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LINAC LOW ENERGY MODULATORS STATUS UPDATE FERMILAB DESIGN Howie Pfeffer/Jim Biggs 12/19/12

LINAC LOW ENERGY MODULATORS status update

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FERMILAB DESIGN Howie Pfeffer /Jim Biggs 12/19/12. LINAC LOW ENERGY MODULATORS status update. Fermilab specs. SOME SPECS Pulse rep rate:15 Hz Maximum Output: 35 kV Load ~100 ohm Rise time (Adjustable):150 usec - PowerPoint PPT Presentation

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Page 1: LINAC LOW ENERGY MODULATORS status update

LINAC LOW ENERGY MODULATORSSTATUS UPDATE

FERMILAB DESIGNHowie Pfeffer/Jim Biggs

12/19/12

Page 2: LINAC LOW ENERGY MODULATORS status update

FERMILAB SPECS

SOME OF THE TOUGH SPECS:Beam Top Tilt (Adj.): +/- 5 kVBeam 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, OPAMPCapable of 15 kV/usec slew rate

Page 3: LINAC LOW ENERGY MODULATORS status update

BLOCK DIAGRAM OF PROPOSAL

Page 4: LINAC LOW ENERGY MODULATORS status update

MARX PS BLOCK DIAGRAM

Page 5: LINAC LOW ENERGY MODULATORS status update

BASIC TEST CIRCUIT

SnubberCurrent GenerationCircuit

Page 6: LINAC LOW ENERGY MODULATORS status update

BASIC TEST CIRCUIT

Page 7: LINAC LOW ENERGY MODULATORS status update

CURRENT WITH STEP

Current

Page 8: LINAC LOW ENERGY MODULATORS status update

IGBT 40U.5.6UHI DIRECTCurrent

Collector Volt

Emitter Volt

Page 9: LINAC LOW ENERGY MODULATORS status update

SNUBBER CAPACITOR MOUNTING

Page 10: LINAC LOW ENERGY MODULATORS status update

SHORT CIRCUIT DURING TURN ON TEST CIRCUIT

Page 11: LINAC LOW ENERGY MODULATORS status update

900 VOLT – GATE VOLTAGE

Collector Volt

Gate Volt

Gate Control

CT1 Current

Page 12: LINAC LOW ENERGY MODULATORS status update

900 VOLT, 20 USEC

Collector Volt

Gate Volt

CT1 Current

CT2 Current

Page 13: LINAC LOW ENERGY MODULATORS status update

SHORT DURING PULSE TEST CIRCUIT

Page 14: LINAC LOW ENERGY MODULATORS status update
Page 15: LINAC LOW ENERGY MODULATORS status update

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.

Page 16: LINAC LOW ENERGY MODULATORS status update

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.