FNPL Parameters

Predicted performance of Injector II.

Parameter	Predicted Value
Before Compression
Bunch Charge	8 nC = 5 · 1010e-
Laser pulse length FWHM	28 ps
Launch Phase (w.r.t. Ez = 0)	45°
Beam radius at cathode	3.0 mm
Peak field on cathode	35 MV/m
Post-Gun Gamma	8.5
Post-Linac Gamma	35.7
Transverse Emittance, normalized	11 mm mrad
Longitudinal Emittance (100% RMS)	820 deg keV
Momentum Spread	4.2%
Bunch Length	4.33 mm
Peak Current	276 Amperes
After Compression, from theory
Transverse Emittance, normalized	15 mm mrad
Bunch Length	1 mm
Peak Current	958 Amperes
After compression, from PARMELA
Transverse Emittance, normalized	26 mm mrad
Bunch length RMS	0.5 mm
Momentum spread RMS	4.3%
Longitudinal Emittance	760 deg keV

Source:

D. A. Edwards, Editor, “TeSLA Test Facility Linac--Design Report,” Report TeSLA 95-01, DESY, Hamburg, Germany (March 1995), p. 97.