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Status Report on 18Ne Production for Beta Beams Using NaF-Based Molten Salt Technology

This report details the progress on the production of 18Ne for beta beam experiments, inspired by methodologies used for 18F production in PET imaging. Key topics include the development of a NaF target loop and molten salt systems for efficient ion production. Through collaborative research, we validated concepts regarding thermal stability and reactivity of various salt compositions at CERN/ISOLDE. The report outlines both offline tests and future plans for online validation. This work aims to refine target technology for improved beam production.

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Status Report on 18Ne Production for Beta Beams Using NaF-Based Molten Salt Technology

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  1. Beta beams: Ion production status report T.M. Mendonça1, R. Hodak2, M. Allibert3, V. Ghetta3, D. Heuer3, E. Noah4, T. Stora1 1 CERN 2 ComeniusUniversity 3 LPSC Grenoble 4 DPN, Univ. Genève

  2. 18Ne productionfor the beta beams A proposalinspiredfrom18F production for PET imaging NaF target loop (23Na(p, X)18Ne, 19F(p,2n)18Ne) 7.5x24x15cm 2.1 L/s T. Stora, P. Valko 6mA 160MeV NaF:ZrF4at600ºC orNaF:LiFat 700ºC Validationoftheconcept: -StaticmoltensaltunitatCERN/ISOLDE (IS509) -Moltensaltloop Transferline to ionsource 40x15x15cm

  3. Staticmoltensaltunit Productionof18Ne beamsbasedonthe ISOL technique Primarybeam Target andionsourceunit

  4. SinceLegnaro… • Some studiesperformed: • Thermalstabilityof NaF:ZrF4 (does ZrF4sublimateattemperaturesrelevant for operatingconditions?) • ThermalstabilityofNaF:LiF • Preparationofstatic target unit for online validation in June 2012 at ISOLDE

  5. Saltcomposition? ZrF4 LiF NaF • Check for: • Reactivitywithatmosphere • Thermalstabilityattemperaturesrelevant for operatingconditions • Corrosioneffects Highvapourpressurefor ZrF4

  6. NaF:ZrF4 vs. NaF:LiF Eutecticwithmeltingpointsat 649ºC 500ºC Source: http://pubs.acs.org/doi/pdf/10.1021/j150564a008

  7. Synthesisandcharacterizationoffluoridesalts Mixtureof stoichiometric quantitiesofinitialfluorides Thermaltreatment in graphitecrucibleupto meltingpoint (undervacuum) All handling andmanipulation in gloveboxesundercontrolledargonatmosphere NaF:LiF NaF:ZrF4 Differentialscanningcalorimetry (DSC) (Collab. M.Taborelli ,TE-VSC-SCC) SEM/EDS analyses (Collab. S. Sgobba, EN-MME-MM)

  8. NaF:ZrF4:thermalstability offline tests #1: Fillingofstainlesssteelcontainerwithsalt in moltenstate Replica ofstatic target container in stainlesssteel • Temperaturemeasurementwithtwothermocouples: • - atthefunnel (contactwithsalt) • atthecenterofthe metal container (external)

  9. #2: Refusionofsaltunder normal operationconditions Thermocouples Pressurevariationduringfusion

  10. #3: Condensationefficiencyandmasslosses No residual salt in thechimneywalls Saltcondensed in thehelix (~4% oftheinitialmass)

  11. NaF:LiF:thermalstability offline tests • Chimneywithcondensationhelix • Graphitecontainerwithsalt • Metalliccontainer for heating • Temperaturemeasurementwithtwothermocouples: • - atthe top ofthechimney • atthecenterofthe metal container (external) • No masslossesatrelevanttemperatures for operatingconditions • Thermalstabilityconfirmed

  12. Future plans #1: Static target unitpreparation - Containerin fluorideresistantalloy (Haynes 242) (CernMain Workshop, EN-MME-MS) - Improvedgeometry (includingcondensationissues) #2: Online validationoftheNaF:LiFmoltensalt using a staticunitat ISOLDE (June 2012) Thankyou for theattention!

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