 In addition to using a ribbed beam screen designed to minimize secondary electron emission, the effect can also be reduced by in-situ electron bombardment.This is done in the LHC by circulating a special non-science "scrubbing" beam that is specifically designed to generate as many electrons as possible within the constraints of heat dissipation and beam stability.This technique was tested during Run 1, and will be used to allow operation at 25 ns bunch spacing during Run 2 (2015–2018).