X. Wu, Cyclotrons 2010, 09/09/2010, Slide 1

The Accelerator System for ReA3 – the New Re-accelerated RIBs Facility at MSU

XiaoyuXiaoyu WuWuNational Superconducting Cyclotron LaboratoryNational Superconducting Cyclotron Laboratory

Michigan State UniversityMichigan State Universityon behalf of the NSCL ReA3 teamon behalf of the NSCL ReA3 team

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 2

Acknowledgements

• Accelerator R&D – O. Kester– F. Marti– M. Doleans– C. Compton– W. Hartung– L. Popielarski– J. Popielarski– J. Wlodarczak– Q. Zhao– C. Benatti– G. Perdikakis

• Mechanical Engineering– D. Lawton– J. Ottarson– M. Johnson– J. Wenstrom

• Nuclear Physics– D. Bazin– G. Bollen– S. Schwarz– J. Yurkon– F. Montes

• Facility/Operation– D. Sanderson– A. Zeller– S. Chouhan– J. Bierwagen– S. Bricker– N. Verhanovitz– M. Portillo– J. Delauter– P. Miller– G. Machicoane– D. Cole

• Electronics– J. Vincent– K. Davidson– N. Usher– K. Holland

• Special thanks to B. Laxdal and colleagues from TRIUMF

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 3

Production of RIBs by Projectile Fragmentation at NSCL

ReA3

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 4

NSCL Present Facility Layout

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 5

Facility for Rare Isotope Beams (FRIB)

•>200 MeV/u for all ions •400kW •Superconducting driver linac•Three-stage fragmentation separator•Successfully passed DOE CD-1 review•To be completed in ~2018

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 6

ReA3 Connections to CCF and FRIB

• ReA3 will be operated as a radioactive beam reaccelerator for the Coupled Cyclotron Facility in the coming years

• ReA3 will be operated as a radioactive beam reaccelerator for FRIB once the FRIB driver linac is operational and replaces the coupled cyclotrons

• ReA3 shares similar technology as the FRIB driver linac– Low energy beam lines for ion beams– RFQ– SRF linac

• ReA3 will provide valuable experience to FRIB for tuning strategies, particularly for SRF linac phasing strategy and development of beam tuning applications

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 7

Modern ion linac:• LEBT with multi-harmonic buncher• Radio frequency quadrupole (RFQ) • Superconducting RF linac• HEBT with rebuncher

Higher energies for lighter ionsMinimum energy spread 1keVMinimum pulse length 1 ns

12 keV/u

238U 0.3 – 3 MeV/u48Ca 0.3 – 6 MeV/u

600 keV/u

ReA3 platform

EBIT charge breeder

RFQ

SRF-linac

HEBT

LEBTQ/A-Separator

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 8

SRF

EBITQ/A

RFQ

ReA3 platform

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 9

ReA3 hardwareEBIT Charge Breeder

Q/A Separator

LEBT RFQ

SC Linac

HEBT

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 10

ReA3 ReA3 –– EBIT charge breederEBIT charge breeder

• Unique features:– Continuous injection of ions

» high capture rate– Variable extraction duty cycle

» μs pulse to quasi-continuous– Short breeding time (<10 ms)– High efficiency

> 50% in a single charge state

EBIT installation will be completed in October,Simulations are performed to optimize performance,Injection tests end of 2010!

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 11

Achromatic Q/A-separatorB

eam

fro

mEB

IT

Energy collimationslit

Mass separationslit

Resolvingpower > 100

Resolvingpower > 100

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 12

Low energy beam transport (LEBT)

Stable Ion Source(4He1+)

Multi-harmonic buncher

Triple-Bender

E-Quads

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 13

Beam Diagnostics (LEBT)Bunch length

monitor

RFQ

Faraday cupCaF viewer

45 deg. slit

MCP viewer

Attenuators

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 14

Emittance Scans

• RFQ transverse acceptance >– εn = 1.0 π-mm-mrad– εg = 200 π-mm-mrad (@ RFQ input energy of 12 keV/u )

• Desired twiss parameters α = 0.6 and β = 0.06 m– Measured beam emittances fit into RFQ transverse acceptance

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 15

RT 4RT 4--rod RFQrod RFQ

tuningplate

stemrods(milled fromCu profiles)

New design:Al-tank (no copper plating required)Simple adjustment of tuning plates,no alignment requiredHigh power operation

New design:Al-tank (no copper plating required)Simple adjustment of tuning plates,no alignment requiredHigh power operation

RFQ installed in beam line,Conditioning started,Beam tests in September 2010!

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 16

ReA3 SRF-cryomodules

ReA3 -• 3 ReA3 Cryomodules• 15 cavities• 2 cavity types (QWR)

– Beta=0.041 & 0.085– Same as FRIB design

• 8 solenoids– Same as used in FRIB

First two cryomodulescompleted,third in progressto be completed Q2FY2011

re-buncher β = 0.041 module β = 0.085 module

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 17

SRF-LINAC infrastructure

Clean rooms

Lead shield

diagnostic boxes

C.K. Gelbke, 9/15/2010, Slide 18

Building cryomodules!

Vacuum Vessel ReA3 design

Thermal Shield

CryogenicDistribution System

Cold-massReA3 Cryomodule

Clean room assemblyClean room assembly

of cold mass required!of cold mass required!

Performance tests of cavitiesPerformance tests of cavities

and solenoids.and solenoids.

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 19

ReA3 – QWRs testing β o

pt=

0.0

41

β opt

=0

.08

5

0 10 20 30 40 50 60Ep (MV/m)

108

109

1010

Q0

SC236 (BB)SC240 (Ja)SC241 (Ch)SC237 (Fr)SC243 (Dr)SC245 (Nm)SC244 (PH)

ReA3 FRIB

3180110-002

0 8 16 24 32 40 48Ep (MV/m)

108

109

1010

Q0

Generation1st (RIA)2nd (SC247 Jk)

ReA3 FRIB

3180710-022

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 20

ReA3 High Energy Beam Transport (HEBT)

Beam dynamics design completedMechanical design ofS-bend completedMagnets in productionCompleted end of 2010

Beam dynamics design completedMechanical design ofS-bend completedMagnets in productionCompleted end of 2010

ReA3 Platform

Beam dynamics design completed

Design of Re-bunchercryomodule started

Completed end of 2011

Beam dynamics design completed

Design of Re-bunchercryomodule started

Completed end of 2011

β=0.041 QWRRe-buncher

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 21

ReA3 Facility Layout

ReA3 Platform

SC Linac

EBIT

Q/A SeparatorLEBT+RFQ

HEBT

ReA3 Experimental Hall

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 22

Strong interests using ReA3 RIBs for nuclear astrophysics experiments

AT-TPCANSENSeGACAESAR

JENSASECAR

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 23

ReA3 Beam Simulations

0 5 10 15 20 25 30 35 40 45 500

1

2

3

4Energy

Z (m)

Ek

(MeV

/u)

0 5 10 15 20 25 30 35 40 45 500

10

20

30

40Beam Envelope

Z (m)

Rm

ax (m

m)

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 24

ReA3 Beam Simulations

0 5 10 15 20 25 30 35 40 45 500

0.1

0.2

0.3

0.4Longitudinal rms emittance

Z (m)

Erm

s(z)

(pi k

eV/u

-ns)

0 5 10 15 20 25 30 35 40 45 500

1

2

3

4Longitudinal 99.5% emittance

Z (m)

E99

5(z)

(pi k

eV/u

-ns)

0 5 10 15 20 25 30 35 40 45 500

0.1

0.2

0.3

0.4Transverse rms emittances

Z (m)

Erm

s(x/

y) (p

i mm

-mra

d)

Erms(x)Erms(y)

0 5 10 15 20 25 30 35 40 45 500

0.5

1

1.5

2Transverse 99.5% emittances

Z (m)

E99

5(x/

y) (p

i mm

-mra

d)

E995(x)E995(y)

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 25

ReA3 Beam Simulations

-10 -5 0 5 100

200

400

600

800

1000Horizontal plane

X (mm)

N

-10 -5 0 5 100

200

400

600

800

1000Vertical plane

Y (mm)

N

-1 -0.5 0 0.5 10

500

1000

1500

2000Bunch length

Time (ns)

N

-2 -1 0 1 20

500

1000

1500

2000Energy spread

dEk (keV/u)

N

-10 -5 0 5 10-10

-5

0

5

10Horizontal Phase Space

X (mm)

Px

(mra

d)

-10 -5 0 5 10-10

-5

0

5

10Vertical Phase Space

Y (mm)

Py

(mra

d)

-10 -5 0 5 10-10

-5

0

5

10Real Space

X (mm)

Y (m

rad)

-40 -20 0 20 40-0.4

-0.2

0

0.2

0.4Longitudinal Phase Space

Phase (degree@80.5MHz)

DW

/W (%

)

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 26

ReA3 to ReA6 Upgrade

β=0.041QWRRe-buncher

β=0.085 QWRRe-buncher

β=0.085 QWRAcceleratingCryomodule

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 27

ReA6 Facility Layout

HEBT

ReA3 Platform

EBITSC Linac

LEBT+RFQQ/A Separator

ReA3 Experimental Hall

HEBT

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 28

ReA3 SRF LINACon platform

ReA6 to ReA12 Upgrade

β=0.085 QWRRe-buncher

β=0.085 QWR AcceleratingCryomodule

ReA6 ReA12

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 29

Re-Accelerator Energy Increase with Additional Cryomodules

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 30

NSCL Pre-FRIB (2016) Facility Layout

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 31

Fast, Stopped, and Re-accelerated RIBsat NSCL with FRIB

RIBs from FRIB

X. Wu, Cyclotrons 2010, 09/09/2010, Slide 32

Summary ReA3 status

Test of EBIT electron beam system done, magnet commissioned,assembly ongoing first operation October

Q/A-separator beam commissioning completed

LEBT beam commissioning is presently performed

RFQ tuning completed, conditioning ongoing, firstbeam tests in early September 2010

SRF-linac:− re-buncher rf-tests completed, first beam tests in conjunction with

RFQ beam commissioning− β = 0.041 module installed, hardware tests are being performed− β = 0.085 under constructionAccelerated stable beams end of 2010

Reaccelerated beams in 2011