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ATLAS/CARIBU Status

ATLAS/CARIBU Status. Guy Savard Scientific Director of ATLAS Argonne National Laboratory & University of Chicago Workshop on Future GRETINA Science Campaigns Argonne National Laboratory, March 1, 2013. Existing ATLAS facility. Stable beams at high intensity and energy up to 10-20 MeV/u

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ATLAS/CARIBU Status

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  1. ATLAS/CARIBU Status Guy Savard Scientific Director of ATLAS Argonne National Laboratory & University of Chicago Workshop on Future GRETINA Science Campaigns Argonne National Laboratory, March 1, 2013

  2. Existing ATLAS facility Stable beams at high intensity and energy up to 10-20 MeV/u Light in-flight radioactive beams light beams, no chemical limitations, close to stability, acceptable beam properties CARIBU beams heavy n-rich from Cf fission, no chemical limitations, low intensity, ATLAS beam quality, energies up to 15 MeV/u State-of-the-art instrumentation for Coulomb barrier and low-energy experiments Operating over 5000 hrs/yr at about 95% efficiency Users performing experiments at ATLAS: FY10: 390 FY11: 326 FY12: 394 About 10 Ph.D. theses per year (16 in FY12) 3 injectors Suite of experimental equipment ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  3. Neutron-rich beam source for ATLAS: CARIBU “front end” layout Main components of CARIBU • PRODUCTION: “ion source” is 252Cf source inside gas catcher • Thermalizes fission fragments • Extracts all species quickly • Forms low emittance beam • SELECTION: Isobar separator • Purifies beam • DELIVERY: beamlines and preparation • Switchyard • Low-energy buncher and beamlines • Charge breeder to Increase charge state for post-acceleration • Post-accelerator ATLAS and weak-beam diagnostics ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  4. RF (body) RF (cone) CARIBU gas catcher: transforms fission recoils into a beam with good optical properties • Based on smaller devices developed at ANL • Radioactive recoils stop in sub-ppb level impurity Helium gas • Radioactive ion transport by RF field + DC field + gas flow • Stainless steel and ceramics construction (1.2 m length, 50 cm inner diameter) • Fast and essentially universally applicable • Extraction in 2 RFQ sections with μRFQs for differential pumping DC gradient 252Cf He gas To acceleration and mass separator ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  5. CARIBU building with first experiment (CPT mass spectrometer) April 2011 ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  6. Extracted isotope yield at low energy (50 keV) • 1 Ci 252Cf source • about 20% of total activity extracted as ions • works for all species • complementary to uranium fission > than 500 neutron-rich species extracted at > 1/s > 150 whose masses have never been measured ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  7. CPT Measurement campaigns ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  8. In Sn Sb Te I Xe Cs Pr Nd Pm Sm Eu Gd Atomic Mass Evaluation comparison Trend: more neutron-rich nuclei are found to be less bound than expected away from stability Higher N ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  9. CPT Measurement campaigns ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  10. CPT Measurement campaigns Ongoing heavy-peak measurements 1437 - Being completed from previous PAC 1481 -measurements for r-process studies 1480 - measurements for new isotope discovery ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  11. First Coulomb excitation measurement with a CARIBU beam • First Coulexwith 141Cs – two goals: • 1. Demonstrate feasibility & study backgrounds from stable beam contamination and b decay with 850 MeV beam on Pb; i.e., “unsafe” Coulomb excitation; 4300 part/sec for 14.5 hours run. • 2. Measure B(E2) of the 11/2+state in 141Cs, via “safe Coulex” at 601 MeV for ~62 hours with ~3360 part/sec. • B(E2) = 20(5) W.u., smaller than the 2+ level in 142Ba (32(1) W.u.), but similar to the value for the 2+ state in 140Xe (25.6(8) W.u). Figure: Gamma-ray spectra from 601- & 850- MeV 141Cs with the Coulomb excitation line at 369.2 keV. S. Zhu et al., to be published ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  12. ATLAS layout with ongoing and planned upgrades Novel design from Accelerator R&D group World record performance Improved instrumentation New low-energy experimental hall High-Intensity ECR cryomodule and rebuncher rearranged EBIS CARIBU New in-flight separator (AIRIS) MHB RFQ new cryomodule ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013 12

  13. ARRA funded upgrade: New RFQ accelerator section of PII linac All PMP milestones have been met, beam tune developed, now operational. ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  14. Installation of cryomodule components (liquid helium manifold, helium and nitrogen plumbing, slow tuners, RF coupler warm windows, temperature sensors,…) and alignment of evacuated cavity-solenoid string is in progressCryomodule vacuum vessel is ready to receive cavity-solenoid string ARRA funded upgrade: Replacement of first booster cryostat module and liquid helium upgrade • Plans for FY2013 • Complete off-line assembly and cold testing • Install into the beam line (Jun.-Sept. 2013) and commission with beam   ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  15. 1st stage of ARRA funded upgrade Front end reconfiguration (RFQ, PII cavities rearrangement, electrostatic optics) completed Commissioning completed Total transmission of 80% demonstrated New tunes have been developed, ready for operation …. actually running today!!! 2nd stage of ARRA funded upgrade Construction of cryostat and cavities completed Mock up assembly completed, final assembly on-going Preparation for new cryostat installation and booster rearrangement ongoing Expecting to shut down ATLAS for installation at the end of May for ~ 4 months Restart in October, facility operational when GRETINA is ready for operation at ATLAS Summary of ongoing intensity and efficiency upgrade ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013 15

  16. Community plan for GRETINA in coming years: Complete MSU campaign by July 1 2013; Move to ATLAS and installation; ATLAS/CARIBU campaign from October 2013 to December 2014. Return to MSU Preparation for GRETINA @ATLAS campaign: Site preparation ongoing for stand-alone operation and operation in front of the FMA; GRETINA WORKSHOP (March 1-2 at Argonne); Day 1: discuss and exchange information with GRETINA users on the detailed science opportunities at ATLAS. Provide guidance for the coming call for proposals, Day 2: discuss science opportunities and future siting of GRETINA beyond the ATLAS campaign. Call for proposals including ATLAS/CARIBU beams to GRETINA (early March 2013) ATLAS/GRETINA PAC (May 2013) GRETINA installation at ATLAS (July-October 2013) Completion of ATLAS ARRA funded upgrade and installation of new source at CARIBU (September-October 2013) Start of GRETINA campaign at ATLAS (October 2013) Preparation for GRETINA campaign at ATLAS ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  17. ( 6140 + 1542 hrs) ATLAS next few years running plan • FY2012 ( 5100 + 800 hrs): • CARIBU started (1542 hrs)  move to stronger Cf source • ATLAS running (6140 hrs) + modifications to prepare RFQ installation • FY2013 ( 3100 + 1500 hrs): • Fall PAC: accepted experiments for ATLAS and low-energy and reaccelerated CARIBU beams • Fall  RFQ installation  ATLAS running tandem beams, CARIBU running low-energy with “1Ci source” • Winter/Spring: ATLAS + low-energy and reaccelerated CARIBU beams available • Spring PAC: accepting GRETINA experiments + all other ATLAS/CARIBU experiments • Summer booster reconfiguration  low-energy CARIBU beams, no ATLAS beams, GRETINA arrives • FY2014 ( 5500 + 1500 hrs): • GRETINA + CARIBU/ATLAS beams, low-energy CARIBU beams • Deep-inelastic production along N=126 for CPT/X-array, move tandem out, new CARIBU source • FY2015 (5500 + 1500 hrs): • Fall  EBIS installation Low-energy CARIBU beams, ATLAS beams, GRETINA leaves • Winter/Spring/Summer  AGFA installation, large CARIBU experimental area available, all beams available ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  18. Status • ATLAS is preparing for the GRETINA campaign • ARRA funded upgrade being completed by Oct 2013 • Ongoing preparation for GRETINA • In “stand alone” mode on APEX beamline • In front of FMA • New stronger 252Cf source requested for the fall • Running a number of CARIBU reaccelerated beam experiments this spring • Need input from the community • What experiments do you want to be able to do with GRETINA at ATLAS? • Are the two locations the right ones? Are they enough? Are they both needed? • What auxiliary detectors need to be accommodated? • Should we setup campaigns? • What information do we need to provide to users? • What experiments are best done with GRETINA, what experiments are best done with Digital Gammasphere? • How do we handle the data? ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  19. ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

  20. Gammasphere  Digital Gammasphere Gammasphere World-leading g-spectrometer 100 HPGe Compton suppressed In front of FMA or in stand-alone mode Ancillary detectors CHICO: Coulomb Excitation HERCULES: Evaporation residues MicroBall: charged particles Neutron wall Rotating target wheel: High intensity Plungers: Lifetime studies X-ray counters ~ 40% of beamtime at ATLAS Digital GS @ 40K/s and 1 ms shaping is as good as “Old” GS @10K/s and 10 ms shaping Digital upgrade • Goal: Increase rates x 4-12 • Digitize energy signals • Done … no loss in resolution, X4 gain in countrate capability • Use Gretina digitizers • Digitize BGO shields • Status: Ongoing • Completion: 2013 ATLAS\CARIBU Status Guy Savard, Argonne National Laboratory February 15, 2013

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