...
1.1. CPO - Consistent Physical Object
A Consistent Physical Object (CPO), is a data structure that contains the relevant information on a Physical Entity, e.g. the plasma equilibrium, the core plasma profiles (densities, temperature etc.), distribution functions, etc.
What is important from the user's perspective is the way CPO data are stored. Each CPO structure can be accessed via UAL documentation at the ITM portal ITM Portal.
Accessing documentation structure is fairly easy. Open ITM Portal web page in browser and navigate to ISIP related documentation.
| ITM Portal page |
|---|
  |
After documentation is opened browse to: "Data structure" (it is located at the bottom of the picture)
| ITM Portal - ISIP related section |
|---|
  |
You should see web page similar to the content of picture below
| UAL documentation |
|---|
  |
After choosing "Browse" you will see the structure of the CPOs.
| CPOs within data structure |
|---|
  |
What you can see at the picture above is collection of CPOs. All CPOs are bound to the top level element. After you expand particular CPO you can browse it's details. In this case magdiag (Magnetic diagnostics) was expanded.
| Tip |
|---|
Downloading structure If you plan to browse structure extensively, it is advised to download it to your local system. |
- know how to find CPO related documentation
- know how to browse through the tree structure
- know how to access CPO details
In this exercise you will browse documentation of CPO elements.
1. Log in into ITM Portal link
2. Browse to Documentation -> ISIP -> Data structure
3. Choose "Browse" from "Data structure 4.10b (Browse) (Download)"
4. Check few CPOs to get familiar with documentation
1.1 Structure of CPO
1.1.1 Time independent CPOs vs. time dependent CPOs
In general a CPO can contain both time-dependent and time-independent information. Typically, information related to the tokamak hardware will not be time-dependent, while the value of plasma physical quantities will likely be time dependent. Therefore the fields of a CPO can be either time- dependent or time-independent. The CPO itself will be time-independent if it contains only time- independent fields. It will be time-dependent otherwise. Only few CPOs in the ITM database are time-independent (e.g. topinfo), while the others will describe physical phenomena which vary over time.
...