe, respectively, will be used for the beam accumulation and cooling. One internal target in the long-straight section of CSRe will be used for nuclear physics and highly charged state atomic physics, and many external targets of CSRm will be used for nuclear physics, cancer therapy study and other researches.

Major parameters of the CSR

 
CSRm
CSRe
Circumference (m)
161.00
128.80
Ion species
Stable nuclei: C–U, RIB(A<238)
Stable nuclei: C–U, RIB(A<238)
Max. energy (MeV/u)

900 (C6+), 400 (U72+)

600 (C6+), 400 (U90+)
Intensity (particles)
105–109 (stable nuclei)
103–109 (stable nuclei, RIB)
Time structure of beam
1 Pulse/cycle for fast extraction, 0.1–5 s for slow extraction
Quasi-continuous beam
Experiment mode
External target
Internal target
Bρmax (Tm)
10.64
8.40
Bmax (T)
1.4
1.4
Ramping rate (T/s)
0.1–0.4
0.1–0.4
Repeating circle (s)
~17 (~10 s for accumulation )
 
Acceptance
 
Normal mode
Ah (π mm mrad)
200 (ΔP/P= ±0.15%)
150 (ΔP/P= ±0.5%)
Av (π mm mrad)
30
75
ΔP=P (%)
1.25 (εh= 50 π mm mrad)
2.6 (εh= 10 π mm mrad)
e-Cooler
 
 
Ion energy (MeV/u)
8–50
25–400
Cooling length (m)
4.0
4.0
RF system
Acceleration
Accumulation
Capture
Harmonic number
1
16, 32, 64
1
fmin=fmax (MHz)
0.24/1.7
6.0/14.0
0.5/2.0
Voltages (n×kV)
1×7.0
1×20.0
2×10.0
Vacuum pressure (mbar)
6.0×10-11
 
6.0×10-11

Main Physics Goals at CSR:
1. Radioactive Ion Beam Physics
  · Nuclear structure of unstable nuclei
  · Isospin dependence nuclear matter
2. Meson-Nucleon Physics in Energy <1.1 GeV/u HI & <2.88GeV (3.7GeV/c) Proton
3. High Charge State of Atomic Physics
4. High Energy Density Matter
5. Applications
  · Astrophysics (Key Point)
  · *Irradiative Biology (Cancer Therapy)










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