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Stress in tungsten target

Goran Skoro . Stress in tungsten target. Tungsten cylinder (operating at 2000 K). Only difference (simulations vs. ISS baseline) is the beam energy value (6 instead 10 GeV) . TUNGSTEN.

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Stress in tungsten target

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  1. Goran Skoro Stress in tungsten target

  2. Tungsten cylinder (operating at 2000 K) • Only difference (simulations vs. ISS baseline) is the beam energy value (6 instead 10 GeV) TUNGSTEN • The target is bombarded at 50 Hz by a proton beam (4 MW power) consisting of 4x2ns long bunches in a pulse with length from 1 to 80 s. 17cm • The target material exposed to the beam is 17 cm long and 2(6) cm in diameter. 2cm micro-pulse macro-pulse Beam energy = 6 GeV ISS baseline (April 2006): 4 MW, 10 GeV, 50 Hz, 4 bunches per pulse, 2 ns rms.

  3. Power = 4 MW, repetition rate = 50 Hz, Beam energy = 6 GeV (parabolic distribution) Stephen Brooks’s MARS calculations Energy deposition in tungsten target Radius Temperature rise per pulse [K] Length [cm] Input for thermal stress calculations (LS-DYNA) Here, beam radius = 1cm, rod radius = 1cm 2nd case analysed: beam radius = 1cm, rod radius = 3cm NB. Stephen has produced results for 0.1cm and 0.3cm beam radius values, too. Temperature rise in tungsten for 0.3cm beam radius reaches 1100 K per pulse at the centreline of the target (assuming 4 MW, 50 Hz).

  4. Results Beam radius = 1cm, Rod radius = 1cm Beam radius = 1cm, Rod radius = 3cm Macro pulse length [s] Peak Von Mises Stress [MPa] supported LS-DYNA Comment. Bigger radius really reduces peak stress in the target but we have ‘significant’ reduction (~2x) only for short macro-pulse length (where radial stress contribution dominates).

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