First Results of the High Resolution Wire Scanners for Beam Profile and absolute Beam Position Measurement at the TESLA Test Facility at DESY

(MO-3-26)

U. Hahn, M. Meschkat, F. Ridout, G. Schmidt, K. Wittenburg  

DESY, Hamburg

In the TESLA Test Facility wire scanners are used to measure the electron beam profile and position. Especially the intended use of the wire scanners to centre the electron beam in the VUV FEL undulator [1] needs a precise alignment of the wire scanners in respect to the undulator axis and a high resolution measurements. The wire scanners should define a reference axis in respect to an external reference system of the undulator with an accuracy better than 15 micro meter [2]. The wire scanners allow also a beam profile measurement which will be used to optimise and match the beam optics for the undulator.

First experimental results of beam position and profile will be presented and discussed.

[1] A VUV Free Electron Laser at the TESLA Test Facility at DESY. Conceptual Design Report. DESY Print TESLA-FEL 95-03

[2] Concept of electron beam diagnostic for the VUV SASE FEL at the Tesla Test Facility at DESY, U. Hahn, J. Pfl$\ddot{u}$ger, G. Schmidt, Proceedings of the 20th international FEL conference