Objective
The H1 detector at HERA has made significant contributions to the understanding of proton and photon structure by studying electron proton interactions at a centre of mass energy of about 310 GeV. Further progress is now limited partially by deficiencies in the H1 apparatus which this project addresses. Adding the proposed calorimeter to the H1 detector would enable the identification of events in which a photon carrying a large proportion of the electron's energy is involved. This would be possible at the trigger level, ensuring that large samples of such events may be collected and studied. These events form a significant background in the study of proton structure and hence a better understanding of them would lead to a more accurate determination of that structure. The identification of such events would allow the measurement of the inclusive photon proton cross section at unprecedented centre of mass energies. Studies of many exclusive processes at the highest photon proton centre of mass yet achieved would be possible. One such study, requiring the identification of jets in the hadronic final state, would be the examination of the structure of the photon. This will be possible in the region in which the partons in the photon carry very little of the photon's energy, equivalent to the low Bjorken x region for the proton which HERA has shown to be of such interest. The additional information on the luminosity obtainable using the Etag8 will enhance all cross section measurements made by H1.
The main research activities that will be performed as part of this project are: the measurement of the radiation levels at the site proposed for the detector; the study of various possible detector designs and the testing of the radiation hardness of the materials involved; the manufacture, testing and calibration of the detector; the design and construction of a beam pipe which allows the escape of the electrons to be detected by the Etag8 through a minimum of material; the installation of the beam pipe and Etag8 and the surveying thereof; the design and production of the electronics necessary for the operation and readout of the Etag8; the incorporation of the Etag8 in the H1 trigger system; the production of the software for data acquisition, simulation of the detector and reconstruction of the data; the extraction of a measure of the luminosity from the data and the study of the physics topics mentioned above with the data obtained using the Etag8.
The results of the project will be reported at regular project meetings and also to the H1 collaboration. Studies connected with the development of the hard and software of the Etag8 will be described at international conferences on instrumentation in High Energy Physics. The results of studies of the structure of the photon and the proton will be the subject of papers in the High Energy Physics literature and will be discussed at the relevant international meetings.
Topic(s)
Call for proposal
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L69 7ZE LIVERPOOL
United Kingdom