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The Zero-Degree Detector SystemWe will report on a detector system used for accelerator measurement of nuclear fragmentation cross sections. This system consists of two detector planes, each carrying a ring of 8 detectors. Each detector has 64 pads. These two detector planes are arranged facing each other so that the matching detector pads on each plane form a two element charged particle telescope. Each of these telescopes is capable of determining the elemental identity of nuclear fragments passing through it. The system is used to measure light fragment production in the presence of heavier fragments. We will present a detailed discussion of the 64-pad detector design, the substrate design. The front-end electronics used to read out the signals is based on a custom VLSI chip developed for the Advanced Thin Ionization Calorimeter experiment which has been flown successfully twice in Antarctica. Each of these chips has 16 channels and each channel consists of a charge-sensitive preamplifier followed by a shaping amplifier and a track-and-hold circuit. The track-and-hold circuits are connected via a multiplexer to an output line driver. This allows the held signals to be presented, one-by-one via a common data line to a analog-to-digital converter. Because the output line driver can be placed in a high input impedance state when not in use, it is possible to daisy-change many chips on the same common data line. The front-end electronics and data readout scheme will be discussed in detail. The Zero Degree Detector has been used in several accelerator experiments conducted at the NASA Space Radiation Laboratory and the Alternating Gradient Synchrotron at Brookhaven National Laboratory as well as at the HIMAC accelerator in Japan. We will show examples of data taken at these accelerator runs to demonstrate how the system works.
Document ID
20060024880
Acquisition Source
Marshall Space Flight Center
Document Type
Conference Paper
Authors
Adams, James H.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Christl, Mark J.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Howell, Leonard W.
(NASA Marshall Space Flight Center Huntsville, AL, United States)
Kouznetsov, Evgueni
(Alabama Univ. Huntsville, AL, United States)
Date Acquired
August 23, 2013
Publication Date
January 1, 2006
Subject Category
Mechanical Engineering
Meeting Information
Meeting: Symposium on Radiation Measurements and Applications Conference Proceedings: Nuclear Instruments and Methods in Physica Research A
Location: Ann Arbor, MI
Country: United States
Start Date: May 23, 2006
End Date: May 25, 2006
Distribution Limits
Public
Copyright
Other

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