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Antiprotons are produced at CERN by colliding a 26 GeV/c proton beam with afixed target made of a 3 mm diameter, 55 mm length iridium core. The inherentcharacteristics of antiproton production involve extremely high energydepositions inside the target when impacted by each primary proton beam, makingit one of the most dynamically demanding among high energy solid targets in theworld, with a rise temperature above 2000 {\deg}C after each pulse impact andsuccessive dynamic pressure waves of the order of GPa's. An optimized redesignof the current target is foreseen for the next 20 years of operation. As afirst step in the design procedure, this numerical study delves into thefundamental phenomena present in the target material core under proton pulseimpact and subsequent pressure wave propagation by the use of hydrocodes. Threemajor phenomena have been identified, (i) the dominance of a high frequencyradial wave which produces destructive compressive-to-tensile pressure response(ii) The existence of end-of-pulse tensile waves and its relevance on theoverall response (iii) A reduction of 40% in tensile pressure could be obtainedby the use of a high density tantalum cladding.

CERN antiproton target: hydrocode analysis of its core material dynamic response under proton beam impact