Modular design of long narrow scintillating cells for ILC detector Page: 2 of 13
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The challenging goal of the future international electron-positron linear collider detector is to get about 30%/JE jet
energy resolution, or better. Nowadays, an energy flow algorithm is the most promising way; however, it demands
highly granulated sampling hadron calorimeter. Because of large cost, a digital approach is under investigation for
use in hadron calorimetry. The electronics for a digital hadron calorimeter should be less expensive than for an analog
one. The active medium can be gas [1, 2] or solid, for example, small scintillation cells  or scintillator strip . For
millions of cells, the small area of the active element creates assembly issues, dead zones and edge effects that
significantly reduce the efficiency of registration (smaller the area, longer the perimeter and, consequently, larger the
We have tested a long narrow scintillating element with effective area about 20 cm2 using optical readout via
wavelength (WLS) shifting fibers and miniaturized photo detectors. A set of those elements can be combined with
another layer perpendicular to its orientation, thereby creating the space resolution of about 1 cm2 or better. Such
elements, flexible in length and width, combine naturally in a set of 10 or more, drastically reducing the amount of
dead zones and edge effects, and providing space for the small-sized photodetectors that are insensitive to strong
magnetic field, like MRS (Metal/Resistor/Semiconductor) photodiode [5, 6], and on-board electronics assembly
similar to , which may include amplifiers, discriminators, logic units, etc. In this way, usage of clear fiber can be
avoided completely, WLS fibers are used in the minimum amount, and fiber routing problems are avoided. In the
future, scintillating elements can be produced by extrusion process . This note reports on the first promising
indication for the similar cells performens with machining grooves that were tested using 90Sr radioactive source by
measuring current and rate.
II. GENERAL DESIGN CONSIDERATIONS
The main idea behind the work done is to create a module-based self-triggering and self-sufficient detector part
with an area resolution of about 1 cm2 or less, flexible in length and width, that already consists of several cells,
fibers, photodetectors and necessary on-board electronics. The ideas tested in this paper are: creation of the cell-like
elements and their possible optical separation within solid scintillator piece using grooves, use of miniature solid-state
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Beznosko, D.; Blazey, G.; Dyshkant, A.; Maloney, J.; Rykalin, V.; U., /Northern Illinois et al. Modular design of long narrow scintillating cells for ILC detector, article, September 1, 2005; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc873734/m1/2/: accessed March 23, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.