The invention relates to a loop heat pipe (100), comprising an evaporator (101) with an enclosure (101), an evaporator chamber (102), a primary capillary structure (104), and a plurality of grooves (114) in the primary capillary structure (104). The enclosure (101) of the loop heat pipe (100) has a heat receiving side and side walls (111) with openings (112) forming the evaporator chamber (102). The evaporator chamber (102) comprises the primary capillary structure (104) adjacent to the heat receiving side of the enclosure (101) and extending to the side walls (101) of the evaporator chamber (102). Each of the plurality of grooves (114) in the primary capillary structure (104) extends from an opening (112) in one of the side walls (111) to an opening (112) in the opposite side wall (111) and is configured to transport vapor from the primary capillary structure (104) to the openings (112).
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