[en] The mass of the W vector boson has been measured from an analysis of W→ μ ν decays in the CDF detector at the Fermilab Tevatron bar pp collider. The mass is 79.90 ± 0.53(stat.) ± 0.31(sys.) ± 0.16(scale) GeV/c². When this result is combined with previous CDF measurements, sin²θ_w is determined to be 0.231 ± 0.008. These measurements place an upper bound on the mass of the unfound top quark

[en] As part of the US-LHC collaboration, Fermilab has built and tested seventeen high gradient quadrupole magnets, assembled into nine cryostats, for installation at the Large Hadron Collider Interaction Regions. Most of these magnets have only quarter coil voltage taps for quench characterization, but the magnetic measurement warm bore is instrumented with a quench antenna for localization and characterization. We report on studies using the quench antenna for pre-production prototype (with extensive voltage taps) and 17 production magnets. These include a summary of quench localization and development characteristics, as well as general features of flux changes observed during training ramps

[en] The central drift tube (CDT) array is one of the charged particle tracking systems for the Collider Detector at Fermilab (CDF). The CDT array, which operates in the limited streamer mode, provides high-accuracy r-φ-z information at a radius of 1.4 m for tracking charged particles produced in the central region (pseudorapidity range -1 < η < 1) of √s = 1.8 TeV anti pp collisions. Tracking of charged particles in the r-z view of the CDT array is accomplished via charge division along the anode wires; drift-time measurements in three layers of the CDT array provide tracking information in the r-φ view. A novel design enabling rigid and precise mechanical support of 2016 3 m long, 12.7 mm diameter ultra-thin walled stainless steel drift tubes has been implemented for the CDF central drift tube array. Details of the mechanical design and fabrication of the CDF central drift tube array are described. Some preliminary performance results of the operation of the CDT array obtained from √s = 1.8 TeV anti pp collisions are also discussed. (orig.)

[en] To perform detailed studies of the dynamic effects in superconducting accelerator magnets, a fast continuous harmonics measurement system based on the application of a digital signal processor (DSP) has been built at Fermilab. Using this new system, the dynamic effects in the sextupole field, such as the field decay during the dwell at injection and the rapid subsequent ''snapback'' during the first few seconds of the energy ramp, are evaluated for more than ten Tevatron dipoles from the spare pool. The results confirm the previously observed fast drift in the first several seconds of the sextupole decay and provide additional information on a scaling law for predicting snapback duration. The information presented here can be used for an optimization of the Tevatron and for future LHC operations

[en] We have developed a sensitive computer-controlled method for measuring the anode wire tensions of individual drift tubes which have a wire support located mid-length along the tube. By resonating the anode wire at higher harmonics of the fundamental resonance frequency, simultaneous measurement of the anode wire tension and verification of the location of the wire support was achieved. The anode wire tension for each drift tube was measured to better than 0.5% accuracy and the location of the anode wire support measured to better than 0.01% for drift tubes 3 m in length. This method was used for measuring the wire tensions of 2226 drift tubes during the fabrication of the CDF central drift tube array. (orig.)

[en] A prototype 2-Tesla superconducting transmission line magnet for future hadron colliders was designed, built and tested at Fermilab. The 1.5 m long, combined-function gradient-dipole magnet has a vertical pole aperture of 20 mm. To measure the magnetic field quality in such a small magnet aperture, a specialized rotating coil of 15.2 mm diameter, 0.69 m long was fabricated. Using this probe, a program of magnetic field quality measurements was successfully performed. Results of the measurements are presented and discussed

[en] A systematic study of the persistent current decay and snapback effect in the fields of Tevatron accelerator dipoles was performed at the Fermilab Magnet Test Facility (MTF). The decay and snapback were measured under a range of conditions including variations of the current ramp parameters and magnet operational history. The study has mostly focused on the dynamic behavior of the normal sextupole component. In addition, the paper presents the persistent current effects observed in the other allowed field harmonics as well. The results provide new information about the previously observed ''excess'' decay during the first several seconds of the sextupole decay during injection and the correlation between the snapback amplitude and its duration

[en] Fermilab, as part of the US-LHC Accelerator Project, is producing superconducting low-beta quadrupole magnets for the Large Hadron Collider (LHC). These 5.5 m long magnets are designed to operate in superfluid helium at 1.9 K with a nominal gradient of 205 T/m in the 70 mm bore. Two quadrupoles separated by a dipole orbit corrector in a single cryogenic assembly comprise the Q2 optical elements of the final focus triplets in the LHC interaction regions. The field quality of the quadrupoles is measured at room temperature during construction of the cold masses as well as during cold testing of the cryogenic assembly. We summarize data from the series measurements of the magnets and discuss various topics of interest

[en] A new package of six corrector elements has been designed to better control the beam position, tune, and chromaticity in the Fermilab Booster synchrotron. It incorporates both normal and skew orientations of dipole, quadrupole, and sextupole magnets. These new corrector magnets will be installed in the Fermilab Booster ring in place of old style corrector elements. A severe space restriction and rapid slew rate have posed special challenges. The magnet design, construction, and performance are presented

[en] A method for measurement of rapidly changing magnetic fields has been developed and applied to the testing of new room temperature corrector packages designed for the Fermilab Booster Synchrotron. The method is based on fast digitization of a slowly rotating tangential coil probe, with analysis combining the measured coil voltages across a set of successive magnet current cycles. This paper presents results on the field quality measured for the normal and skew dipole, quadrupole, and sextupole elements in several of these corrector packages