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SEPIA - (ALMA Band 5 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 [1].

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 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 [2].

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 [2]).

Observing time estimators

[1] Publications resulting from using the data obtained with the Band 5 receiver shall refer to the following publication: Billade, B., Nystrom, O. ; Meledin, D. ; Sundin, E. ; Lapkin, I. ; Fredrixon, M. ; Desmaris, V. ; Rashid, H. ; Strandberg, M. ; Ferm, S.-E. ; Pavolotsky, A. ; Belitsky, V., "Performance of the First ALMA Band 5 Production Cartridge", IEEE Trans. Terahertz Science and Technology, Vol. 2, No. 2, March 2012, pp.208-214.

[2] 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).