Raghuraj Singh

Status of the ITER ion cyclotron heating and current drive system

The paper reports on latest developments for the ITER Ion Cyclotron Heating and Current Drive system: imminent acceptance tests of a prototype power supply at full power; successful factory acceptance of candidate RF amplifier tubes which will be tested on dedicated facilities; further design integration and experimental validation of transmission line components under 6MW hour-long pulses. The antenna Faraday shield thermal design has been validated above requirements by cyclic high heat flux tests. R&D on ceramic brazing is under way for the RF vacuum windows. The antenna port plug RF design is stable but major evolution of the mechanical design is in preparation to achieve compliance with the load specification, warrant manufacturability and incorporate late interface change requests. The antenna power coupling capability predictions have been strengthened by showing that, if the plasma scrape-off layer turns out to be steep and the edge density low, the reference burning plasma can realistically be di...

Real Time controller for R&D on ITER Ion Cyclotron Heating & Current Drive Source

IndianDomestic Agency is responsible for the development and delivery of total nine numbers of RF sources for ITER ion cyclotron heating and current drive (ICH and CD) system. To validate the design of RF amplifier source, a research and development program has been initiated. Each ICH and CD source consists of two chains of amplifier, and each chain composed of low-power RF section, one solid-state power amplifier followed by two cascaded tunable high-power tube (tetrode/diacrode)-based amplifiers, high-voltage/high-current power supplies, and control system. A dedicated data acquisition and control system has been developed based on real-time (RT) PXI controller. To demonstrate the performance of RF source as required by ITER, two RT control for anode voltage regulation and voltage standing wave ratio (VSWR) for maintaining constant load power is implemented on field-programmable gate array (FPGA) module. To protect high-power RF tubes and related subsystems, interlock logic is implemented on another FPGA module, which will suppress RF input drive and switch off different biasing power supplies within

Haemorrhage control in extremity stab injury

10~\mu \text{s}

Status of R&D activity for ITER ICRF power source system

. To operate RF amplifier as per experimental requirement, user settable parameters (

Design and testing of 200 kW/91.2 MHz RF amplifier

T_{\mathrm{\scriptscriptstyle ON}}- T_{\mathrm{\scriptscriptstyle OFF}}

Real-Time Controller for Research and Development on ITER Ion Cyclotron Heating and Current Drive Source

time, number of pulses, allowed number of faults before terminating the pulse, and rise time and fall time) for RF pulse generation are incorporated into application software developed using LabVIEW platform. Two modes of data acquisition function are implemented using NI PXI-8108 RT controller (embedded real time operating system controller). All analog and digital signals for status and health monitoring of different subsystems, normal acquisition mode having 1-ms sampling rate, are implemented. For fault analysis purpose, data are acquired with 1-

Initial operation of 3 MW dual output high voltage power supply with IC RF system

\mu \text{s}

Integration & Validation of LCU with Different Sub-systems for Diacrode based amplifier

sampling frequency in trigger mode of acquisition with 100-ms predata and 100-ms postdata considering fault event as trigger for the acquisition. In this paper, architecture of RT controller is discussed in detail and various operational results are presented.

Design of high power RF amplifier for 3 MW/CW transmission line test rig

The Foley catheter is described in the emergency treatment of penetrating cardiac injuries, and its intra-operative use to control bleeding while definitive measures for intravascular embolization are being made. We present the first reported case of the use of a urinary catheter to control haemorrhage in an extremity stab injury to obtain haemodynamic stability while awaiting definitive surgical treatment. This quick, easy and useful technique can be used for junctional vascular injuries and wounds with a narrow neck, and can be easily removed once in the operating theatre. This life-saving, simple and cost-effective technique ‘internalises’ the externally applied pressure to control massive haemorrhage while awaiting definitive operative intervention. The catheter can be sutured in place if the patient is to be transferred to another department or hospital.