by the actual background levels encountered in the experiment which are unknown at this time. IV. Running Time and Other Requests As indicated in the Spectrometer Layout, Fig. 11.1, p607 will require that the magnetic elements of the existing CO spectrometer be repositioned. We will not change spectrometer angles during P607 so that the spectrometer elements can be set dir~ct1y on the floor. The experimenters will supply the detector and its small vacuum chamber. We expect to supply and maintain the gas jet and the remainder of the spectrometer system such as. vac. parts, lqd. He, and the assembly to pulse the A1 foil in and out of the spectrometer ape'rture. We anticipate that it will take approximately 3 months for us to build and debug the apparatus and require approximately 4 weeks (~ 400 hours) of accelerator time to complete the experiment. We -8­ estimate that it will require approximately one week to reconfigure the spectrometer and one week to install the detectors. A modest amount of PREP electronics and off-line computing will also be required. Our present best estimate is that we will be able to begin taking data for this experiment in April 1979. Until April 1979 our major effort will be the analysis of E439. -9­ Reference