V. Volkov

Rossendorf SRF‐Gun Cavity Characteristics

At the Forschungszentrum Dresden‐Rossendorf the development and the setup of the 2nd superconducting radio frequency photo electron injector (SRF‐Photo‐Gun) is finished. This new injector is placed next to the existing thermionic gun of the superconducting linear accelerator ELBE. A connection between the accelerator and the SRF‐Gun will provide improved beam parameters for the users at the second half of 2009. At the moment the commissioning is fully under way. We will report on important results concerning cavity commissioning like measurements of: Q vs. E, microphonics, Lorentz detuning, tuner parameters, pressure sensibility and in‐situ fundamental mode field distribution calculated from measured pass band.

CW 100 mA Electron RF Gun for Novosibirsk ERL FEL

Measured rf gun characteristics Average beam current, mA ≤100 Cavity Frequency, MHz 90 Bunch energy, keV 100 ÷ 400 Bunch duration (FWHM), ns 0.06 ÷ 0.6 Bunch emittance, mm mrad 10 Bunch charge, nC 0.3 ÷ 1.12 Repetition frequency, MHz 0.01 ÷ 90 Dark Current Impurity, mkA 0 Radiation Dose Power, mR/h 100/2m Operating pressure , Torr ~10-9-10-7 Cavity rf loses, kW 20 The most powerful in the world Novosibirsk CW FEL driven by ERL can be more powerful by an order of magnitude with this RF Gun

Novosibirsk Free Electron Laser: Terahertz and Infrared Coherent Radiation Source

High-power free electron laser (FEL) facility NovoFEL has been created at Budker INP. Its wavelength can be tuned over a wide range in terahertz and infrared spectrum regions. As a source of electron bunches this FEL uses multi-turn energy recovery linac which has five straight sections. Three sections are used for three FELs which operate in different wavelength ranges (the first one 90-240 microns, the second 37-80 microns and the third 5-20 microns). The first and the second FELs were commissioned in 2003 and 2009 respectively. They operate for users now. The third FEL is installed on forth accelerator track which is the last one and electron energy is maximal here. It comprises three undulator sections and 40 m optical cavity. The first lasing of this FEL was obtained in summer, 2015. The radiation wavelength was 9 microns and average power was about 100 watts. The designed power is 1 kilowatt at repetition rate 3.75 MHz. Radiation of third FEL has been delivered to user stations recently. The third FEL commissioning results as well as current status of the first and second FELs and future development prospects are presented. OVERVIEW OF THE NOVOSIBIRSK FEL