The Detector: Watson! I think I've found it!

Located 36m from the beam dump, measuring 16 m in length, comprised of 6 state-of-the-art sections, sits the chocolate eclair of the DONUT experiment, the hybrid emulsion spectrometer. DONUT scientists had 2 difficulties to overcome in building a target/detector that had the resolution power to observe the tau neutrino. First, the lifetime of the tau, partner to the tau neutrino, is extremely short; its mean decay length measures only 2.3mm. Secondly, the tau neutrino, as we have mentioned, is extremely non-interacting. So they had to build a detector with very fine resolution and sufficient target density to allow for events to take place. A hybrid emulsion spectrometer (HES) would complete the job nicely, because the dense emulsion would give plenty of targets for the incoming neutrinos and simultaneously record all events, while the spectrometer would provide the necessary data to identify the event products.

To learn more about the components of the HES, click on the different sections of the figure below.

Emulsion Target and Scintillating Fiber Trackers

Trigger Counter System

Drift Chamber Tracking

Electromagnetic Calorimeter

Muon Identification System

Last updated: 6/29/01 comments