BRAND EVN AND EVN) (BRoad-bAND Joint Research Activity in RadioNet4 Gino Tuccari & Walter Alef plus partners
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1 BRAND EVN (BRoad-b AND EVN) (BRoad-bAND Joint Research Activity in RadioNet4 Gino Tuccari & Walter Alef plus partners
2 digital VLBI-receiver: ~ GHz for the EVN and other telescopes Prototype for prime focus + research for secondary focus
3 Background: EVN Observing Bands Today in the EVN separate receivers cover: 18 cm - L band 13 cm - S band 6 cm - C band 5 cm - C (Methanol-OH) 4 cm X band (21 cm; 1.3 cm; 7mm only globals; 50 cm) In each EVN session ~3 freqs. observed in succession No multi-band simultaneous observations
4 New technical Opportunities Broad-band LNAs and feeds e.g. VGOS, DIVA 1.5 GHz GHz backends with very high data rates see JRA DIVA: DBBC3 with 2x 4GHz dual pol - 32Gbps soon up to 128 Gbps High bit-rate recorders: Mark 6 (64 Gbps w. 4 Flexbuff can develop multi-wavelength VLBI now!
5 Scientific motivation fast frequency switching VLBA offers fast frequency switching (~7 s) between 2 or 3 frequencies high user demand saves valuable observing time spectral index maps if phase-referencing is used: precise registration of source positions precise measurement of core-shift is wanted for the EVN for more than 15 y!
6 Scientific motivation - multiwavelength VLBI simultaneous multi-frequency observations - a la VGOS with fringe-fitting over very wide frequency range (cf. VGOS) will determine ionosphere
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8 Scientific motivation - multiwavelength VLBI simultaneous multi-frequency observations - a la VGOS with fringe-fitting over very wide frequency range (cf. VGOS) will determine ionosphere (RN4 JRA-RINGS) precise registration of simultaneous images at different frequencies But superior to VGOS due to continuous freq. coverage (RFI filters!!)
9 Scientific motivation - multiwavelength VLBI (cont) superior to fast switching! UV-coverage vastly improved due to wide frequency band multi-frequency imaging software available Compatible with VGOS joint observations Antenna positions & ICRF
10 Scientific motivation (cont.) Spectroscopy of several different maser types in different frequency bands simultaneously Variations of polarised emission as a function of frequency over a very wide frequency range Single dish: flux variation studies (many bands) rotation measures over large bandwidths pulsar observations over a wide frequency range
11 BROAD BAND GHz PROPOSAL Single cooled receiver covering the broad-band for astronomy with linear polarization feed Starting from e.g. the ten years VGOS developed technology (feeds, backends, recorders) New: Analogue signal processing without any frequency conversion and huge sky frequency range + extremely high bit-rate
12 BROAD BAND GHz PROPOSAL Survey of individual EVN antennas! Feed options (prime/secondary), RFI, interfaces will select prime focus as demonstrator research on options for secondary focus solutions aim is to install the BRAND receiver in the whole EVN
13 BROAD BAND GHz PROPOSAL (feed) Prime focus: QRFH feed from Onsala (e.g. JRA DIVA) DYQSA feed from Yebes ELEVEN feed from Onsala Scondary focus (only study) Ninja feed (Japan)
14 BROAD BAND GHz PROPOSAL (analogue) Cryogenic HTS (High Temperature Superconductor) filters for strong RFI Wide-band LNA (e.g. Yebes) Analogue signal processing: only LNA and amplification chain
15 BROAD BAND GHz PROPOSAL (digital, firmware) Fully digital broad-band sampling and data processing next version of DBBC3 with: sampling 0 GHz GHz output data-rate up to 128 Gbps Broad-band digital receiver together with frontend but also universal back-end for VGOS, other receivers Fully digital down-conversion and/or band selection: DSC/PFB/DDC Output channel selection means also selection of the observing band => MULTI-BAND SIMULTANEOUS OBSERVATIONS!
16 BROAD BAND GHz PROPOSAL (firmware) Digital polarization conversion from linear to circular Additional digital RFI mitigation - Local RFI fingerprint determination at stations Multi-band total power detector Multi-band polarimeter - (and spectrometer...)
17 Advantages for EVN User: new improved science more observing time Telescopes fewer receivers to maintain more observing time EVN could take lead in VLBI observing with novel capabilities
18 PARTNERS MPI INAF OSO YEBES ASTRON VIRAC (no cost)
BRAND EVN (BRoad-bAND EVN) Joint Research Activity in RadioNet4 Gino Tuccari & Walter Alef plus partners
BRAND EVN (BRoad-bAND EVN) Joint Research Activity in RadioNet4 Gino Tuccari & Walter Alef plus partners digital VLBI-receiver: ~1.5-15.5 GHz for the EVN and other telescopes Prototype for prime focus
BRAND EVN EVN) Joint Research Activity in RadioNet4 Gino Tuccari & Walter Alef plus partners
BRAND EVN (BRoad-bAND EVN) Joint Research Activity in RadioNet4 Gino Tuccari & Walter Alef plus partners EVN Observing Bands < 22GHz Today in the EVN separate receivers cover: 18 cm - L band 13 cm - S
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