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LumiCal serves for the precise measurement of the luminosity and improves the detector hermeticity as well. Detailed simulations have been and are being performed
to optimize their design. The most important results of MC studies are presented.
Design of the mechanical structure of LumiCal is presented including discussion on space for front end electronics, fan out on Kapton foil, cooling requirements and necessary stiffness of construction. Thermal expansion of LumiCal structure is also discussed.
To achieve the required accuracy in luminosity measurement, the position of silicon sensors have to be known with micrometer accuracy with respect to the beam and Interaction Point. The inner acceptance radius of LumiCal must be known with the accuracy of 4 µm and we have proved in lab, that our capacitive method of distance to the beam pipe measurement reaches the desired accuracy. Laser beam system for x, y detector displacement has been successfully tested in lab with the accuracy in the submicron range at short distances. The proposed method based on Freq. Scanning Interferometry for distance between two LumiCal’s is presented and foreseen to have accuracy better than 50 µm over ~4 m.
The proposed scheme for front end and readout electronics based on ASIC’s is presented. The switched gain of preamplifiers allows us to work in calibration and physics mode. Results of first custom made ASIC’s, including pipelined ADC’s are also presented.
Prototype silicon sensors have been developed for LumiCal and results of performance tests are presented. Sensors are prepared for LumiCal prototype to be tested on the test beams.
The integration of LumiCal with future ILD detector is discussed mainly focused on fixing the structure inside detector, opening of the detector scenario, cooling issues and space for cables and positioning system.