Table 1
Comparison of optical properties of various Cherenkov radiators. The radiators used in the development of HEPI are highlighted in bold. Data collated from Cohen-Tanugi et al. (2003), Adachi et al. (2008), Tabata et al. (2012), El-Shemy et al. (2022), Yang et al. (2015), Connell et al. (2019), Amaré et al. (2014), Kratochwil et al. (2021).
| Radiator | 1 cc mass (g) | Refractive index @ 300–400 nm | Proton E min (MeV) |
|---|---|---|---|
| Silica aerogel | 0.5 | 1.05 | 2140 |
| MgF 2 | 3.18 | 1.37 | 434 |
| SiO2 | 2.65 | 1.45 | 357 |
| Perspex | 1.18 | 1.50 | 320 |
| Fused silica | 2.2 | 1.50 | 320 |
| Quartz | 2.65 | 1.54 | 295 |
| Sapphire | 3.97 | 1.77 | 199 |
| PbF 2 | 7.7 | 1.89 | 167 |
| Diamond | 3.52 | 2.42 | 92.1 |
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