daniela leitner michigan state university
TRANSCRIPT
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• NSCL is funded by NSF in support of a versatile user program with a historical average of 4500 hours of operation per year
• Average experiment requires 120 hours of primary beam and multiple rare isotope tunes
• FY2013: First GRETINA campaign: 5600hr of operation 24 successful experiments (MSU support of $4 M)
• FY2014: 3500 hours scheduled (funding limited)
CCF Operations In Perspective
CFF operations for users is funding limited
Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014
More than 1000 RIBs have been produced and more than 900 RIBs have been used in experiments
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CCF Is The Only Facility In The World That Provides Fast, Stopped, And Reaccelerated Beams Of Rare Isotopes
Science-driven upgrades respond to articulated user needs
Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014
Fast Beams Gas Stopper Stopped beams Reaccelerated Beams
Space for future expansion of the science program
ReAccelerator Facility
A1900 Fragment Separator
K1200 Cyclotron
K500 Cyclotron
MoNA LISA
Sweeper Magnet
SECAR (design) JENSA ANASEN, FSU, SuN,
SEETF SeGA HiRA , CAESAR, LENDA, LH2 target
BCS NERO DDAS, CAESAR
RFFS
Momentum Compression ANL Gas Stopper
BECOLA LEBIT
S800
ReA6-12 Hall ReA3 Hall
AT-TPC
Proton detector
20 meter
Triplex Plunger GRETINA (DOE)
Cyclotron Stopper Cryogenic Gas Stopper
Laser Ablation Minitrap SIPT Positron Polarimeter
CFFD, JANUS….
Cooler Buncher Helium Jet
2014- 2016
2011-2013
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– PAC-38 (Apr. 2014): 30 (of 48) proposals were approved for 4246 hours (6 experiments use reaccelerated beams, 4 use stopped beam facility, 20 use fast beams)
– New backlog is 6964 hrs
NSCL PAC Statistics
CFF operates well below capacity of 6,000 hours/year (funding limiting)
Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014
• PAC 39 early FY2015 • Pressure for beam time
will increase in FY2015 when GRETINA will return to NSCL
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Equipment developed and commissioned by users can be used for research with beams from CCF now and later from FRIB
NSF plays a critical stewardship role for maintaining and evolving cutting edge research capabilities and user program while FRIB is built
Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014
Production Linac
Target
Fragment Separator (tie into the existing facility
Fast Beams
Stopped and ReAccelerated Beams
In-situ commissioning and first science with beams from CCF FRIB early completion: 12/2020 CD4 6/2022
EBIT CB
RFQ CM2
CM3
CM1
ReA6
SECAR
AT-TPC, …
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NSCL Reaccelerator (ReA) Facility New Opportunity for NSCL Users
ReA3 user program will start late 2014
Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014
CCF A1900
> 50 MeV/u Experiments
Cryomodule 5,6 β=8.5%
Cryomodule 4 β=8.5%
Cryomodule 3 β=8.5%
Cryomodule 2 β=4.1%
CM 1 4.1%
RFQ MHB
Mass separaFon
Gas Stopper
1+ ‒› n+ Future expansion ReA12
ANASEN, SUN, LENDA, SeGA/
CAESAR JENSA Ongoing Developments
Cooler Buncher (2015) ECR injector (2015/16) Prebuncher (2015/16) Rebuncher (2016) Cryogenic Gas Cell (2016/2017) Cycstopper (2016/17)
ANASEN Detector
JENSA Gas Jet Target (SECAR)
ReA3 Hall Commissioned in 2013/2014 ANASEN: 7/2013
AT-TPC: 12/2013 JENSA:
3/3/2014
At-TPC Line
7 Joint DNP Town Meetings on Nuclear Structure and
Nuclear Astrophysics , August 21-23, 2014
Operational Highlight – Reaccelerated Beams First Low Energy Rare Isotope Experiment In The Rea3 Hall (8/2013)
8 Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014
37Cl
13C
Reaccelerated 37K
Energy [A.U.] E
nerg
y L
oss [
A.U
.]
37K produced by CCF and separated by A1900
Linear Gas Cell
Analyzing Magnet
Purity for K-37 ~ 100%
To R
eA
Purity for K-37 ~ 50%
37K+
37K17+
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Installation of Remaining ReA3 Cryomodule
Integrated testing is ongoing, design goals have been demonstrated
Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 "
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High Energy LINAC Section ReA6-ReA12 Expansion can be done without interrupting the ReA3 Research Program
Science Case for ReA6-12 is compelling
EBIT CB
RFQ
CM2
CM3
CM1
ReA3
SECAR
AT-TPC
ReA12 Equipment & Beamlines
TBD (user driven)
D-Line N4 Stopped beams A1900
L-Line
ReA3 Low Energy Hall Commissioned 2013/2014
ReA12 High Energy Hall (conceptual design)
JANUS, ANASEN, SuN, CFFD….
AT-TPC
ISLA
GRETINA
Room for Expansion (Higher Energies)
• Nuclear Structure: E > 6 MeV/u enables the use of the full arsenal of tools for low energy nuclear science, Coulomb Excitation, inelastic reaction, fission, fission barriers, and fusion evaporation reactions ..
• Surrogate Reactions: Neutron captures • Astrophysical reactions using ANC technique
Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 "
• With adequate Federal funding ReA6 -ReA12 can be built without impacting the ReA3 program − Novel Bottom-Up design (more cost effective, better alignment) − Cavity performance has been demonstrated − ReA3 can be upgraded one module at a time without impacting the science program
Proof of Principle for new ReA6 cryomodule has been progressing with MSU Funding
11"Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 "
3.85 W 2K
4K
ReA6 Goal
FRIB (2K)
(2014-proof of principle, 2 Cavities, 1 solenoid)
ReA12 Energy Reach
12"Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 "
• NSCL is the nation’s flagship user facility for rare isotope research with new cutting edge capabilities
• Demand for rare isotope beams (fast, stopped, and reaccelerated) is high
• NSCL currently operates well below capacity
• ReA3 provides a world-unique science capability for low energy rare isotope beams, ready for operations
• ReA12 energy upgrade has been a high priority for users with a compelling science case, but requires additional funds
• New instrumentation and tools can use CCF beams for research now and will benefit FRIB science program later
Summary
13"Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 "
Back-up
Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 " 14
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ReΑ Concept: 3 Stages
Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014
Requirements Ion efficiency for all elements > 20 % EBIT charge breeder + high efficiency
LINAC Beam rate capabilities 108 ions/sec Hybrid EBIS/T charge breeder
High beam purity A1900, EBIT CB, Q/A Low energy spread, short pulse length
1keV/u, 1nsec Multiharmonic external buncher and tight phase control in SRF linac
Q/A
CCF A1900
> 50 MeV/u Experiments
Cryomodule 5,6 β=8.5%
Cryomodule 4 β=8.5%
Cryomodule 3 β=8.5%
Cryomodule 2 β=4.1%
CM 1 4.1% RFQ
MHB
1+→n+
Mass separaFon
Gas Stopper
ReA12 optics design is starting/shielding calculations are being finalized for the accelerator
16"Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 "
Energy spread requirements Bunch lengths requirements Bunch spacing
-4 -2 0 2 4-4
-2
0
2
4Real Space
X (mm)
Y (m
rad)
-4 -2 0 2 40
100
200
300
400Horizontal plane
X (mm)
N
0 100 200 300 400-4
-2
0
2
4Vertical plane
Y (m
m)
N
12MeV/u Transverse Phase space
• Nominal pulse structure for 80.5 MHz is 12.54 nsec • Currently exploring the option of pre-buncher between EBIT & RFQ
– Prebunching the beam using 16.1MHz buncher (62.5 nsec spacing)
Time structure from ReA
17"Joint DNP Town Meetings on Nuclear Structure and Nuclear Astrophysics , August 21-23, 2014 "
0
100
200
300
400
500
600
700
880 890 900 910 920 930 940 950
Cou
nts
(arb
.uni
t)
nsec
FWHM0.52 nsec
12.54 nsec
-0.1 -0.05 0 0.05 0.1-20
-10
0
10
20Longitudinal: Energy& Time
T (ns)
DEk(
keV/
u)
-0.1 -0.05 0 0.05 0.10
500
1000
1500
2000Bunch Length
T (ns)
N
0 500 1000 1500 2000-20
-10
0
10
20Energy Spread
DEk(
keV/
u)
N
Longitudinal Phase Plot ReA12