Candidates to replace R-12 as a radiator gas in Cherenkov detectors
Dichlorodifluoromethane (R-12) has been widely used as a radiator gas in pressure threshold Cherenkov detectors for high-energy particle physics. However, that compound is becoming unavailable due to the Montreal Protocol. To find a replacement with suitably high refractive index, we use a combinati...
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| Veröffentlicht in: | Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms Beam interactions with materials and atoms, 2018-06, Vol.425, p.38-42 |
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| container_title | Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms |
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| creator | Harvey, Allan H. Paulechka, Eugene Egan, Patrick F. |
| description | Dichlorodifluoromethane (R-12) has been widely used as a radiator gas in pressure threshold Cherenkov detectors for high-energy particle physics. However, that compound is becoming unavailable due to the Montreal Protocol. To find a replacement with suitably high refractive index, we use a combination of theory and experiment to examine the polarizability and refractivity of several non-ozone-depleting compounds. Our measurements show that the fourth-generation refrigerants R-1234yf (2,3,3,3-tetrafluoropropene) and R-1234ze(E) (trans-1,3,3,3-tetrafluoropropene) have sufficient refractivity to replace R-12 in this application. If the slight flammability of these compounds is a problem, two nonflammable alternatives are R-218 (octafluoropropane), which has a high Global Warming Potential, and R-13I1 (trifluoroiodomethane), which has low Ozone Depletion Potential and Global Warming Potential but may not be sufficiently inert. |
| doi_str_mv | 10.1016/j.nimb.2018.04.006 |
| format | Article |
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| ispartof | Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 2018-06, Vol.425, p.38-42 |
| issn | 0168-583X 1872-9584 |
| language | eng |
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| source | ScienceDirect Journals (5 years ago - present) |
| subjects | Cherenkov detector F-compounds Halocarbons Refractive index |
| title | Candidates to replace R-12 as a radiator gas in Cherenkov detectors |
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