NP LOW ENERGY FACILITIES AND THE SBIR/STTR PROGRAM … · INSTRUMENTATION FOR LOW ENERGY NUCLEAR...
Transcript of NP LOW ENERGY FACILITIES AND THE SBIR/STTR PROGRAM … · INSTRUMENTATION FOR LOW ENERGY NUCLEAR...
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NP LOW ENERGY FACILITIES AND THE SBIR/STTR PROGRAM
CLAYTON DICKERSON
Technical ManagerArgonne Tandem Linear Accelerator SystemArgonne National Laboratory
DOE NP SBIR/STTR Exchange Meeting13-14 August 2019
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OUTLINE Low energy nuclear physics
DOE facilities
– Overview
– ATLAS/CARIBU
– FRIB
Instrumentation
Summary
Acknowledgements – information provided by
– Georg Bollen, Thomas Glasmacher, Dave Morrissey, Greg Severin, Brad Sherrill
(FRIB/MSU)
– Heather Crawford, Paul Fallon, Jackie Gates, Augusto Macchiavelli (LBNL)
– Guy Savard (ANL)2
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LOW ENERGY NUCLEAR PHYSICS
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LOW ENERGY NUCLEAR PHYSICS
Refers to the energy scale of the science
– Of order few MeV (nuclear binding scale)
Physics encompasses nuclear structure,
decay, reactions and limits of nuclear chart
Most direct impacts to our lives
– Energy
– Medicine
– Security . . .
4
‘Lo
w E
nerg
y’
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THE NUCLEAR LANDSCAPEWhat are the limits of the nuclear
chart?
• Nucleon (proton/neutron) driplines
• Super-heavy nuclei
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THE NUCLEAR LANDSCAPEWhat are the limits of the nuclear
chart?
• Nucleon (proton/neutron) driplines
• Super-heavy nuclei
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THE NUCLEAR LANDSCAPEWhat are the limits of the nuclear
chart?
• Nucleon (proton/neutron) driplines
• Super-heavy nuclei
How does structure change across
the chart?
• Extreme N/Z ratios?
• Collective excitation modes?
• Emergent phenomena?
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ANSWERING THESE QUESTIONS1. Accelerator facilities
– Diverse capabilities to deliver beams of stable and
radioactive ions, at energies ranging from ~ 100 keV to
GeV
2. Advanced Detectors and Instrumentation– High efficiency, high resolution detection systems for:
• Light charged particles
• Heavy charged fragments
• Gamma-rays
• Neutrons
– Data acquisition, software and data
storage
https://www.energy.gov/science/np/nuclear-physics
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ACCELERATOR FACILITIES
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RARE ISOTOPE BEAM FACILITIES WORLDWIDE
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From Sherrill/Bollen - MSU
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LOW ENERGY NUCLEAR PHYSICS FACILITIESDOE National User Facilities
Argonne Tandem-Linear Accelerator System (ATLAS) – https://www.anl.gov/atlas– High-intensity stable beams– Radioactive beam program with stopped and re-
accelerated fission products and in-flight beams
Facility for Rare Isotope Beams (FRIB) –http://frib.msu.edu– World-leading facility under construction at MSU– 400 kW heavy-ion SRF line; > 200 MeV/u – Rare isotopes via fragmentation and in-flight fission– Fast, stopped, and reaccelerated beams
NSF User Facilities
National Superconducting Cyclotron Laboratory (NSCL) – http://nscl.msu.edu – In-flight rare isotope beam production– Fast, stopped, and reaccelerated beams
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LOW ENERGY NUCLEAR PHYSICS FACILITIESOther DOE facilities (local use)
LBNL 88-Inch Cyclotron – http://cyclotron.lbl.gov
– Basic and applied research with stable beams
Texas A&M Cyclotron Institute –
http://cyclotron.tamu.edu
– Nuclear physics research with stable and
radioactive re‐accelerated beams
Triangle‐Universities Nuclear Laboratory
(TUNL) – http://www.tunl.duke.edu
– High Intensity Gamma Source (HIGS)
– Laboratory for Experimental Nuclear
Astrophysics
– Tandem Van de Graaff accelerator
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ARGONNE TANDEM LINEAR ACCELERATOR
SYSTEM – ATLAS
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ATLAS/CARIBU FACILITY Stable beams at high intensity, ~10pmA, and energy from ~0.5 to 10-20 MeV/u
CARIBU (CAlifornium Rare Isotope Breeder Upgrade) beams– heavy n-rich from Cf fission, no chemical limitations, low intensity, ATLAS beam
quality, energies up to 10 MeV/u
In-flight radioactive beams with RAISOR– light beams (A<50), no
chemical limitations, close to stability, acceptable beam properties
State-of-the-art instrumentation for Coulomb barrier and low-energy experiments
Operating 5500-6500 hrs/yr(+ 2000 hrs/yr CARIBU low energy)
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ATLAS FACILITY LAYOUT
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ATLAS EXPERIMENTAL EQUIPMENT
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+ outside instruments: GRETINA, CHICO-II, HERCULES, GODDESS, VANDLE, MTAS, SUN …
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CARIBU BEAMS FOR ATLAS
“Thin” 252Cf source
About 20% of fission branch extracted
as ions
Works for all species –
no chemical limitations
Unique beams available
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REACCELERATED CARIBU BEAMS
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• 252Cf fission fragments
• ≤ 106 ions/s
• 80 ≤ A ≤ 160
• q = +1 or +2
• High purity He gas catcher
• Thermalizes fission fragments
• RF electrodes form beam
• Online magnetic separation
• 1:15000 resolution
• Fast breeding
• High efficiency
• Low contamination
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ATLAS IN-FLIGHT RADIOACTIVE BEAMS
Magnetic chicane couple with an RF sweeper
1-2 nucleon transfer reactions
In-flight RIBs used to study
– Single particle structure
– Pairing in nuclei
– Nuclear astrophysics
Argonne In-flight Radioactive Ion Separator (RAISOR)
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Primary
Target SeparatorDebuncher
SecondaryPrimary
Target SeparatorDebuncher
Secondary
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RAISOR enables higher production intensities which
will expand access to the chart of the nuclides
Improvements
– Selectivity
– Purity
– Target accessibility
ATLAS IN-FLIGHT RADIOACTIVE BEAMS
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In-flight beams previously
produced at ATLAS
Estimated secondary beams with
>103 pps with RAISOR
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N=126 FACTORY
Access to nuclides in the last r-process abundance
peak, the N=126 peak
High intensity heavy ions at 8-10 MeV/u
Multi-nucleon transfer (MNT)
reactions
136Xe + 198Pt at 10 MeV/u for
N=126
Similar ion manipulation as
CARIBU low energy
– Gas catcher – RFQ ion guide
– separation – MRTOF – trap
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ATLAS MULTI-USER UPGRADE
Spectroscopy of the heaviest isotopes– Recoil and gamma efficiencies are now optimized,
beam intensity limited by rate in Ge detectors . . .
The main knob left is running longer
Production of new neutron-rich
isotopes of the heaviest elements– Small cross-section and long running time
Detailed single-particle spectroscopy in
the medium mass region– Low production rates and intensities
Responding to user needs
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ATLAS MULTI-USER UPGRADE EBIS beams represents 1-3%
duty factor
Combine pulsed EBIS beam with
stable ECR beam
– Address high demand on facility
– Enable long duration experiments
– Maximize efficient accelerator usage
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FACILITY FOR RARE ISOTOPE BEAMS –
FRIB
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FRIB – FACILITY FOR RARE ISOTOPE BEAMS
Rare isotope production via in-flight technique with primary beams up to 400 kW, 200 MeV/u uranium
Fast, stopped and re-accelerated beam capability
Upgrade options– 400 MeV/u for uranium– ISOL production –
multi-user capability
World-leading Next-generation Rare Isotope Beam Facility
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FRIB project start 6/2009
Civil construction started 3/2014
Technical construction started 10/2014
Managed to early completion FY 2021
CD-4 (project completion) 6/2022
Total project cost $730 million
NSCL enables pre-FRIB science
NSCL
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FRIB BEAMS WILL ENABLE NEW DISCOVERIES
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about 3000 known isotopes
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FRIB – FOUR SCIENCE THEMESProperties of nuclei
– Develop a predictive model of nuclei and their interactions– Many-body quantum problem: intellectual overlap to mesoscopic
science, quantum dots, atomic clusters, etc.
Astrophysical processes– Origin of the elements in the cosmos– Explosive environments: novae,
supernovae, X-ray bursts …– Properties of neutron stars
Tests of fundamental symmetries– Effects of symmetry violations are
amplified in certain nuclei
Societal applications and benefits– Bio-medicine, energy, material
sciences, national security
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FRIB – INSTALLATION ADVANCED, FIRST BEAMS ACCELERATED
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On track for early completion by end of 2021
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FRIB ACCELERATOR SYSTEMS SUPERCONDUCTING RF DRIVER LINAC Accelerate ion species up to 238U with
energies of no less than 200 MeV/u
Provide beam power up to 400 kW
Energy upgrade to 400 MeV/u for uranium by filling vacant slots with 12 SRF cryomodules
MSU has funded β=0.65 cavity prototype development
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LINEAR ACCELERATOR IN FRIB TUNNEL
First section of superconducting linac commissioned
– 40Ar9+ beam accelerated to >20 MeV/u
>80% of cryomodules installed
Helium refrigeration system commissioned at 2K
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Three stage magnetic fragment separator
– High acceptance, high resolution to maximize science
– Provisions for isotope harvesting incorporated
in the design
Challenges
– High power densities
– High radiation
FRIB PRODUCTION FACILITIESFRAGMENT SEPARATOR
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Multi-slice rotating graphite
target
Water-filled
rotating beam dump
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FRIB PRODUCTION FACILITIESFRAGMENT SEPARATOR High-power target module for rare
isotope production assembly complete– Multi-slice rotating graphite disks
High-power beam dump module fabricated– Water filled rotating drum to
absorb up to 300 kW primary beam
Radiation resistant super-conducting quadrupole magnets– Installation of magnets in
fragment separator front-end underway
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Beam dump
assembly
Target module on
cradle
Radiation resistant
magnets in separator
vacuum vessels
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LEVERAGING FRIB CAPABILITIES
Many rare isotopes are produced but only one isotope delivered to single user
– Often 1000 other isotopes are produced that could be harvested and used for experiments or applications
FRIB has provisions for isotopeharvesting incorporated in the design
– NCU water-cooling and off-gas system prepared for harvesting upgrade
2015 Long Range Plan for the NP-DOE Isotope Program recognizes FRIB importance and recommends investment in infrastructure for isotope harvesting at FRIB
Whitepaper on Isotope Harvesting:– Isotope Harvesting at FRIB: Additional opportunities
for scientific discovery, E. Paige Abel et al 2019 J. Phys. G: Nucl. Part. Phys. in press https://doi.org/10.1088/1361-6471/ab26cc
Isotope Harvesting for Broad Benefit
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INSTRUMENTATION
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ADVANCED INSTRUMENTATION FOR LOW ENERGY NUCLEAR PHYSICS State-of-the art instrumentation is required to maximize science opportunities
with rare isotope beams
– Detectors
• High efficiency, high resolution
– Spectrometers
• Large acceptance, high rigidity
– Ion and atom traps, laser facilities
• High-precision experiments
– Control systems and data acquisitions
Unique challenges in cutting-edge facilities
– High beam rates / very low beam rates
– Radiation hard equipment
– Complex measurements with multiple systems
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INSTRUMENTATION FOR LOW ENERGY NUCLEAR PHYSICS: GRETINA AND GRETA GRETINA – highly segmented Ge detectors to
track and reconstruct gamma-rays is the first phase of the larger . . .
GRETA (Gamma Ray Energy Tracking Array) will be the most advanced gamma-ray detector array for nuclear science – Will cover ~ 80% of the full solid angle, and
be key in the physics programs at ATLAS and FRIB with fast and reaccelerated beams
– GRETA will benefit from High Rigidity Spectrometer (HRS) at FRIB• Design study funded by DOE-NP
underway• HRS building addition underway at MSU
36http://greta.lbl.gov
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LOW ENERGY NP USER FACILITIES AND THE SBIR/STTR PROGRAM SBIR/STTR program is important for the DOE Low Energy NP facilities
– Development of new techniques, instrumentation and supporting systems are suitable SBIR/STTR projects
– New, higher power facilities are being built worldwide and existing facilities are being upgraded
Examples of possible areas for SBIR/STTR activities are– High-rate, position sensitive particle tracking detectors and timing detectors for
high-energy heavy-ions – Fast data acquisition electronics– Target technology (high-power targets, thin targets, windows, strippers, …)– Ion source technology– Beam catcher/release systems– Radiation hard precision magnetic field probes– Radiation hard actuator systems– Real time data visualization framework– Other accelerator related developments
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SUMMARY
The US low energy nuclear physics community is strong with exciting
opportunities on the horizon
DOE NP facilities are pushing the limits of technology to enable this science
– Existing low-energy rare isotope beam facilities in the US provide forefront
research opportunities today
– FRIB will be a world-leading rare isotope facility that will enable new
discoveries
DOE NP SBIR/STTR program plays an important role in making the low energy
nuclear physics program successful and will be critical moving in the FRIB era
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THANK YOU