This report concerns a detection module used for a pellet tracking system. Spheres of frozen hydrogen known as pellets can be used as internal targets in hadron physics experiments. Pellets are created some distance above the accelerator beam and directed in a pellet beam pipe to intersect the accelerator beam. To determine the position of a pellet in the interaction region in the case of an interaction, the pellets need to be tracked. This is done using tracking sections along the pellet beam pipe with measurement levels containing lasers illuminating the pellets and cameras, detecting the light. The pellet position in the interaction region can be reconstructed with an accuracy of 0.1 mm. To reach this accuracy there are high demands on the alignment of the cameras and lasers. Alignment by a pellet beam pipe is generally difficult so a solution enabling alignment elsewhere is desired. Therefore a detection module consisting of a plate with cameras and lasers mounted to it has been constructed. These cameras and lasers can be aligned in an alignment bench setup before being transported to a pellet beam pipe. The alignment of the cameras and lasers on the detection module must be maintained under certain conditions e.g. transportation, temperature changes, exposure to vibrations. This report covers investigations regarding the mechanical stability of the detection module under these conditions. Different alignment bench targets are investigated. The effects of the optics of the cameras and lasers and the functionality of the detection module are investigated.

I detta kandidatarbete genomförs en rigorös analys av tidigare experiment och behandlar effekterna av laserpulser på droppformeringen vid UPTS (Uppsala Pellet Test Station). Analysen består av att undersöka olika data som registrerats av både LineScan- och CCD-kameror och identifiera korrelationer mellan olika parametrar, samt utforska hur de påverkar droppformeringen och droppkvalitén. De varierande parametrarna var höjden på både STR-lasern och CCD-kameran, fördröjningen mellan laserpulserna och vibrationerna hos munstycket, pulslängden och intensiteten hos lasern. De identifierade korrelationerna var mellan olika pulslängder och viktade x-positionen, x-bredden, tidslinjerna mellan pelleterna och pelletstrålens 2D-profil. Dessutom hittades en korrelation mellan fördröjningen och den viktade x-positionen för pelleterna. För de andra parametrarna var det svårt att bekräfta korrelationer på grund av det stokastiska beteendet hos pelleterna.