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

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

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,

Development and Performance of a Desktop Mass

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