1 / 7

Tungsten target tests at the ISIS - part II -

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.

karim
Download Presentation

Tungsten target tests at the ISIS - part II -

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Goran Skoro Tungsten target tests at the ISIS- part II -

  2. ISIS Beam 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

  3. 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

  4. 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

  5. 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)

  6. 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

  7. 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

More Related