The ITER Neutral Beam injectors

1. The ITER Neutral Beam injectors • Antonio Masiello A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

2. Residual ion Dump (RID) Accelerator Ion source Neutraliser Plasma Neutral Beam injection: principles D beam A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

3. The configuration of the NB injectors in ITER A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

4. The Neutral Beam injector A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

5. NB Power balance and main specifications POWER POWER BEAM BEAM BEAM LINE BEAM LINE 55 55 ¸ ¸ 59 59 SUPPLY SUPPLY SOURCE SOURCE 40 40 ¸ ¸ 16 17 20 20 0.05 0.05 INPUT INPUT The NB injector to to PLASMA PLASMA POWER POWER 17 17 ¸ ¸ 18 18 2 2 ¸ ¸ 5 4 1 1 4 4 ¸ ¸ 8 8 0.2 5 5 0.6 5 CALORIMETER TRANSMISSION LINE ION SOURCE NEUTRALISER DUCT OTHER COMPONENTS POWER SUPPLY RID ACCELERATOR A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

6. The ion source Half size ion source test facility Courtesy of IPP-Garching Rear view of the RF ion source A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

7. The MAMuG accelerator 1MV accelerator 5 stages of 200kV 1 segment 1280 apertures 4 segments x 4 groups, 5x16 apertures in a group A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

8. The beam line components The Beam Line Components Neutraliser Calorimeter RID A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

9. 1 section Cryopanel: 4.6K supercritical He Shielding: 80K gaseous He The NB high vacuum pumping 1 module with 4 sections in parallel Neutraliser A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

10. The Power supplies A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

11. The Power supplies A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

12. Neutral Beam Test Facilityat Padua - Italy The main risk mitigation measure for resolving NB issues The NBTF lay-out reproduces the one of the ITER NB-1 A full size source to start in 2012 A full neutral beam line to start in 2014 A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

13. Global operating states Construction and Long Term Maintenance (LTM) Short Term Maintenance (STM) Test and Conditioning Operation (TCS) • Cryopump regeneration at 400 K • Cryopump cool-down • Cryopump warm-up to ambient temperature • HV conditioning over extraction and acceleration grids • ion source plasma without extraction • ion beam accelerated • ion beam neutralized • residual ion dump active Short Term Stand-by (STS) • Cryopump regeneration at 100 K Pulse Operation State (POS) • Beam on calorimeter • Beam on target without plasma • Beam on target with plasma: beam normal operation of in ITER pulse. Beam is interlocked (e.g. tokamak plasma density) A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

14. Control system main parameters The NB Injector Control System will control the following main parameters: • Power to the RF driver • Plasma grid current • Bias Voltage • Extraction grid voltage • Acceleration grids voltages • Residual Ion dump biasing • Caesium oven temperature • Gas flows • Fast shutter control (and absolute valve) • Beam on/off-axis injection • Magnetic compensation coil current • … A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

15. Control system preliminary architecture (NBTF) CSS Central Safety System CIS Central Interlock System PSS Plant Safety system PIS Plant Interlock System Courtesy of the RFX Association A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

16. Main acquisition requirements The data acquisition system of each NB Injector will include the instrumentation needed to condition, record, display and analyze the measured signal coming from the beam line • Standard analog inputs to CODAC some thousands • Standard digital inputs to CODAC about 100 • Standard digital outputs from CODAC about 100 • Timing outputs from CODAC few • Temperature measurements • Status signals • Gas pressure meas. • Residual pressure meas. • B field (static) meas. • Position transducers • Water and gas flow meas. • …… • Most of the signals sampling speed is 10-100Hz • For higher speeds up to MHz, a baseline speed of KHz is foreseen and an event driven acquisition with a window of few ms to acquire the signal up to some MHz • Fastest interlock 100ms A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona

17. References • ITER neutral beam heating and current drive system 2001 Design Description Document N53 DDD • V. A., Final reports, EFDA contract: TW6-THHN-NBD1 • A. Luchetta et al., Final report - Preliminary specification of the architecture of the control, interlock and safety systems for the NB test facility - EFDA contract: TW6-THHN-NBTF1 • Plant control design handbook https://user.iter.org/?uid=27LH2V&version=v3.0 • Systems Requirement Document (SRD) NBH and CD PBS 53 • L. Svensson, private communication A.Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27-28 October, Barcelona