Table 1.

Summary of measured and inferred positron parameters, compared with sources used for previously reported proof-of-principle positron wakefield acceleration experiments. ^∗Note that this value is the rms of a uniform distrubution with a width of 14 µm.

	Measured	Inferred	Muggli et al.22	Corde et al.23	Gessner et al.24
E (GeV)	0.6	0.6	28.5	20.3	20.3
${\sigma }_x$ (µm)	100	2.7	25	$<100$	50
${\sigma }_z$ (µm)	–	$\lesssim 4^{\ast }$	730	30–50	35
$\epsilon$ (nm)	480	15	$14\times 3$	$5\times 1$	7
$\overline{\epsilon }$ (µm)	560	18	$390\times 80$	$200\times 50$	300