WO2016166825A1 - 荷電粒子線装置、およびその真空排気方法 - Google Patents
荷電粒子線装置、およびその真空排気方法 Download PDFInfo
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- WO2016166825A1 WO2016166825A1 PCT/JP2015/061543 JP2015061543W WO2016166825A1 WO 2016166825 A1 WO2016166825 A1 WO 2016166825A1 JP 2015061543 W JP2015061543 W JP 2015061543W WO 2016166825 A1 WO2016166825 A1 WO 2016166825A1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/18—Vacuum locks ; Means for obtaining or maintaining the desired pressure within the vessel
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/02—Details
- H01J37/16—Vessels; Containers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J37/00—Discharge tubes with provision for introducing objects or material to be exposed to the discharge, e.g. for the purpose of examination or processing thereof
- H01J37/26—Electron or ion microscopes; Electron or ion diffraction tubes
- H01J37/28—Electron or ion microscopes; Electron or ion diffraction tubes with scanning beams
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/18—Vacuum control means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/18—Vacuum control means
- H01J2237/182—Obtaining or maintaining desired pressure
- H01J2237/1825—Evacuating means
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/18—Vacuum control means
- H01J2237/186—Valves
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J2237/00—Discharge tubes exposing object to beam, e.g. for analysis treatment, etching, imaging
- H01J2237/18—Vacuum control means
- H01J2237/188—Differential pressure
Definitions
- the present invention relates to a charged particle beam apparatus capable of high vacuum exhaust and low vacuum exhaust.
- Patent Document 1 evacuates an electron gun chamber with a minimum pump for the purpose of a vacuum exhaust system that enables high vacuum exhaust and low vacuum exhaust of the electron gun chamber.
- a configuration is disclosed in which a first pump (turbomolecular pump) and a second pump (oil rotary pump) that performs back-pressure exhaust of the first pump and low vacuum exhaust of the sample chamber are provided.
- Patent Document 2 generally discloses that in a low vacuum scanning electron microscope such as Patent Document 1, the sample chamber, the intermediate chamber, and the electron gun chamber are opened to the atmosphere when the sample is replaced. Therefore, for the purpose of improving throughput from sample exchange to observation, etc., it has a plurality of intermediate chambers through which an electron beam passes between the electron gun chamber and the sample chamber, and an opening between the plurality of intermediate chambers. Disclosed is an exhaust system that has a valve in its part and exhausts so that the pressure in the intermediate chamber and sample chamber on the sample chamber side from the valve is higher than the pressure in the intermediate chamber and electron gun chamber on the electron source side from the valve. ing.
- the inventor of the present application diligently studied a small vacuum pumping system that realizes high vacuum pumping and low vacuum pumping cleanly, and as a result, the following knowledge was obtained.
- Patent Document 1 as shown in FIGS. 1 and 2, the degree of vacuum in the sample chamber 10 is measured, and when the degree of vacuum falls below a predetermined degree, the valve V4 is opened and the vacuum by the oil rotary pump is opened. The room is evacuated to quickly shift from the high vacuum mode to the low vacuum mode.
- the oil evaporated from the oil rotary pump that performs preliminary evacuation in the vacuum chamber flows into the sample chamber and the vacuum exhaust pipe, thereby contaminating the inside of the apparatus such as the sample chamber and the vacuum exhaust pipe.
- the observation sample is contaminated by irradiating the observation sample arranged in the contaminated sample chamber with an electron beam. If the contamination reaches the electron gun chamber due to the use of the device for many years, the electron gun chamber may not reach a predetermined high vacuum.
- Patent Document 2 which is an improved invention of Patent Document 1, as shown in FIGS. 1 to 5, the auxiliary vacuum pump 11 preliminarily exhausts the vacuum chamber 7 and the second intermediate chamber 4 to shorten the exhaust time.
- the inside of the apparatus is contaminated by the oil evaporated from the oil rotary pump that performs preliminary exhaust of the vacuum chamber.
- dry pumps generally have disadvantages such as a larger installation space and higher cost than oil rotary pumps.
- An object of the present invention relates to high vacuum evacuation and low vacuum evacuation without contaminating the inside of the apparatus.
- the charged particle gun chamber and the sample chamber are evacuated by the main intake port of the turbo molecular pump when performing high vacuum evacuation, and the charged particle gun chamber is evacuated by the main intake port when performing low vacuum evacuation.
- the present invention relates to evacuating a sample chamber by an intermediate intake port of a turbo molecular pump.
- the oil rotary pump does not evacuate the charged particle gun chamber or the sample chamber.
- the present invention since contamination inside the apparatus can be suppressed in both high vacuum exhaust and low vacuum exhaust, it is possible to prevent the observation sample from being contaminated, and to reduce aging deterioration of the ultimate vacuum.
- FIG. 1 is a side view illustrating a configuration of a charged particle beam apparatus 100 according to a first embodiment.
- 5 is a flowchart for explaining exhaust sequence control when the charged particle beam apparatus 100 performs low-vacuum observation. It is a side view which shows the structure of the charged particle beam apparatus 100 which concerns on Example 2.
- FIG. It is a side view which shows the structure of the charged particle beam apparatus 100 which concerns on Example 3.
- FIG. It is a side view which shows the structure of the charged particle beam apparatus 100 which concerns on Example 4.
- FIG. 1 is a side view showing a configuration of a charged particle beam apparatus 100 according to the present embodiment.
- the charged particle beam apparatus 100 includes a charged particle gun chamber 1, an intermediate chamber 15, an objective lens 2, and a sample chamber 18.
- the charged particle gun chamber 1 accommodates a charged particle source that irradiates a sample with a charged particle beam.
- the intermediate chamber 15 accommodates an electron optical system, through which the charged particle beam irradiated to the sample from the charged particle gun chamber 1 passes.
- the objective lens 2 irradiates the sample with a finely focused charged particle beam.
- the sample chamber 18 accommodates a sample.
- the objective lens 2 includes an orifice 3 that limits the amount of gas blown from the sample chamber 18 in order to perform differential evacuation between the sample chamber 18 and the intermediate chamber 15.
- the charged particle gun chamber 1, the intermediate chamber 15, and the sample chamber 18 are evacuated by the composite turbo molecular pump 6.
- the composite turbo molecular pump 6 has a main intake port 11, a first intermediate intake port 13, and a second intermediate intake port 12.
- the degree of vacuum becomes lower as the distance from the main intake port 11 increases, but the first intermediate intake port 13 is located farther from the main intake port 11 than the second intermediate intake port 12.
- the degree of vacuum is lower than that of the mouth 12.
- the second intermediate intake port 12 is located closer to the main intake port 11 than the first intermediate intake port 13, and has a lower degree of vacuum than the first intermediate intake port 13 although it is lower than the main intake port 11.
- the main intake port 11 has the highest degree of vacuum
- the first intermediate intake port 13 has the lowest degree of vacuum
- the second intermediate intake port has the degree of vacuum therebetween.
- the charged particle gun chamber 1 is connected to a main intake port 11 of a composite turbo molecular pump 6 through a vacuum exhaust pipe 4.
- a vacuum gauge 8 a is disposed in the vacuum exhaust pipe 4 to monitor the degree of vacuum in the charged particle gun chamber 1.
- the sample chamber 18 is connected to the main intake port 11 through an exhaust pipe branched from the vacuum exhaust pipe 4.
- the sample chamber 18 is further connected to the first intermediate inlet 13 of the composite turbo molecular pump 6 via the vacuum exhaust pipe 22.
- the intermediate chamber 15 is connected to the second intermediate intake port 12 of the composite turbo molecular pump 6 through the vacuum exhaust pipe 5.
- the vacuum gauge 8b monitors the degree of vacuum in the sample chamber 18.
- variable flow valve NV varies the degree of vacuum in the sample chamber 18 by adjusting the amount of gas introduced into the sample chamber 18.
- the variable flow valve NV is connected to the sample chamber 18 via an exhaust pipe branched from the vacuum exhaust pipe 22.
- the valve BV1 opens and closes an exhaust pipe between the sample chamber 18 and the main intake port 11.
- the valve SV2 opens and closes the vacuum exhaust pipe 22.
- the valve SV3 opens and closes an exhaust pipe between the exhaust port of the composite turbo molecular pump 6 and the auxiliary vacuum pump 7.
- the valve SV4 opens and closes between the sample chamber 18 and the variable flow valve NV.
- the leak valve LV1 opens the charged particle gun chamber 1, the intermediate chamber 15, and the sample chamber 18 to the atmosphere.
- the leak valve LV2 opens the back pressure side of the composite turbo molecular pump 6 to the atmosphere.
- the auxiliary vacuum pump 7 is connected to the back pressure side of the composite turbo molecular pump 6 and performs back pressure exhaust of the composite turbo molecular pump 6.
- the auxiliary vacuum pump 7 can be configured using a relatively inexpensive pump such as an oil rotary pump.
- the control unit 110 controls the entire operation of the charged particle beam device 100 such as each valve, each pump, and the electron optical system.
- the control unit 110 can be configured using an arithmetic device such as a microcomputer or a CPU (Central Processing Unit).
- the diameter of the vacuum exhaust pipe 4 connected to the main intake port 11 of the composite turbo molecular pump 6 is increased to improve the conductance. Thereby, a low ultimate pressure is obtained.
- the sample chamber 18 accommodates many components such as a sample stage for mounting a sample and moving an observation field, and a detector for detecting a signal from the observation sample. Therefore, since the sample chamber 18 has a larger volume than the charged particle gun chamber 1 and the intermediate chamber 15, the conductance is improved by increasing the diameter of the exhaust pipe branched from the vacuum exhaust pipe 4 and connected to the sample chamber 18. I am letting. This shortens the exhaust time and obtains a low ultimate pressure.
- a differential exhaust throttle is disposed between the charged particle gun chamber 1 and the intermediate chamber 15 and between the intermediate chamber 15 and the sample chamber 18.
- gas blows up from the sample chamber 18 to the intermediate chamber 15 through the orifice 3.
- the intermediate chamber 15 By exhausting the intermediate chamber 15 through the second intermediate intake port 12, it is possible to suppress gas blow-up from the intermediate chamber 15 to the charged particle gun chamber 1.
- the charged particle gun chamber 1 is maintained in a high vacuum state.
- the diameter of the evacuation pipe 5 is formed smaller than the diameter of the evacuation pipe 4.
- the sample chamber 18 Since the pressure in the sample chamber 18 is higher than the pressure in the charged particle gun chamber 1 and the pressure in the intermediate chamber 15, the sample chamber 18 is connected to the first intermediate intake port 13 away from the main intake port 11. Thereby, the charged particle gun chamber 1 is maintained in a high vacuum state. Since the vacuum exhaust pipe 22 is used in a low vacuum exhaust sequence which will be described later, the diameter of the portion where the vacuum exhaust pipe 22 is connected to the first intermediate intake port 13 is made smaller than the diameter of the vacuum exhaust pipe 5, so that other exhaust pipes are formed. The conductance is made smaller than that.
- the controller 110 opens the valves BV1 and SV3 and closes the valves SV2, SV4, LV1, LV2, and NV.
- the charged particle gun chamber 1 and the sample chamber 18 are exhausted through the main intake port 11 of the composite turbo molecular pump 6, and the intermediate chamber 15 is exhausted through the second intermediate intake port 12 of the composite turbo molecular pump 6.
- the intermediate chamber 15 is where the charged particle beam irradiated from the charged particle gun chamber 1 to the sample chamber 18 passes, and the influence of the degree of vacuum on the observation is relatively small. Therefore, the intermediate chamber 15 is exhausted through the second intermediate intake port 12, and the volume exhausted by the main intake port 11 is reduced accordingly, and the exhaust time of the charged particle gun chamber 1 and the sample chamber 18 is shortened.
- FIG. 2 is a flowchart for explaining the exhaust sequence control when the charged particle beam apparatus 100 performs low-vacuum observation. Hereinafter, each step of FIG. 2 will be described.
- Step S201 The control unit 110 starts the atmosphere release mode.
- the controller 110 first closes the valves SV2, SV3, SV4 and stops the composite turbo molecular pump 6. Thereafter, the leak valve LV1 is opened, and the charged particle gun chamber 1, the intermediate chamber 15, and the sample chamber 18 are opened to the atmosphere.
- Step S202 After the user replaces the sample in the sample chamber 18, the control unit 110 starts a low vacuum exhaust mode described below.
- the control unit 110 closes the valves LV1, SV2, and SV4 and opens the valves BV1 and SV3 (S203).
- the controller 110 starts evacuating the charged particle gun chamber 1, the intermediate chamber 15, and the sample chamber 18 by the composite turbo molecular pump 6 (S204).
- the controller 110 continues the exhaust until the measured value of the vacuum gauge 8b reaches a preset degree of vacuum, for example, 500 Pa (S205).
- Step S204 Supplement
- Step S206 When the set vacuum degree is obtained, the controller 110 first closes the valve BV1. Next, the control unit 110 opens the valve SV2 and exhausts the sample chamber 18 through the first intermediate intake port 13 of the composite turbo molecular pump 6. Next, the controller 110 opens the valve SV4 and starts controlling the variable flow valve NV. The control unit 110 adjusts the degree of vacuum in the sample chamber 18 with the variable flow valve NV. The control unit 110 may always read the value of the vacuum gauge 8b and automatically control the flow rate of the variable flow rate valve NV. Further, the pressure in the sample chamber 18 can be finely adjusted by using the variable flow rate valve NV and exhaust through the first intermediate intake port 13 in combination.
- Step S207 The user starts low-vacuum observation of the sample when the degree of vacuum in the sample chamber 18 reaches a desired low degree of vacuum.
- the pressure in the sample chamber 18 is adjusted in step S206 so that the pressure in the sample chamber 18 is, for example, 1 to 270 Pa.
- the charged particle beam apparatus 100 exhausts the sample chamber 18 through the first intermediate intake port 13 of the composite turbo molecular pump 6 when performing low vacuum evacuation.
- the oil evaporated from the oil rotary pump is contained in the charged particle beam device 100 (sample chamber 18, charged particle gun chamber 1, electro-optics). System) and the like.
- contamination of the charged particle beam device 100 and the observation sample can be prevented, and vacuum evacuation that is cleaner than before can be performed.
- the intermediate chamber 15 is always exhausted through the second intermediate intake port 12. Thereby, not only high vacuum exhaust can be performed in a short time, but the intermediate chamber 15 does not require a valve for opening and closing the second intermediate intake port 12, and there is an advantage that the exhaust system is downsized.
- the composite turbo molecular pump 6 is stopped when the sample is exchanged. This eliminates the need for a valve for maintaining the vacuum of the composite turbo molecular pump 6, thereby providing an advantage that the exhaust system is downsized.
- FIG. 3 is a side view showing the configuration of the charged particle beam apparatus 100 according to the present embodiment.
- the charged particle beam apparatus 100 according to the present embodiment includes a second intermediate chamber 16 and a vacuum exhaust pipe 21 in addition to the configuration described in the first embodiment.
- the composite turbo molecular pump 6 includes a third intermediate intake port 14 in addition to the configuration described in the first embodiment.
- the third intermediate intake port 14 is located closer to the main intake port 11 than the first intermediate intake port 13, and is located farther from the second intermediate intake port 12 to the main intake port 11. That is, the third intermediate intake port 14 has a degree of vacuum between the first intermediate intake port 13 and the second intermediate intake port 12.
- the vacuum exhaust pipe 21 connects between the second intermediate chamber 16 and the third intermediate intake port 14.
- An orifice for performing differential exhaust is provided between the intermediate chamber 15 and the second intermediate chamber 16. Other configurations are the same as those of the first embodiment.
- the second intermediate chamber 16 can be exhausted in parallel with the intermediate chamber 15 via the third intermediate intake port 14.
- the diameter of the vacuum exhaust pipe 21 is, for example, smaller than the diameter of the vacuum exhaust pipe 5 and larger than the diameter of the portion where the vacuum exhaust pipe 22 is connected to the first intermediate intake port 13. Can be formed.
- the charged particle beam apparatus 100 includes a plurality of intermediate chambers, differential evacuation can be performed in the path from the sample chamber 18 to the charged particle gun chamber 1. Thereby, the degree of vacuum of the charged particle gun chamber 1 can be kept higher while exhibiting the same effect as in the first embodiment.
- FIG. 4 is a side view showing the configuration of the charged particle beam apparatus 100 according to the present embodiment.
- the charged particle beam apparatus 100 according to the present example includes a bypass pipe that connects the intermediate chamber 15 and the sample chamber 18 in addition to the configuration described in the first embodiment. Further, a valve SV5 for opening and closing the vacuum exhaust pipe 5 and a valve SV6 for opening and closing the bypass pipe are provided. Other configurations are the same as those in the first embodiment.
- control unit 110 opens the valves BV1, SV3, SV6 and closes the valves SV2, SV4, SV5, LV1, LV2, NV.
- the charged particle gun chamber 1 and the sample chamber 18 are exhausted through the main intake port 11, and the intermediate chamber 15 is exhausted through the bypass piping and the sample chamber 18 through the main intake port 11.
- control unit 110 When performing low-vacuum observation in this embodiment, the control unit 110 performs steps S201 to S205, then closes the valves BV1 and SV6, opens the valves SV2 and SV5, and passes through the first intermediate intake port 13. The sample chamber 18 is evacuated and the intermediate chamber 15 is evacuated through the second intermediate intake port 12. Thereafter, the control unit 110 adjusts the degree of vacuum in the sample chamber 18 using the variable flow rate valve NV as in the first embodiment. The subsequent steps are the same as in the first embodiment.
- the intermediate chamber 15 is exhausted by the main intake port 11 via the bypass pipe and the sample chamber 18 at the time of high vacuum observation. Can also be increased. Since the volume of the intermediate chamber 15 is smaller than the volume of the sample chamber 18, the influence of a decrease in the degree of vacuum due to the increase in volume is small, and the degree of vacuum in the sample chamber 18 hardly changes. Therefore, it is particularly useful in applications where it is desirable to increase the degree of vacuum in the intermediate chamber 15.
- a bypass pipe connected to the charged particle gun chamber 1 may be provided, and the intermediate chamber 15 may be exhausted via the charged particle gun chamber 1. Since the charged particle gun chamber 1 has a smaller capacity than the sample chamber 18 and the total amount of the charged particle gun chamber 1 and the intermediate chamber 15 is small, the degree of vacuum of the intermediate chamber 15 can be further increased.
- FIG. 5 is a side view showing the configuration of the charged particle beam apparatus 100 according to the present embodiment.
- the composite turbo molecular pump 6 does not include the second intermediate intake port 12 described in the first embodiment.
- the intermediate chamber 15 and the composite turbo molecular pump 6 are connected by an exhaust pipe branched from the vacuum exhaust pipe 4 (or an exhaust pipe connecting the vacuum exhaust pipe 4 and the sample chamber 18). Other configurations are the same as those in the first embodiment.
- the operation of the charged particle beam apparatus 100 according to the present embodiment is the same as that of the first embodiment. However, since there is no second intermediate intake port 12 in this embodiment, the intermediate chamber 15 is exhausted via the main intake port 11 of the composite turbomolecular pump 6 in both cases of high vacuum observation and low vacuum observation. Will do. In the fourth embodiment, since the second intermediate intake port 12 is not provided, there is an advantage that the structure of the composite turbo molecular pump 6 is simplified.
- FIG. 6 is a side view showing the configuration of the charged particle beam apparatus 100 according to the present embodiment.
- the charged particle beam apparatus 100 according to the present embodiment includes a second sample chamber 18 a in the sample chamber 18.
- a thin film 18b is disposed between the sample chamber 18 and the second sample chamber 18a.
- the thin film 18b is configured to pass a charged particle beam emitted from the charged particle gun chamber 1, and further serves to separate the vacuum state between the sample chamber 18 and the second sample chamber 18a.
- the sample When observing a sample in this embodiment, the sample is placed in the second sample chamber 18a, the sample chamber 18 is evacuated, and the second sample chamber 18a is opened to atmospheric pressure.
- the sample when the sample is damaged in a vacuum atmosphere, such a sample can be observed by using the second sample chamber 18a (see, for example, JP-A-2012-221766).
- the second sample chamber 18a can be depressurized (or evacuated).
- the second sample chamber 18a and the auxiliary vacuum pump 7 are connected via an exhaust pipe, and a valve SV7 for opening and closing the exhaust pipe is provided. By opening and closing the valve SV7, it is possible to select whether or not the second sample chamber 18a is decompressed.
- the present invention is not limited to the embodiments described above, and includes various modifications.
- the above embodiments have been described in detail for easy understanding of the present invention, and are not necessarily limited to those having all the configurations described.
- a part of the configuration of one embodiment can be replaced with the configuration of another embodiment.
- the structure of another Example can also be added to the structure of a certain Example.
- another configuration can be added, deleted, or replaced.
- the configuration example of the low-vacuum scanning electron microscope for observing the sample in a vacuum environment has been described.
- a scanning transmission electron microscope, a transmission electron microscope, a focused ion beam apparatus, etc. The same configuration can be used when the sample chamber is evacuated.
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Abstract
Description
制御部110は、大気開放モードを開始する。大気開放モードにおいて、制御部110はまずバルブSV2、SV3、SV4を閉じ、複合ターボ分子ポンプ6を停止する。その後、リークバルブLV1を開き、荷電粒子銃室1、中間室15、および試料室18を大気開放する。
ユーザが試料室18内の試料を交換した後、制御部110は以下に説明する低真空排気モードを開始する。
制御部110は、バルブLV1、SV2、SV4を閉じるとともに、バルブBV1、SV3を開く(S203)。制御部110は、複合ターボ分子ポンプ6により荷電粒子銃室1、中間室15、および試料室18の排気を開始する(S204)。制御部110は、真空計8bの測定値があらかじめ設定した真空度、例えば500Paに到達するまで排気を継続する(S205)。
本ステップにおいて、荷電粒子銃室1と試料室18は主吸気口11を介して排気し、中間室15は第2中間吸気口12を介して排気することになる。
設定真空度が得られると、制御部110はまずバルブBV1を閉じる。制御部110は次にバルブSV2を開き、複合ターボ分子ポンプ6の第1中間吸気口13を介して試料室18を排気する。制御部110は次にバルブSV4を開き、可変流量バルブNVの制御を開始する。制御部110は、可変流量バルブNVにより試料室18の真空度を調整する。制御部110は、真空計8bの値を常時読み取り、可変流量バルブNVの流量を自動制御するようにしてもよい。また可変流量バルブNVと第1中間吸気口13を介した排気を併用して試料室18内の圧力を微調整することもできる。
ユーザは、試料室18の真空度が所望の低真空度に達した時点で、試料の低真空観察を開始する。低真空観察時は、試料室18の圧力が例えば1~270Paとなるように、ステップS206において試料室18の圧力を調整する。
本発明は上記した実施例の形態に限定されるものではなく、様々な変形例が含まれる。上記実施例は本発明を分かりやすく説明するために詳細に説明したものであり、必ずしも説明した全ての構成を備えるものに限定されるものではない。また、ある実施例の構成の一部を他の実施例の構成に置き換えることもできる。また、ある実施例の構成に他の実施例の構成を加えることもできる。また、各実施例の構成の一部について、他の構成を追加・削除・置換することもできる。
2:対物レンズ
3:オリフィス
4、5:真空排気管
6:複合ターボ分子ポンプ
7:補助真空ポンプ
8a、8b:真空計
11:主吸気口
12:第2中間吸気口
13:第1中間吸気口
14:第3中間吸気口
15:中間室
16:第2中間室
18:試料室
18a:第2試料室
18b:薄膜
21、22:真空排気管
100:荷電粒子線装置
BV1、SV1~SV7:バルブ
NV:可変流量バルブ
Claims (18)
- 試料に対して荷電粒子線を照射する荷電粒子源を収容する荷電粒子銃室と、
前記試料を配置する試料室と、
前記荷電粒子銃室および前記試料室を真空排気するターボ分子ポンプと、
前記ターボ分子ポンプの主吸気口と前記荷電粒子銃室との間を連結する第1排気管と、
前記ターボ分子ポンプの中間吸気口と前記試料室との間を連結する第2排気管と、
前記試料室と前記第1排気管との間を連結する第3排気管と、
前記第2排気管を開閉する第1バルブと、
前記第3排気管を開閉する第2バルブと、
を備える荷電粒子線装置。 - 請求項1記載の荷電粒子線装置において、
前記ターボ分子ポンプを背圧排気する油回転ポンプを備え、
当該油回転ポンプが前記荷電粒子銃室または前記試料室を真空排気しないことを特徴とする荷電粒子線装置。 - 請求項2記載の荷電粒子線装置において、
前記第1バルブおよび前記第2バルブならびに前記ターボ分子ポンプを制御する制御部を備え、
当該制御部は、前記試料室を所定真空度より高い高真空度に排気するときは、前記第1バルブを閉じるとともに前記第2バルブを開けた上で、前記ターボ分子ポンプの前記主吸気口により前記荷電粒子銃室および前記試料室を真空排気し、
前記試料室を前記所定真空度よりも低い低真空度に排気するときは、前記第1バルブを開けるとともに前記第2バルブを閉じた上で、前記ターボ分子ポンプの前記主吸気口により前記荷電粒子銃室を真空排気し、かつ前記中間吸気口により前記試料室を真空排気することを特徴とする荷電粒子線装置。 - 請求項3記載の荷電粒子線装置において、
前記制御部は、前記試料室を前記所定真空度より低い低真空度に排気するときは、前記第1バルブを閉じるとともに前記第2バルブを開けた上で、前記ターボ分子ポンプの前記主吸気口により前記試料室を予備排気した後に、前記第1バルブを開けるとともに前記第2バルブを閉じた上で、前記ターボ分子ポンプの前記中間吸気口により前記試料室を真空排気することを特徴とする荷電粒子線装置。 - 請求項2記載の荷電粒子線装置において、
前記ターボ分子ポンプにおいて前記中間吸気口より前記主吸気口に近い位置にある第2中間吸気口と、前記荷電粒子銃室と前記試料室を接続する中間室と、の間を連結する第4排気管を備えることを特徴とする荷電粒子線装置。 - 請求項5記載の荷電粒子線装置において、
前記第1排気管と前記主吸気口を連結する箇所の直径は、前記第4排気管と前記第2中間吸気口を連結する箇所の直径よりも大きく形成され、
前記第4排気管と前記第2中間吸気口を連結する箇所の直径は、前記第2排気管と前記中間吸気口を連結する箇所の直径よりも大きく形成されている
ことを特徴とする荷電粒子線装置。 - 請求項5記載の荷電粒子線装置において、
前記第3排気管を開閉する第3バルブと、
前記荷電粒子銃室または前記試料室と前記中間室との間を連結するバイパス配管と、
を備えることを特徴とする荷電粒子線装置。 - 請求項2記載の荷電粒子線装置において、
前記荷電粒子銃室と前記試料室を接続する中間室と、前記第1排気管との間を連結する第4排気管を備えることを特徴とする荷電粒子線装置。 - 請求項2記載の荷電粒子線装置において、
前記試料室の内部に、前記試料を配置する第2試料室を備え、
当該第2試料室は、前記試料に対して照射された荷電粒子線を透過させるとともに前記第2試料室の真空状態を前記試料室の真空状態から分離する膜が配置されることを特徴とする荷電粒子線装置。 - 請求項3記載の荷電粒子線装置において、
前記第2排気管から分岐する第5排気管と、当該第5排気管に流れる流体の流量を調整する可変流量バルブとを備えることを特徴とする荷電粒子線装置。 - 荷電粒子線装置の荷電粒子銃室および試料室を真空排気する排気方法であって、
前記試料室を所定真空度より高い高真空度に排気するときは、ターボ分子ポンプの中間吸気口と前記試料室を閉塞した上で、前記ターボ分子ポンプの主吸気口と前記荷電粒子銃室および前記試料室を連結し、前記主吸気口により前記荷電粒子銃室および前記試料室を真空排気し、
前記試料室を前記所定真空度よりも低い低真空度に排気するときは、前記主吸気口と前記試料室を閉塞した上で、前記主吸気口と前記試料室を連結し、さらに前記中間吸気口と前記試料室を連結し、前記主吸気口により前記荷電粒子銃室を真空排気しつつ、前記中間吸気口により前記前記試料室を真空排気する排気方法。 - 請求項11記載の排気方法において、
油回転ポンプにより前記ターボ分子ポンプを背圧排気しつつ、当該油回転ポンプが前記荷電粒子銃室または前記試料室を真空排気しないことを特徴とする排気方法。 - 請求項12記載の排気方法において、
前記試料室を前記所定真空度より低い低真空度に排気するときは、前記中間吸気口と前記試料室を閉塞した上で、前記主吸気口と前記荷電粒子銃室および前記試料室を連結し、前記主吸気口により前記試料室を予備排気した後に、前記主吸気口と前記試料室を閉塞した上で、前記中間吸気口と前記試料室を連結し、前記中間吸気口により前記前記試料室を真空排気する排気方法。 - 請求項12記載の排気方法において、
前記ターボ分子ポンプにおいて前記中間吸気口より前記主吸気口に近い位置にある第2中間吸気口と、前記荷電粒子銃室と前記試料室を接続する中間室と、を常に連結し、前記第2中間吸気口により前記中間室を真空排気することを特徴とする排気方法。 - 請求項12記載の排気方法において、
前記試料室を所定真空度より高い高真空度に排気するときは、前記ターボ分子ポンプにおいて前記中間吸気口より前記主吸気口に近い位置にある第2中間吸気口と、前記荷電粒子銃室と前記試料室を接続する中間室と、を閉塞した上で、前記荷電粒子銃室または前記試料室と前記中間室とを連結し、前記主吸気口により前記週刊室を真空排気し、
前記試料室を前記所定真空度よりも低い低真空度に排気するときは、前記荷電粒子銃室または前記試料室と前記中間室とを閉塞した上で、前記第2中間吸気口と前記試料室を連結し、第2中間吸気口により前記中間室を真空排気することを特徴とする排気方法。 - 請求項12記載の排気方法において、
前記荷電粒子銃室と前記試料室を接続する中間室と、前記主吸気口と、を常に連結し、前記主吸気口により前記中間室を真空排気することを特徴とする排気方法。 - 請求項12記載の排気方法において、
前記試料室の真空状態とは分離されている第2試料室と、前記油回転前ポンプとを連結し、前記油回転ポンプにより前記第2試料室を減圧または真空排気することを特徴とする排気方法。 - 請求項12記載の排気方法において、
前記試料室を前記所定真空度よりも低い低真空度に排気するときは、可変流量バルブにより前記試料室に流れる流体の流量を調整することを特徴とする排気方法。
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