The hadron calorimeter prototype beam-test results

Here We present here the beam-test results obtained with the HCAL Prototype exposed on the X7 beam line of the CERN SPS accelerator. The iron plate: - scintillator tile sampling calorimeter has been tested in the bearn momenta range 10 = 80 GeV/c. The measured energy, angular and coordinate dependences of the HCAL responce and resolution were found to be corresponding to the LHCb design requirements. The angular and X-Y coordinate uniformity have been checked and compared with stand-alone Monte-Carlo simulation program predictions. The radioactive source calibration procedure has been developed. The LED pulse system allows to monitor the short-term stability of the detector. New 40 MHz front-end electronics have been tested and compared with ordinary charge integrating ADC's. The results of the first combined calorimeter tests are also presented. The signal shapes have been studied for FICA L., instrumented with different fiber types and were found to satisfy the I,IICb performance requirements

The hadron calorimeter prototype design and construction

This paper describes the design concept of the LHCb Hadron Calorimeter Prototype and it's construction experience. In total 6 modules with different internal structure have been assembled and tested on the X7 SPS beam-line during last three years. Various optics components, PMT's and digitizing electronics have been tested with the HCAL prototype. A calibration system with radiactive source and pulsing LED have been checked and accepted for further implementation. Several computer controlled sub-systems were developed to make the beam-test measurements precise and reliable. The constructed prototype showed a good performance and lead to the final design of the LHCb HCAL detector