[en] Experimental tests of a open-quotes second bunch length compressorclose quotes in a linac is important for the next generation of linear colliders and for other future accelerators. These future accelerators need bunches with lengths of order 0.06-0.2 mm. At these lengths, new accelerator dynamics will be encountered. The authors have studied the possibility of constructing a second compressor with the present SLAC linac and have found a reasonable design. The core of this project is to reconfigure an old beamline (BL-90) at the 1000m location in the linac to: (1) extract a 10 GeV bunch, (2) pass it through a new 96m long transport line in which length compression is done, and (3) reinject the beam into the main linac in an available drift section. Using the resulting compressed bunch, accelerator physics tests would be performed in the remaining downstream linac with the resulting very high charge density. The bunch compression in this transport line results from the TRANSPORT element R₅₆ as determined from the optics of the transport line. Δz = R₅₆ ΔE/E. For example, if Δz = -0.5 mm, ΔE/E = 0.5%, R₅₆ = -0.1 m, a bunch of 5 x 10¹⁰ particles would have a final length (σ_z) of about 0.08 mm with a peak current of 9600 A

[en] This paper describes a beam pulsing system installed on a low energy beam line of the heavy ion accelerator GANIL. The unwanted beam bunches are vertically deflected by a rectangular pulse shaped electric field between two horizontal plates. As an example, this system can eliminate 9 of 10 bunches by pulsing a 2 kV voltage at a maximum repetition rate of 1.4 MHz. A full technical description of the device is given. (orig.)

[en] A modified Beringer-Gluckstern buncher system for injection into a linac is described. Basically, the beam is cut into 360 deg sections and alternate sections are sent through two separate but identical buncher cavities operating at half the linac frequency. (E.C.B.)

No abstract available

[en] Coherent Vavilov-Cherenkov radiation generated by a 6.1MeV bunched electron beam traveling in the vicinity of a solid dielectric target (PTFE and Paraffin) has been investigated experimentally. In addition, we have also demonstrated the simple scheme of the Cerenkov interferometer for non-invasive longitudinal electron bunch length diagnostics.

No abstract available

[en] This invention concerns a compact system of magnetic deflections making it possible to obtain a beam of pulsed accelerated electrons from electron bunches of high density. The system of magnetic deflections covered by this invention can supply bunches of high density by converting the changes in the movement quantity moments of the electrons emitted over time Δt of a pulse, into a variation of the length of the trajectories covered by these electrons (for example, in the case of an electron linear accelerator)

No abstract available

[en] The purpose of the chopper/buncher system for the RTM injector is to chop a 100 keV 5 mA dc electron beam into 60⁰-long pulses at 2380 MHz and then bunch these beam pulses to 10⁰ at insertion into the 5 MeV injector linac. These beam manipulations must contribute a minimum increase in the phase space of the beam such that, at the entrance to the injector linac, the transverse emittance is less than 5π mm-mrad. Phase-shift measurements on the chopped beam indicate that the bunching fields are sufficient to achieve the required longitudinal compression. Beam envelope measurements, using wire scanners on the chopped and bunched beam, show that the emittance remains within design goals

No abstract available