Terahertz Gyrotron Used for Dynamic Nuclear-Polarization-Enhanced Nuclear Magnetic Resonance

Tao Song; Wei Wang; Diwei Liu; Shenggang Liu

doi:10.3788/CJL201946.0614001

Chinese Journal of Lasers, Volume. 46, Issue 6, 0614001(2019)

Terahertz Gyrotron Used for Dynamic Nuclear-Polarization-Enhanced Nuclear Magnetic Resonance

Tao Song^1,2, Wei Wang^1,2, Diwei Liu^1,2、*, and Shenggang Liu^1,2

¹ Terahertz Research Center, School of Electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 610054, China

² Key Laboratory of Terahertz Technology, Ministry of Education, Chengdu, Sichuan 610054, China

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Figures & Tables(9)

Fig. 1. Development status of solid-state devices and vacuum electronic devices

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Fig. 2. Structure of three-section cavity and amplitude of cold cavity field

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Fig. 3. Structure of multi-section cavity

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$Diffractive quality factor Qd versus angle θ3$

Fig. 4. Diffractive quality factor Qd versus angle θ3

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Fig. 5. Resonant frequency f0 versus angle θ3

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Fig. 6. Structures of MIG. (a) Single-anode MIG; (b) double-anode MIG

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Fig. 7. Variation of electron beam quality. (a1)-(a3) Electron beam quality versus operating magnetic field at fixed voltage; (b1)-(b3) electron beam quality versus operating voltage at fixed magnetic field

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Table 1. Experimental research progress on THz gyrotron used for DNP-NMR system

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Table 1. Experimental research progress on THz gyrotron used for DNP-NMR system

Institute	f /GHz	Cavity mode	Harmonic order	Voltage /kV	Power /W	Current /mA	DNPfrequency /MHz
MIT	140	TE_0,3	1	12.3	14	25	211
	250	TE_5,2	1	9.82	>10	137	380
	330	TE_-4,3	2	10.1	18	190	500
	460	TE_11,2	2	13	16	100	700
	527	TE_11,3	2	<15	>20	<190	800
CPI	263	TE_0,3	1	13.4	>75	70	400
	395	TE_10,3	2	14.3-15.8	5-57	160	600
	527	TE_15,3	2	18.4	40	180	800
	593	-	-	17.6-18.8	1-50	158-214	900
Bridge12	198	TE_4,2	1	2-3	>5	30	300
	395	TE_9,3	2	15	>20	200	600
FU	394.6	TE_0,6	2	12	10-50	250	600
	393-396	-	-	-	50-100	-	600
	203.7/395	-	-	-	200/50	-	300/600
	131/139	-	-	-	5-60	-	200

Table 2. Parameters of 500 GHz frequency-tunable gyrotron
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Table 2. Parameters of 500 GHz frequency-tunable gyrotron
Frequency /GHz Operation mode L₁ /mm θ₁ /(°) L₃ /mm L₅ /mm θ₄ /(°) Cavity radius /mm
500 TE_8,5,_q 5 5 25 20 1.5 2.345

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Tao Song, Wei Wang, Diwei Liu, Shenggang Liu. Terahertz Gyrotron Used for Dynamic Nuclear-Polarization-Enhanced Nuclear Magnetic Resonance[J]. Chinese Journal of Lasers, 2019, 46(6): 0614001

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