Commission of CSR in Lanzhou

Commission of CSR in Lanzhou Wenlong Zhan and CSR Group Institute of Modern Physics, CAS

•Introduction •Improvement of Injection Beam •CSRm Commission •RIBLL2 & CSRe Commission •Conclusion

Oct. 3

HIRFL Layout 9.6 Tm 500AMev U92+

• ECR Ion Source • SFC K~70--10AMev • SSC K=450 –100AMev 12.16 Tm

10AMev

100AMev

1100AMev 12C 520AMev U72+

•CSRm cooler synchrotron • CSRe: Accel. & Deccel. And High Sensitive & Accuracy (~10-6) Spectrometer

HIRFL Main Performances SFC

SSC

E(MeV) C(MeV/u) U(MeV/u)

Proton, HI K=70 >10 0.8(Q=26)

Proton, HI Proton, HI, Proton, HI, RIB? RIB, HCI K=450 P=2880 P=2000 ~100 1100 760 11(Q=40) 520(Q=72) 500(Q>90)

∆P/P

~10-2

~10-3

Species

δP/P (%) (entrance) Emmitance >50π (mm-mrad)

~20 π

CSRm

CSRe

~10-4

~10-5

±0.15

±0.25~0.5

•5 π

•1 π

Main Physics Goals at HIRFL-CSR ØNuclear Structure (RIB) ØEOS of Nuclear Matter ØHadrons-Nucleon Physics in E 1puA 20π mm-mrad •P/P < ± 0.15% Switching Top: 1~5ms

Collimating

Stripping Injection at CSRm BumpPS

m a e B

2900A, 8600G

20~400µs 3200A 1600V

Beam Accumulation with e-cooing in CSRm Iinj=10.2µA, Beam current: 3200•A, 1.6×1010, 8min., Gain=300

8 min

06/12/29 5:00

E-cooing for

C6+-beam

06/12/27 08:15

at 7MeV/A

•P/P 4× 10-3 ↓ ↓ ↓

2× 10-4

PS & RF Ramping

06/10/15 22:45

7•1000MeV/u Ramping Test, H = 2(4)•1, frf = 0.45• 1.63MHz

06/7/29 17:22

A Bunch C6+ Beam Accumulation at CSRm Gain = 30

DCCT Res.: 1µA

220µA~109

07/09/29 6:25

Stripping+ E_CooingAccumulation + Acceleration at CSRm 12C~7×109

ppp, & 600MeV/u

18 time Injection for 0.5Sec. Cooling/bunch

Lifetime of C6+ beam in CSRm with e-cooling SFC-12C4+-7MeV/u, STI , 1/e Life-time = 1088s

07/09/10 09:04

CSRm β & • Measurement

Emittance:

Ex(5•)n 1.6•mm.mrad

07/09/11-12

Ey(5•)n 1•mm.mrad

Scheme of MMI of Ar Test at CSRm 36Ar8+-

2 MeV/u Peak>10uA ECR

36Ar8+-

22 MeV/u Peak>3.5uA

Ar8+

Ar18+

Stripper

MMI-36Ar18+

MMI Injection at CSRm 20007.03

Bump-PS Orbits of the Multiple MultiMulti-turn Injection

• 0.1mm

Septum (Wolfram silk)

m Bea L=2m Vmax .= 160 kV Gap=23mm Static--electric septum Static

CSRm MMI (36Ar18+--22~1000MeV/u) 07/04/29 16:00

650uA

MMI+E_Cool+Acc. 36Ar~1.4×108ppp & 1000Mev/u 0.35 /Cooling

MMI+Acc. (129Xe27+ 2.9-235MeV/u) 07/06/25 07:20

500uA, 1×108, •=83%

2.86 à 235MeV/u & >1×108ppp SECRALà SFCà CSRm(MMI+E_Cool+Acc.) Extract 129Xe27+

RIBLLII

External Target II

Primary Target

CSRe Side View 300kV Electron Cooler

Gas Jet Target H2 >1×1013/cm 2 N2 2×1013/cm2 Ne ~2×1013/cm 2 Ar 7×1013/cm2

07/08/30 07:00

30BPM4 RIBLL2

30FC4

PT

30VS4

Features of CSR

1, new Generation E_Cooler:halo E-beamàhigh Accum. 2, RIB reaction Exp. at CSRe 3, 10-12mbar UHV 4, Web+Internet+DB Control 5, Flexible Lattice by control Q_ps individually

Summary • SECRAL provide higher intensity of HCI online • Injection beam intensity – SFC: 1012~1013pps; – SSC: 1011 ~1012 pps for A