C.K. Gelbke, March 2012, KoRIA Team Visit, Slide 1
The Design and Commissioning of the Accelerator System of the Rare Isotope
Re-accelerator - ReA3Xiaoyu WuNSCL/FRIB
Michigan State University
On Behalf of the ReA3 Team
X. Wu, September 18, 2012, HB2012, Slide 2
NSCL and FRIB Laboratory at Michigan State University
• NSCL is funded by the U.S. National Science Foundation as a user facility to produce rare isotope beams for research and education in nuclear science, nuclear astrophysics, accelerator physics, and societal applications
• FRIB, currently being designed and established at MSU, will be a national user facility funded by the U.S. Department of Energy Office of Science
• NSCL will transition into FRIB eventually
X. Wu, September 18, 2012, HB2012, Slide 3
Rare Isotope Beam Productions by Projectile Fragmentation
• Modest beam quality and high beam energy(E/A ~ 100 MeV/u)
• Suitable for short-lived isotopes (τ > 10-6 s)
• Physical method of separation, no chemistry
• High quality, low-energy beams are difficult (emittance too large)
X. Wu, September 18, 2012, HB2012, Slide 4
Strong Demands for High Quality, Low-Energy RIBs
• Nuclear astrophysics – Better interpretation of X-ray bursts and novae observations– Origin of p-nuclei– Supernovae modeling
• High quality low energy RIBs allow:– Reaction measurements at astrophysical energies– Indirect techniques to obtain astrophysical rates
• Nuclear physics – Shell structure evolution away from stability– Understanding pairing, shapes, cluster structure and collectivity of exotic nuclei– Reaction of exotic nuclei
• High quality low energy RIBs allow:– Transfer reactions– Multi-step Coulomb excitation– Fusion evaporation reactions
X. Wu, September 18, 2012, HB2012, Slide 5
Current NSCL Facility Layout
X. Wu, September 18, 2012, HB2012, Slide 6
Future FRIB Layout
X. Wu, September 18, 2012, HB2012, Slide 7
3MeV/u Re-accelerator - ReA3 Layout
LEBTRFQ
Q/A Selection
EBITSC Linac
ReA3 Beam Distribution Line
AT-TPCANASEN
SECAR
X. Wu, September 18, 2012, HB2012, Slide 8
LEBT/RFQO
fflin
e Io
n S
ourc
e(4
He1
+ )
Bunch length monitor
RFQ
Mul
ti-ha
rmon
ic
bunc
her
CaF viewer
Faraday cup
Beam transport to the RFQ: Beam bunching Transverse
beam matching
X. Wu, September 18, 2012, HB2012, Slide 9
ReA3 SRF Cryomodules
ReA3 -• 3 ReA3 Cryomodules• 15 cavities• 2 cavity types (QWR)
– Beta=0.041 & 0.085– Prototypes for FRIB
• 8 solenoids– Same as used in FRIB
• 1st two cryomodules installedIn 2010• 3rd cryomodule under development, will be installedEarly 2013
β = 0.041 modules
β = 0.085 module
X. Wu, September 18, 2012, HB2012, Slide 10
Design Changes of β=0.085 QWR
• Old design modified to improve performance reliability
• New design of the rf joint
• Rf couplers moved to the side
• Increased distance from inner conductor to tuning plate
Both ReA3 and FRIB requirements more than fulfilled in testing naked cavities with the new rf joint design and side coupler
X. Wu, September 18, 2012, HB2012, Slide 11
ReA3 beam Distribution Line
Single cavity rebunching cryomodule
Achromatic S-Bend
High resolution 90° achromatic bend with slit
Final focusing systems
Switchyard
X. Wu, September 18, 2012, HB2012, Slide 12
ReA3 Beam Dynamics Simulations (1)Maintain beam quality – minimize emittance growth
X. Wu, September 18, 2012, HB2012, Slide 13
ReA3 Beam Dynamics Simulations (2)Meeting beam-on-target requirements
Beam size: ~ 2mmEnergy spread: ~ 1 keV/uBunch length: ~ 1 ns
X. Wu, September 18, 2012, HB2012, Slide 14
ReA3 Commissioning ongoing
Two beta=0.041 Cryomodules
RFQLEBT
Q/A Selection
EBIT
L-Line Deck Extension
RFQ2.344 MeV
6.168 MeV
α-source 5.486 MeV
X. Wu, September 18, 2012, HB2012, Slide 15
Energy Upgrade Phase I - ReA6
ReA3
ReA6EBIT
ReA3 ExperimentalHall
ReA6 ExperimentalHall(s)
X. Wu, September 18, 2012, HB2012, Slide 16
ReA6 Accelerating Cryomodules
• 4th generation beta=0.085 QWR cavities• 8 cavities• 3 SC solenoid magnets
with X/Y dipole correctors• 3 Cold beam position
monitors • ~ 6 m long• FRIB Linac Segment I will
use same cryomodules (11)
X. Wu, September 18, 2012, HB2012, Slide 17
ReA6 Beam Dynamics Simulations (1)Maintain beam quality – minimize emittance growth
X. Wu, September 18, 2012, HB2012, Slide 18
ReA6 Beam Dynamics Simulations (2)Meeting beam-on-target requirements
Beam size: ~ 2mmEnergy spread: ~ 1 keV/uBunch length: ~ 1 ns
X. Wu, September 18, 2012, HB2012, Slide 19
Energy Upgrade Phase II - ReA12
ReA3
ReA12EBIT Charge Breeder
X. Wu, September 18, 2012, HB2012, Slide 20
ReA3/ReA6/ReA12 Performance
0
5
10
15
20
25
0.1 0.2 0.3 0.4 0.5 0.6
Ek (M
eV/u
)
Q/A
ReA3
ReA6
ReA12
X. Wu, September 18, 2012, HB2012, Slide 21
Summary
• The Re-Accelerators at the NSCL will provide a new low energy high quality RIBs facility for nuclear astrophysics and nuclear science.
• Construction and commissioning underway.
• Installation of ReA3 completed FY2013
• Radioactive ion beam commissioning runs 2013
• First beamline into ReA3 hall 5/2013
• Energy upgrade phase I started– ReA6 Cryomodule fabrication has started, completion planned 2014
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