CAESIUM FOUNTAIN CLOCK
The PTB’s caesium fountain atomic
clock will be 10x more accurate than
standard caesium atomic clocks
currently defining time worldwide.
At the center of the instrument,
caesium atoms are trapped and
cooled by 6 laser beams in a vacu-
um to be accelerated vertically and
to fall back down again.
During their flight an internal oscil-
lation is excited to achieve a pace-
maker of great accuracy.