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dual ported memory at a 140 kilo-word rate by a scanning
ADC. The system is fully described in Reference 1.
The loss monitors were an important tool in the
Booster commissioning. Typical current in the LTB line
was 25 mA, but losses from a 1.5 mA, 25 /isec beam were
easily seen. Most of the Ring commissioning used only a
single injected turn (1.2 //sec) for a nominal intensity
of 2 x 10^-° protons, the lower design limit. Offset and
noise in the high gain state was typically 10 counts of
a maximum of 2047. Figure 2 shows the integrator
output for an interesting loss in LTB. The rapid (1-2
/nsec) rise at the edges of the pulse were explained when
the LTB BPMs showed large position excursions at the
same time (Figure 3). These are believed to be besam
swept by the chopper which survived the Linac and HEBT.
The pulse-to-pulse losses were displayed as a bar graph
in which any 2 5 selected units or groups can be dis-
played.
Fig. 2. Integrated LTB
Beam Loss Monitor
Output. 200 mV/Div.,
5 nsec/Div.
Fig. 3. Corresponding LTB
Beam Position Monitor
Output. Y-axis in mm,
X-axis in /isec.
Rina beam Current Transformers
Beam current in the Ring can be less than 100 nA at
injection to 2.9 A at full intensity. To meet the time
response requirement of < 1 /nsec to observe stacking, to
almost 3 sec for accumulating polarized beam, an injec-
tion beam monitor (BIBM) and a separate circulating beam
monitor (BCBM) were installed, each covering the full
intensity range.
The BIBM is a conventional beam current toroid7
with a sensitivity of 0.1 V/A into 50 Ohms and bandwidth
from 2 Hz to 8 MHz, enclosed in a 170 mm ID aluminum
case. The electronics, located at floor level, are
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Witkover, R.L. Beam instrumentation in the AGS Booster, article, January 1, 1991; Upton, New York. (https://digital.library.unt.edu/ark:/67531/metadc1104436/m1/4/: accessed July 16, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.