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Transcript
Superconducting quadrupole magnets system in the interaction region of BEPCII CHEN, Fusan Feb. 6, 2007 Outline The interaction region (IR) and the Superconducting (SC) Magnets. – Introduction of the IR and the SC magnets. – Winding of the SC magnets. The quench protection system (QPS). – Quench detection system (QD). – Quench protection assembly (QPA) and the power supplies (PS) for the SC magnets. The commissioning of the SC magnets. – Problems revealed in the commissioning. 2/14 Interaction region of BEPCII 3/14 The SC magnets for BEPCII Coil structure – – – – – 3 anti-solenoid. Main quadrupole. Main dipole. Vertical dipole corrector. Skew quadrupole. Powering configuration – Anti-solenoids are powered in series with one main PS. – Two trimming PS are used for current tuning. AS1 AS2 AS3 ± 65A ± 65A 1300A 4/14 Winding of the magnets Made by BNL/SMD – Direct wind technology. • Wind the cable directly onto the support tube. – Serpentine style winding. • Double layers make complete poles. 5/14 Quench detection system Quench detection system (BNL) – DSP based digital quench detection system. – Easy to configure, diagnostic and query. 6/14 Quench protection assembly Quench protection actions fulfilled by three sub-systems. – Quench protection assembly interface chassis. • QPAIC sends out commands to other systems according to the quench protection logic resided in the PLC of QPAIC. • QPAIC can switch the operating mode for synchrotron radiation mode and collider mode. – Quench protection assembly and the power supply. • QPA is integrated into power supply. • QPA cuts off the powering circuit and switches the energy extraction resistor into the dump circuit. – Power supply control system. • Control system ramps down the power supplies without triggering the magnets quench at the case of common faults. 7/14 Pictures of QPA Quench protection assembly interface chassis Front Back panel view of ofpower powersupplies suppliesfor forSCB(HDC) SCB(HDC) 8/14 Test of QPA Act as predetermined logic Fast response – Quench • 0.7ms – Fault • 5ms – Coherence • 7us 9/14 Commissioning of SC Maximum test current. – Anti-solenoid: 300A / 1300A – Main quadrupole: 205A / 580A – Corrector coils: ±40A / ±65A Quench protection system is proved to be reliable. (React fast and correctly) Problems are revealed with the valve box. – Coils are grounded with resistance 2~8000 ohms. – Gas cooled lead cannot be cooled down. – Main coils quench when currents go beyond 20% operating current. – Temperature imbalance between inlet and outlet leads 10/14 Commissioning of SC Voltage monitoring during commissioning. – The voltage drops across the gas cooled lead (Vc) and across the superconducting bus inside the transfer line (Vs) are monitored independently. Outside Warm end Valve Box Area Gas Cooled Lead Quench origin Helium Tank Area Cool end Vc Transfer Line Area Magnet Area Superconducting bus Endcan of the Magnet Vs Vt 11/14 Commissioning of SC/SCQ 162A 146A With the flow controller max, start the first ramping cycle Keeping the bypass valve open, start the second ramping cycle The SC bus quenches, but the normal region does not expand Inlet Vt Outlet Vt The SC bus cannot 58A recover after opening the bypass valve The SC bus does not quench at 162A Vt almost equals to Vc and Vs equals to zero for both inlet and outlet Inlet Vs Outlet Vs The SC bus recoveres after decreasing the current with the bypass valve opened 12/14 Commissioning of SC/AS 297A 245A 197A 148A 98A 49A The inlet SC bus quench causes the jump of voltage signals while current increases to ~260A The Vt difference between the inlet and outlet shows the imbalance of the helium flow Outlet Vt Inlet Vt The normal region does not expand at 297A It is important to analyze why the outlet does not quench even the Vt higher 9A Inlet Vs Outlet Vs 13/14 Conclusion Most of the system work well. – The performance of the superconducting magnets is good during the vertical test completed in BNL. – The quench protection system can protect the magnets from any quench or faults. – The power supplies and the control system are workable although some small bugs still exist. We do meet problems. – Most of the problems occur on the valve box. Improvement is underway. – The valve box is redesigned and under machining. 14/14