Use of CCDs in the Time-Projection Chamber

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Description

The Time-Projection Chamber produces 3-dimensional information about the multiple tracks of reaction products produced by e/sup +/e/sup -/ collisions at the center of the chamber. Two dimensions (r, phi) result from processing signals from proportional wires and induction pads (a total of 17,000 signals) mounted at the end planes. The third (axial) dimension is obtained by measuring the drift time of ionization from the particle tracks to the end planes. To achieve this, all wire and pad signals (suitably shaped to about 500 ns width) are stored in Charge Coupled Devices (CCDs) which, at any moment, hold 45.5 ..mu..s of ... continued below

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Pages: 5

Creation Information

Jared, R.C.; Fujita, T.Y.; Jackson, H.G.; Sidman, S.B. & Goulding, F.S. October 1, 1981.

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Description

The Time-Projection Chamber produces 3-dimensional information about the multiple tracks of reaction products produced by e/sup +/e/sup -/ collisions at the center of the chamber. Two dimensions (r, phi) result from processing signals from proportional wires and induction pads (a total of 17,000 signals) mounted at the end planes. The third (axial) dimension is obtained by measuring the drift time of ionization from the particle tracks to the end planes. To achieve this, all wire and pad signals (suitably shaped to about 500 ns width) are stored in Charge Coupled Devices (CCDs) which, at any moment, hold 45.5 ..mu..s of signal history clocked in at a sampling rate of 10 MHz. About 40 ..mu..s after a master trigger, the history is frozen by stopping the clocking action, and a slow clock mode (20 kHz) is initiated to read out the stored samples which are then digitized (9 bits) and processed by an on-line computer. A total of 17,000 channels x 455 samples (each digitized to 9 bit accuracy) is stored in the CCDs (i.e., about 70M bits) for each event. The pulse shaping philosophy, the design of the CCD units, the drivers and the testing procedures are described.

Physical Description

Pages: 5

Notes

NTIS, PC A02/MF A01.

Source

  • IEEE symposium on nuclear science, San Francisco, CA, USA, 21 Oct 1981

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  • Other: DE82003715
  • Report No.: LBL-13184
  • Report No.: CONF-811012-29
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 6061822
  • Archival Resource Key: ark:/67531/metadc1109970

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

Office of Scientific and Technical Information (OSTI) is the Department of Energy (DOE) office that collects, preserves, and disseminates DOE-sponsored research and development (R&D) results that are the outcomes of R&D projects or other funded activities at DOE labs and facilities nationwide and grantees at universities and other institutions.

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  • October 1, 1981

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • March 26, 2018, 1:44 p.m.

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Jared, R.C.; Fujita, T.Y.; Jackson, H.G.; Sidman, S.B. & Goulding, F.S. Use of CCDs in the Time-Projection Chamber, article, October 1, 1981; United States. (digital.library.unt.edu/ark:/67531/metadc1109970/: accessed April 20, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.