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Goran Skoro . Tungsten target tests at the ISIS - part II -. ISIS Beam. Target. Dimensions. 2.5x10 13 protons per pulse; Pulse structure: Repetition rate 50 Hz; Beam energy = 0.8 GeV; Beam profile: parabolic; Beam radius = Target radius. 1.0 cm diameter; 15 cm length.

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Goran skoro l.jpg

Goran Skoro

Tungsten target tests at the ISIS- part II -


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Target

  • Dimensions

  • 2.5x1013 protons per pulse;

  • Pulse structure:

  • Repetition rate 50 Hz;

  • Beam energy = 0.8 GeV;

  • Beam profile: parabolic;

  • Beam radius = Target radius.

  • 1.0 cm diameter; 15 cm length

  • 1.5 cm diameter; 15 cm length

  • 100 ns

  • 100 ns

Material: Tungsten

  • 230 ns

  • To calculate:

  • Energy deposition in the tungsten target -------------------- MARS

  • Thermal model ---------------------------------------- ANSYS

  • Surface displacements, accelerations, peak stresses -------- LS-DYNA

  • Target activation -------------------------------------- FLUKA


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Surface accelerations, displacements, stresses …

Peak stress (Neutrino Factory, 4 MW, 2cm diameter, optimised pulse length) 300 MPa~ 2x lower than here

  • 1 x 15 cm target

  • LS-DYNA

  • 2.5x1013 protons per pulse, parabolic beam

  • Surface acceleration [106 m/s2] and displacement [m] as a function of z-position for initial temperature of 300 K

  • Peak von Mises stress = 587 MPa

  • * 1.5 cm is the distance where we have a maximal surface displacement


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Surface accelerations, displacements, stresses …

Peak stress (Neutrino Factory, 4 MW, 2cm diameter, optimised pulse length) 300 MPa

~ optimal dimensions ~

  • 1.5 x 15 cm target

  • LS-DYNA

  • 2.5x1013 protons per pulse, parabolic beam

  • Surface acceleration [106 m/s2] and displacement [m] as a function of z-position for initial temperature of 300 K

  • Peak von Mises stress = 287 MPa

  • * 1.5 cm is the distance where we have a maximal surface displacement


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Calculations of the target activation

  • Status (04/12/2007):

  • MCNP/MCNPX

  • FLUKA

  • Copy of the code has been ordered from OECD–NEA (France);

    - they are not quick (4-6 weeks) -

  • Licensing procedure in progress;

  • ‘Single-site/single-user’ licence (!)

  • First results (next slide)


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10 pulses

(1 hour between each two pulses)

Calculations of the target activation

1 pulse

Specific activity of the target [Bq/cm3]

Cooling time [h]

  • 1.5 x 15 cm target

  • FLUKA

  • 2.5x1013 protons per pulse, energy = 0.8 GeV

  • 10 minutes

  • 1 hour

  • 8 hours

  • 1 day

  • 1 week

  • 1 month


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Any intervention here:

wait at least Tc = 1 hour after each pulse;

(if Tc = 1 hour) total intervention time should not exceed 30 minutes

(2 mSv criterion).

A design criterion for high-radiation areas (at CERN, for example) =

2 mSv per person per intervention but must be below 20 mSv per year (category A workers)

100x higher than background rate;

7x higher than during London-Tokio flight.

scenario:

in contact (4);

no radiation self-absorption in the target;

<1 MeV>/decay; etc…

10 pulses

(1 hour between each two pulses)

A quick estimate of the effective dose rate

1 pulse

Effective dose rate [mSv/minute]

Cooling time [h]

  • 1.5 x 15 cm target

  • 2.5x1013 protons per pulse, energy = 0.8 GeV

  • 10 minutes

  • 1 hour

  • 8 hours

  • 1 day

  • 1 week

  • 1 month


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