Pion correlations as a function of atomic mass in heavy ion collisions Page: 33 of 130
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CHAPTER 4. APPARATUS
There are also a number of scintillation counters for triggering, time of flight determination
and energy-loss measurement. Figure 4.1 shows the spectrometer as run in 1982 and
Figure 4.2 shows the spectrometer as run in 1986. The spectrometer was modified between
the runs by adding lead walls to protect the second wire chamber from 8-rays produced
by the beam interacting with the air downstream of the target, and replacing the second
wire chamber.
The detailed description of the components will be given in approximate order of
distance from the exit window of the beam line. The C magnet has a pole tip size of
91.4 cm by 40.6 cm and a pole gap of 20.0 cm. In this configuration the magnet can
give fields in the range of about 1 KG to about 14 KG. The magnet was mapped after
the Fe data were taken using a field mapper from the Magnetic Meaeurements group.
The field mapper measured the voltages across three orthogonal search coils as they were
moved through the field volume. The data from the mapper were processed on the BEVAX
VAX-11/780. The field mapper and processing techniques used are similar to those used
for the Janus magnet in an earlier experiment[1j.
Target Magnet fields
Set-up Material Position angle C magnet Janus magnet
Ar 0 KCl 26.0 cm 90* 14.6 KG 12.0 KG
Ar 45* KCl 2.8 cm 45* 1.7 KG 9.0 KG
Fe 0' Stainless Steel 26.0 cm 90' 14.2 KG 11.4 KG
Fe 450 Fe 0.0 cm 45* 0.0 KG 8.6 KG
Nb 0' Nb 26.0 cm 90' 13.0 KG 10.8 KG
Nb 45' Nb 0.0 cm 45' 1.5 KG 8.5 KG
Table 4.2: Spectrometer parameters for the set-ups used.
The target materials used in this experiment are given in Table 4.2. The targets were
placed in a target holder that rested on the lower pole tip of the C magnet. This places
a restriction on the choice of target in that it cannot be magnetic if the C magnet is
used. For this reason the target used in the 00 Fe runs was #304 stainless steel. The
composition of the stainless steel target (as given by the supplier, Castle Metals - A. M.
Castle & Co.) is given in Table 4.3. For the Ar run a KCl target was used to avoid the23
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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/m1/33/: accessed July 18, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.