A New High Energy Photon Tagger for the H1 - Detector at HERA

TL;DR

The paper describes the upgrade of the H1 detector at HERA with a new electromagnetic calorimeter that enhances detection of high-energy photon events, improving the study of gamma-proton interactions.

Contribution

Introduction of a new electromagnetic calorimeter near the H1 detector that extends acceptance for high y photoproduction events, enabling better analysis of high energy gamma-p processes.

Findings

Calorimeter successfully installed and operational during 1996-1999.

Extended acceptance for photoproduction events to y range 0.85-0.95.

First results demonstrate improved detection capabilities.

Abstract

The H1 detector at HERA has been upgraded by the addition of a new electromagnetic calorimeter. This is installed in the HERA tunnel close to the electron beam line at a position 8m from the interaction point in the electron beam direction. The new calorimeter extends the acceptance for tagged photoproduction events to the high y range, 0.85 < y < 0.95, and thus significantly improves the capability of H1 to study high energy gamma-p processes. The calorimeter design, performance and first results obtained during the 1996-1999 HERA running are described.