- E3 lower band tuning checked (260GHz). It was possible to tune it, but changing the harmonic mixer bias was needed. The Trx obtained were ~60-65K at LI band. Note that since this band was connected to synthesizer 2, the difficulty in tuning the line was not related with the problem of synthesizer 1 referred below. (3.5. GQ)
The upper band edge of E3 still needs to be tested. All other band edges can be reached as announced in the call for proposal:
- E0: 78-117,
- E1: 130-174,
- E2: 201-267,
- E3: 260-?
Ripples and spurious signals
to be written
System Stability
to be written
Science verification
- The following figure shows a spectrum of Orion IRc2 covering 32GHz of the 3mm window. It was taken with WILMA in wobbler switched mode in two EMIR setups in 30minutes of on+off observing time. Each EMIR setup used 16GHz simultaneously, both sidebands, with one polarisation. One broken WILMA unit was later repaired. The 4MHz/8GHz Filterbank was used in parallel, but data are not shown here.
- A long 4 hour integration of the Cloverleaf, a quasar at high redshift, in the 3mm window, resulted in flat baselines with 0.4mK at 150km/s resolution. For this, we used WILMA in wobbler switching mode. The redshifted CO 3-2 line is confirmed.
Next steps
- The 1MHz filterbank is not yet available
- HERA needs to be tested before being available again
- Polarimetry will be commissioned later
- Band 4 will be fully commissioned later and is in general not available this summer semester.
A PaKo manual is in preparation. PaKo online help on new EMIR features is already available.