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| − | To process the data recorded by [ | + | To process the data recorded by [https://www.isis.stfc.ac.uk/Pages/Neutron-spectroscopy.aspx Direct Inelastic Instruments] and obtain the desired cross-sections ISIS scientists use the [http://www.mantidproject.org/Main_Page Mantid-based] reduction program with a range of additional data and set-up parameters, tuning up this program to the particular inelastic instrument and experimental conditions. Users are also provided with access to the [https://isis.analysis.stfc.ac.uk/ cluster of virtual machines], dedicated to help them in processing raw experimental data into the form, which has physical meaning. |
From a user's point of view, the processing of their results should be simple and straightforward, namely: | From a user's point of view, the processing of their results should be simple and straightforward, namely: | ||
| − | # User logs into his or her [ | + | # User logs into his or her [https://data.analysis.stfc.ac.uk/ IDAaaS account] with logon name and password, obtained from the user office and launches virtual machine (creates workspace), dedicated for the instrument and technique used in the experiment. In his home directory he finds a folder with the RB-name of the proposal, approved for the experiment. |
| − | # In this RB folder user can find a python script, necessary to process the results of the experiment, obtained from the instrument. User opens this script in Mantid, changes the run numbers to the numbers obtained in the experiment, can change some reduction parameters familiar to him (the description of the parameters is provided within the script) and | + | # In this RB folder user can find a python script, necessary to process the results of the experiment, obtained from the instrument. User opens this script in Mantid, changes the run numbers to the numbers obtained in the experiment, can change some reduction parameters familiar to him (the description of the parameters is provided within the script) and runs the script to processes the results of the experiment. User should not need to set up Mantid or modify the advanced reduction parameters. |
| − | # | + | # The desktop of the users account also contains links to more advanced sample [http://horace.isis.rl.ac.uk/Main_Page Horace] and Mantid scripts for further analysis and visualization of the experimental data. Some advanced Mantid scripts are also described below. |
| − | |||
| − | + | === Services, resources and Mantid settings necessary to allow users to process their data === | |
| − | |||
| − | '''When | + | This chapter contains the information about the data reduction service, implemented in ISIS. |
| + | User should familiarize himself with the information on [[Setting up Mantid, Matlab and auxiliary programs to process results of inelastic experiments.]] | ||
| + | if he is going to set up and process results of his experiments on a computers outside ISIS. | ||
| + | |||
| + | |||
| + | <!-- | ||
| + | === Autoreduction service === | ||
| + | |||
| + | ''' <span style="color:#FF0000"> On 01/08/2017 Autoreduction service has been disabled for inelastic instruments.</span>''' | ||
| + | |||
| + | |||
| + | When Autoreduction service is enabled and set up properly, users data are also processed automatically, namely: | ||
# Within RB folder a user finds folder named '''autoreduction'''. The folder should contain the reduced data processed automatically by [https://users.facilities.rl.ac.uk/auth/?service=http://reduce.isis.cclrc.ac.uk&redirecturl=http://reduce.isis.cclrc.ac.uk/ autoreduction service], which runs on a separate powerful machine and picks up the results of the experiments as they are completed and rapidly reduces them using a script similar to the one the users have in their RB folder. | # Within RB folder a user finds folder named '''autoreduction'''. The folder should contain the reduced data processed automatically by [https://users.facilities.rl.ac.uk/auth/?service=http://reduce.isis.cclrc.ac.uk&redirecturl=http://reduce.isis.cclrc.ac.uk/ autoreduction service], which runs on a separate powerful machine and picks up the results of the experiments as they are completed and rapidly reduces them using a script similar to the one the users have in their RB folder. | ||
#If necessary and convenient, the users should be able to change some parameters and reprocess some or all their runs using the web-interface and [https://users.facilities.rl.ac.uk/auth/?service=http://reduce.isis.cclrc.ac.uk&redirecturl=http://reduce.isis.cclrc.ac.uk/ autoreduction service]. | #If necessary and convenient, the users should be able to change some parameters and reprocess some or all their runs using the web-interface and [https://users.facilities.rl.ac.uk/auth/?service=http://reduce.isis.cclrc.ac.uk&redirecturl=http://reduce.isis.cclrc.ac.uk/ autoreduction service]. | ||
#The common part of raw data processing (e.g. generation of the ''sqw'' files) can also be delegated to the [https://users.facilities.rl.ac.uk/auth/?service=http://reduce.isis.cclrc.ac.uk&redirecturl=http://reduce.isis.cclrc.ac.uk/ autoreduction service]. | #The common part of raw data processing (e.g. generation of the ''sqw'' files) can also be delegated to the [https://users.facilities.rl.ac.uk/auth/?service=http://reduce.isis.cclrc.ac.uk&redirecturl=http://reduce.isis.cclrc.ac.uk/ autoreduction service]. | ||
| − | The autoreduction service is currently working in test mode, so its | + | The autoreduction service is currently working in test mode, so its availability and reliability are not guaranteed. |
| + | --> | ||
| + | |||
| + | === [[Crystal alignment using Mantid]] === | ||
| + | |||
| + | === Reduction scripts === | ||
| + | [[ISIS direct reduction script description. ]] contains short description of the scripts, used to process results of the inelastic experiments in ISIS. | ||
| − | |||
| − | + | === Chopper parameters === | |
| − | + | Reference material containing information about choppers, used by ISIS inelastic instruments, necessary for chopper '''flux&resolution''' calculations can be found in the [[Chopper Parameters]] chapter. | |
| − | |||
| − | == Help with editing this wiki == | + | === Help with editing this wiki === |
Consult the [//meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software. | Consult the [//meta.wikimedia.org/wiki/Help:Contents User's Guide] for information on using the wiki software. | ||
Latest revision as of 16:12, 9 January 2023
ISIS Direct Inelastic Data Reduction
Inelastic data reduction is the process of transforming data obtained in inelastic scattering experiment into the data, describing inelastic cross-sections of the processes under investigation.
To process the data recorded by Direct Inelastic Instruments and obtain the desired cross-sections ISIS scientists use the Mantid-based reduction program with a range of additional data and set-up parameters, tuning up this program to the particular inelastic instrument and experimental conditions. Users are also provided with access to the cluster of virtual machines, dedicated to help them in processing raw experimental data into the form, which has physical meaning.
From a user's point of view, the processing of their results should be simple and straightforward, namely:
- User logs into his or her IDAaaS account with logon name and password, obtained from the user office and launches virtual machine (creates workspace), dedicated for the instrument and technique used in the experiment. In his home directory he finds a folder with the RB-name of the proposal, approved for the experiment.
- In this RB folder user can find a python script, necessary to process the results of the experiment, obtained from the instrument. User opens this script in Mantid, changes the run numbers to the numbers obtained in the experiment, can change some reduction parameters familiar to him (the description of the parameters is provided within the script) and runs the script to processes the results of the experiment. User should not need to set up Mantid or modify the advanced reduction parameters.
- The desktop of the users account also contains links to more advanced sample Horace and Mantid scripts for further analysis and visualization of the experimental data. Some advanced Mantid scripts are also described below.
Services, resources and Mantid settings necessary to allow users to process their data
This chapter contains the information about the data reduction service, implemented in ISIS. User should familiarize himself with the information on Setting up Mantid, Matlab and auxiliary programs to process results of inelastic experiments. if he is going to set up and process results of his experiments on a computers outside ISIS.
Crystal alignment using Mantid
Reduction scripts
ISIS direct reduction script description. contains short description of the scripts, used to process results of the inelastic experiments in ISIS.
Chopper parameters
Reference material containing information about choppers, used by ISIS inelastic instruments, necessary for chopper flux&resolution calculations can be found in the Chopper Parameters chapter.
Help with editing this wiki
Consult the User's Guide for information on using the wiki software.