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D0 Silicon Upgrade: VLPC Prototype Cryostat Custom J1 VME Backplane Specification

D0 Silicon Upgrade: VLPC Prototype Cryostat Custom J1 VME Backplane Specification

Date: September 16, 1996
Creator: Baert, Mark & /Fermilab
Description: The general physical layout is: (1) There are a total of 9 slots, designated 1 through 9, from left to right; (2) Each slot is associated with a 96 pin Class 2 DIN 41612 (VME type) connector; (3) All even numbered slots are right handed (Connectors to the right of the card)., as would be found on a normal VME J1 backplane, these slots utilize standard DIN connectors; (4) All odd numbered slots are left handed. These slots utilize standard 96 pin Class 2 DIN 41612 connectors orientated with 180 degrees of rotation. Thus, the connector's Al position is associated with the lower right pad of the backplane for that particular connector. Likewise, the connector's C32 position is associated with the upper left pad of the backplane for that particular connector; (5) 5 layers (comp, gnd, pwr, gnd, sold); (6) .125-inch thick; and (7) Mechanical layout presented in drawing number 3823.113-MD-330044. Electrical characteristics are: (1) The backplane is routed as though it were a standard 9 slot VME J1 backplane, with 11 as the mater slot, as dermed in ANSI/IEEE 1014-1987 standard; (2) The presence of odd slots has no effect on backplane routing. At each and every slot, Al ...
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D0 Silicon Upgrade: Wedge Heat Transfer

D0 Silicon Upgrade: Wedge Heat Transfer

Date: September 19, 1994
Creator: Ratzmann, Paul
Description: The Silicon Mechanical group has submitted a wedge drawing to the Fermilab Analysis Group (Zhijing Tang) to determine the temperature distribution in the ladder during detector operation. Heat transfer by convection and radiation is assumed negligible and two dimensional FEA conduction solutions were performed. The heat flux at the SVX II chip region is assumed to be 8.359 mW/mm{sup 2} which corresponds to roughly 0.48 W per SVX II chip. The heat flux in the region of the transceiver is assumed 5.556 mW/mm{sup 2}, corresponding to 2.56 W in this region. Total heat load of the wedge is assumed to be 10.24 W. The wedge submitted for analysis is shown. The multi-chip module (MCM) is mounted on a beryllium plate which serves to carry the heat load of the chips and the transceiver to the cooling channel. Adhesive thermal conductivity is 1.6 W/m-K, based on the published value of the selected adhesive. Actual measurements of thermally conductive adhesives indicate that the assumed 1.6 W/m-K is high. Experience gained in measuring adhesive thermal conductivity indicates 0.9-1.2 W/m-K as a more reasonable number to use. The effect of the uncertainty of the adhesive thermal conductivity on silicon temperature is discussed.
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D0 Silicon Upgrade: West End Assembly Hall Platform Design Calculations

D0 Silicon Upgrade: West End Assembly Hall Platform Design Calculations

Date: January 3, 1996
Creator: Rucinski, Russ & /Fermilab
Description: This engineering note documents design calculations done for the bayonet feed can platform installed at the far west end of the assembly hall. The platform is mounted off of a cast concrete wall directly south of where the shielding block wall is stacked. A summary of the loading, reaction forces and stresses is shown on the page 3. As can be seen, the calculated stresses are very small, maximum value = 2540 psi. The material used is structural steel tubing, ASTM A500 Gr. B, with a minimum yield strength of 46 ksi and minimum ultimate tensile strength of 58 ksi. The reaction forces for the upper two members will be carried together by a 1/2-inch mounting plate. The mounting plate is attached to the wall by four 1/2-inch Hilti wedge anchors. The allowables for each wedge anchor are 2400 lbs. tensile, 1960 lbs. shear. The major reaction load for the top members is a combined 3627 lbs. tensile load which can easily be handled by the four bolt pattern. Some small moment reactions not listed on the summary page add negligible (400 lbs.) force couples to the axial loading. The bottom members are also attached to a mounting plate that ...
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D0 Solenoid Chimney Routing Clearances

D0 Solenoid Chimney Routing Clearances

Date: February 23, 1994
Creator: Rucinski, R. & /Fermilab
Description: This engineering note contains information about the measured clearances along the chimney route from the solenoid to the control dewar. This type of information is best conveyed by sketches and a few photos. Twelve photos taken on 2/17/94 are included which gIVe perspective views along the path. The detector was parked in the collision hall on this date. The CF iron was split open to the east and the South EF iron was rolled back. Also the South EndCap Calorimeter was rolled to the south on this day. This allowed personnel access and the photographic opportunity. A full set of raw dimensional sketches are included. These sketches were generated by me using a 25 foot tape measure and a note pad. The sketches are in chronological order with the most recent on top. The first sketch, 5/18/94, describes the 'tightest' location for the upward incline portion of the chimney. The sketches on 2/14/94 thru 2/16/94 are refinements of the early 1992 and 1993 sketches. They pick out quite a bit more detail of specific detector components along the path. The dimensional sketches of 1992 and 1993 gave information in not as much detail and therefore gave a more constrained clearance ...
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D0 Solenoid Commissioning September 1998

D0 Solenoid Commissioning September 1998

Date: October 12, 1998
Creator: Rucinski, R. & /Fermilab
Description: D-Zero installed a new 2 Tesla superconducting solenoid magnet into the central tracking region of the D-Zero detector. This report documents the cryogenic performance of the superconducting solenoid during its first cryogenic operation at Fermilab. By necessity, the liquid helium refrigerator was also operated. This was the second time the refrigerator plant has been operated. The refrigerator's performance is also documented herein.
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The D0 solenoid NMR magnetometer

The D0 solenoid NMR magnetometer

Date: November 20, 2002
Creator: Sten Uldall Hansen Terry Kiper, Tom Regan, John Lofgren et al.
Description: A field monitoring system for the 2 Tesla Solenoid of the D0 detector is described. It is comprised of a very small NMR probe cabled to a DSP based signal processing board. The design magnetic field range is from 1.0 to 2.2 Tesla, corresponding to an RF frequency range of 42.57 to 93.67 MHz. The desired an accuracy is one part in 10{sup 5}. To minimize material in the interaction region of the D0 detector, the overall thickness of the NMR probe is 4 mm, including its mounting plate, and its width is 10 mm. To minimize cable mass, 4mm diameter IMR-100A cables are used for transmitting the RF signals from a nearby patch panel 25 meters to each of four probes mounted within the bore of the solenoid. RG213U cables 45 meters long are used to send the RF from the movable counting house to the patch panel. With this setup, the detector signal voltage at the moving counting room is in the range of 250-400 mV.
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D0 Solenoid Upgrade Project: Chimney LN2 Radiation Shield Attachment Area Calculation

D0 Solenoid Upgrade Project: Chimney LN2 Radiation Shield Attachment Area Calculation

Date: May 26, 1993
Creator: Rucinski, R. & /Fermilab
Description: A short calculation was done to check the attachment method of the radiation shield to it's LN2 cooling tubes. The case considered was only for the obround chimney section. The proposed attachment method was to use 1/8-inch plug welds spaced every 5-inch along the length of the shield. The calculations were done conservatively for 6-inch spacing between plug welds. The criteria used was that the LN2 shield warmest temperature be less than 2 K above the temperature of the LN2 fluid. Using a very conservative heat transfer model. the calculations predict that the warmest temperature on the radiation shield will be < 1.4 K warmer than the LN2 fluid temperature.
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D0 Solenoid Upgrade Project: D0 Solenoid Current Leads

D0 Solenoid Upgrade Project: D0 Solenoid Current Leads

Date: October 4, 1993
Creator: Rucinski, R. & /Fermilab
Description: This engineering note documents information gathered and design decisions made regarding the vapor cooled current leads for the D-Zero Solenoid. The decision was made during design group meetings that the D-Zero Solenoid, rated at 4825 amps, should use vapor cooled current leads rated at 6000 amps. CDF uses 6000 amp leads from American Magnetics Inc. (AMI) and has two spares in their storage lockers. Because of the spares situation and AMI's reputation, AMI would be the natural choice of vendor. The manufacturer's listed helium consumption is 19.2 liters/hr. From experience with these types of leads, more stable operation is acheived at an increased gas flow. See attached E-Mail message from RLS. We have decided to list the design flow rate at 28.8 liquid liters/hr in the design report. This corresponds to COFs operating point. A question was raised regarding how long the current leads could last at full current should the vapor cooling flow was stopped. This issue was discussed with Scott Smith from AMI. We do not feel that there is a problem for this failure scenario.
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D0 Solenoid Upgrade Project: Heat Load Calculations for the Solenoid Chimney

D0 Solenoid Upgrade Project: Heat Load Calculations for the Solenoid Chimney

Date: May 26, 1993
Creator: Rucinski, R. & /Fermilab
Description: This engineering note documents the calculations done to determine the chimney heat loads. These heat load numbers were reported in the D0 solenoid upgrade design report. The heat loads to the LN2 circuit were done by Andrew Stefanik, RDIMechanical Systems group. They were part of his LN2 shield calculations dated 2/23/93. Pages 1 thru 3 of his calculations that apply to the chimney are attached. The heat loads to the LHe circuit were done originally on 12/16/92 and then revised on 12/23/92 to be more conservative. The raw calculations are attached. I include both the original 12/16 version and the 12/23 revised version to document the amount of conservativeness added.
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D0 Solenoid Upgrade Project: Pressure Ratings for Some Chimney and Control Dewar Componenets

D0 Solenoid Upgrade Project: Pressure Ratings for Some Chimney and Control Dewar Componenets

Date: May 25, 1993
Creator: Rucinski, R. & /Fermilab
Description: Pressure rating calculations were done for some of the chimney and control dewar components. This engineering note documents these calculations. The table below summarizes the components looked at, and what pressure rating are. The raw engineering calculations for each of the components is given.
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D0 Solenoid Upgrade Project: Rectangular Liquid Helium Tube, Miscellaneous Information

D0 Solenoid Upgrade Project: Rectangular Liquid Helium Tube, Miscellaneous Information

Date: May 26, 1993
Creator: Rucinski, R. & /Fermilab
Description: This engineering note contains miscellaneous information about the rectangular liquid helium supply tube for the D-Zero solenoid. The information is fairly superficial, but could be used as a starting point for a future engineer who is going to specify and puchase the tubing. The chimney contains 4 conductors attached to an aluminum liquid helium supply tube. Because good thermal contact is desired, the tube will have flat sides. Aluminum is chosen to match the thermal contraction coefficient of the superconductor's aluminum stabilizer. The type of aluminum is chosen as 6061-T6 because it's allowable stress in ANSI/ASME B31.3 is higher than for other alloys. A different alloy could be chosen for extrusion reasons. The highest pressures this tubing should see will be during a quench. Current calculations predict the peak pressure during a quench to be 520 psi a for one-way relieving and 250 psia for two way relieving. Whatever the final alloy selection, the tubing needs to have a high enough allowable working pressure. There is very little room in the obround section of the chimney. In that portion the shape is rectangular, 12.7 mm (0.50-inch) x 31.8 mm (1.25-inch). A drawing shows the flow path cross section. This also ...
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D0 Solenoid Upgrade Project: Solenoid Insulatiing Vacuum Vessels; Relief Path Capacity Calculation

D0 Solenoid Upgrade Project: Solenoid Insulatiing Vacuum Vessels; Relief Path Capacity Calculation

Date: May 26, 1993
Creator: Rucinski, R.; Bell, D. & /Fermilab
Description: This engineering note documents the calculations done to determine the relief capacity of the solenoid vacuum pumping line. The calculations were done by David Bell, a co-op student from the University of Wisconsin. The calculations are attached. The conclusion is that the vacuum pumping line has a venting capacity of 129 g/s warm helium or 298 g/s warm nitrogen. Both of these capacities are much larger than the expected operating mass flow rates of the liquid helium (5 to 15 g/s) or liquid nitrogen (2 or 3 g/s) circuits. The calculations assume the solenoid vacuum vessel is at 3 psig and the relief plate is set at 1.5 psig. Additional calculations were done to prove that the venting capacity of the vacuum pumping line exceeded flowrates due to a failure mode. These calculations are attached. Since the system is not finalized, (pipe sizes not determined, components sized...) the calculations were done by first picking reasonable line sizes based on known allowed pressure drops in the system and then doing a maximum delivery rate calculation if a line was completely severed in the vacuum space of the solenoid/control dewar. The numbers from these calculations say that failure mode flow rates are ...
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D0 Solenoid Upgrade Project: Thermal Contraction Analysis for the D0 Solenoid Chimney

D0 Solenoid Upgrade Project: Thermal Contraction Analysis for the D0 Solenoid Chimney

Date: September 30, 1993
Creator: Rucinski, R. & /Fermilab
Description: This engineering note documents the thermal contraction analysis that was done for the D-Zero solenoid chimney. The analysis was done as support of the 'Design Report of the 2 Tesla Superconducting Solenoid for the Fermilab DO Detector upgrade.' The cryogenic LHE and LN2 lines were analyzed for combined pressure, thermal movement, and dead weight. The tubing was stress analyzed per ASME code for Pressure Piping, standard ANSI AS:ME B31.3, for eight combinations ofthermal loading. A commercial pipe stress analysis and design system by Algor{reg_sign} was used for the analysis. Stresses calculated were well below allowables. Based on the analysis, the cryogenic lines will be installed at an offset from the vacuum jacket centerline so that during steady state cold operation, the cryogenic lines will be in a proper location.
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D0 Solenoid Upgrade Project: Vacuum Pumping Calculations for the D0 Solenoid

D0 Solenoid Upgrade Project: Vacuum Pumping Calculations for the D0 Solenoid

Date: August 2, 1993
Creator: Rucinski, R. & /Fermilab
Description: This engineering note documents the calculations done to determine the vacuum pumping speed for the D-Zero solenoid. The raw calculations are attached. A summary of the results are listed. The vacuum pumping speed of the solenoid is determined by the conductance of the pumping path. At higher pressure ranges during initial pumpdown, the conductances will be rather high. Calculations were not done for the transient pumpdown period, only the steady state type pumping situation. The pressure is assumed to be on the order of 10E-7 torr. This is the free molecular flow regime based on Knudsen number. This pressure regime is also where the pumping speed would be least. The conductances were calculated based on pumping helium gas at a temperature of 300 Kelvin. The total conductance of the pumping path from the solenoid to the inlet of the turbomolecular pump is 11.8 L/s. The effective pumping speed of a 1000 L/s turbo pump attached to this pumping path is 11.7 L/s. The minimum required pumping speed for design purposes was set at 4.3 L/s. This value was arrived at by assuming a warm leak size (10E-8 atm-cc/sec) was not detected during fabrication of the solenoid. It is then assumed ...
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D0 status and first results from Run II

D0 status and first results from Run II

Date: January 12, 2004
Creator: Juste, Aurelio
Description: In order to fully exploit the physics potential of the Tevatron Run 2, the D0 detector has been upgraded. Having nearly completed the commissioning phase, the D0 detector is starting to produce its first physics results. An overview of the status of the main subdetectors involved in the upgrade is given, followed by some examples of preliminary physics results already emerging.
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D0 Superconducting Solenoid Quench Data and Slow Dump Data Acquisition

D0 Superconducting Solenoid Quench Data and Slow Dump Data Acquisition

Date: June 9, 1998
Creator: Markley, D. & /Fermilab
Description: This Dzero Engineering note describes the method for which the 2 Tesla Superconducting Solenoid Fast Dump and Slow Dump data are accumulated, tracked and stored. The 2 Tesla Solenoid has eleven data points that need to be tracked and then stored when a fast dump or a slow dump occur. The TI555(Texas Instruments) PLC(Programmable Logic Controller) which controls the DC power circuit that powers the Solenoid, also has access to all the voltage taps and other equipment in the circuit. The TI555 constantly logs these eleven points in a rotating memory buffer. When either a fast dump(dump switch opens) or a slow dump (power supply turns off) occurs, the TI555 organizes the respective data and will down load the data to a file on DO-CCRS2. This data in this file is moved over ethernet and is stored in a CSV (comma separated format) file which can easily be examined by Microsoft Excel or any other spreadsheet. The 2 Tesla solenoid control system also locks in first fault information. The TI555 decodes the first fault and passes it along to the program collecting the data and storing it on DO-CCRS2. This first fault information is then part of the file.
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D0 SUSY/BSM searches

D0 SUSY/BSM searches

Date: December 1, 2008
Creator: Muanza, Steve & /Marseille, CPPM
Description: We report on D0 searches for supersymmetry (SUSY) at the TEVATRON Run II. Analyses with data samples in the following range of integrated luminosities 1 < {integral} Ldt < 2.1 fb{sup -1} are summarized. These searches look for different production processes and decay channels in gravity and gauge mediated SUSY breaking models. No excess of observed events is found with respect to the Standard Model (SM) predictions, therefore a series of exclusion limits at the 95% confidence level (C.L.) are drawn.
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D0 top analyses: Recent results on the properties of the sixth quark

D0 top analyses: Recent results on the properties of the sixth quark

Date: June 1, 1996
Creator: Hall, R. E.
Description: The D0 collaboration updates measurements of the Standard Model top quark in pp collisions at {radical}s = 1.8 TeV at the Fermilab Tevatron, with a new data sample of approximately twice the integrated luminosity used for the discovery measurements ({approximately}100 pb{sup -1}). We observe 37 t{bar t} candidate events from seven decay modes with an expected background of 13.4 {+-} 3.0 events. We present a preliminary new top mass measurement of 170 {+-} 15 (stat.) {+-}10 (syst.) GeV/c{sup 2} using the single-lepton + jets decay modes. For the central value of our measured mass we calculate the production cross section to be 5.2 {+-} 1.8 pb. D{O} is also analyzing additional decay modes and we report preliminary results from two new channels.
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D0 top physics

D0 top physics

Date: November 1, 2005
Creator: Pleier, M.-A. & U., /Rochester
Description: The Tevatron proton-antiproton collider at Fermilab operates at a center of mass energy of 1.96 TeV and is currently the only source for the production of top quarks. Recent D0 results on the top quark's production cross section and its properties such as mass, helicity of the W in its decay and branching fraction B(t {yields} Wb) are presented, and probe the validity of the Standard Model (SM).
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D0 top quark cross section for the 1992--1995 tevatron run

D0 top quark cross section for the 1992--1995 tevatron run

Date: October 1, 1996
Creator: Bantly, J. & Collaboration, D0
Description: We present a measurement of the t{bar t} cross section in p{bar p} collisions at {radical}s = 1.8 TeV using dilepton and single lepton final states. This analysis uses about 100 pb{sup -1} of data collected with the D0 detector at Fermilab during the 1992-1995 run. Analyses in two other final states are also presented. 13 refs., 3 figs., 2 tabs.
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The D0 Upgrade

The D0 Upgrade

Date: July 1, 1995
Creator: Abachi, S. & Collaboration, D0
Description: In this paper we describe the approved DO Upgrade detector, and its physics capabilities. The DO Upgrade is under construction and will run during the next Fermilab collider running period in early 1999 (Run II). The upgrade is designed to work at the higher luminosities and shorter bunch spacings expected during this run. The major elements of t he upgrade are: a new tracking system with a silicon tracker, scintillating fiber tracker, a 2T solenoid, and a central preshower detector; new calorimeter electronics; new muon trigger and tracking detectors with new muon system electronics; a forward preshower detector; new trigger electronics and DAQ improvements to handle the higher rates.
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D0 Vent Stacks

D0 Vent Stacks

Date: January 22, 1988
Creator: Fuerst, J.D. & /Fermilab
Description: There are two nitrogen/argon exhaust headers in the D0 cryogenic piping system, one for the liquid argon dewar and another for the three argon calorimeters. These headers serve two functions, venting both nitrogen exhaust from the cooling loops and cold argon gas should any argon vessel blow a relief. These headers are vacuum jacketed until they exit the building. At that point, uninsulated exhaust stacks direct the flow into the atmosphere. This note deals with the these stacks.
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DA - Base Input

DA - Base Input

Date: January 4, 2006
Creator: unknown
Description: Contains base input from Defense Finance and Accounting Office, CO
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DA - Base Summary Sheet - Defense Agencies - Defense Finance and Accoutning Rock Island - IL

DA - Base Summary Sheet - Defense Agencies - Defense Finance and Accoutning Rock Island - IL

Date: August 6, 2005
Creator: United States. Defense Base Closure and Realignment Commission.
Description: DFAS provides professional, responsive finance and accounting services to DoD and other federal agencies.
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