SEPIA - (ALMA Band 5, 7 and 9)
SEPIA is the Swedish-ESO PI receiver for APEX. The receiver shares the backend with FLASH+ receiver, XFFTS, (PI instrument built by MPIfR, Bonn).
The SEPIA Band 5 frequency channel is a dual polarization 2SB receiver built to the specifications of ALMA band 5 with the RF band 159-211 GHz. The receiver is based on the pre-production ALMA Band 5 receiver cartridge, more technical details can be found in .
The receiver has two IF outputs per polarization, USB and LSB, 4-8 GHz, for a total of 16 GHz IF band. The sideband rejection ratio is >10 dB and 18.5 dB average. The single-sideband noise temperature of the Band 5 frequency channel is below 55K at all frequencies within the RF band.
The SEPIA Band 7 band intends to cover the frequency range between 272 and 376 GHz. Installation and commissioning are still pending and are expected for 2018.
The SEPIA Band 9 frequency channel is a dual polarization DSB receiver built to the specifications of ALMA band 9 with the RF band 600-722 GHz. The receiver is based on the pre-production ALMA Band 9 receiver cartridge. See a complete technical description in .
The receiver has one IF output per polarization, 4-12 GHz, but currently only 4-8 GHz IF is recorded by the APEX backend. The double-sideband noise temperature of the Band 9 frequency channel is below 150K at all frequencies within the RF band (see ).
Observing time estimators
 For a technical description of the Band 9 receiver, please see the following publication: Baryshev, A. M.; Hesper, R.; Mena, F. P.; Klapwijk, T. M.; van Kempen, T. A.; Hogerheijde, M. R.; Jackson, B. D.; Adema, J.; Gerlofsma, G. J.; Bekema, M. E.; Barkhof, J.; de Haan-Stijkel, L. H. R.; van den Bemt, M.; Koops, A.; Keizer, K.; Pieters, C.; Koops van het Jagt, J.; Schaeffer, H. H. A.; Zijlstra, T.; Kroug, M.; Lodewijk, C. F. J.; Wielinga, K.; Boland, W.; de Graauw, M. W. M.; van Dishoeck, E. F.; Jager, H.; Wild, W., "The ALMA Band 9 receiver. Design, construction, characterization and first light", Astronomy & Astrophysics, Vol 577, A12 (February 2015).