Test and Commissioning of 82.6 GHz ECRH system on SST-1

Bora, D.; Sathyanarayana, K.; Shukla, B. K.; Chattopadhyay, P. K.; Srinivas, Y.; Khilar, P.; Kushwah, M.; Rajnish, Kumar; Sugandhi, R.; Singh, Manoj; Babu, Rajan; P, Jatin; G, Agrajit; Biswas, Prabal; Pragnesh, D.; Kadia, B.R.; Chetan,; Patel, Harshida; Dharmesh, P. D.; Kirit, P.; Parmar, K. G.; Makwana, A.R.; Harsha, Mahendra; Soni, J.; Yadav, Vipin K.; Shmelev, M.Yu.; Belousov, V. I.; Kurbatov, V.I.; Belov, Yu.; Tai, E. M.

doi:10.1088/1742-6596/25/1/013

Cited by 15 publications

(3 citation statements)

References 4 publications

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“…In several plasma fusion machines, such as ASDEX, SST-1, JT-60, etc., two or more frequencies are used in millimeter wave band for electron cyclotron resonance heating (ECRH) and current drive of magnetically confined plasma [11][12][13]14]. Corresponding to each frequency, the gyrotron oscillators are used to supply the RF power in the power range of several hundred kW to MW.…”

Section: A N U S C R I P Tmentioning

confidence: 99%

Dual frequency gyrotron operating at 42/84 GHz for plasma fusion application

Kumar

Singh

Sihag

et al. 2015

Vacuum

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Section: A N U S C R I P Tmentioning

confidence: 99%

Dual frequency gyrotron operating at 42/84 GHz for plasma fusion application

Kumar

Singh

Sihag

et al. 2015

Vacuum

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“…The 82.6GHz/200KW and 42GHz/500kW ECRH systems are used in tokamak SST-1 [5][6] to carry out experiments related ECRH assisted breakdown and start-up at fundamental and second harmonic. The operating toroidal magnetic field of SST-1 is 0.75T, 1.5T and 3.0T, however in the beginning phase of tokamak, it is operated at 0.75T and 1.5T magnetic fields.…”

Section: Introductionmentioning

confidence: 99%

Instrumentation and control system architecture of ECRH SST1

Patel

Purohit

et al. 2017

EPJ Web Conf.

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Abstract. The Electron Cyclotron Resonance Heating (ECRH) system is an important heating system for the reliable start-up of tokamak. The 42GHz and 82.6GHz Gyrotron based ECRH systems are used in tokomaks SST-1 and Aditya to carry out ECRH related experiments. The Gyrotrons are high power microwave tubes used as a source for ECRH systems. The Gyrotrons need to be handled with optimum care right from the installation to its Full parameter control operation. The Gyrotrons are associated with the subsystems like: High voltage power supplies (Beam voltage and anode voltage), dedicated crowbar system, magnet, filament and ion pump power supplies and cooling system. The other subsystems are transmission line, launcher and dummy load. A dedicated VME based data acquisition & control (DAC) system is developed to operate and control the Gyrotron and its associated sub system. For the safe operation of Gyrotron, two level interlocks with fail-safe logic are developed. Slow signals that are operated in scale of millisecond range are programmed through software and hardware interlock in scale of microsecond range are designed and developed indigenously. Water-cooling and the associated interlock are monitored and control by data logger with independent human machine interface.

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“…This system has two microwave sources, one 42 GHz gyrotron capable of providing 500 kW power for 500 ms and one 82 GHz gyrotrons capable of delivering 200 kW power for 1000s. This power is transmitted to tokamak through corrugated waveguide based transmission system which consists of matching optical unit (MOU), DC breaks, meter bends with bidirectional coupler, polarizer and vacuum window [2][3].…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of Steerable ECRH Launcher for SST-1 Tokamak

Mistry

Shukla

2017

EPJ Web Conf.

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In the tokamaks ECRH system is used for pre-ionization, start up, heating, current drive and suppression of NTMs (Neo Classical Tearing Modes). A Standard ECRH system consists of high power microwave source Gyrotron, circular corrugated waveguide based transmission line and launcher. The Focused ECH power is launched into plasma through launcher. The microwave beam emerges out from circular corrugated waveguide and propagates freely in air with finite divergence. So focusing and plane mirror combination is used to launch focused beam in plasma. Thus an ECRH launcher consists of metallic profiled and plane mirror, UHV compatible vacuum barrier window and a UHV gate valve. One 42 GHz gyrotron capable of delivering 500 kW of power for 500 ms and other 82 GHz gyrotron capable of delivering 200 kW of power for 1000s are used for SST-1 ECRH system. The launcher design consists of mirror design, design of supports and design of steering mechanism to provide suitable movements with minimum backless error. The whole assembly is UHV compatible. The launcher is capable of steering the beams by ±20° in both toroidal and poloidal directions. Mirrors are given motion by means of one rotary and one linear feedthrough. For 82 GHz launcher active cooling is provided, whereas for 42 GHz launcher no active cooling is provided. A detailed analysis is carried out for the mirrors of the high power launcher. The heat load for the 82 GHz launcher is 2 kW (~1% absorption) and for 42 GHz launcher it is 5 kW. For 82 GHz launcher, the maximum steady state surface temperatures of focusing and reflecting mirrors are 315K and 323K and von-mises stresses are within 10 MPa. Similarly for 42 GHz launcher maximum temperatures observed during 500 ms pulse are 301K and 303K for focusing and reflecting mirrors respectively. This paper explains the mechanical and thermal design and analysis of the launcher for the ECRH system.

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Test and Commissioning of 82.6 GHz ECRH system on SST-1

Cited by 15 publications

References 4 publications

Dual frequency gyrotron operating at 42/84 GHz for plasma fusion application

Dual frequency gyrotron operating at 42/84 GHz for plasma fusion application

Instrumentation and control system architecture of ECRH SST1

Design and Analysis of Steerable ECRH Launcher for SST-1 Tokamak

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