Cathode Validation Approach

Evidence

Engineering assessmentTest-record structureI-V dataProject-specific checks

Emitter

Thermal path

Ignition

Emission drift

Restart

Stage	Controlled variables	Measured record	Decision
Pre-test state	emitter material, insert geometry, storage, handling, contamination	assembly record and visual inspection	ready for activation
Thermal activation	ramp, soak, vacuum, heater/plasma power, gas state	temperature estimate, pressure log, power log	activation without overheating/contamination
Ignition	gas flow, anode gap, voltage/current sequence, pressure	start delay, voltage, current trace	repeatable start
Emission point	target current, pressure, thermal state	I-V curve and operating point	stable emission range
Drift	fixed operating point over time	ΔI/Δt, voltage drift, thermal drift	operational stability
Restart	cool-down, exposure history, gas/vacuum history	restart count and parameter shift	recovery after cycling

I-V curve, ignition voltage, discharge stability, current drift, pulse behaviour and noise.

heater/input power, radiative loss, conduction path, thermal inertia and emitter-temperature estimate.

base pressure, gas purity, flow stability, outgassing, residual gas where available.

emitter surface, deposits, insert condition, dimensional changes and contamination traces.

Condition	Reason
Only one ignition event	does not prove stability, repeatability or restart capability
No vacuum/gas log	emission behaviour cannot be separated from environment effects
No thermal history	activation route and emitter state are undefined
Current drift not measured	operational stability remains unknown
No post-test inspection	poisoning, deposits and material compatibility are not checked

Stage	Physical question	Record	Weak conclusion to avoid
Activation	Is the emitter state reproducible after thermal history?	Heating / activation log, vacuum/gas history.	Activation inferred only from one current point.
Ignition	Can the cathode start under defined geometry and environment?	I-V curve, anode distance, gas/vacuum state.	One start equals validated cathode.
Stability	Does emission remain stable at fixed operating condition?	Current drift, voltage drift, time record.	Short ignition test equals endurance readiness.
Restart	Is repeated start behaviour reproducible?	Restart sequence, success/fail record, post-test inspection.	No restart data but reliability assumed.

Record: I-V curve, drift at fixed point, restart sequence, gas/vacuum log, thermal history and post-test inspection.
Interpretation: Single ignition is separated from stable emission and restart reliability.
Project use: Cathode readiness cannot be concluded without stability, environment and repeatability records.