HIAF Fragment Separator(HFRS)is the only beam line that connected Booster Ring(BRing)and Spectrometer Ring(SRing)in the HIAF and used to transfer both the primary ion beams and secondary radioactive beams.The beam passed once in HFRS so low vacuum degree was required.But HFRS connects with extremely high vacuum systems of BRing and SRing,so it is related to the gradual transition of pressure,the vacuum pressure can’t be too high.Taking into account the above situation,the vacuum degree of HFRS should be better than 1×10^(−7)mb.
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