KEK ATF2 High Availability DC Magnet Power Supplies Phase 2 Progress and Specifications 31 May 2006 Paul Bellomo, Antonio de Lira, Briant Lam and Dave MacNair Stanford Linear Accelerator Center

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 2 Trip Purpose 1. Outline progress since meeting in April 2. Review the power supply specifications 3. Obtain information needed to complete the power supply specifications

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 3 200A Operation Reconfigured system, changed current transductor from 150A to 600A

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 4 Another Current Stability Run 200A, 5 modules ppm / C over 24 hours, previous tests were 8-hour runs

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 5 4 / 5 Module Efficiency 5 modules each running to 25V, 40A, 1kW output Total output maximum output 25V, 200A, 5kW

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 6 System Overview and Required AC Input 420V, 60A, 3 , 50Hz, 5W to each rack 100V, 20A, 1 , 50Hz, 3 W to each rack

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 7 Candidate Module Manufacturers IE Power Canada Dr. Sashi Dewan YesCalifornia Instruments / Argantix USA Mr. Mike Knapp Not yet responded OCEM Italy Miguel Pretelli YesElgar Electronics Corporation USA Website: Not yet responded Kepco Power Supplies USA Mr. Jim Clarke NoLambda-EMI USA John Breickner Not yet responded Matsusada California USA Not yet responded

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 8 Next Phase 2 Tasks Imminent short-term tasks Continue to locate willing power supply partners in industry Investigate fuse performance and test Evaluate need for output diode and test Continue to define power module topology and complete specifications by July Purchase 5 more modules for testing using SLAC ILC money

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 9 Demonstration System with Magnet Load When does KEK want the SLAC demonstration system? Should the demonstration system include the rack? What is the shipping address for the demonstration system?

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 10 Magnet and Power Supply Summary List

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 11 Bulk Power Supply Specifications

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 12 Bulk Power Supply Specifications Input - 420V, 3 , 5 wire input > 0.85PF, >85% eff (Matsusada – no 420V) Output Operate as voltage source, 0 to FS control, can series or parallel 45V, 200A or 45V, 300A possible ratings Output ripple voltage and noise 75mV maximum DC to 1MHz 0.1% output voltage regulation and 0.05% stability Bandwidth 1000Hz as voltage source Local control and monitors On/off switch Output voltage settable from 0V to full scale Output voltage and current digital meters On/off, loss of phase and output over-voltage Remote control/monitors – none now, but PLC proposed On/off (contact closure) Output voltage and current monitors

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 13 The Power Modules

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 14 Abridged Module Specifications Front panel on/off switch Secure front cover opposite sides

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 15 Abridged Module Specifications Input 45V, 37A Up to 5 parallelable current share within 1% Input fuse to protect solid-state components Buck regulator with internal PWM, set by external analog voltage Switching frequency ≥ 20 kHz Output 20V, 50A Ripple voltage 50mV peak-peak Voltage stability 1000 ppm per 24 hours Efficiency > 90% from 50% to 100% of full load Internal feedback loop bandwidth ≥ 50Hz Blocking diode to isolate module from others Control and monitoring Generate control power from bulk power supply Isolated input for analog setpoint voltage Accept reset to clear latched fault indicators Report module output current Monitor heat-sink temperature, output over-voltage and over-current and provide a summed fault signal

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 16 Abridged Crate Specifications Bulk supply provides control power Accepts turn on signal Provide staggered timing clocks to modules Adjust staggered timing when one module fails Report single and shutoff on two module failures Accept reset signal for latched faults Remove all power when by external signal Common/differential-mode filtering at output Iout 2ppm/ O C (10% to 100% full rated) Iout (0.1% accuracy) monitors Vout (0.5%)and ripple monitor (60mV p-p) Two transductor ground current monitor Bandwidth > 25Hz

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 17 Ethernet Power Supply Controller Control Ethernet interface 10/100 Mb/sec UTP TCP/IP stack Master/slave control using UDP packets Fixed IP or DHCP address Interfaces with available EPICS drivers PC based test program Command Summary.doc has more information Performance +/-10V, 24 bit DAC +/-12V ADC, 20 bit effective resolution 0.25 ppm/ O C reference stability Continuous calibration of ADC against reference 1 ppm/ O C typical stability Linear or cosine ramping of current

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 18 Ethernet Power Supply Controller Core Functions Ethernet control of power supply Precision current ramping and regulation Monitor magnet current and voltage Magnet protection Diagnostics (ripple current, ambient temperature) Local control Interfaces Power Supply Interface On/off control Analog setpoint control (0 - 5VDC) Monitor output voltage and ground current Monitor ripple current Supports reversing switch or bipolar supplies Digital status (ready, on, 4 spare) 2 transductors 6 interlock inputs for magnet or system protection

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 19 Ethernet Power Supply Controller Front panel diagnostic connectors Programming of processor or FPGA IP address configuration 3 diagnostic UART ports Local control of power supply General VAC, 50/60 hertz 48.3cm W x 20.3cm D x4.4cm H (1U) rack mount chassis Operates in 5 to 40 deg C environment Support SLAC will support by , phone, visit to KEK or during visits to SLAC by KEK software and network people SLAC can provide EPICS driver and software environment support Command set and other data on CD – subject to change at this point

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 20 Another Possible Rack Configuration 3 less bulk power supplies – less expensive, increased availability

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 21 SLAC Questions to Address Off-Line 1.What is the ambient temperature of the facility where the power supplies will operate? 2. Is there air conditioning available for the racks and power supplies? 3. What is the interface (if any) for the remote operation and monitoring of the bulk power supply? 4. What is the personnel protection interface (if any) 5. What is the magnet protection interface (thermal switch to Ethernet controller? 6. Are there any corrector magnets? 7. Are the corrector magnets wound on the same core as the main quad and dipole windings? Mutual coupling concerns 8. Two transductors or one transductor per power system? 9. Does KEK want to monitor ground current and trip off power supplies on excessive ground current? 10. If one transductor use 100 ohm resistor to ground. If two transductors, then monitor ground current differentially. In both cases the ground current is sent to the Ethernet Controller. 11. When does KEK want the SLAC demonstration system? 12. Should the demonstration system include the rack? 13. What is the shipping address for the demonstration system? 14.Is there a layout that shows the locations of the magnets and the power supply racks? 15.Who will approve the power supply and rack specifications?

KEK May 31, 2006 ATF2 High Availability Magnet Power Systems 22 Last Slide Summary Progress has been made since the April 29 – 30 meeting at SLAC Contacted candidate power supply manufacturers - at least two will be on- board Specification definition continues and is on target for an end of July deadline, however there are questions to answer