Thanks for these numbers! Can such pressures be attained by other means rather than permanent confinement? For example, the near wall pressure of a collapsing u

Thanks for these numbers! Can such pressures be attained by other means rather than permanent confinement? For example, the near wall pressure of a collapsing ultrasound bubble reaches about 100 MPa. Three orders of magnitude too little but can this technology be used to achieve much higher pressures? If so I wonder if maintaining an aggregate of material at high pressure (a high pressure foam as it were) would be sufficient to achieve bulk superconductivity.