SRC IHEP facilities 
 Plastic scintillators
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The research and development programm of plastic scintillators begane in IHEP at 70-th years.

The works were concentreted in the folowwing directions:

I the production of polystirene scintillators using the process of styrene polymerization in blocks;
II the extrusion of bulk-polymerized scintillators from blocks;
III the production of molded scintillators by the injection molded technique.

Scintillators manufactured by methods I, II were tested and actively used in domestic experiments at IHEP as well as some experiments abroad.

With the help of method III - the injection molded technique, large volumes of scintillators for several experiments at the IHEP (~3 tons) and for hadron calorimeters Hcal 1 and Hcal 2 of experiment in COMPASS (CERN) (~2 tons) was manufactured in IHEP.



However, in the past mass production of scintillators was limited due to technological restrictions on our old equipment. During the last decade the demand on moulded scintillators for various projects (PHENIX, HERA-B, LHC, LHC-b) have inceased up to several tens of tons per year.

Our old molding equipment did not allow IHEP to take obligations on manufacturing such large volumes of scintillators. Growing demand on plastic from various experiments such as PHENIX (16 tons) and ATLAS led to evasion of potential orders on plastic from IHEP to different companies.

Based on the above-mentioned circumstances, the management of IHEP purchased an additional equipment for the production of plastic scintillators and sorting out raw material.

This led to a significant increment in plastic scintillator production up to ~100 tons per year. The exact amount of produced plastic scintillators depends on specified features and parameters of the order.

Thus, the estimated time for these production of 15 tons of scintillators (more that 750.000 plates) for the KOPIO experiment could be 1.5 years.

Similar plastic scintillators for the CKM experiment of FNAL, where there is a demand; for 11 tons in 25.000 plates, could be manufactured in 3-4 months.


Along with the moulding technique, the IHEP group intends to expand its manufacturing facilities to extruded plastic scintillators.

The extrusion technology will allow us to produce flat plates of scintillators up to 12 meters long (with width of 650 mm and thickness of 2 to 10 mm). This extrusion line was installed the first quarter of 2002. Such extrusion line allows us to produce of more than 100 tons of plastic scintillators per year.

The flexibility of this equipment will be improved and allow us to produce flat plates(strips) of plastic scintillators with specified cross-section (analogous to the ones used in the MINOS and OPERA experiments).

IHEP's experts are currently working on the creation of new plastic scintillators. These research investigations go in the following directions:

the creation of plastic scintillators with higher light yields and shorter decay times;
the creation of plastic scintillators with a possibility of effective detection of thermal neutrons;
plastic scintillators with high levels of radiation hardness;
composete scintillators for precise calorimetry;
the creation of high efficiency reflecting coatings for plastic scintillators.