  The recently demonstrated x-ray scattering approach using a free electron
laser with a high field pulsed magnet has opened new opportunities to explore
the charge density wave (CDW) order in cuprate high temperature
superconductors. Using this approach, we substantially degrade the
superconductivity with magnetic fields up to 33 T to investigate the onset of
CDW order in YBa$_2$Cu$_3$O$_x$ at low temperatures near a putative quantum
critical point (QCP) at $p_1\sim $ 0.08 holes per Cu. We find no CDW can be
detected in a sample with a doping concentration less than $p_1$. Our results
indicate that the onset of the CDW ground state lies inside the zero-field
superconducting dome, and broken translational symmetry is associated with the
putative QCP at $p_1$
