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The Precise Alignment of the Fermilab KTeV Experiment V Bocean S Childress R Coleman R Ford D Jensen Fermi National Accelerator Laboratory Batavia USA ABSTRACT The two new neutral kaon CP violation experiments currently running at Fermilab collectively known as KTeV use a common beam and detection system The need for accurate primary beam targeting and precise neutral beam definition have led to stringent alignment tolerances The alignment must insure that a 0 25 mm size primary beam hits the target and is stable to better than 0 1 mm that the target collimator system which forms the secondary neutral beams be positioned at the 0 25 mm level and the two resulting beams have equal size and momentum spectra Results so far indicate that all expectations have been met The primary beam hit the target on the first pulse Preliminary off line analysis shows the target collimator system was aligned to better than 0 25 mm horizontally and 0 5 mm vertically and that stability was within 0 1 mm for periods of months This paper gives an overview of the methods the implementation and the results of the precise alignment of the KTeV experiment We also discuss stability issues and the current status of the experiment s alignment monitoring system 1 INTRODUCTION Using two carefully matched neutral kaon beams KTeV is currently making very high precision physics measurements addressing the origins of CP violation and is doing very sensitive searches for rare and forbidden kaon decays Precision alignment plays a fundamental role in the success of the KTeV physics program by contributing to the reduction of possible systematic errors below the sensitivity noise level 1 1 Experiment overview Design parameters KTeV currently consists of two experiments E799 II and E832 E799 II is a search and or study of neutral kaon and hyperon rare decays E832 is a high accuracy measurement of at the10 4 level The secondary beams are two neutral horizontally separated square beams In E832 a regenerator



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