Table 5.

Typical monitoring parameters for the gas composition in KATRIN: comparison of the specification requirements and the values achieved during first KATRIN neutrino mass data taking. Precision and trueness are given relative to their value, $\left|\Delta \mathrm{X}/\mathrm{X}\right|$.

		KATRIN Requirements (1)			Achieved during KNM1 (2)
Parameter		Value	Precision	Trueness	Value	Precision	Trueness
Concentrations, cx	for T2				0.95193	4.7 × 10−4	9.7 × 10−3
	for DT				0.01109	1.5 × 10−2	9.2 × 10−2
	for HT				0.03562	6.4 × 10−3	1.3 × 10−1
Tritium purity, εT		>0.95	1 × 10−3	3 × 10−2	0.97576	2.8 × 10−4	1.6 × 10−3
Ratio of impurities HT/DT, κ		---	---	10 × 10−2	3.212	2.5 × 10−2	3.3 × 10−2

⁽¹⁾ Originally defined in reference [13], amended in reference [15]. ⁽²⁾ From the “snapshot” sub-run data acquired on 26 April 2019 (see Figure 7).