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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