Darmstadt 2008 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 37: Instrumentation und Anwendungen I
HK 37.3: Talk
Thursday, March 13, 2008, 17:15–17:30, 2C
Measurement of transverse emittance at the source of spin-polarized electrons at the S-DALINAC* — •Christian Eckardt1, Wolfgang Ackermann2, Roman Barday1, Uwe Bonnes1, Ralf Eichhorn1, Joachim Enders1, Christoph Hessler1, Wolfgang F.O. Müller2, Oleksandr Patalakha1, Markus Platz1, Yuliya Poltoratska1, Wolfgang Rick1, Bastian Steiner2, and Thomas Weiland2 — 1Institut für Kernphysik, TU Darmstadt — 2Institut für Theorie Elektromagnetischer Felder, TU Darmstadt
A new injector concept for 100 keV spin-polarized electrons (SPIN) at the S-DALINAC has been developed. The transverse emittance was measured for beam characterization. The emittance is a quantity concerning the quality of the beam, describing the phase space area. Determination of the emittance requires measurement of the beam profile and knowledge of the focal length of a beam focussing device.
A wire scanner unit consisting of two 50 µm diameter tungsten wires is used for the beam-profile measurement. Data analysis is performed by fitting a gaussian model distribution to estimate the 1σ beam radius. Each determined beam width is correlated to the corresponding focal length of a magnetic lens, and a parabola fit is applied to calculate the parameters of the σ-matrix. The square root of the determinant of the σ-matrix defines the emittance. The results of the calculation are presented and the emittance is compared to theoretical estimates.
*Supported by DFG through SFB 634.