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[en] Over the past 25 years, Fermilab has been involved in cryogenic technology as it relates to pursuing experimentation in high energy physics. The Laboratory has instituted a strong cryogenic safety programme and has maintained a very positive safety record. The solid commitment of management and the cryogenic community to incorporating safety into the system life cycle has led to policies that set requirements and help establish consistency for the purchase and installation of equipment and safety analysis and documentation. (Author)
[en] Latest results from the Tevatron on photon and jet production are presented in this proceedings. The impact of the data is discussed from the point of view of proton parton-density constrains
[en] The author reviews the history and present status of CP violation measurements made during RunII of the Fermilab Tevatron. Both flavor-tagged and untagged measurements of the Cp-violating phase βsJ/#Psi# are discussed, as well as measurements of the width difference ΔΛs between heavy and light Bs0 mass eigenstates made in the Bs0 → J/Ψφ system.
[en] The D0 detector at the Fermilab Tevatron was upgraded for Run II. This upgrade included improvements to the trigger system in order to be able to handle the increased Tevatron luminosity and higher bunch crossing rates compared to Run I. The D0 Run II trigger is a highly exible system to select events to be written to tape from an initial interaction rate of about 2.5 MHz. This is done in a three-tier pipelined, buffered system. The first tier (level 1) processes fast detector pick-off signals in a hardware/firmware based system to reduce the event rate to about 1. 5kHz. The second tier (level 2) uses information from level 1 and forms simple Physics objects to reduce the rate to about 850 Hz. The third tier (level 3) uses full detector readout and event reconstruction on a filter farm to reduce the rate to 20-30 Hz. The D0 trigger menu contains a wide variety of triggers. While the emphasis is on triggering on generic lepton and jet final states, there are also trigger terms for specific final state signatures. In this document we describe the D0 trigger system as it was implemented and is currently operating in Run II
[en] The liquid helium temperature cryogenic system for the Fermilab Tevatron is the largest operating system in the world both from the standpoint of capacity and physical size. This system first brought into operation in 1983 has operated almost continuously for five years. Emphasis has been on achieving reliabilities associated with electrical power systems. During the present Tevatron collider run cryogenic reliability contributed to a maximum duration of 52.6 hrs. for the longest proton-antiproton collision run and efficiency of 82% in achieving the scheduled hours for collisions. Reliability has been accomplished by incorporation of redundancy in critical components and buffering the output of devices so that downstream of a system no impact is observed even when a component has failed. That is the failed component such as a pump can be repaired or replaced prior to any change in the output of that system. Other lessons that will help in future designs will be discussed. A major development is a sector test (1/6 of Tevatron Ring) operated with four cold compressors in order to lower the temperature of the Tevatron in order to increase the maximum energy of the accelerator to 1 TeV. Test results should be available for presentation. (author) 5 figs
[en] This is a report of the commissioning of the TEVATRON Collider and the CDF Detector that has taken place in the period between September 1985 and May 10, 1987. Previously, there was a short test run for the Collider and parts of the Detector in the winter of 1985. In the period of September to December, the TEVATRON was operated at 800 GeV and was commissioned in the collider mode with the Source. In December the CDF Detector was rolled into the collision hall and the period between December and March 1, 1987 was spent in the testing and commissioning of the complete system. The major data-taking part of the run took place between March 1 and May 10
[en] During the last year the Tevatron Collider has been running not only with two new low beta insertions and electrostatic separators to keep the protons and p-bars from colliding anywhere except where desired, but also with a new collimator system. The author reports on this system, including sensitivity of halo evolution to Tevatron operating point
[en] The combined effect of impedance and higher order chromaticity can act on the beam in a nontrivial manner which can cause a tune shift which depends on the relative momenta with respect to the 'on momentum' particle (Δp/p). Experimentally, this tune shift affects the measurement of the linear chromaticity which is traditionally measured with a change of Δp/p. The theory behind this effect will be derived in this paper. Computer simulations and experimental data from the Tevatron will be used to support the theory.