Abstract
An electromagnetic (EM) calorimeter constructed from high-pressure gas-ionization tubes with sinusoid-like longitudinal profile (wiggler tubes) has been assembled, and tested in an electron beam at the CERN SPS. This design greatly improves the EM energy resolution compared to a calorimeter constructed from straight tubes and eliminates the resolution dependence on the beam angle. An EM energy resolution of δ E/ E (32.0 ± 1.6)% / √ E ⊕ (2.9 ± 0.3)% has been achieved. Further improvements of the EM energy resolution are discussed. The calorimeter is very radiation hard, has a fast response, and it is stable and mechanically robust; it is intended for the forward region of the LHC collider detectors.
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