CaGaS Phase II is a repeat of capture gamma energy spectroscopy experiments performed during the summer of 2021 in the ISU clean room. The purpose of revisiting the capture gamma experiment is to use a new, higher activity ²⁵²Cf source (U2-622) and to investigate different thicknesses of Gadolinium foils and the effect on the high energy photon flux produced. This work is being performed in support of the main conversion process for the In-Situ Positron Annihilation Spectroscopy experiment being designed and performed by INL staff and external collaborators.

Impromptu To Do List

Investigate the difference with/out PUR (pile up rejection) enabled on spec amp
- Look for differences with high count rate source

Build shielded tunnel for Gd optimal thickness measurements
- Both Gd powder and foils
- Design and print holders for foils and powder
- Measure up as close to Gd as possible and then ~12" away to calculate the adjustment factors necessary for coincidences