The advanced photon source linac modulators PSpice simulation and upgrade

Author

Cours, A. ; Smith, T.

Author_Institution

Argonne Nat. Lab., IL, USA

fYear

2002

fDate

30 June-3 July 2002

Firstpage

270

Lastpage

273

Abstract

The APS linac modulators provide DC pulses to Thales 35/45-MW klystrons. The modulators are pulse forming network (PFN)-type pulsers with EMI 40-kV switch-mode charging supplies. The PFN consists of two 8-cell lines connected in parallel. EEV CX1836A thyratrons are used as discharge switches. The PSpice simulation of the modulators using OrCAD release 9.1 made it possible to find appropriate parameters of RC circuits that reduce high-frequency ringing of the pulse transformer primary voltage. In order to improve pulse top flatness (originally ±3%), new coils were built and installed. The coils allow discrete tuning of pulse waveforms by changing the amount of used turns. The advantage of two parallel-line PFN configurations was also used. An equivalent method using a low-voltage generator was used for PFN fine tuning.

Keywords

SPICE; circuit simulation; linear accelerators; modulators; power engineering computing; pulse generators; pulsed power supplies; pulsed power switches; switched mode power supplies; 35 to 45 MW; 40 kV; DC pulses; EEV CX1836A thyratrons; OrCAD release 9.1; PSpice; RC circuit parameters; advanced photon source linac modulators; computer simulation; discharge switches; equivalent method; low-voltage generator; pulse forming network-type pulsers; pulse waveforms discrete tuning; pulsed power supply; Coils; Electromagnetic interference; Fault location; Klystrons; Linear particle accelerator; Optical modulation; Pulse modulation; Pulse transformers; Switches; Thyratrons;

fLanguage

English

Publisher

ieee

Conference_Titel

Power Modulator Symposium, 2002 and 2002 High-Voltage Workshop. Conference Record of the Twenty-Fifth International

ISSN

1076-8467

Print_ISBN

0-7803-7540-8

Type

conf

DOI

10.1109/MODSYM.2002.1189468

Filename

1189468