ISTTOK - Wiki - Histórico de revisões

Ist23838: /* Liquid metals as PFCs */

2022-07-15T14:45:53Z

‎Liquid metals as PFCs

Ist23838: /* Liquid metals as PFCs */

2022-07-15T14:44:20Z

‎Liquid metals as PFCs

Ist23838: /* AC operation */

2022-07-15T14:37:03Z

‎AC operation

Ist23838: /* Diagnostics development */

2022-07-15T14:22:25Z

‎Diagnostics development

Ist23838: /* Diagnostics development */

2022-07-15T14:21:48Z

‎Diagnostics development

Ist23838: /* Diagnostics development */

2022-07-15T14:21:06Z

‎Diagnostics development

Ist23838: /* Diagnostics development */

2022-07-15T14:20:28Z

‎Diagnostics development

Ist23838: /* Goals and research objectives */

2022-07-15T14:05:12Z

‎Goals and research objectives

Ist23838: /* Theory contribution */

2022-07-15T14:03:40Z

‎Theory contribution

Ist23838: /* Theory contribution */

2022-07-15T14:01:59Z

‎Theory contribution

@@ Linha 42: / Linha 42: @@
 *Development of a novel Liquid Metal Limiter based on micro-channel structures.
 *Building and testing the new LML concept using gallium as liquid metal.
-*Exposure of the LML to ISTTOK plasmas.
+*Exposure of the gallium LML to ISTTOK plasmas.
 *Studying the behaviour of the limiter surface temperature increase with liquid metal re-circulation.

@@ Linha 39: / Linha 39: @@
 ====Liquid metals as PFCs====
-One of the most challenging issues with regards to the operation of a future fusion reactor is related to plasma-wall interaction. Solid materials exposed to fusion plasmas are known to suffer significant damage that reduces wall lifetime. Liquid metals have proven to be of relevance for PFC protection. Due to ISTTOK characteristics its programme has also focused on testing liquid metals PFC´s and their properties:
+One of the most challenging issues regarding the operation of a future fusion reactor is related to plasma-wall interaction. Solid materials exposed to fusion plasmas are known to suffer significant damage that reduces wall lifetime. Liquid metals have proven to be of relevance for PFC protection. Due to ISTTOK characteristics, its programme has also been focusing on testing liquid metals PFC´s and their properties:
-*Develop a novel Liquid Metal Limiter based on micro-channels structures.
+*Development of a novel Liquid Metal Limiter based on micro-channel structures.
-*Build and test the new LML concept using gallium as liquid metal.
+*Building and testing the new LML concept using gallium as liquid metal.
-*Expose this PFC to ISTTOK plasmas.
+*Exposure of the LML to ISTTOK plasmas.
-*Study the behavior of the limiter surface temperature increase with liquid metal re-circulation.
+*Studying the behaviour of the limiter surface temperature increase with liquid metal re-circulation.
 ===Data acquisition and control===

@@ Linha 32: / Linha 32: @@
 ====AC operation====
-Due to iron core saturation, operation of ISTTOK in single pulse mode is limited to 35 ms plasma duration. ISTTOK has suffer a major update of its control systems and power supplies to operate in AC mode increasing that parameter to more than 1000 ms. Within this line of research present activities include:
+The iron core saturation limits the operation of ISTTOK in single pulse mode for about 35 ms. New control systems and power supplies for the toroidal electric field and for the external magnetic poloidal field were built, aiming at increasing the operation of ISTTOK to 1 s in AC mode. Within this line of research present activities include:
 *Operation of the tokamak ISTTOK in a multi-cycle alternating plasma current regime, to obtain long duration discharges.
 *Implementation of a real-time plasma control system and study of the control of long duration AC discharges in ISTTOK.
 *Development of advanced gas feed control to improve reproducible and reliable plasmas with high performance.
-Testing of liquid metal PFC
+*Testing of plasma facing materials including liquid metals.
 ====Liquid metals as PFCs====

@@ Linha 27: / Linha 27: @@
 *A diagnostic based on 3 tomographic cameras was developed, adding to the multiple choice of diagnostics for real-time monitoring implementation in ISTTOK. The tomography diagnostic has been improved in its spacial resolution for enhanced emissivity reconstruction using analytical methods.
-*A retarding electrostatic field cylindrical energy analyzer (CEA) was built and has gone through multiple developments, allowing the measurement of the plasma potential in the core and its fluctuations.
+*A retarding electrostatic field cylindrical energy analyzer (CEA) was built and has gone through multiple developments, aiming at  the measurement of the plasma potential in the core and its fluctuations.
 ===Main achievements===

@@ Linha 26: / Linha 26: @@
 ===Diagnostics development===
-*A diagnostic based on 3 tomographic cameras has been developed, adding to the multiple choice of diagnostics for real-time monitoring implementation in ISTTOK. The tomography diagnostic was improved in its spacial resolution for enhanced emissivity reconstruction using analytical methods.
+*A diagnostic based on 3 tomographic cameras was developed, adding to the multiple choice of diagnostics for real-time monitoring implementation in ISTTOK. The tomography diagnostic has been improved in its spacial resolution for enhanced emissivity reconstruction using analytical methods.
 *A retarding electrostatic field cylindrical energy analyzer (CEA) was built and has gone through multiple developments, allowing the measurement of the plasma potential in the core and its fluctuations.

@@ Linha 26: / Linha 26: @@
 ===Diagnostics development===
-Further studies on the ISTTOK plasma emissivity reconstruction using analytical methods, aiming at the best choice for real-time implementation in ISTTOK.
+.A diagnostic based on 3 tomographic cameras has been developed, adding to the multiple choice of diagnostics for real-time monitoring implementation in ISTTOK. The tomography diagnostic was improved in its spacial resolution for enhanced emissivity reconstruction using analytical methods.
-Upgrade existing tomographic cameras to 3 x 16 channels in order to improve spatial resolution for enhanced emissivity reconstruction.
+.A retarding electrostatic field cylindrical energy analyzer (CEA) was built and has gone through multiple developments, allowing the measurement of the plasma potential in the core and its fluctuations.
 ===Main achievements===

@@ Linha 12: / Linha 12: @@
 ISTTOK has been scientifically explored for:
 * Edge plasma turbulence studies;
-* Operation and control on alternating plasma current regimes;
+* Operation and control of alternating plasma current regimes;
-* Testing of liquid metal limiter concept;
+* Testing of liquid metal limiter concepts;
 * Development and upgrade of diagnostics;
 and has also served as a test bed facility for new data acquisition concepts and hardware.

@@ Linha 18: / Linha 18: @@
 ===Theory contribution===
 The understanding of turbulent transport phenomena is of the utmost importance for both the performance and the reliable operation of future plasma fusion devices. The universality of physical aspects of the plasma edge on radically diverse tokamak devices (in terms of size, inner core performance and heating methods) renders small machines like ISTTOK as relevant for edge studies. As a small machine, ISTTOK is flexible in its operation, runs on low operation costs, has a short time scale for diagnostic implementation and is compatible with the use of electrostatic probes, one the most useful diagnostic to access edge plasma fluctuations. Present activities include:
-*Contribution for a better understanding of spontaneously generated large-scale sheared flows and its role in regulating plasma transport.
+*Contribution towards a better understanding of spontaneously generated large-scale sheared flows and its role in regulating plasma transport.
 *Characterization and control of the SOL intermittent transport.
 *Development of innovative electrostatic probe systems.

@@ Linha 17: / Linha 17: @@
 and has also served as a test bed facility for new data acquisition concepts and hardware.
 ===Theory contribution===
-Understanding turbulent transport is important to optimize the plasma confinement and for predicting the performance of future devices. Research on the comprehensive investigation of the multi-scale physics aspects of the edge turbulence, from its origin to the impact on transport including plasma-wall interaction. ISTTOK is ideal for edge physics studies due to its flexibility, low operation costs, short time scale for diagnostics implementation and compatibility with electrostatic probes. The universality of several edge physics phenomena was verified in different devices, confirming the relevance of these studies in small devices. Present activities include:
+The understanding of turbulent transport phenomena is of the utmost importance for both the performance and the reliable operation of future plasma fusion devices. The universality of physical aspects of the plasma edge on radically diverse tokamak devices (in terms of size, inner core performance and heating methods) renders small machines like ISTTOK as relevant for edge studies. As a small machine, ISTTOK is flexible in its operation, runs on low operation costs, has a short time scale for diagnostic implementation and is compatible with the use of electrostatic probes, one the most useful diagnostic to access edge plasma fluctuations. Present activities include:
-*Contribute to a better understanding of spontaneously generated large-scale sheared flows and its role in regulating plasma transport.
+*Contribution for a better understanding of spontaneously generated large-scale sheared flows and its role in regulating plasma transport.
-*Characterize and control the SOL intermittent transport.
+*Characterization and control of the SOL intermittent transport.
-*Develop different electrical probes systems for edge studies.
+*Development of innovative electrostatic probe systems.
-*Provide synergies between theory and experimental groups working on edge/SOL physics.
+*Providing synergies between theory and experimental groups working on edge/SOL physics.
-*Develop analysis tools required to process the massive experimental data obtained .
+*Development of analytical tools required to process the massive experimental data obtained.
 ===Diagnostics development===