Computer control and monitoring of neutral beam injectors on the 2XIIB CTR experiment at LLL Page: 2 of 8
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COMPUTER CONTROL AND MOIYITORI1lG OF
NEUTRAL BEAM INJECTORS O1 THE 20II CTR EXPERIMENT AT LLL"
University of California, Lawrence Livermore Laboratory
Livermore, California 94550
Inc original manual control system for the 12
neutral beam injectors on the 2i1lB Machine is being
integrated with a computer control system. This, in
turn, is a part of a multiple computer network com-
prised of the three computers which are involved in
the operation and initru-entation of the 2X118 exper-
iment. The computer control system simplifies neutral
beam operation and centralizes it to a single operating
position. A special purpose console utilizes computer
generated graphics and interactive function entry but-
tons to optimize the human/machine interface. Through
the facilities of the corouter network, a high level
controll function will be implemented for the use of
the experimenter in a remorely located experiment diag-
nostics area. In addi tion to controlling the injec-
tors in normal operation, the computer system provides
automatic conditieing of the injectors, bringing re-
built units back to full energy output with minimum
less of useful life. The computer system also provides
detail archive data recording.
The purpose of using a computer for neutral beam
monitoring and control is to improve the quality of
data available to the experinmenter and to simplify and
partially automate the control of the neutral beam.
Integration with the computer system results in
significant improvement in the collection of diagnostic
and operating data. In addition to logging the various
control settings existing before each shot, at least
84 signals must be monitored during the 10 millisecond
experiment pulse. The computer system acquires this
information through a high speed A/D converter and pro-
vides it to toe experimenter and machine operator in
a reduced sunnary format for ease of use. A permanent
archive record of operations is kept on magnetic tape
for analysis of source and control system operation.
Normal operation of the neutral beams is simpli-
fied by the use of the computer. The over 70 ampli tude
related controls are reduced to 12 parameters entered
at a centralized operator console. Normal operation is
improved by a more rigorous adherance to the mathemat-
ical rules governing source operation and the corre-
spondingly smaller dependence on human judgement and
moory. Improved quality of source operation results
from corrputer control of the critical but tedious pro-
cess of conditioning the sources to their full opera-
ting potential. Useful lifetime is increased due to a
shorter exposure time to a lower probability of acci-
One of the principal advantages of the computer
control system is its ability to accomodate the many
combinations of modes of operation and modes of control
that occur with the simultaneous operation of 12 neutral
For those sources which have been conditioned to
their maximum operating potential, a semi-autoratic
node of operation is provided. Operation of such
sources is reduced to a single control pararoter, with
the computer calculating the correct coordinated values
of the remaining controls and setting them to tneir
proper settings. The computer bases its settings cn
the individual source characteristics erpirically de-
termined during the conditioning phase of operation.
Foe those sources which have recently been re-
built and have not yet been brought back to their rax-
imum operating potential, the computer control system.
provides an automatic conditioning mode of operation.
A conditioning "strategy" is selected and the source
is operated at successively higher energy levels ac-
cordingly to t'iis strategy. If a particular so.-rce is
reluctant to break in rapidly or reach theoretically
optimum performance, the conditioning routine adapts
the conditioning strategy and parameters to fit the
indi tidual characteristics of the source.
At various times in the conditioning of each
source, a test is made with a calorineter to determine
the optimum beam focus parameters and correct recha.-
Ical aiming. The program provides a special mode of
operation, performing analysis of the calorimeter sig-
Detail archive data collection is provided, with
the conditiOns and results of each shot recorded on
a magnetic tap- by the computer. This data is used
by the experimenters to correlate neutral beam events
with effects seen in other 2X115 diagnostics. The
data is also used to analyze the operation of the beams
and control system.
)ata collected by the computer is reduced on-line
between experiment shots and presented in various tab-
ular and graphical forms to the experimenter and ma-
The comuter used to implement this system is a
16 bit Hewletc-Packard 2100' with 32K RAN memory. A
magnetic tape system is used for archival data re-
cording. A Tektronix 4010 graphics terminal is used as
a system console. A block diagram of the system is
given in Figure 1. The computer is a meiber of a dis-
tributed system network, shown in Figure 2, which ctn-
nects the three 2ii8 computers. Te network fat'i-
ties are used for program generation and for the pool-
ing of shot result data.
"Reference to a company or product name does not imply
approval or reconmendation of the product by the
University of California or the United States Energy
Research and envelopment Administration to the exclu-
sion of others that may be suitable.
*Work performed under the auspicious of the (Sifted States Energy Research and Development Administration.
Contract No. W-7405-Eng.-48.
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Pollock, G.G. Computer control and monitoring of neutral beam injectors on the 2XIIB CTR experiment at LLL, article, November 18, 1975; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc870344/m1/2/: accessed December 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.