(57) An ultra-high pressure generator (70) includes: an intensifier (40) that discharges
pressurized fluid (F2) and has a double-acting drive cylinder (44) formed to have
a first chamber (41) and a second chamber (42) which are delimited by a piston (43)
driven by a working medium (F1), high pressure cylinders (451,452) which discharge
the pressurized fluid (F2), and plungers (461,462) which reciprocate with the piston
(43) in the high pressure cylinders (461,462); a closed-circuit working medium pump
(11) having a first port (111) and a second port (112) as suction/discharge ports
for the working medium (F1) ; a drive source (12) that drives the closed-circuit working
medium pump (11) ; a first working medium channel (32) that communicates the first
chamber (41) with the first port (111) ; and a second working medium channel (33)
that communicates the second chamber (42) with the second port (112), wherein the
closed-circuit working medium pump (11) sucks/discharges the working medium (F1) from/to
the first and second chambers (41,42) respectively via the first and second ports
(111,112) to drive the intensifier (40).
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