Electron and Optical Physics Division

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Far Ultraviolet Physics Group / Synchrotron Ultraviolet Radiation Facility SURF III

The Far Ultraviolet Physics Group maintains and improves the Synchrotron Ultraviolet Radiation Facility SURF III.

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  SURF Parameters

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Typical SURF III Accelerator Parameters

Variable Parameters

Main Coil Current 20 A < IMC < 900 A 725 A
Magnetic field index 0 < n < 3/4 0.594
RF Gap Voltage -2 kV > VRF > -20 kV -19.0 kV
Electron beam current 100 mA <. IB <. 400 mA 100 mA

Fixed & Derived Parameters

RF Frequency νRF 113.845 MHz
Harmonic Number (Number of bunches) Harmonic Number 2
Orbital Frequency $\nu_0 = \frac{\nu_{RF}}{h} $ 56.923 MHz
Electron Energy E0 361.804 MeV
Gamma factor $\gamma =\frac{E_0}{m_eC_I^2}$ 708.033
Beta factor $\beta \sqrt{1-\gamma^2}$0.999999
Orbital radius $\rho_0 = \frac{\beta \, C_I \, h}{2\pi \,\nu_{RF}}$ 828.214 mm
Characteristic wavelength $\lambda_c = \frac{4\pi \, \rho_0}{3 \lambda^3}$ 9.892 nm
Magnetic Flux Density Magnetic Flux Density 1.44 T
Number of electrons $ N_e = \frac{I_B \, 2\pi\, \rho_0}{e_0 \, \beta \, c}$ 10964841418
Energy loss per turn $U_0 = \frac{e_0^2 \, \gamma^4}{3\varepsilon_0 \, \rho_0}$ 1808.414 eV
Radiated power per electron $P_\gamma = \frac{c_I \, e_0^2 \, \gamma^4}{6\pi \,\varepsilon_0 \, \rho_0}$ 16.493 nW
Total radiated power $P_{\rm tot} - N_e \, P_\gamma$ 181.842 W
Synchrotron Oscillation frequency $u_s = \nu_0 \sqrt{\frac{h e_0 V_{\rm RF}\cos(\psi_s)}{2\pi \beta E_0(n-1)}}$ 364.418 kHz
Natural energy spread $\frac{\sigma_E}{E_0}=\sqrt{\frac{C_q \gamma^2}{\rho_0}\frac{1-n}{3-4n}}$ 0.0386 %
 

Return to: Physicsl Measurement Laboratory | Electron & Optical Physics Division | Synchrotron Ultraviolet Radiation Facility

Online: May 2002   Last update: June 2003
Uwe Arp.