CN109830417A - A kind of multistage interaction cavity being continuously adjusted gyrotron for frequency - Google Patents
A kind of multistage interaction cavity being continuously adjusted gyrotron for frequency Download PDFInfo
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- CN109830417A CN109830417A CN201910053072.5A CN201910053072A CN109830417A CN 109830417 A CN109830417 A CN 109830417A CN 201910053072 A CN201910053072 A CN 201910053072A CN 109830417 A CN109830417 A CN 109830417A
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Abstract
The invention is a kind of multistage interaction cavity that gyrotron is continuously adjusted for frequency, its main feature is that increasing the tilt angle of the linkage section of cut-off section and interaction section, the linkage section of interaction section and deferent segment and change interaction section on the basis of traditional cavity.Using the cavity body structure, under the operating condition of low-voltage low current, change operating fields or operating voltage, it can make Terahertz gyrotron under certain working conditions, the longitudinal index q of the cavity modes of excitation is bigger, obtains bigger frequency adjustable extent, and then realizes that frequency is continuously adjustable.
Description
Technical field
The present invention relates to a kind of Terahertz gyrotron interaction cavitys applied to DNP-NMR, belong to high power Terahertz
Source technology field.
Background technique
Nuclear magnetic resonance (Nuclear Magnetic Resonance, NMR) is the atomic nucleus that magnetic moment is not zero, in external magnetic field
Zeeman splitting, the physical process of a certain specific frequency electromagnetic radiation of RESONANCE ABSORPTION occur for the lower spin energy level of effect.Since nuclear-magnetism is total
The high-resolution for spectrum of shaking, as a kind of spectral analysis method, nuclear magnetic resonance is widely used in physics, chemistry, material science and biology
Medical domain.The difference Δ n of population in NMR signal intensity and high level and low-lying level is directly proportional, still, due to core
Spin energy level it is closely spaced, level spacing is the smallest in almost all types of absorption spectrums.With the molecular change of detection
Greatly, the quantity of target atoms is reduced in unit volume, and nmr sensitivity decreases.With ultraviolet spectra, infrared spectroscopy, suitable
Magnetic resonance etc. is compared, and the sensitivity of conventional NMR spectrum is very low, so sensitivity pushes away this technology success
It is wide most important.
Dynamical nuclear polarization (Dynamic Nuclear Polarization, DNP) is one of nuclear magnetic resonance spectroscopy
Important means.Dynamical nuclear polarization is a kind of technology for combining electron spin resonance and nuclear magnetic resonance, it can enable nuclear spin
The difference Δ n of grade population is greatly increased, therefore NMR signal intensity also greatly enhances.Electromagnetic wave driving dynamical nuclear polarization be
A kind of effective ways of generally acknowledged enhancing liquid/solid NMR spectrum and imaging signal, improving magnetic field strength can increase
Level spacing increases spin energy level population difference Δ n, to improve the sensitivity of nuclear magnetic resonance.
Level spacing can be increased by improving magnetic field strength, increase spin energy level population difference Δ n, to improve nuclear magnetic resonance
Sensitivity.Modern NMR spectrum technology develops to high field direction.Developed based on electron cyclotron stimulated radiation principle
The fast wave Cyclotron to get up --- Terahertz gyrotron is used as the terahertz emission source of DNP-NMR.
Frequency is continuously adjusted Terahertz gyrotron under the operating condition of low-voltage low current, changes operating fields or work
Voltage generates the cavity modes of different longitudinal index q, and then realizes that frequency is continuously adjustable.Terahertz gyrotron interaction chamber one
As use three-stage structure.However, using this cavity body structure, under the operating condition of low current, Terahertz gyrotron institute
The longitudinal index q of the cavity modes of generation is smaller, and frequency adjustable extent is relatively narrow.Novel cavity structure is solve the problems, such as this one
Kind scheme.
Summary of the invention
A kind of novel Terahertz gyrotron interaction cavity is provided the purpose of the present invention is insufficient for the prior art, it
On the basis of traditional three-stage interaction chamber, increase linkage section and interaction section and the output of cut-off section and interaction section
The linkage section of section, to obtain bigger frequency adjustable extent.
The purpose of the present invention has following technical measures realization:
Interaction chamber is made of 5 sections of cavitys, and each cavity is grading structure.
Novel interaction cavity body structure adds linkage section between cut-off section and interaction section.
Novel interaction cavity body structure adds linkage section between interaction section and deferent segment.
The interaction section of novel interaction cavity body structure has certain tilt angle, and angle is smaller.
The present invention has the advantage that
Under the operating condition of low-voltage low current, changes operating fields or operating voltage, generate the cavity of different longitudinal index q
Mode, and then realize that frequency is continuously adjustable.Terahertz gyrotron interaction chamber generally uses the structure of three-stage.However, using
This cavity body structure, under the operating condition of low current, the longitudinal index q of the cavity modes that Terahertz gyrotron is excited compared with
Small, frequency adjustable extent is relatively narrow.Using novel cavity structure, Terahertz gyrotron can be made under certain working conditions, swashed
The longitudinal index q of the cavity modes of hair is bigger, obtains bigger frequency adjustable extent.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of novel interaction cavity.1 electron beam channel, 2 cut-off sections, 3 cut-off sections and interaction section
Linkage section, 4 interaction sections, the linkage section of 5 interaction sections and deferent segment, 6 deferent segments, 7 output smooth waveguides.
Specific embodiment
The present invention is specifically described below by embodiment, it is necessary to which indicated herein is that the present embodiment is served only for pair
The present invention is further described, and should not be understood as the limitation protected to the present invention, the personnel that are skillful in the field can root
Some nonessential modifications and adaptations are made according to the content of aforementioned present invention.
Specific embodiment are as follows:
L1For the length for ending section 2, θ1For the tilt angle for ending section 2；L2For the length of the linkage section 3 of cut-off section and interaction section
Degree, θ2For the tilt angle of the linkage section 3 of cut-off section and interaction section；L3For the length of interaction section 4, θ3For interaction section 4
Tilt angle；L4For the length of interaction section and the linkage section 5 of deferent segment, θ4For inclining for the linkage section 5 of interaction section and deferent segment
Rake angle；L5For the length of deferent segment 6, θ5For the tilt angle of deferent segment 6.
Operating mode is chosen according to the performance requirement of DNP/NMR system, chooses suitable angle and length for certain section of cavity
Degree, so that excitation operating mode.Under the operating condition of low-voltage low current, changes operating fields or operating voltage, can make
Obtain Terahertz gyrotron under certain working conditions, the longitudinal index q of the cavity modes of excitation is bigger, and obtaining bigger frequency can
Range is adjusted, and then realizes the inclination angle theta that frequency is continuously adjusted in cavity body structure1、θ2、θ4、θ53 ° generally are not exceeded, θ3It is much smaller than
1°。
Take traditional cavity body structure are as follows: L1=5mm, L2=0mm, L3=25mm, L4=20mm, L5=0mm；θ1=5 °, θ2=
0 °, θ3=0 °, θ4=0 °, θ5=1.5 °.Take improvement cavity body structure are as follows: L1=5mm, L2=3mm, L3=25mm, L4=5mm, L5=
20mm；θ1=5 °, θ2=0.01 °, θ3=0.001 °, θ4=0.01 °, θ5=1.5 °.The work frequency of traditional interaction cavity body structure
Rate is 500.74GHz to 501.80GHz, frequency tuning range 1.06GHz；The working frequency of novel cavity structure from
500.67GHz to 501.89GHz, frequency tuning range 1.22GHz.
Claims (7)
1. a kind of multistage interaction cavity for being continuously adjusted gyrotron for frequency, it is characterised in that the cavity body structure is infused by electronics
Channel, linkage section, the deferent segment for ending section, the linkage section of cut-off section and interaction section, interaction section, interaction section and deferent segment
With output smooth waveguide composition；Its order of connection are as follows: electron beam channel, cut-off section, cut-off section and interaction section linkage section, mutually
Acting section, the linkage section of interaction section and deferent segment, deferent segment and output smooth waveguide are sequentially connected.
2. a kind of multistage interaction cavity for being continuously adjusted gyrotron for frequency as described in claim 1, it is characterised in that phase
Compared with traditional interaction cavity, the cavity body structure increase cut-off section and interaction section linkage section and interaction section with it is defeated
The linkage section of section out, and the tilt angle of interaction section is changed, to obtain bigger frequency tuning range.
3. a kind of multistage interaction cavity for being continuously adjusted gyrotron for frequency as described in claim 1, it is characterised in that should
Ending section in cavity body structure is the cavity with certain tilt angle and length.
4. a kind of multistage interaction cavity for being continuously adjusted gyrotron for frequency as described in claim 1, it is characterised in that should
The linkage section for ending section and interaction section in cavity body structure is the cavity with certain tilt angle and length.
5. a kind of multistage interaction cavity for being continuously adjusted gyrotron for frequency as described in claim 1, it is characterised in that should
Interaction section is the cavity with certain tilt angle and length in cavity body structure.
6. a kind of multistage interaction cavity for being continuously adjusted gyrotron for frequency as described in claim 1, it is characterised in that should
The linkage section of interaction section and deferent segment is the cavity with certain tilt angle and length in cavity body structure.
7. a kind of multistage interaction cavity for being continuously adjusted gyrotron for frequency as described in claim 1, it is characterised in that should
Deferent segment is the cavity with certain tilt angle and length in cavity body structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910053072.5A CN109830417A (en) | 2019-01-21 | 2019-01-21 | A kind of multistage interaction cavity being continuously adjusted gyrotron for frequency |
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| CN201910053072.5A CN109830417A (en) | 2019-01-21 | 2019-01-21 | A kind of multistage interaction cavity being continuously adjusted gyrotron for frequency |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112599396A (en) * | 2020-12-16 | 2021-04-02 | 航天科工微电子系统研究院有限公司 | High-frequency cavity structure of gyrotron |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4460846A (en) * | 1981-04-06 | 1984-07-17 | Varian Associates, Inc. | Collector-output for hollow beam electron tubes |
| US4531103A (en) * | 1982-12-10 | 1985-07-23 | Varian Associates, Inc. | Multidiameter cavity for reduced mode competition in gyrotron oscillator |
| DE29514300U1 (en) * | 1995-09-06 | 1996-10-24 | Moebius Arnold | A gyrotron that is continuously adjustable in frequency |
| CN101308752A (en) * | 2008-06-11 | 2008-11-19 | 电子科技大学 | Common frequency multi-mode multi-stage whirling traveling-wave tube amplifier |
| CN103632908A (en) * | 2013-08-08 | 2014-03-12 | 中国科学院电子学研究所 | Terahertz gyrotron |
-
2019
- 2019-01-21 CN CN201910053072.5A patent/CN109830417A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4460846A (en) * | 1981-04-06 | 1984-07-17 | Varian Associates, Inc. | Collector-output for hollow beam electron tubes |
| US4531103A (en) * | 1982-12-10 | 1985-07-23 | Varian Associates, Inc. | Multidiameter cavity for reduced mode competition in gyrotron oscillator |
| DE29514300U1 (en) * | 1995-09-06 | 1996-10-24 | Moebius Arnold | A gyrotron that is continuously adjustable in frequency |
| CN101308752A (en) * | 2008-06-11 | 2008-11-19 | 电子科技大学 | Common frequency multi-mode multi-stage whirling traveling-wave tube amplifier |
| CN103632908A (en) * | 2013-08-08 | 2014-03-12 | 中国科学院电子学研究所 | Terahertz gyrotron |
Non-Patent Citations (1)
| Title |
|---|
| VITALII I. SHCHERBININ等: "Improved Cavity for Broadband Frequency-Tunable Gyrotron", 《IEEE TRANSACTIONS ON ELECTRON DEVICES》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112599396A (en) * | 2020-12-16 | 2021-04-02 | 航天科工微电子系统研究院有限公司 | High-frequency cavity structure of gyrotron |
| CN112599396B (en) * | 2020-12-16 | 2023-03-14 | 航天科工微电子系统研究院有限公司 | High-frequency cavity structure of gyrotron |
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Application publication date: 20190531 |