positioned specifically the cooling channel 112 has a plurality of relatively straight regions 112 b that are connected by a plurality of curved regions 112 a fig1 the curved regions 112 a are curved about 180 degrees and are connected in an alternating pattern such that the straight regions 112 b form a generally uniform and parallel pattern the straight regions 112 b are positioned in the recessed areas 116 a of the plate member 116 while the alternating curved regions curve around a recessed end area 1166 since the recessed areas 116 a are located at the edge of the plate member 116 the cooling channel 112 are provided room to longitudinally expand and contract during heating and cooling without imparting undue stress on the plate assembly 102 components the cooling channel 112 is further held against the plate member 116 by a plurality of clamp plates 114 as seen in fig5 each clamp plate 114 includes a relatively straight groove 114 a having a rounded bottom shaped with a similar arc to that of the cooling channel 112 and thereby allowing the clamp plate 114 to mate with the straight region 112 b of the cooling channel 112 in this respect the groove 114 a and the recessed area 116 a form an enclosed passage for the cooling channel 112 further the use of screws 118 to secure the clamp plates 114 further reduces any stress related damage that might be.