Basic features of coherent radiation generated by relativistic charge bunches

ELECTRO OPTICAL SAMPLING OF COHERENT SYNCHROTRON RADIATION FOR PICOSECOND ELECTRON BUNCHES WITH FEW pC CHARGE

Electro Optical (EO) sampling is a promising nondestructive method for measuring ultra short (sub-ps) electron bunches. The FEMTO slicing experiment at the Swiss Light Source modulates about 3 pC of the 5 nC electron bunch longitudinally. The coherent synchrotron radiation (CSR) emitted by this substructure was sampled by 100 fs long pulses from an Yb fiber laser in EO crystals of gallium phosp...

Relativistic Electrons and Coherent Radiation

Introduction to Impedance For Short Relativistic Bunches ?

We will consider the cavity shown in Fig. (2.1) which has rotational symmetry about the z axis and is excited by the beam current, IB, passing through the gap. For the time being, we will consider only one mode of excitation for the cavity; namely, the mode where the magnetic field ~ B is azimuthal around the beam direction as shown. The current IL flows in the outer cavity wall in the directio...

Coherent Radiation in Gamma-Ray Bursts and Relativistic Collisionless Shocks

We suggest that coherent radiation may occur in relativistic collisionless shocks via twostream Weibel instabilities. The coherence amplifies the radiation power by many orders [∼ 10 in Gamma-Ray Bursts (GRBs)] and particles cool very fast before being randomized. We imply (1) GRBs accompany strong infrared emission, (2) protons efficiently transfer energy to electrons and (3) prompt GRBs might...

Compression of High-charge Electron Bunches

The AØ Photoinjector at Fermilab can produce high charge (10-14 nC) electron bunches of low emittance (20 mmmrad for 12 nC). We have undertaken a study of the optimal compression conditions. Off-crest acceleration in the 9-cell capture cavity induces an energy-time correlation, which is rotated by the compressor chicane (4 dipoles). The bunch length is measured using streak camera images of opt...