Beam Emittance Measurement for PLS-II Linac

TL;DR

This paper reports on the measurement of transverse beam emittance at the PLS-II linac's pre-injector using quadrupole scan, providing essential data for beam transport optimization.

Contribution

It presents the first transverse emittance measurements at 100 MeV in the PLS-II linac using the quadrupole scan technique.

Findings

Horizontal emittance: 0.591 mm-mrad

Vertical emittance: 0.774 mm-mrad

Beam parameters aid in beamline matching

Abstract

The PLS-II has a 100 MeV pre-injector for the 3 GeV Linac. A thermionic gun produces electron charge of 200 pC with a bunch duration of 500 ps by a 250 ps triggering pulser. At the pre-injector, one of the most important beam parameters to identify the beam quality is a transverse emittance of electron bunches. Therefore we measure the beam emittance and twiss functions at 100 MeV in order to match the beam optics to beam transport line and go through it to the storage ring. To get the transverse emittance measurement, well-known technique, quadrupole scan, is used at the pre-injector. The emittance were 0.591 mm-mrad in horizontal and 0.774 mm-mrad in vertical direction.