arXiv subjects

J. Sutiak

Publications and source records attributed to J. Sutiak.

3 recordsLinked to original sources

arXiv2013

Measurement of the Luminosity in the ZEUS Experiment at HERA II

The luminosity in the ZEUS detector was measured using photons from electron bremsstrahlung. In 2001 the HERA collider was upgraded for operation at higher luminosity. At the same time the luminosity-measuring system of the ZEUS experiment was modified to tackle the expected higher photon rate and synchrotron radiation. The existing lead-scintillator calorimeter was equipped with radiation hard scintillator tiles and shielded against synchrotron radiation. In addition, a magnetic spectrometer was installed to measure the luminosity independently using photons converted in the beam-pipe exit window. The redundancy provided a reliable and robust luminosity determination with a systematic uncertainty of 1.7%. The experimental setup, the techniques used for luminosity determination and the estimate of the systematic uncertainty are reported.

physics.ins-det↗

arXiv2005

The Spectrometer System for Measuring ZEUS Luminosity at HERA

The upgrade of the HERA accelerator has provided much increased collider luminosity. In turn, the improvements have necessitated a new design for the ZEUS luminosity measurements. The intense synchrotron radiation field, as well as the high probability of a bremsstrahlung photon in each bunch crossing, posed new experimental constraints. In this report, we describe how these challenges were met with the ZEUS luminosity spectrometer system. The design, testing and commissioning of the device are described, and the results from the initial operational experience are reported.

physics.ins-det↗

arXiv2004

A Detector for Forward Physics at eRHIC: Feasibility Study

The eRHIC facility planned for the Brookhaven National Laboratory will allow detailed studies of the strong hadronic interactions. Among the exciting research topics discussed are the pursuit of the Color Glass Condensate, the three dimensional scan of nucleons and nuclei, and the solution to the mystery of how the proton spin is built up from its constituents. This document describes a detector optimized for forward physics at such an accelerator. The experience gained at HERA allows for the design of a detector which will give optimal performance in the kinematic regions of highest priority, the small and large $x$ regimes. Detailed simulations of the detector were carried out, and performance results for structure function measurements are presented.

hep-ex↗