• J.W. Amann, R. Arnold, A. Seryi, D.R. Walz
  SLAC, Menlo Park, California
• K. Kulkarni, P. Rai, P. Satyamurthy, V. Tiwari
  BARC, Mumbai
• H. Vincke
  CERN, Geneva

Sig­nif­i­cant progress has been made in the de­sign of an 18MW Beam Dump for 500 GeV elec­tron/positron beams at an ILC. The beam dump de­sign is based on cir­cu­lat­ing water with a vor­tex-like flow pat­tern to dis­si­pate and re­move the en­er­gy de­posit­ed by the beam. Mul­ti-di­men­sion­al tech­nol­o­gy is­sues have been ad­dressed to de­sign the beam dump sys­tem. De­tailed ther­mal-hy­draulic anal­y­sis was car­ried out in all the crit­i­cal re­gions of the beam dump which in­clude, 1) lo­ca­tion of high­est vol­u­met­ric power de­po­si­tion by the beam, 2) lo­ca­tion of high­est lin­ear power de­po­si­tion, 3) en­trance win­dow re­gion, 4) ves­sel walls etc. Based on this anal­y­sis, the siz­ing of the beam dump and its com­po­nents, water flow rate and inlet jet ve­loc­i­ty, op­ti­mum lo­ca­tion of the beam path in the beam dump, beam sweep ra­dius etc have been es­ti­mat­ed. In ad­di­tion, pre­lim­i­nary me­chan­i­cal de­sign of the beam dump, cool­ing cir­cuit de­tails, siz­ing of the hy­dro­gen/oxy­gen re­com­bin­er sys­tem, ion ex­change and 7Be re­moval, prompt and resid­u­al ra­dioac­tiv­i­ty stud­ies etc have been car­ried out. De­tails of this work will be pre­sent­ed.