The ITER Neutral Beam injectors Antonio Masiello A

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

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

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

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

NB Power balance and main specifications POWER SUPPLY 55¸ 59 BEAM SOURCE INPUT POWER 5 5 0. 2 40 The NB 4¸ 8 injector to PLASMA 17¸ 18 ACCELERATOR DUCT RID Beam energy Ion species Accelerated ion current at the grounded grid Average accelerated ion current density at the grounded grid Current density uniformity over the extraction area 0. 6 CALORIMETER NEUTRALISER Power delivered to the plasma per injector Pulse length 17¸ 20 16¸ 20 0. 05 2¸ 4 2¸ 5 1 TRANSMISSION LINE ION SOURCE OTHER POWER COMPONENTS SUPPLY BEAM LINE 16. 5 MW 1 Me. V D 40 A 200 A/m 2 10 % ≤ 3, 600 s A. Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27 -28 October, Barcelona

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

The MAMu. G accelerator 1 MV accelerator 5 stages of 200 k. V 1 segment 1280 apertures 4 segments x 4 groups, 5 x 16 apertures in a group A. Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27 -28 October, Barcelona

The beam line components Component Max heat load [MW] Max PD [MW/m 2] The Max water flow [Kg/s] Neutraliser 4. 56 2. 1 Beam 30 Line Rid Calorimeter 20 22 6 22 Components 90 198 RID A. Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27 -28 October, Barcelona Calorimeter

The NB high vacuum pumping 1 section Cryopanel: 4. 6 K supercritical He Shielding: 80 K gaseous He 1 module with 4 sections in parallel Neutraliser A. Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27 -28 October, Barcelona

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

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

Neutral Beam Test Facility at 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 12

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 13

Control system main parameters The NB Injector Control System will control the following main parameters: Ø Ø Ø 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 14

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 15

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 Standard digital outputs from CODAC Timing outputs from CODAC Ø Ø Ø Ø Temperature measurements Status signals Gas pressure meas. Residual pressure meas. B field (static) meas. Position transducers Water and gas flow meas. …… some thousands about 100 few Ø Most of the signals sampling speed is 10100 Hz Ø 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 Ø Fastest interlock 100 ms A. Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27 -28 October, Barcelona 16

References Ø ITER neutral beam heating and current drive system 2001 Design Description Document N 53 DDD Ø V. A. , Final reports, EFDA contract: TW 6 -THHN-NBD 1 Ø 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: TW 6 -THHN-NBTF 1 Ø Plant control design handbook https: //user. iter. org/? uid=27 LH 2 V&version=v 3. 0 Ø Systems Requirement Document (SRD) NBH and CD PBS 53 Ø L. Svensson, private communication A. Masiello – Colloquium on the ITER-CODAC “Plant Control Design Handbook” - 27 -28 October, Barcelona 17