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Introduction

The Collider Experiment at Fermilab (CDF) is probing the highest energy regime in particle collisions. The top quark, discovered in 1995 by two experiments (CDF and D0) at Fermilab, is the heaviest elementary object known to mankind. Although top quarks were extremely abundant in the early Universe just a few moments after the Big Bang, they are now very rare. In fact they are produced only in high energy cosmic ray collisions or in the high energy collisions taking place at Fermilab between protons and antiprotons in the Tevatron.

In the past data sample collected at Fermilab between 1992 and 1995, we have found 43 events that are consistent with top production in 50 million events that were recorded on magnetic tape by the CDF experiment. A new upgrade of the Tevatron (Run II) will yield a data sample 150 times larger of top quarks. The new data sample will give us excellent prospects for a diverse physics program. This could lead to the discovery of the Higgs boson that is expected to be the key to understanding the origin of mass and the discovery of new particles. It can also allow the precise study of b-quarks and the origin of matter and anti-matter asymmetry in the universe.

A key element to this physics program is the precise measurement of charged particle position. The CDF experiment has installed in 2001 a 8 square meter silicon detector, the largest silicon system ever operated. The Purdue group (Bortoletto and GarfinkelO has worked for eight years toward the completion of this detector. The silicon detector for CDF will have about 1 million electronic channels. The first layer is located between a radius of 1.35 cm and 1.62 cm from the beam line. The longest part of the silicon system covers a length of almost 2 m.

Purdue has played a crucial role in the development and characterization of the silicon sensors. Over the last 9 years we have put in place a forefront research center for silicon sensor R&D. This laboratory was the primary research center for the development and testing of the silicon sensors for the SVX II. Six graduate students and over ten undergraduate students have participated in this effort. Members of our research team (G. Bolla and Juan Pablo Fendandez) had a key role in the commissioning of this detector.

Purdue ( Barnes) is also responsible for the primary calibration of the Endplug Upgrade EM and Hadron Calorimeters, using radioactive sources to transfer calibrations from small testbeam modules to the main detector.