page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, R. Catherall, F. Plewinski, T. Stora, E. Wildner. 38 th Meeting of the INTC CERN, 4 th November 2010
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Outline Motivation ESS Targetry Beta-beams Tests at ISOLDE Production in sodium Experimental setup Beam request Summary
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Motivation for Using Sodium 3 European Spallation Source Na-cooled W target Beta-Beams Production of 18 Ne
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 European Spallation Source 4 A 5 MW long pulse spallation 1.3 – 2 ms, Hz A 5 MW long pulse spallation 1.3 – 2 ms, Hz Cold or thermal coupled moderators Cold or thermal coupled moderators 22 (– 30) instruments 22 (– 30) instruments 1.5 B€ to build, ~100 M€/y to operate 1.5 B€ to build, ~100 M€/y to operate employees employees users users
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 ESS Partner Countries 5 Sweden, Denmark and Norway 50% of construction costs 16 Partners today “We have got the money!”
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 ESS in Lund 6
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 ESS2003 Target Station Building 7
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 ESS2003 Hg Target System 8
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 ESS2003 Hg Target Trolley 9
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 ESS2010 TSCS Concept Spectrum 10 Spallation EnvironmentOther Environments Routine Operation Full scale Prototype Prototype testing Commercial use Industrial R&D Target material Hg+ PbBi−+ PbAu−+ Pb+ W+ CoolantWater+ Liquid Na−++ He gas−++ Target type Stationary # + Rotating−+ # Stationary structural components
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Target Lifetime 11 FacilityTargetDamag e Int. Beam Max. Power Current density Charge density Time Online [dpa][MW.hr][MW] [ A.cm -2 ] [C.cm -2 ][weeks] SINQCannelloni Online? MEGAPIE predicted MEGAPIE online SNSHg Predicted ?22552 Hg Target 1 online ? Hg Target 2 online ?14552 Rotating predicted JSNSPredicted (no cavitation) Predicted (cavitation) ESS2003Predicted [bauer, vlad] ESS2010Predicted Hg [Ene] Compilation of lifetimes: material independent
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Stationary Target Lifetime 12 Efficient target changeover required
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Stationary: Na-Cooled Solid Tungsten > Neutron production slightly better than W water cooled No moderation High average density > Excellent thermal properties > Low pressure > Analog to water : tests and mock up with water > W-Na compatibility (non-irr.) => No Ta cladding > Draining the loop could remove most of the loop activity. > Maintenance is flexible and known. 13 F. Plewinski, ESS
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Stationary: Na-Cooled Solid Tungsten 14 F. Plewinski, ESS
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Environment Comparison 15 Representation of the typical ranges of ratio of displacement rate to helium production rate (He appm/dpa) as a function of the displacement rate per full power year (dpa/FPY) for various neutron irradiation situations. Typical example data are for: current 14 MeV source (RTNS-II); mixed spectrum reactors (HFIR (USA), HFR (NL), SM2 (RF); existing spallation sources (PIREX, SINQ, LAMPF and ISIS in the neutron-only irradiation regimes). G.A. Cottrell, L.J. Baker, JNM 318 (2003)
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Environment Comparison dpaH & HeTemperatureCorrosionPulsed Operation Codes & Standards Spallation Source ++-++− ADS++++−− Fusion+−+−++ F.R. (Na)+−−+~−+ 16
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 CERN based -beam layout 17
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Conceptual target loop for 18 Ne production 18
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 TALYS Production Code Benchmarking 19
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Production of 18 Ne ions for e 20
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Production of 18 Ne ions for e 21
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Testing at ISOLDE: Towards MEGAPIE Antecedants: The MEGAPIE Project: CERN-INTC /INTC-P-171 (& CERN-INTC ): Measurement of Gas and Volatile Elements Production Cross Section in a Molten Lead-Bismuth Target. Motivation: Evaluate requirements for cover gas system during normal operation and obtain data to assess accidental scenarios. Measurements & results # : Three runs between 2004 & 2005, 1.0 & 1.4 GeV, °C. Release of noble gases: He, Ne, Ar, Kr, Xe. Release of volatiles: Hg, Br, I. Significant yields of At isotopes observed; despite no-release of Po isotopes from LBE at typical operating temperatures, small amounts of Po can be liberated indirectly as decay daughters of released At. FLUKA or MCNPx with the INCL4/ABLA models more satisfactory than MCNPx with standard Bertini/Dresner model 22 MEGAPIE: First MW-class liquid metal spallation target: Aug-Dec 2006 # Y. Tall et al., Volatile elements production rates in a proton-irradiated molten lead-bismuth target, International Conference on Nuclear Data for Science and Technology 2007, DOI: /ndata:07762.
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 e.g. Measurements vs Simulations: Xe 23 # Y. Tall et al., Volatile elements production rates in a proton-irradiated molten lead-bismuth target, International Conference on Nuclear Data for Science and Technology 2007, DOI: /ndata: MEGAPIE project
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Production in Sodium I/III GeV2.5 GeV1.4 GeV converter IsotopeAZ/primError/primError/primError 1H1H E H2H215.23E E E H3H312.13E E E He322.01E E E He E E He621.59E E E He827.30E E E+000
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Production in Sodium II/III GeV2.5 GeV1.4 GeV converter IsotopeAZ/primError/primError/primError 19 Na E E E Na E E E Na E E E Na E E E Na E E E Na E E E Most relevant Na isotopes for maintenance and disposal: 22 Na, T 1/2 = yrs. 24 Na, T 1/2 = hrs.
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Production in Sodium III/III GeV2.5 GeV1.4 GeV converter IsotopeAZ/primError/primError/primError 17 Ne E E Ne E E E Ne E E E Ne E E E Ne E E E Ne E E E Ne E E E
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Experimental Setup Two phases, two targets: First phase: sodium/fluorine eutectic such as NaF-ZrF4. Second phase: pure sodium target. Standard ISOLDE liquid metal target container: Container used for lead or lead-bismuth eutectic. Tungsten converter. Temperature-controlled condensation helix. Vadis ion source. Measures taken online to assess potential splashing effects of liquid metal due to pulsed proton beam (should be > order of magnitude less severe than in lead targets). Measurements: Faraday cup (stable elements). Online -counting and spectrometry at tape station. Collection on foils and offline spectrometry (e.g. long-lived 7 Be). 27
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Beam request 12 Shifts online: 6 shifts with a sodium/fluorine eutectic target (first). 6 shifts with a pure sodium target (second). Only measurements with tape station require the use of the central beamline. Large fraction of measurements can therefore be performed in the GLM/GHM beamlines fully in parallel with another experiment using all remaining protons at the HRS. 2 shifts offline: Ionisation efficiency calibration with gas mixtures and stable tracers. 28
page Production and Release of Gas and Volatile Elements from Sodium- based Targets E. Noah, 38 th Meeting of the INTC, 4 th November 2010 Summary Motivation: Sodium used as coolant of tungsten target in an ESS target concept. Sodium-based molten salt used for production of 18 Ne in beta beam facility. Test programme at ISOLDE: Two targets: sodium-fluorine eutectic, pure sodium. Measure production and release of wide range of isotopes: He -> Mg. Beam request: 12 shifts online. 2 shifts offline. 29