Simulation of Capture Capability based on Rectangular Ion Trap
Li Qi
Astronaut Research and Training Center of China, Beijing, 100094, China
Keywords: Rectangular Ion Trap, Capture Capability, Simulation, Research.
Abstract: In the ion optical simulation software, the capture capability of RIT designed was studied by simulation,
thus affecting researches on initial position and radio-frequency voltage of ion trap. Thereinto, both
frequency and voltage are the main influence factors of capture capability based on RIT. Simulation shows
that the smaller the distance between ion and the center of ion trap, the more the possibility of capture.
Therefore, suitable radio-frequency voltage and distance should be designed to ensure high-probability
capture. In the work, the simulation demand in practice is analyzed in term of research on capture capacity
of RIT.
1 INTRODUCTION
With development of society, and progress of
science and technology, quality and safety detections
of food and supplies draw more and more attention.
The technical instruments for detection are
influenced and developed towards the direction of
intelligence and miniaturization, thus affecting
design of mass spectrometer to some extent. As the
core component of mass spectrometer, the mass
analyzer plays an important role in the solution of
mass spectrometer technique. In so many technical
instruments, RIT is suitable for design standard of
modern mass spectrometer, with prominent
advantages. Consequently, simulation of capture
capability of RIT is analyzed based on ion
simulation software to further analyze technical
advantages in RIT design and application.
2 CONCEPT OF RIT
In the work, the concept of RIT is analyzed to
present its technical advantages in the process of
application and technical standard in mass
spectrometer.
2.1 Analysis on Concept of RIT
RIT is a kind of instrument consisting of two
circular electrodes and one end electrode. In general,
circular electrode is loaded with radio-frequency
voltage or DC power, meanwhile, with end electrode
earthed. With this structure, ion instability region
will be formed when the voltage reaches a certain
value. Then the corresponding mass spectrogram
will emerge when mass-change ratio constantly
increases. This principle of ion mass spectrometry
plays an important role in accurately identifying
material structure.
2.2 Development Significance of RIT
In real life, detection is very important. Mass
spectrometer, as one of common and effective
analytic instruments in professional detection filed,
is mainly used for material identification and
qualitative analysis. In mass spectrometers,
especially in high-end instruments, RIT technology
is more frequently used to capture mass
spectrometry, thus achieving testing effect. With
development of science and technology, more and
more ion identification techniques, used in practical
instruments, have become effective testing methods.
Mass spectrometer of RIT is a simplified mass
analyzer on basis of traditional ion trap.
Consequently, in actual detection, RIP will be better
used and developed with the simplification of the
mass spectrometer.
2.3 Research Background and
Meaning of Mass Spectrometer
based on RIP
With development of society and economy, living
standard and material requirements of people are
296
296
Qi L.
Simulation of Capture Capability based on Rectangular Ion Trap.
DOI: 10.5220/0006024602960299
In Proceedings of the Information Science and Management Engineering III (ISME 2015), pages 296-299
ISBN: 978-989-758-163-2
Copyright
c
2015 by SCITEPRESS Science and Technology Publications, Lda. All rights reserved
improved, bringing about some social problems such
as food safety problem. In addition, the problems of
military technology and public safety detections
draw unprecedented attention. Therefore, the mass
spectrometer is selected to solve quality and safety
problems above. At present, research on the mass
spectrometer is done as follows: on the one hand, the
mass spectrometer, with high quality, sensitivity and
accuracy, is developed for high-accuracy experiment
of academic research; on the other hand, the rapider
and smaller mass spectrometer is developed for
application in daily life. The high-accuracy mass
spectrometer is huge, complicated and inconvenient
for application in actual life. So, the spectrometer,
getting smaller and rapider, is developed based on
RIP --- the core technology of mass analyzer in the
spectrometer.
Therefore, quality detection is needed in all
fields of life, thus causing the occurrence of mass
spectrometer based on RIP. By means of
development of small-sized mass spectrometer with
high monitoring efficiency, rapid and effective
detection can be carried out, thus achieving
professional and high-frequency results in field
detection. Consequently, mass spectrometer based
on RIP has a great significance in controlling quality
and safety, as well as effectively solving material
and life problems of modern society.
2.4 Application Field of Mass
Spectrometer based on RIP
The above advantage analysis derives that mass
spectrometer based on RIP can be widely used in
many fields, presented as follows.
2.4.1 Real-time Detection of Dangerous
Goods
With development of society, dangerous goods
cause a lot of trouble to people. Therefore, in
detection field of dangerous goods, mass
spectrometer is widely used to rapidly and
accurately detect dangerous goods, thus decreasing
the damage caused by dangerous goods to some
extent.
2.4.2 Rapid Detection in Non-working
Region
Large detection instrument with high accuracy
cannot be applied in many cases such as hostile field
detection environments. So, detection instrument
based on RIP is developed for rapid and effective
field detection.
2.4.3 Detection in Closed Environments
Mass spectrometer can be used for index detection
to get accurate results in closed environments, for
example, a spacecraft. With development of
aerospace industry, more and more mass
spectrometers are applied for aeronautic detection
and widely recognized.
2.4.4 Quality Detection in Industrial
Production
Mass spectrometer, widely used in test department,
is often applied for spectrum detection of products in
industrial production. Quality of industrial products
can be effectively identified using mass
spectrometer, thus improving the whole quality of
products and ensuring quality in application.
3 OPERATION PRINCIPLE OF
MASS SPECTROMETER
With development of society, and progress of
science and technology, quality and safety detections
of food and supplies have drawn more and more
attention. The technical instruments for detection are
influenced and developed towards the direction of
intelligence and miniaturization, thus affecting
design of mass spectrometer to some extent. Mass
spectrometer is an instrument for detection in daily
life, of which mass analyzer is the core. Besides,
RIP is the core of mass analyzer. In general,
instruments such as mass spectrometer are used for
detection of food, industrial products and military
field. So, mass analyzer, as the core instrument of
mass spectrometer, is analyzed. Furthermore, RIP,
as the core of mass analyzer, is analyzed.
RIP of small and rapid mass spectrometer is
analyzed. In daily application, small mass
spectrometer is widely used with advantages such as
convenience and rapidness. Actually, principle of
mass spectrometer based on RIP is spectrum
forming and analysis. Each substance to be detected
has fixed spectrum. If the spectrum is found with
problem in the process of detection, certain
abnormal spectrum will be formed. Then the
conclusion will be achieved according to spectrum
analysis.
Simulation of Capture Capability Based on Rectangular Ion Trap
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Simulation of Capture Capability based on Rectangular Ion Trap
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4 SIMULATION OF CAPTURE
CAPACITY BASED ON RIT
Application principle of mass spectrometer is
analyzed according to concept and practical
application of mass spectrometer based on RIT.
Mass spectrometer, the most widely used in practical
detection, should be rationally applied to achieve
efficient, accurate and rapid detection. Capture
capacity of RIT is researched to get actual testing
results, thus ensuring accuracy and efficiency of
mass spectrometer. Consequently, the work focuses
on simulation of capture capacity based on RIT.
4.1 Establishment and Research of
Geometry Model based on RIT
Combined with linear and cylindrical ion traps,
geometry model of RIT is established to achieve
better programming and analysis of capture capacity
based on RIT by means of a fixed model. Linear ion
trap has advantages such as large amount of
information and high efficiency of capture, and the
cylindrical ion trap is easy to process and install.
Therefore, geometry model of RIT is excellent by
uniting advantages of the above two ion traps.
Taking a 20 20 40 cuboid region as the internal
electric field, geometry model of RIT is designed
according to the ratio of one-one in the work.
4.2 Design and Analysis of Simulation
Program of RIT
Research on simulation of capture capacity of RIT
requires programming as well as geometry
modeling. Geometry model is established for better
programming. For geometry model of RIT, different
programs can be compiled according to different
simulations. By changing electric signal and
simulation, electrode of the model can achieve
independent control. Meanwhile, both frequency and
phase of additional voltage are set as the common
values to get a real simulation effect. In conclusion,
all the simulation parameters can be compiled in the
process of programming, thus achieving
corresponding changes via actual situation.
4.2.1 Forming modes of initial position of
ion in programming
In programming, the initial position of ion is formed
by two different modes. Mode 1 is presented as
follows. There are three coordinate axes, where the
vertical is z-axis. Then a random point on z-axis can
be set as the origin. Taking the origin as the center
and a fixed value as the radius, a circle is drawn on
the xy-plane, thus forming a circular region. A
random point in the region can be selected as the
initial position of ion. Mode 2 is a simplified way of
Mode 1. In the circle of Mode 1, there are 4100
random points, where a certain point is selected as
the initial position of ion. In fact, selecting the initial
position is important for determination of other
dynamic addresses to some extent.
4.2.2 Mode Design of Dynamic Capture
Capacity in Programming
Dynamic capture capacity of RIT is designed in
programming. Thereinto, dynamic mode of capture
is discussed based on initial mode. In practice, initial
position of ion has been designed. Ion will enter RIT
and the voltage will increase when voltage is
imported through voltage terminal. Via this process,
ion in RIT, as well as the whole voltage, changes to
derive captured data. This is dynamic capture
process of RIT. Besides, mode of capture capacity is
determined according to the results.
4.3 Impact Factors of RIT Capture
Efficiency
In terms of the above design philosophy, only one
port is conducted with voltage input in the initial
stage. After ion enters RIT, the voltage of other ports
will increase. This is the main impact factor of
capture efficiency and the reason of ion capture
delay.
5 CONCLUSIONS
The work puts forward reason and necessity of mass
spectrometer application by means of analysis of
mass spectrometer and its core technology RIT. The
principle and concept of RIT is analyzed in process
of capture simulation. Using the geometric model of
RIT, the later principle design is conducted based on
advantages of linear and cylindrical ion traps.
Principles of programming and capture capacity are
acquainted, and capture delay problems due to initial
voltage are analyzed via simulation. In conclusion,
capture principle of RIT is analyzed to develop
principle, application of mass spectrometer.
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Huang Zejian, Xiong Xingchuang, Fang Xiang,
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