LINAC LOW ENERGY MODULATORS status update FERMILAB DESIGN Howie Pfeffer Jim Biggs 121912 Fermilab specs SOME OF THE TOUGH SPECS Beam Top Tilt Adj 5 kV Beam Voltage Step SR 15 kV usec ID: 762070
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LINAC LOW ENERGY MODULATORSstatus update FERMILAB DESIGN Howie Pfeffer /Jim Biggs 12/19/12
Fermilab specs SOME OF THE TOUGH SPECS: Beam Top Tilt (Adj.): +/- 5 kV Beam Voltage Step SR: 15 kV/ usecFlattop/Beam Regulation: +/- 25 VRepeatability: +/- 10 VMaximum spark Energy: < 5 Joules SOME SPECSPulse rep rate: 15 HzMaximum Output: 35 kVLoad ~100 ohmRise time (Adjustable): 150 usecFall time (Adjustable): 150 usecFlat top time (Adjustable): 160 usecBeam Length/Time (Adj.): 110 usecMaximum step size: 1.5 Kv Essentially a 35kV, 350 amp, OPAMP Capable of 15 kV/ usec slew rate
Block diagram of proposal
Marx ps block diagram
Basic Test circuit Snubber Current G eneration Circuit
Basic Test circuit
Current with step Current
Igbt 40u.5.6uhi direct Current Collector Volt Emitter Volt
Snubber capacitor mounting
Short circuit during turn on test circuit
900 volt – gate voltage Collector Volt Gate Volt Gate Control CT1 Current
900 volt, 20 usec Collector Volt Gate Volt CT1 Current CT2 Current
Short during pulse test circuit
conclusions IGBT Switching action has been confirmed with acceptable transient voltages. IGBT short circuit current limiting and safe turn-off have been confirmed for turning on into a short and “spark-type” short circuits. Design for a 10 stage pulser is complete.
Future plans Starting to specify and order parts for 10-stage Expect to have parts ordered by end of January Parts should be here in 3 months Begin mechanical design and layout beginning of February.