if they pass through PSI and the proton pump multiple times it is called cyclic photophosphorylation.

When the electron reaches photosystem I, it fills the electron deficit of light-excited reaction-center chlorophyll P700 of PSI. The electron may either continue to go through cyclic electron transport around PSI or pass, via ferredoxin, to the enzyme NADP reductase. Electrons and protons are added to NADP to form NADPH. This reducing (hydrogenation) agent is transported to the Calvin cycle to react with glycerate 3-phosphate,