Workbook

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It should be noted that the open geometry of the E-799 detector, the high
acceptances for multi-body final states, and the high energy of the decaying
kaons, leads to unprecedented sensitivities to numerous rare and not so rare
kaon and neutral pion decays. We produced many new physics results from
the E-799I data.
R&D and preparation for KTeV: E-799II
We will be using the same technique with a substantially improved
detector and new beamline to reach a sensitivity for 4-body decays of 10- 11 . The
most important detector upgrade will be the new pure CsI electromagnetic
calorimeter. The same detector will be used for 21t E'/E studies (E-832). This
program is named 'KTeV' and was approved in February 1992. A
comprehensive design report on the KTeV program was produced in April
1992 outlining the physics goals, the beam, the siting, and the detector in much
detail. This KTeV report also describes the full details of the calorimeter
material tests and thus its justification for various parameters.
The construction of the new experimental hall began in early 1994. We
have decided to use the "digital photomultiplier" for the calorimeter after
many studies and tests with the prototypes. Other major detector elements
include a very hermetic scintillation fiber photon veto, a multi-module
Transition Radiation Detector for independent pion/electron identification, and
a very high speed, high throughput data acquisition system.