Pion correlations as a function of atomic mass in heavy ion collisions Page: 38 of 130
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CHAPTER 4. APPARATUS
location (cm)
item a y z
Beam direction - -y -
Target position - 26.0 to 0.0 -
C magnet effective edge 41.0 - -
Wire Chamber 1 48.7 -48.2 0.1
Wire Chamber 2 78.5 -80.2 -0.1
Janus magnet effective edge 126.6 - -
Jar!s magnet effective edge 204.8 - -
Wire Chamber 3 237.8 -142.6 -0.6
Wire Chamber 4 316.9 -142.4 -0.2
Table 4.5: Locations of the principle components of the Janus spectrometer as used in
1986.
are similar. The effective edge approximation is discussed in detail in Chapter 5.
4.3 Fast Electronics and Computer Readout
The trigger logic used in this experiment is given in Figs. 4.4 and 4.5. A few comments
about the trigger logic diagram will be made here. The "Run Gate" was the output
from a Jorway output register, and was used to allow the computer to enable and disable
the triggers to start and stop the runs. The "Computer Free" was the inverse of the
"Computer Busy" output from the trigger module that was set when the module was
triggered, and remains set until the trigger was cleared by the computer. The "Fast Hold
Off" (from "Event" to the "Master Gate") was used to disable the "Master Gate" until
the "Computer Busy" can be asserted.
Once the event was triggered the data were acquired using standard CAMAC modules,
read out by a program running on a Bi Ra MBD-11 connected to a computer. For the Fe
data the computer was a PDP-11/45, and for the Ar/Nb data the computer was a VAX-
11/750. The PDP-11/45 based system could acquire about 200 events per spill (limited
by the tape writing during the spill), whereas the VAX-11/750 based system could acquire28
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Chacon, A.D. Pion correlations as a function of atomic mass in heavy ion collisions, report, November 26, 1989; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1055804/m1/38/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.