Single electron beams from the LEP pre-injector

Abstract

At the request of the L3 collaboration (one of the LEP experiments) a new facility was built close to the Electron Positron Accumulator (EPA) to provide a single electron per beam pulse at an energy which can be selected between 180 MeV and 500 MeV. The intensity of the e3ected electron beam is reduced by changing the gun parameters and by adxusting the aperture of the slits in the linac. The energy is defined by letting the beam do 1 1/4 turn in the EPA. The enery spread is limited to 0 . 5 l o -' by reducing the slits aperture in the LILlEPA transfer line. A new transfer line was built to transport the beam from the EPA ejection septum to the detector test stand. The facility was then used to test the response of the L3 electromagnetic calorimeter corrposed of Bismuth-Germanium-Oxide (BGO) crystals in the 100 MeV range.

Study of low multiplicity electron source LEETECH with diamond detector

“…[4]. For the commissioning and calibration of LEP calorimeter a source of a few electrons in a single bunch was built based on the LEP pre-injector [5]. The ELBE facility in Germany, by using a different approach, in which the scattering of electron bunch occurs in the middle of the two accelerating sections, demonstrated the test beams of single electrons of energies up to 40 MeV [6].…”