Fusion Exhaust Gas Analysis
Quadrupole RGAs are common in fusion labs, but they are not built to resolve the most important light-isotope conflicts in DT and D-He3 work. BSI's FT-ICR targets those mass 3 and 4 separations directly.
A quadrupole residual gas analyzer is a practical vacuum diagnostic, but the hardest fusion questions are not just about detecting a nominal mass peak. DT fuel ratio, tritium accountability, helium ash, and D-He3 research require separating species that sit extremely close together in mass.
At m/z 3, He-3, HD, and HT can overlap in ways that make simple peak assignment unreliable. At m/z 4 and nearby channels, He-4, D2, DT, and HT-related species create additional ambiguity. Standard RGAs often have resolving power in the single digits at these masses.
FT-ICR resolution scales favorably at low mass. BSI's compact instrument is designed for resolving power greater than 10,000 at mass 3 and 4, which is exactly where fusion exhaust and fuel-accounting questions become difficult.
BSI's FT-ICR should be thought of as the high-resolution isotope layer, not as a replacement for every pressure gauge or vacuum monitor. It is most relevant when the decision depends on isotope identity, fuel ratio, tritium accountability, helium ash, or D-He3 campaign analysis.
The likely buyer is not a general purchasing office looking for a commodity RGA. The fit is a diagnostics engineer, tritium systems lead, fuel-cycle team, or lab manager who already knows that mass 3 and 4 ambiguity is limiting the quality of operational data.
Data For Decisions
| Capability | Quadrupole RGA | BSI FT-ICR |
|---|---|---|
| Resolving power at m/z 3-4 | Often about R 4-10 | R > 10,000 |
| He-3 / HD / HT distinction | Not reliable | Designed for separation |
| He-4 / D2 / DT ambiguity | Often unresolved | High-resolution low-mass analysis |
| Size | Small vacuum instrument | Compact tabletop FT-ICR |
| Cost class | Lower | $180k+ preorder |
Direct Answers
Yes. Any DT campaign that depends on accurate hydrogen isotope and helium species accounting needs more resolution than a basic RGA can provide.
No. RGAs remain useful for routine vacuum monitoring. BSI's FT-ICR is for the isotope-resolution layer that RGAs cannot provide.
Private fusion teams and national labs face the same measurement physics when they move toward DT campaigns, tritium handling, or D-He3 fuel-cycle research.
Next Step
If your fusion program is using an RGA for mass 3 or mass 4 decisions, ask BSI whether FT-ICR resolution belongs in the diagnostic stack.