HYPERION review
10/7/2024
Experiment principle
- Impose partial pressure of H on one side
- H permeates through the salt
- Measure the desorption flux on the other side
FLiBe
Experiment principle
- Impose partial pressure of H on one side
- H permeates through the salt
- Measure the desorption flux on the other side
- Fit with the master curve to identify \( \Phi \) and \(D\)
- Repeat for different temperature
FLiBe
\mathrm{downstream \; flux} = \frac{P_\mathrm{up} \Phi}{L} \left(1+2 \sum_{n=1}^{\infty} \left(-1\right)^{n} e^{- t\frac{\pi^{2}n^{2} D}{L^{2}}}\right)
Experiment principle
FLiBe
Metal layer
Gas handling system
- Delivers hydrogen to the upstream volume
- Sweep the downstream volume with argon
- Delivers calibration gas to the GC
First dry runs outside of the glovebox
Detectability issues
The cell was moved in the glovebox
Higher temperatures helped increase the data-to-noise ratio
Leaks still appear sometimes
The concentration measurement is temperature dependent
Main hypotheses:
- Leak
- permeation through piping
Potential solution:
- Calibration at different temperatures (if reproducible)
Permeation cell failure
- Temperature cycling + high upstream pressure
- Repair attempt failed
Future experiments will use pure H/D and lower pressures.
Modelling and analysis
Two approximations can be made
Easy!
Not easy!
We tested all cases and found these approximations to be invalid
Not sufficient to explain literature uncertainties
Paper in progress...
deck
By Remi Delaporte-Mathurin
