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Bunch-by-bunch longitudinal diagnostics is a key issue of modernaccelerators. To face up this challenging demand, tests of mid-IR compactuncooled photoconductive HgCdTe detectors have been recently performed atDAFNE. Different devices were used to monitor the emission of e- bunches. Thefirst experiments allowed recording of 2.7 ns long e- bunches with a FWHM of asingle pulse of about 600 ps. These results address the possibility to improvediagnostics at DAFNE and to this purpose an exit port on a bending magnet ofthe positron ring has been set-up. An HV chamber, hosting a gold-coated planemirror that collects and deflects the radiation through a ZnSe window, is thefront-end of this port. After the window, a simple optical layout in air allowsfocusing IR radiation on different detectors. The instrumentation will allowcomparison in the sub-ns time domain between the two rings and to identify andcharacterize bunch instabilities. Moreover, to improve performances tests ofnew photovoltaic detectors with sub-ns response times are in progress. We willbriefly summarize the actual status of the 3+L experiment and will discussfuture applications of fast IR photovoltaic detectors and the development offast IR array detectors.

Beam diagnostics at DAFNE with fast uncooled IR detectors