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Beamline Parameters
- Electron beam energy: 25 to 76 MeV
- Temporal structure: Macropulse length: 3
microseconds
Macropulse repetition rate from under 1 PPS to 3 PPS.
Micropulse repetition period 12.25 ns or 24.5 ns.
Micropulse length variable from about 1 ps FWHM to 10 ps FWHM. - Electron beam charge: continuously variable.
Single micropulse charge from zero to a few nanoculombs.
Bunch train charge up to about 10 nanoculombs. - Emittance: depends on various conditions, e.g. peak current, gun field, microbunch length etc. At 1 nC we have measured the emittance at 2.6 mm mrad (rms normalized) at a bunch length of 10 ps FWHM. The local emittance (Slice Emittance) is smaller, measured 1.4 mm mrad for a slice out of the 1 nC bunch.
- Stability: (approx.) 1 ps in short term phase, 1% of beam diameter pointing, 1%-2% relative charge.
Some of the measured results below have been presented by D.T. Palmer, X.-J. Wang, R.H. Miller, I. Ben-Zvi, C. Pellegrini, J. Sheehan, J. Skaritka, H. Winick, M. Woodle and V. Yakimenko, Commissioning Results of the Next Generation Photoinjector, Proc. 7th Advanced Accelerator Concepts Workshop, Lake Tahoe, Oct. 13-18, 1996
- Electron bunch length (full width, ps) vs. charge for three rf phases.
- Measured normalized rms emittance as a function of the laser to rf phase at a constant laser enegy.
- Measured normalized rms emittance as a function of the charge at a constant laser to rf phase.
- Measured charge, pulse length and the resultant current as a function of the phase at a constant laser energy.
- Electron charge vs. laser intensity, various cathodes and cleaning conditions. The charge is in nano Coulombs, the UV (quadrupled YAG) laser energy in microJoules.
Magnetic Element Parameters
Aperture | Max Current | Volt. Drop | Slope | Eff. Length | |
---|---|---|---|---|---|
BEPC quad 1X | 40 mm | 25 A | 0.06 V/A | 22.1 G/cm/A | 10.4 cm |
BEPC quad 2X | 40 mm | 25 A | 0.1 V/A | 22.1 G/cm/A | 20.4 cm |
SLAC 1X | 28 mm | 10 A | 0.63 V/A | 178.0 G/cm/A | 10.16 cm |
SLAC 1X | 28 mm | 10 A | 1.1 V/A | 181.5 G/cm/A | 20.32 cm |
6Q40 "Small" | 40 mm | 10 A | 0.63 V/A | 50 G/cm/A | 7.6 cm |
Aperture | Maximum Current | Voltage Drop | Slope (see calibration curves) | Effective Length | |
---|---|---|---|---|---|
Dipole 20 deg.. | 60 A | 0.19 V/A | 52.4 G/A | 40.0 cm < | |
Spectrometer dipole 0-8 deg. | 30 mm | 24.0 cm | |||
Solenoid | 80 mm | 200 A | 0.1 V/A | 14.0 G/A | 19.5 cm |
Steering coils: | |||||
Inside solenoid IN/OUT | 40 mm | 1 A | 49.97/40.83 G/A | 10.2/10.5 cm | |
"Slim" trim | 70 mm | 4A | 25 G/A | 0.8 cm | |
"Old" trim | 5A | 7 G/A | 17 cm |