10 Matching Results

Search Results

Advanced search parameters have been applied.

in creator/contributor: "Haberichter, W."

open access

Wire chamber degradation at the Argonne ZGS

Experience with multiwire proportional chambers at high rates at the Argonne Zero Gradient Synchrotron is described. A buildup of silicon on the sense wires was observed where the beam passed through the chamber. Analysis of the chamber gas indicated that the density of silicon was probably less than 10 ppM.

Date: January 1, 1986

Creator: Haberichter, W. & Spinka, H.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Rad-hard electronics study for SSC detectors

The radiation environment in a SSC detector operating at a luminosity of 10{sup 33} cm{sup {minus}2}s{sup {minus}1} will put stringent requirements on radiation hardness of the electronics. Over the expected 10 year life-time of a large detector, ionizing radiation doses of up to 20 MRad and neutron fluences of 10{sup 16} neutrons/cm{sup 2} are projected. At a luminosity of 10{sup 34} cm{sup {minus}2}s{sup {minus}1} even higher total doses are expected. the effect of this environment have been … more

Date: January 1, 1991

Creator: Ekenberg, T.; Dawson, J.; Stevens, A. & Haberichter, W.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Trigger processor for the APEX experiment at Argonne

An electron-positron spectrometer is being constructed at Argonne to search for correlated pairs emitted after heavy ion collisions. The trigger for this experiment requires the detection of a positron in either arm of the spectrometer. We describe the trigger for the experiment which selects events with positron annihilation radiation detected in an array of NaI crystals. 1 ref., 3 figs.

Date: January 1, 1990

Creator: Dawson, J.W.; Freedman, S.J. & Haberichter, W.N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A prototype ROI builder for the second level trigger of ATLAS implemented in FPGA's.

In an effort to reduce data transfer and rate requirements, the Higher Level Trigger of the ATLAS Detector uses Region of Interest (ROI) information forwarded from Level 1 Partitions on a Level 1 Accept. The ROI Builder receives these ROI fragments, which may be considerably skewed in time and may be interspersed with fragments from other events, organizes and formats from these fragments a record for each event accepted by Level 1, selects a processor to manage the event, and transfers via S-l… more

Date: December 7, 1999

Creator: Blair, R. E.; Dawson, J. W.; Haberichter, W. N. & Schlereth, J. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Construction of a high resolution electron beam profile monitor

Bremsstrahlung from an electron beam on a heavy target can be used to image the beam profile using collimators and slits. The limiting resolution using this system is determined by Fresnel diffraction, and is {approximately} {radical}({lambda}d/2), where {lambda} is the photon wavelength and d is determined by the linear dimensions of the system. For linear colliders this resolution could be a few nm. The highest resolution requires detectors which see only high energy, (small {lambda}), photon… more

Date: August 1, 1993

Creator: Norem, J.; Dawson, J.; Haberichter, W.; Novak, W.; Reed, L. & Yang, X. F.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

A gigabit ethernet link source card.

A Link Source Card (LSC) has been developed which employs Gigabit Ethernet as the physical medium. The LSC is implemented as a mezzanine card compliant with the S-Link specifications, and is intended for use in development of the Region of Interest Building (ROIB) in the Level 2 Trigger of ATLAS. The LSC will be used to bring Region of Internet Fragments from Level 1 Trigger elements to the ROIB, and to transfer compiled Region of Interest Records to Supervisor Processors. The card uses the LSI… more

Date: September 18, 2002

Creator: Blair, R. E.; Dawson, J. W.; Drake, G.; Haberichter, W. N. & Schlereth, J. L.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Development of a custom monolithic device for data acquisition from a scintillating calorimeter at the superconducting super collider

A clock-driven continuous sequential write/random read data acquisition architecture for a scintillating calorimeter at the SSC is presented. Simplicity of design and operation as well as potentially dead time-less operation are the motivations of this effort. The architecture minimizes the number of fast control signals, thereby reducing pickup from digital control lines by sensitive analog circuits in the front-end device. This architecture also reduces the logic necessary on the front-end de… more

Date: January 1, 1991

Creator: Ekenberg, T.; Dawson, J. W.; Talaga, R. L.; Stevens, A. E. & Haberichter, W. N.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Digital electronics for the inclusion of shower max and preshower wire data in the CDF second-level trigger

As part of the upgrade program at CDF, electronics has been built to bring the shower max (CES) and preshower (CPR) data into the trigger at level 2. After each crossing, 384 bits from shower max and 192 from the preshower wires are latched. Data from tracks are bussed to this module to provide the wire address and momentum which are then successively compared to the wire data in large look-up tables. Approximately 50 nanoseconds is required to determine a match, write the results in FIFO, and … more

Date: July 1, 1993

Creator: Dawson, J. W.; Byrum, K. L.; Haberichter, W. N.; Nodulman, L. J.; Wicklund, A. B.; Turner, K. J. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Online track processor for the CDF upgrade

Abstract: A trigger track processor, called the eXtremely Fast Tracker (XFT), has been designed for the CDF upgrade. This processor identifies high transverse momentum (> 1.5 GeV/c) charged particles in the new central outer tracking chamber for CDF II. The XFT design is highly parallel to handle the input rate of 183 Gbits/s and output rate of 44 Gbits/s. The processor is pipelined and reports the result for a new event every 132 ns. The processor uses three stages: hit classification, segm… more

Date: July 17, 2002

Creator: Thomson, E. J.; Ciobanu, C.; Chung, J. Y.; Gertenslager, J.; Hoftiezer, J.; Hughes, R. E. et al.

Item Type: Article

Partner: UNT Libraries Government Documents Department

open access

Recent developments on the STAR detector system at RHIC

The STAR detector system is designed to provide tracking, momentum analysis and particle identification for many of the mid-rapidity charged particles produced in collisions at the RHIC collider. A silicon vertex detector (SVT) provides three layers of tracking near the interaction point. This is followed by the main time projection chamber (TPC), which continues tracking out to 200 cm radial distance from the interaction region. The detector design also includes an electromagnetic calorimeter,… more

Date: December 1997

Creator: Argonne National Laboratory

Item Type: Article

Partner: UNT Libraries Government Documents Department