HYPERION review

 

10/7/2024

Experiment principle

  1. Impose partial pressure of H on one side
     
  2. H permeates through the salt
     
  3. Measure the desorption flux on the other side

FLiBe

Experiment principle

  1. Impose partial pressure of H on one side
     
  2. H permeates through the salt
     
  3. Measure the desorption flux on the other side
     
  4. Fit with the master curve to identify \( \Phi \) and \(D\)
     
  5. 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...