A novel lithium evaporator for the controlled introduction of lithium into tokamaks for wall conditioning is described. The concept uses a Li granule injector with a heated in-vessel yttrium crucible to evaporate a controlled amount of Li onto tokamak plasma facing components for wall conditioning purposes. The evaporator thermal mass is low and the evaporation/cool down time is short (about a minute) and avoids the need for complicated shutters to control the evaporation.
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