A compact, pre-bunched Free Electron Laser facility named as Delhi Light Source (DLS) is presently under construction at Inter University Accelerator Center (IUAC). The accelerator facility, the complete beam line and the experimental facilities are being accommodated in a class 10000 clean room. A low emittance pulsed electron beam will be produced by a photocathode based normal conducting RF gun (figure 1) operating at 2860 MHz and will be injected into a compact undulator to produce THz radiation. The Klystron and Modulator systems are being commissioned at IUAC (Figure 2). Beam optics calculations were performed with the GPT and GICOSY codes. Another code, developed in-house, based on Lienard-Wiechert potential formulation, is used to calculate the parameters of the THz radiation emitted from the wiggling electrons inside the undulator. The design of the laser system has been completed and the system is being developed in collaboration with KEK, Japan.
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