Table 1.
Originally modelled, measured, and required performance parameters of the M-HWPA across the two NIKA bands.
| MHWPA – NIKA | ||||||
|---|---|---|---|---|---|---|
| 2 mm (150 GHz) | 1.25 mm (240 GHz) | |||||
| Model | Tests | Req. | Model | Tests | Req. | |
| TC | 0.968 | 0.943 | No | 0.958 | 0.934 | ≥0.90 |
| TL | 0.907 | 0.901 | No | 0.958 | 0.954 | ≥0.90 |
| ΔTCL | 0.059 | 0.042 | No | 0.000 | 0.020 | No |
| X-pol | −15.5dB | −12.6dB | No | −17.4dB | −16.5dB | ≤−15dB |
| ΔΦCL | 198 ± 20 | 207 ± 30 | No | 178 ± 70 | 190 ± 60 | 180 ± 200 |
Notes. The parameters are: the axes transmissions TC and TL; the differential transmission ΔTCL; the cross-polarisation X-pol; and the differential phase-shift between the axes ΔΦCL. The values are averaged and weighted using the NIKA band profiles. The background colours indicate: non-ideal performance (red); acceptable (yellow); and good performance (green). We note that this waveplate was designed to work only in the NIKA 1-mm band.
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