Table 2.

Settings of key operating parameters for (i) LOOPINO-3—loop test measurements (without WGTS; unpublished results); (ii) FT—first tritium campaign, with reduced tritium content [21]; and (iii) KNM1—first KATRIN neutrino mass data taking [22].

Parameter/Setting		Units	LOOPINO	FT	KNM1
Pressure in LARA Cell, pRC		mbar	149	190	190
Tritium content in the gas mixture, εT			~0.93	~5 × 10−3	>0.97
Column density, ρd (fraction of nominal ρdmax)		%	n/a	~100	25
Laser power, PL		W	1.5	4.0	3.0
Spectral line resolution (FWHM),	$\Delta \lambda$	nm	1.15	1.15	1.15
	$\mathsf{\Delta }\tilde{\nu }$	cm−1	28.2	28.2	28.2
CCD acquisition time (single spectrum), tSS		s	58.5	58.5	58.5