Design and Beam Dynamics Studies for 5 GeV Electron Linac in CLIC Positron Source

CLIC (Compact Linear Collider) and ILC (International Linear Collider) are the two future linear collider projects after LHC (Large Hadron Collider) era. Both are planning to accelerate electrons and positrons to collide at a centre-of-mass energy greater than 250 GeV. CLIC is foreseen to be constructed in several stages corresponding to different centre-of-mass energies. The first at 380 GeV would be followed by stages at 1.5 and 3 TeV. What makes CLIC unique is the two-beam acceleration scheme. Drive beam reaching a current of about 100 A at a beam energy of about 2.4 GeV is transported through the main linac tunnel and power both main electron and positron beams. One of the most important part is injection of main beams to the main linac tunnel. Electrons are produced by an electron gun and transport through different energy linacs to the main linac. For the positron production, 5 GeV electron beam is planned to be used by impinging to amorphous tungsten target. This thesis is based on the design and optimization of parameters as well as effect of instabilities on designed beamline for this 5 GeV electron linac for positron production chain.