PF Active Circuit Connections¶
This page describes how the MAST-U poloidal field coils are electrically connected to their power supply circuits.
Overview¶
The PF active system consists of 13 power supplies driving 25 coils through various circuit topologies (series, parallel, and anti-series configurations).
MAST-U Supplies and Coils¶
Power Supplies:
supplies = [
'D1PS', 'D2PS', 'D3PS', 'DPPS', 'D5PS', 'D6PS', 'D7PS',
'P1PS', 'EFPS', 'PXPS', 'SFPS', 'MFPS', 'RFPS'
]
Coils:
coils = [
'D1U', 'D1L', 'D2U', 'D2L', 'D3U', 'D3L', 'DPU', 'DPL',
'D5U', 'D5L', 'D6U', 'D6L', 'D7U', 'D7L', 'P1', 'PC',
'PXU', 'PXL', 'P4U', 'P4L', 'P5U', 'P5L', 'P6U', 'P6L'
]
| Supply | Coil | Geometry | Circuit | Notes |
|---|---|---|---|---|
| D1PS | D1U | d1_upper | Series | |
| D1L | d1_lower | |||
| D2PS | D2U | d2_upper | Series | |
| D2L | d2_lower | |||
| D3PS | D3U | d3_upper | Series | |
| D3L | d3_lower | |||
| DPPS | DPU | dp_upper | Series | |
| DPL | dp_lower | |||
| D5PS | D5U | d5_upper | Series | |
| D5L | d5_lower | |||
| D6PS | D6U | d6_upper | Series | |
| D6L | d6_lower | |||
| D7PS | D7U | d7_upper | Series | |
| D7L | d7_lower | |||
| P1PS | P1 | p1_inner | Parallel | 1 coil for current but two geometrically, central solenoid |
| p1_outer | ||||
| EFPS | PC | pc | Parallel | Not currently in use |
| - | - | - | - | |
| PXPS | PXU | px_upper | Series | |
| PXL | px_lower | |||
| SFPS | P4U | p4_upper | Series | |
| P4L | p4_lower | |||
| MFPS | P5U | p5_upper | Series | |
| P5L | p5_lower | |||
| RFPS | P6U | p6_upper | Anti-Series | |
| P6L | p6_lower |
Circuit Topologies¶
Series Circuit¶
In a series circuit, coils are connected end-to-end. The same current flows through all coils in the circuit.
| S1(1) | S1(2) | C1(1) | C1(2) | C2(1) | C2(2) | |
|---|---|---|---|---|---|---|
| 1 | 1 | 0 | 1 | 0 | 0 | 0 |
| 2 | 0 | 1 | 0 | 0 | 0 | 1 |
| 3 | 0 | 0 | 0 | 1 | 1 | 0 |
Parallel Circuit¶
In a parallel circuit, coils share the same voltage. The current is divided between the parallel branches.
| S1(1) | S1(2) | C1(1) | C1(2) | C2(1) | C2(2) | |
|---|---|---|---|---|---|---|
| 1 | 1 | 0 | 1 | 0 | 1 | 0 |
| 2 | 0 | 1 | 0 | 1 | 0 | 1 |
Anti-Series Circuit¶
In an anti-series circuit, coils are connected with opposite polarity. This configuration is used for coils that need to operate with reversed magnetic field direction.
| S1(1) | S1(2) | C1(1) | C1(2) | C2(1) | C2(2) | |
|---|---|---|---|---|---|---|
| 1 | 1 | 0 | 0 | 1 | 0 | 0 |
| 2 | 0 | 1 | 0 | 0 | 0 | 1 |
| 3 | 0 | 0 | 1 | 0 | 1 | 0 |
Connection Matrices¶
The complete IMAS connection matrix encodes the electrical topology of all circuits:
- 13 circuits = 13 connection matrices (one per power supply)
- 13 power supplies driving the system
- 25 coils in total across all circuits
- All coils and supplies appear in the matrix in the order defined in the IDS
- Approximately ~76 columns in the full connection matrix
Data Representation¶
The connection matrices are generated using the pf_conn_matrix custom function, which creates the appropriate circuit topology matrix for each power supply based on its configuration.
Each matrix row represents a circuit node, and columns represent: - Supply connections (S columns) - Coil connections (C columns)
Matrix values indicate electrical connectivity between nodes.
Special Cases¶
EFPS and PC (Central Coil):
- The EFPS circuit and PC coil are not currently operational
- Connection matrix expected to be parallel topology but contains all zeroes (as of 26/10/23)
- These are maintained in the IDS structure for potential future use
Full Connection Matrix Visualization¶
Data Sources¶
Circuit connection data is generated from:
- Signal: Power supply name (e.g.,
D1PS,P1PS) - Function:
pf_conn_matrix- Custom MAST-U function that generates the connection topology - Source:
CUSTOM_MASTUdata source