Table 1. Properties of and conditions for producing GeV e-beams.

Shot*	Epeak (GeV)	% Energy spread (FWHM) of peak†	Angular divergence (FWHM)‡ at peak (mrad)	Charge in peak§ (pC)	Total charge§ (pC)	Plasma density|| ne (1017cm−3)	Laser pulse energy¶ Elaser (J)	Pulse duration** τ (fs)
a	2.0±0.1	10 (6)	0.6±0.1	63±8	540±60	4.8±0.1	100±5	160±10
b	1.8±0.1	8 (5)	0.5±0.1	34±5	400±50	3.4±0.1	120±6	150±10
c	0.95±0.1	11†† (7)	0.5±0.1	13±2	100±20	2.1±0.1	129±6	160±10

FWHM, full width at half maximum.

^*This table displays characteristics for the GeV electron beams shown in Fig. 2.

^†First number denotes FWHM of the spectral peaks in Fig. 2, column 4. Number in parentheses is a calculated spread after unfolding the contribution to the peak width originating from the angular divergence of the electrons in the energy dispersion plane, assumed equal to the divergence orthogonal to this plane given in column 4 of this Table.

^‡Error bars are due to pixelation of the angular divergence profiles and energy-dependence of the width within the high-energy peaks.

^§Determined from imaging plate data. Error bars reflect uncertainties in charge calibration as described in Methods.

^||Error bars reflect uncertainty in the calibration of the pressure sensor.

^¶Error bars reflect uncertainties in the percentage of light leaked to the energy metre and in the calibration of the meter itself.

^**Measured by single-shot autocorrelation. Error bars reflect variations in the width of the autocorrelation trace across the spatial profile of the pulse, and uncertainties in the temporal pulse shape assumed in deconvolving the autocorrelation trace.

^††Computed by doubling the half-width of the high-energy side of the peak.