EXPERIMENTAL TEST OF THE ADAPTIVE ALIGNMENT OF THE MAGNETIC ELEMENTS OF LINEAR COLLIDER

The first results of the experiment on the beam-based adaptive alignment of the magnetic elements of linear colliders are given in this report. This experiment has been realized on the Stanford Linear Collider at SLAC (USA) at the FFTB facility and showed the good convergence and stability of the method. It can be applied to compensate as any sharp or fluent technical displacement of quads as the seismic vibrations of the ground. The main idea of the method One of the greatest challenges to the development of TeV-scale e+e – linear colliders is to make particle beams with extremely small sizes up to few tens nanometers. Producing and colliding tightly focused beams requires careful control, precise alignment and stabilization of magnetic elements. The demands to precision of alignment could be from few microns till to some nanometers. However, seismic movement of the ground, technical noise and many other reasons leads to destruction of the alignment and makes our efforts to do alignment one time forever absolutely useless. Therefore, the alignment should be only adaptive, which operates simultaneously with the operating of the accelerator. The proposed algorithm of adaptive alignment [1] is an iterative process and consists of following steps. Each quad has the beam position monitor (BPM). To shift the certain lens the method requires BPM's data from this quad and two neighboring ones (i.e. algorithm is local). Then suggested shifts for each quad can be calculated by following formula: ()∆X B