Wp7 1 transnational access to jo ef stefan institute slovenia
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WP7.1 Transnational Access to Jo žef Stefan Institute Slovenia. Marko Miku ž Jožef Stefan Institute Ljubljana, Slovenia. The Facility. TRIGA-Mark-II I reactor ( 1966) hot-cell laboratories and various neutron irradiation facilities. r eactor power 250 kW

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WP7.1 Transnational Access to Jo žef Stefan Institute Slovenia

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Wp7 1 transnational access to jo ef stefan institute slovenia

WP7.1TransnationalAccess to Jožef Stefan InstituteSlovenia

Marko Mikuž

Jožef Stefan Institute

Ljubljana, Slovenia


The facility

The Facility

  • TRIGA-Mark-III reactor (1966)

    • hot-cell laboratories and various neutronirradiation facilities.

    • reactor power 250 kW

    • maximum total flux is 4x1012 cm-2s-1 (central channel).

    • several in-core and ex-core irradiation channels

    • maximum uninterrupted irradiation time is 16h.

    • described in detail in: http://www.rcp.ijs.si/ric/description-a.html

M.Mikuž: AIDA WP7.1


Types of irradiation

Types of irradiation

  • In-core(fast&thermalneutrons)

    • flux 1-4 x1012 cm-2s-1

    • Hardness factor ~0.9

    • Sample size < 20x7x1 cm3

  • Dry chamber (thermalneutrons, regenerated fast neutrons)

    • flux<5x108 cm-2s-1

    • Bigger samples possible

  • In-coreoff mode (gamma)

    • secondary radiation of the core when reactor is off

    • monitored with RADFETS

    • 50 Rad/s max, levels off at 20 Rad/s

M.Mikuž: AIDA WP7.1


Core irradiation channels

Core Irradiation Channels

  • Mainly used for high fluence irradiations

    • Triangular channel (TIC)

    • F-19 channel

    • ~1016 cm-2 in one hour at full power

    • Lower fluences at trimmed reactor power

    • Dosimetry with 10 % accuracy

M.Mikuž: AIDA WP7.1


Core irradiation channels cont

Core Irradiation Channels (cont)

  • Spectrum well known

    • Threshold activation dosimetry agrees with reactor modeling simulations

    • Thermal to fast neutron fluxes approximately equal

      • Activation

      • Strict material budget

  • Dosimetry techniques

    • Threshold activation

    • Leakage current in Si diodes (NIEL)

    • Time of irradiation

M.Mikuž: AIDA WP7.1


Dry chamber

Dry chamber

  • Dry chamber

    • Thermal neutrons

    • Fission plate regenerator

      • Weapon grade 235U plate

    • Bigger samples

      • Cooling, power, readout possible

    • Fluences limited to ~1012-13 cm-2

M.Mikuž: AIDA WP7.1


In core off mode

In-core off mode

  • A convenient gamma source

    • Delayed decays of fission products

    • Samples dropped into core during reactor off time

      • Can be retracted during running to avoid neutrons

    • Persists for days

      • 20 kGy (2 Mrad) per day

    • Can be used to complement NIEL

      • But no way to get to few MGy

M.Mikuž: AIDA WP7.1


History

History

  • Heavily used by RD-48 and RD-50 from the late 90’s on

    • Effectively the reference site for neutron irradiations

    • Up to 2000 samples irradiated per year

      • Mostly diodes and mini-detectors

    • 142 NIM papers mentioning “Ljubljana reactor” in Science Direct database

M.Mikuž: AIDA WP7.1


Aida projects

AIDA Projects

  • Transnational access covers (over 4 years)

    • 90 projects,

      • 6 hours per project

      • 540 h total

    • 54 visits

      • 30 % of irradiations

      • 2 persons per team

      • 3 days duration

    • Shipment of radioactive samples

      • 40 projects, 500 EUR each

  • Ready to accept projects as of now !

    • People knocking on our door

  • Mail to: [email protected] or [email protected]

M.Mikuž: AIDA WP7.1


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