SYNOPSIS 夏 nthe present study , we are looking fbr a Iow cost and highly e 伍 cient system . ifseveral T{)kyo Tech beam down systems are placed a(ljacently ( multi − tower system ) , it is expected that utilization e伍 ciency of heliostats will increase by using of optimum layout and operation . In this repor し we show the superiority ofthe multi − tower beam down system . For that , we simulate heliost 飢 field e 幵iciency in a layout of repeated equilateral triangles and calculate the variation

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... the receiver incidence power on both multi − tower control and single − tower control by using TSUBAME − sol ( multi − purpose solar concentration simulator ) . ln the res 嘘 , we find that m 臓 i − tower cGntrol is more effeCtive than the single − tower contro ]as the heliostat field ee 石ciency and the receiver incidence increases about 10% in average and 20% tops.