Speaker
Dr
Viacheslav Kulikov
(NRC “Kurchatov Institute” − ITEP)
Description
Large electromagnetic calorimeter (ECal) is now under construction for multipurpose detector (MPD) of the NICA project at JINR, Dubna to study a phase transition to QGP. ECal is placed in a cylindrical volume with an internal (external) diameter of 3.45(4.6) m and a length of 6 m. It is assembled from 38400 ”shashlik”- type towers containing 210 alternating layers of 0.3 mm lead and of 1.5 mm plastic scintillator, pierced by 16 WLS fibers to collect light on a 6x6 mm2 silicon photomultiplier. At first, the towers are made as 4x4x41.5 cm3 boxes, which are later machined to truncated trapezoids of 64 types to densely fill the cylindrical volume and ensure that all axes of the towers are directed to the intersection point of the collider beams. Since a total weight of ECal towers is 60 tons, a power frame of almost 10 tones in weight has been designed on the basis of modern technology using carbon fibers. The power frame has added a passive material between and in front of the towers. The ECal simulation program was developed by the ITEP group using MpdRoot and FairSoft environment. Details of the program, which describe complicated geometries of both the calorimeter itself and the power frame, are discussed as well as an influence of the passive materials on the ECal performance. This work was supported by RFBR grant No. 18-02-40054.
Primary author
Dr
Viacheslav Kulikov
(NRC “Kurchatov Institute” − ITEP)
