List of web publications and news 

Description 
Date  
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Seminars about construction status of UST_2 given
Summary and links to the two talks/seminars given in May 2013 
May 2013  
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Seminars about UST_2 and reactors given in 'National Fusion Laboratory' , CIEMAT
Summary and links to the presentations given in CIEMAT in 3 seminars from 2009 to 2010 
March 2012  
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Seminar about reactor stellarators and UST_2 in 'National Fusion Laboratory' , CIEMAT

April 2009  
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Publication about UST_1 in 'Stellarator News'

December 2008  
Period of almost innactivity due to work for ITER, IFMIF, DEMO, etc, in the National Fusion Laboratory, CIEMAT, Spain. 

 

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Results from certain pulses and graphs from the Data
Acquisition System
Evolution of plasma parameters have been recorded by the Data Acquisition system: plasma wall interaction~outgassing, plasma instabilities, RF power, absortion of RF, resonant heating, magnetic field B, etc 
June 2007  
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Pulses from #227. Improving the plasmas, ECRH,
diagnostics and data acquisition systems
Table of data and brief description of the improvements and results for each pulse. Plasmas of the characteristics expected for UST_1 are sought. 
June 2007  
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Improvements in Vacuum, ECRH and DataAcquisition
systems and test of Visible Spectroscopy
The ECRH system has been equipped with a Double Stub Tuner. The Data Acquisition System is being upgraded to receive the more signals. The leak in the vacuum pump has been repaired. 
May 2007  
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Set up of mass spectrometer and first mass Spectrum
Description of the process to start up the AMETEK Dycor mass spectrometer, some information about the spectrometer and the first spectrum obtained. 
May 2007  
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Time used in each activity in the development of UST_1
Table of the time required to study, design, order, assembly, test, pulses, publish, etc to create UST_1. 
April 2007  
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Talk about UST_1 in Zaragoza, Spain. On 24st April 2007 a talk about UST_1 for general public will be held in Zaragoza. " 
March 2007  
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First ideas for the design and construction of UST_2
fusion experiment Present ideas, analysis of FRC, RFP, Spherical tokamak, etc.. Estimation of the dimensions, ECRH, Bo, parameters and features of a compact modular stellarator. 
March 2007  
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Publication about UST_1 by Milan Ripa, IPP Czech
Republic Publication for general public about UST_1 in "Lidove Noviny", the 2nd newspaper in the Czech Republic 
March 2007  
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Comparison of innovative concepts to help in the
decision of the UST_2 fusion experiment. Spherical Tokamak and IEC (Part
3) Analysis of basic features for several fusion concepts particularly the ones that have implications in the engineering cost and difficulty. Spherical Tokamak and IEC studied in Part 3 
February 2007  
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Comparison of innovative concepts to help in the
decision of the UST_2 fusion experiment. RFP and Spheromak (Part 2)
Analysis of basic features for several fusion concepts particularly the ones that have implications in the engineering cost and difficulty. RFP and Spheromak studied in Part 2 
February 2007  
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Comparison of innovative concepts to help in the
decision of the UST_2 fusion experiment. Dipole and FRC (Part 1)
Analysis of basic features for several fusion concepts particularly the ones that have implications in the engineering cost and difficulty. Dipole and FRC studied in Part 1 
February 2007  
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Comparison of drift orbits in HSX and UST_1 and
diverse simulations in HSX Simulation of Iota profile, ripple, magnetic surfaces, drift orbits and trapped particles in HSX. A 25keV trapped electron is simulated and represented in Boozerlike coordinates, both in HSX and a UST_1 stellarator of the size of HSX. 
January 2007  
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Pulses from #211. Improving the plasmas, ECRH and
vacuum systems 
January 2007  
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ECRH system in UST_1 and first tests 
January 2007  
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Optimization of particle confinement time in CNT

December 2006  
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Simulations and recalculations in CNT Simulations of the standard configuration in CNT 'Columbia Nonneutral Torus' are carried out (Iota profile, magnetic well depth, islands, magnetic surfaces...) and analysed. 
December 2006  
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Seminar about UST_1 in 'National Fusion Laboratory' ,
CIEMAT Pdf slides and link to video of the talk. It was held on 1st December 2006 in LNF, CIEMAT and caused remarkable admiration. 
December 2006  
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First rough Monte Carlo transport simulations
Simulation of paticles with collisions by two methods, "Quasireal collisions" and "Virtual Collisions". An interesting approximation to theory and to W7AS results has been obtained. 
November 2006  
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Toroidal, helical and modular ripple trapped particles
in UST_1. Representation in Boozerlike coordinates The simulation of different types of trapped particles is accomplished. Comparison with theoretical calculations. Banana and passing orbits. 
October 2006  
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Simulations in UST_1. Magnetic surfaces, islands, Iota
and Magnetic Well profiles Rationals and islands are analysed. Iota profile is decreasing and moderately flat. There is a magnetic well of 2% at edge. Rootmeansquare error of Bmin ans modular ripple is obtained 
October 2006  
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Cost of UST_1 stellarator Table containing the cost of each system and main elements : vacuum vessel, coils, power supplies, vacuum system, diagnostics ... 
August 2006  
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Correct magnetic surfaces obtained in UST_1.
Comparison between experimental results and simulations Photos and video of the experimental results of magnetic surfaces. Simulations from SimPIMF to compare theoretical magnetic surfaces with real ones. 
August 2006  
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Field line mapping results. First magnetic surfaces
observed in UST_1 Analysis of the images from some field line mapping experiments and comparison with the theoretical simulations. 
August 2006  
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Definitive modular coils. Winding process and possible
improvements Details about the assembling of the definitive modular coils for UST_1 are reported. The materials, tools, time of operations and difficulties are briefly described. 
July 2006  
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Pulses from #50 to #210. Searching for correct
magnetic surfaces Table of data and brief description of the results for each pulse 
JulyAug 2006  
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Heating system in UST_1
The planned system, calculations and design of the heating system for UST_1 is described. It is based on a commercial magnetron at first or second harmonic at 2.45GHz. 
July 2006  
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Present status of UST_1 and planned improvements
Bo, vacuum, diagnostics at the present and in near future. 
July 2006  
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List of pulses and results in UST_1 Details about the conditions and gradual improvements in the pulses in UST_1. Some results from the pulses are described. 
MayJune 2006  
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Design of the field line mapping system for UST_1
Description and photos of the ebeam system for field mapping in UST_1. Expected magnetic surfaces, ebeam power, emittance, phosphor, rod movement. 
May 2006  
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Status of the coil system. One modular coil finished
Description and photos of the process and difficulties to finally achive the mechanization of the first modular coil for UST_1. 
April 2006  
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Optimization of Iota, Iota profile, plasma size, Bmin
and magnetic well Further simulations to optimize UST_1 plasma parameters. One solution is selected. 
March 2006  
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Simulation of banana orbits in tokamaks and
stellarators Some simulations and figures of banana orbits obtained from the code. 
March 2006  
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Device to mechanise modular coils Little information is shown because a patent has been applied for. It will appear in a next future. 
February 2006  
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Status
of the vacuum vessel The status of the vacuum vessel on February 2006 is shown. Photos and graphs. 
February 2006  
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Test of modular coil windings Photos and conclusions from the test of different standard and special solid and flexible conductors and windings 
February 2006  
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Technical specifications of UST_1 Data about vacuum vessel ; number of coils, coil shape and structure ; properties of the magnetic confinement: plasma size, ripple, Iota, magnetic well, % of trapped particles; heating, Te and other. 
January 2006  
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Optimization of modular coils by means of SimPIMF v2.1
The calculation of several thousands of sets of modular coils is carried out. The ripple is minimised and the size of the plasma is maximised. Some good options are chosen. 
January 2006  
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Optimization of UST_1 for m=3, 4 and 5 periods.
Minimization of trapped particles and ripple The process for the selection of the best choice m=3,4 or 5 is described. SimPIMF v2.0 code is used to calculate relevant features of the devices. 
January 2006  
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SimPIMF v2.0 code in JAVA for simulation and
optimization of coils The new unified SimPIMF is described. The Classes and methods are briefly commented. 
December 2005  
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Energy confinement time and estimation of the heating
system in UST_1 The energy confinement time for UST_1 and for other real experiments is calculated. The heating system is outlined. 
November 2005  
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Influence of coil misalignments and manufacturing
errors in magnetic surfaces The influence of coil errors on the magnetic surfaces is analysed. 
November 2005  
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Magnetic surfaces from the improved SimPIMF v1.2 .
Calculation of rotational transforms The simulation of magnetic surfaces and islands with the improved SimPIMF code is carried out for a particular set of coils. 
November 2005  
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Simulation of trapped particles for the optimization
of UST_1 coils The simulation of trapped particles is carried out as a means for the design and optimization of the set of coils for UST_1. 
October 2005  
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Optimum Iota Profiles Analysis of Iota profile for some devices and comparison between modular stellarators versus torsatrons. 
October 2005  
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First run of the diffusion pump. History of the vacuum
progress Description of the first and following achievements in the vacuum level. 
October 2005  
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Vacuum vessel for UST_1. Status and improvements Present status, difficulties and necessary improvements in the vacuum vessel construction. 
September 2005  
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Vacuum system for UST_1
Description and present status of the vacuum system for UST_1 
September 2005  
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1200A test Pulse and setup of Data Acquisition
The experience of the first current pulses using only a battery and the data acquisition system based in PC is described. 
July 2005  
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FE stress analysis for a first outline of the vacuum
vessel of UST_1 Calculation of the Von Mises stress in the porcelain structure of the vacuum vessel for the UST_1 torus. 
July 2005  
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Forces on HF coil of the first outline of the UST_1 Calculation of the profile of the forces on the HF coil using MEMCEIv2.1 code. 
July 2005  
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First approaches for the design and construction of an
ultra small torus to experiment with fusion technologies Explanation of the present ideas about the possible alternatives, difficulties and rough parameters for the design of a homemade ultra small torus. 
June 2005  
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Thermal analysis of resistive
conductor coils in stellarators using the FEA Code_ASTER and GMSH
Calculation of thermal loads in one coil in the CTH torsatron. 
May 2005  
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Collaboration with CTH torsatron at Auburn University No information about this small collaboration with CTH torsatron will be published untill the information involved in it can be done public. 
May 2005  
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Simulation of magnetic surfaces in a
classical stellarator using SimPIMF v1.0 Simulation of one particle in a magnetic toroidal field in a classical stellarator. SimPIMF is a Java code. 
April 2005  
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Development of a basic code for
Monte Carlo simulation of trajectories of plasma particles An initial code for Monte Carlo simulation of trajectories of plasma particles. Simulation of 1000 particles. 
March 2005  
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FE stress analysis of the case for the
TF coils in HT7U using Code_ASTER and GMSH
Calculation of the displacements and stress in the case of the TF coils. Short description of Code_ASTER 
March 2005  
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Profile of the forces on TF coils of HT7U. Comparison
with the results of the HT7U team Calculation of the profile of the forces on the TF coil using more recent data. 
March 2005  
◙ Forces and momentum on TF coils of HT7U. Calculation using MEMCEI v2.1 finite element code Calculation of the profile of the forces on the TF coil and the total momentum. 
February 2005  
◙ Stray magnetic field in HT7U. Calculation using MEMCEI v2.1 finite element code Calculation of the stray field in HT7U. Comparison with the EFFI code calculations. 
February 2005  
Describes how an increment in the number of the modelled elements improve the accuracy of the results comparing with results from HT7U. 
February 2005  
◙ Magnetic field and forces calculation using MEMCEI v2.0 finite element code An evolution of the first code, MEMCEI v1.0, that uses a cylindrical element as the modellization element instead of a spherical one. It has proved a considerable increase in the accuracy using the same procesing time. 
January 2005


◙ Magnetic field and forces calculation using MEMCEI v1.0 finite element code This code obtains the magnetic field in any 3Dcoordinates using a txt data file which describes the geometry of the conductors. 
January 2005

