the accelerator system for rea3 – the new re-accelerated ...€¦ · microsoft powerpoint -...
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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
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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
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X. Wu, Cyclotrons 2010, 09/09/2010, Slide 3
Production of RIBs by Projectile Fragmentation at NSCL
ReA3
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X. Wu, Cyclotrons 2010, 09/09/2010, Slide 4
NSCL Present Facility Layout
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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
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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
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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
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X. Wu, Cyclotrons 2010, 09/09/2010, Slide 8
SRF
EBITQ/A
RFQ
ReA3 platform
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X. Wu, Cyclotrons 2010, 09/09/2010, Slide 9
ReA3 hardwareEBIT Charge Breeder
Q/A Separator
LEBT RFQ
SC Linac
HEBT
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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!
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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
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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
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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
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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
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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!
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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
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X. Wu, Cyclotrons 2010, 09/09/2010, Slide 17
SRF-LINAC infrastructure
Clean rooms
Lead shield
diagnostic boxes
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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.
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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
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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
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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
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X. Wu, Cyclotrons 2010, 09/09/2010, Slide 22
Strong interests using ReA3 RIBs for nuclear astrophysics experiments
AT-TPCANSENSeGACAESAR
JENSASECAR
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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)
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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)
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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 ([email protected])
DW
/W (%
)
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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
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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
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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
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X. Wu, Cyclotrons 2010, 09/09/2010, Slide 29
Re-Accelerator Energy Increase with Additional Cryomodules
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X. Wu, Cyclotrons 2010, 09/09/2010, Slide 30
NSCL Pre-FRIB (2016) Facility Layout
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X. Wu, Cyclotrons 2010, 09/09/2010, Slide 31
Fast, Stopped, and Re-accelerated RIBsat NSCL with FRIB
RIBs from FRIB
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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