Tevatron Extraction Modeling

A comparison is made between measured and predicted transverse beam profiles in the Fermilab Swilchyard. In the vertical plane a prosaic but operationally important issue is ex- amined; for the case of consecutive splits using electrostatic septa, how does multiple scattering from the first septa affect the distribution from a highly asymmetric downstream split, In the horizontal plane the input distribution for the Switch- yard is detenmined by the extraction process; and the particular case of increasing the step size across the extraction septa is examined. In prepamtion for the increase in intensity from the forth- coming upgrades at Fermilab and for the expected changes in momentum {(both higher and lower) for the fixed target pro- gram, a series of modelings of the extraction from the Teva- tron tbroughl the Fermilab Switchyard has been undertaken. The Switchyard is a set of splitting stations with attendant bending and focusing elements which delivers beams of vary- ing intensity to different external experimental areas. The splitting stalions consist of thin wire electrostatic septa fol- lowed by magnetic septa (Lambertsons). At the present stage of development the Tevatron Extrac- tion Modeling Program ,TEVEXT (I), and Transporflurtle (21 have been compared at AO, the beginning of the extraction channel leading into the Switchyard. In the future a TEVJXT file will be used as input for Turtle now that this consistency checking has beal perfolmed.