1. LHC circuit modeling Meeting 2 March 2011

2. PSpice Electrical modeling of the various LHC circuits, as a tool to: Describe the ac behavior of magnets Better understand the functioning of a circuit Observe/detect anomalous behavior of a circuit in the machine Better understand the reason for this anomalous behavior Improve the functioning of a circuit Understand the coupling between circuits … Comsol and QP3 Thermo-electrodynamic modeling of specific parts of LHC circuits: ‘Hot spot’ calculations during quenches Detailed stability analysis of joints and other circuit singularities Quench/Voltage propagation at the start of a quench Set or adapt quench threshold values …

3. TypeCircuit# of c.I_maxConverterMagnet# of m. RB 813000RPTEMB154 RQ RQD RQF 1613000RPHEMQ47 / 51 RQX 87180RPHFC+RPHGC+RPMBC2xMQXA+2xMQXB4 IPD RD1 46100RPHFMBX1 RD2 84670RPHGBMBRC1 RD3 26340RPHFDMBRS2 RD4 26650RPHFDMBRB1 ! ! E.R.

4. TypeCircuit# of c.I_maxConverterMagnet# of m. IPQ RQ4 1039002xRPHHMQY2 RQ5 1246502xRPHGBMQML2 RQ6 646502xRPHGBMQML2 RQ6 446502xRPHGB2xMQM+2xMQML4 RQ7 1058202xRPHGAMQM4 RQ8 1258202xRPHGAMQML2 RQ9 1258202xRPHGA2xMQM+2xMQMC4 RQ10 1258202xRPHGAMQML2 ! ! E.R.

5. TypeCircuit# of c.I_maxConverterMagnet# of m.EE 600 A RCD 2+14600RPMBBMCD76 / 77EE RCS 1+15600RPMBBMCS153 / 154EE ROD & ROF 16+2+14600RPMBBMO8 / 11 / 13EE RQ6 8490RPMBBMQTLH6EE RQS 17600RPMBAMQS2No EE RQS 7600RPMBAMQS4EE RQT64600RPMBAMQT1No EE RQTD and RQTF32600RPMBBMQT8EE RQTL64600RPMBAMQTLI1EE RSD and RSF 8+24+8+24 600RPMBBMS9 / 10 / 11 / 12EE RSS15600RPMBBMSS4EE RCBXH24600RPMBBMCBXH1No EE RCBXV24600RPMBBMCBXV1No EE RQSX38600RPMBBMQSX1No EE RU2500RPMBBMU1EE E.A. ! ))

6. TypeCircuit# of c.I_maxConverterMagnet# of m. 80-120 A RCO 16110RPLBMCO77 RCBCH 70+14110 / 86RPLBMCBCH1 RCBCV 70+14110 / 86RPLBMCBCV1 RCOSX3 8110RPLBMCOSX1 RCOX3 8110RPLBMCOX1 RCSSX3 8110RPLBMCSSX1 RCSX38110RPLBMCSX1 RCTX38110RPLBMCTX1 RCBYH3877RPLBMCBYH1 RCBYV 3877RPLBMCBYV1 60 A RCBH 3761RPLAMCBH1 RCBV 3761RPLAMCBV1 )) )) )) M.D.

7. Common approach in modeling components current leads power supplies (incl. crowbars, thyristors, …) magnets ground connections switch and dump of the Energy extraction (EE) heater firing …

8. Where to find useful input information for our models field maps: MSC-MDA (Bernhard Auchmann) material data: Inside program QP3 power supply specs: Web site EPC group (see link) magnet test data: data from SM-18 and Block 4 MCD: Davide Tommasini MQS / MQT /MQTL: Mateusz Bednarek MS / MO / MSS: Michele Modena

9. Model validation Fast Power Abort (FPA) test in the machine (data in PM browser at 200-250 Hz) Quench (natural or induced) in the machine (usually 200-250 Hz) (data in PM browser at 200-250 Hz) Tests in the machine with dedicated measurement equipment (up to 1 MHz) Magnet & diode & current leads tests in SM-18 and Block 4 Data from the Power hall (B-377)

10. Web site cern.ch/LHC-CM: Links to useful web sites (HWC, electrical circuit data base, EPC group, …) Documentation of material properties:  (T,RRR,B), k(T,RRR,B), T C (B), J C (B,T), C P (T), … Field maps of magnets Schematics of models in PSpice and Comsol Results of simulations PM files from the machine, used for comparison/validation of the simulations How to do’s (useful hints for PSpice and Comsol) Presentations during meetings …

11. Next meeting Model of a MCBY magnet (Manuel) Model of a 13 kA converter (Emmanuele) Comsol model of the 13 kA joint+shunt (Daniel) RQS circuit model (Evangelia)