CERN Accelerating science

Article
Title	Wire Scanners in the Undulator Section of the VUV-FEL DESY
Author(s)	Sachwitz, M ; Grabosch, H J ; Thom, H
Affiliation	(DESY Zeuthen, Zeuthen DESY, Hamburg)
Publication	2005
In:	7th European Workshop on Beam Diagnostics and Instrumentation for Particle Accelerators, Lyons, France, 6 - 8 Jun 2005, pp.203
Subject category	Accelerators and Storage Rings
Abstract	Seven wire scanner stations are implemented in the undulator section of the TTF II accelerator. Vertical and horizontal scans provide vertical resp. horizontal measurements of the beam profile and beam position with um resolution. Absolute position determination in the range of 50 um are achieved by an external reference system. Read out electronics resolve a beam intensity independent beam position signal for a single-bunch data acquision. The wire scanner set up detects the secondary particles which are created when the wire passes the electron beam with constant velocity (0 to 1 m/sec). Results of test measurements at the Photoinjector Zeuthen and first measurements at TTF II are represented.