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in subjects: "Velocity Experiment-Hep"

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ECN Pressure Test

This note describes: the rationale for the test pressure of the inner ECN cryostat vessel, the equipment to be used in this test, the test procedure, the status of the vessel prior to the test, the actual test results, and a schematic diagram of the testing set up and the pressure testing permit. The test, performed in the evening of July 17, 1991, was a major success. Based on a neglible pressure drop indicated on the pressure gages (1/4 psi), the vessel appeared to be structurally sound throu… more

Date: July 18, 1991

Creator: Dixon, K.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

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

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 as… more

Date: August 2, 1993

Creator: Rucinski, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

Liquid Argon Maximm Convective Heat Flux vs. Liquid Depth

In order to help answer questions about the magnitude of heat flux to the liquid argon in a liquid argon calorimeter which could cause boiling (bubbles), calculations estimating the heat flux which can be removed by free convection were made in February, 1988. These calculations are intended to be an estimate of the heat flux above which boiling would occur. No formal writeup was made of these calculations, although the graph dated 3 Feb 88 and revised (adding low-velocity forced convection lin… more

Date: January 12, 1990

Creator: Peterson, T.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

D-Zero Vacuum System

The system pumping speed was calculated by taking the reciprocal of the sum of the reciprocal pump speed and the reciprocal line conductances. The conductances of the pipe were calculated from the following formulas taken from the Varian vacuum manual. This report updates the original to reflect the pumping curves and basic vacuum system characteristics for the purchased components and installed piping of the D-Zero vacuum system. The system consists of two Edward's E2M275 two stage mechanical … more

Date: April 7, 1986

Creator: Wintercorn, S.J.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

D-0 South End Cap Calorimeter Cold Test Results

The South endcap calorimeter vessel was moved into Lab A on Sept. 18, 1990. A cooldown of the pressure vessel with liquid nitrogen was performed on Sept. 26 to check the vessel's integrity. With the pressure vessel cold, the insulating vacuum was monitored for leaks. Through out the testing, the insulating vacuum remained good and the vessel passed the test. The cold test was carried out per the procedures of D-Zero engineering note 3740.220-EN-250. The test was very similar to the cold test pe… more

Date: November 26, 1990

Creator: Rucinski, R.

Item Type: Report

Partner: UNT Libraries Government Documents Department

open access

The status of the CMS experiment

The CMS experiment was completely assembled in the fall of 2008 after a decade of design, construction and installation. During the last two years, cosmic ray data were taken on a regular basis. These data have enabled CMS to align the detector components, both spatially and temporally. Initial use of muons has also established the relative alignment of the CMS tracking and muon systems. In addition, the CMS calorimetry has been crosschecked with test beam data, thus providing an initial energy… more

Date: January 1, 2009

Creator: Green, Dan

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Measurement of the Lambda_b Lifetime in Lambda_b -> Lambda_c+ pi- Decays in p-pbar Collisions at sqrt(s) = 1.96 TeV

We report a measurement of the lifetime of the {Lambda}{sub b}{sup 0} baryon in decays to the {Lambda}{sub c}{sup +} {pi}{sup -} final state in a sample corresponding to 1.1 fb{sup -1} collected in p{bar p} collisions at {radical}s = 1.96 TeV by the CDF II detector at the Tevatron collider. Using a sample of about 3000 fully reconstructed {Lambda}{sub b}{sup 0} events we measure {tau}({Lambda}{sub b}{sup 0}) = 1.401 {+-} 0.046 (stat) {+-} 0.035 (syst) ps (corresponding to c{tau}({Lambda}{sub b}… more

Date: December 1, 2009

Creator: Aaltonen, T.; Adelman, J.; Alvarez Gonzalez, B.; Amerio, S.; Amidei, D.; Anastassov, A. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Search for Charged Massive Long-Lived Particles Using the D0 Detector

A search for charged massive stable particles has been performed with the D0 detector using 1.1 fb{sup -1} of data. The speed of the particle has been calculated based on the time-of-flight and position information in the muon system. The present research is limited to direct pair-production of the charged massive long-lived particles. We do not consider CMSPs that result from the cascade decays of heavier particles. In this analysis, the exact values of the model parameters of the entire super… more

Date: May 1, 2009

Creator: Xie, Yunhe & U., /Brown

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

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MINOS results, progress and future prospects

The MINOS long baseline experiment has been collecting neutrino beam data since March 2005 and has accumulated 3 x 10{sup 20} protons-on-target (POT) to date. MINOS uses Fermilab's NuMI neutrino beam which is measured by two steel-scintillator tracking calorimeters, one at Fermilab and the other 735 km downstream, in northern Minnesota. By observing the oscillatory structure in the neutrino energy spectrum, MINOS can precisely measure the neutrino oscillation parameters in the atmospheric secto… more

Date: May 1, 2007

Creator: Raufer, Tobias M.

Item Type: Article

Partner: UNT Libraries Government Documents Department

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Proposal to upgrade the MIPP experiment

The upgraded MIPP physics results are needed for the support of NuMI projects, atmospheric cosmic ray and neutrino programs worldwide and will permit a systematic study of non-perturbative QCD interactions. The MIPP TPC is the largest contributor to the MIPP event size by far. Its readout system and electronics were designed in the 1990's and limit it to a readout rate of 60 Hz in simple events and {approx} 20 Hz in complicated events. With the readout chips designed for the ALICE collaboration… more

Date: September 1, 2006

Creator: Isenhower, D.; Sadler, M.; Towell, R.; Watson, S.; Peterson, R. J.; Baker, W. et al.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Measurement of neutrino velocity with the MINOS detectors and NuMI neutrino beam

The velocity of a {approx}3 GeV neutrino beam is measured by comparing detection times at the Near and Far detectors of the MINOS experiment, separated by 734 km. A total of 473 Far Detector neutrino events was used to measure (v -c)/c = 5.1{+-}2.9x10{sup -5} (at 68% C.L.). By correlating the measured energies of 258 charged-current neutrino events to their arrival times at the Far Detector, a limit is imposed on the neutrino mass of m{sub v} < 50 MeV/c{sup 2} (99% C.L.).

Date: June 1, 2007

Item Type: Article

Partner: UNT Libraries Government Documents Department

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OCH Button Test

A test was conducted to make a check on the yield stress of the copper spacer buttons to be used in OCH. The tested button was made from Copper no. 110, cold drawn rod, which has a documented yield stress value of 48,000 psi. The button was put into compression with the load applied to the face of the button. The resulting deflection vs. the applied cross load was then charted with the width of the chart having a 10,000 kg scale. While the chart speed was set at 1 cm/min, the cross head speed w… more

Date: May 1, 1987

Creator: Kurita, C. H.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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A Search for Charged Massive Stable Particles at D0

A search for charged massive stable particles has been performed with the D0 detector at the Fermilab Tevatron. The signature is two particles reconstructed as muons, but with speed and invariant mass inconsistent with beam-produced muons. No excess of events is observed and limits are set on the production cross-section for pair-produced stable stau sleptons based on 390 pb{sup -1} of data. Limits vary from 0.06 pb to 0.62 pb, depending on the stau mass, and are the strictest Tevatron limits t… more

Date: August 1, 2005

Creator: Eads, Michael T.

Item Type: Thesis or Dissertation

Partner: UNT Libraries Government Documents Department

open access

CC Cryostat Vacuum Pumping Efficiency

This report calculates the effect of the conductances of the pumping lines on the pumping speeds of the vacuum pumps being used to pump the inner vessel, and annular space, vacuum tight during the CC Cryostat testing. Effective pumping speeds were calculated for various values of pressure via the above stated formulas (see calculations). Conductances of valves, elbows, and tees were calculated with the help of ref. 1, and the volumes of the inner vessel and annular space were calculated wtth th… more

Date: October 13, 1987

Creator: Fitzpatrick, J.B.

Item Type: Report

Partner: UNT Libraries Government Documents Department

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Report Tunneling Cost Reduction Study prepared for Fermilab

Fermi National Accelerator Laboratories has a need to review the costs of constructing the very long tunnels which would be required for housing the equipment for the proposed Very Large Hadron Collider (VLHC) project. Current tunneling costs are high, and the identification of potential means of significantly reducing them, and thereby helping to keep overall project costs within an acceptable budget, has assumed great importance. Fermilab has contracted with The Robbins Company to provide an … more

Date: July 16, 1999

Item Type: Report

Partner: UNT Libraries Government Documents Department

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D-0 North End Cap Calorimeter Cold Test Results

The North endcap calorimeter vessel was recieved on July 1, 1990. A cooldown of the pressure vessel with liquid nitrogen was performed on July 10-11 to check the vessel's integrity. With the pressure vessel cold, the insulating vacuum was monitored for leaks. Through out the testing, the insulating vacuum remained good and the vessel passed the test. The cold test was carried out per the procedures of D-Zero engineering note 3740.220-EN-250. The test was very similar to the cold test performed … more

Date: August 2, 1990

Creator: Michael, J.

Item Type: Report

Partner: UNT Libraries Government Documents Department