Does One Know the Properties of a MICE Solid or Liquid Absorber toBetter than 0.3 Percent?

Abstract

This report discusses the report discusses whether the MICE absorbers can be characterized to ±0.3 percent, so that one predict absorber ionization cooling within the absorber. This report shows that most solid absorbers can be characterized to much better than ±0.3 percent. The two issues that dominate the characterization of the liquid cryogen absorbers are the dimensions of the liquid in the vessel and the density of the cryogenic liquid. The thickness of the window also plays a role. This report will show that a liquid hydrogen absorber can be characterized to better than ±0.3 percent, but a liquid helium absorber cannot be characterized to better and ±1 percent.

Performance of the MICE diagnostic system

“…The pressure at which the absorber operated resulted in deflection of the absorber windows. These deflections were modelled using ANSYS [46], and the uncertainty in the window deflection derived from this model was 20%. The model showed a linear dependence of the window deflection on pressure up to 2 Bar when the windows begin to yield.…”