IPAC2017 - List of Authors (Gough, C.H.)

Paper	Title	Page
MOPIK104	Top-Up Injection With Anti-Septum	774
	C.H. Gough, M. Aiba PSI, Villigen PSI, Switzerland
	We present a novel improvement for injection into the very restricted machine aperture of future light source synchrotrons. A conventional injection scheme is based on a septum to deflect the injected bunch plus a fast pulsed three or four kicker bump to bring the stored beam close to the septum wall. With the novel improvement, the bump kickers are fitted with a thin wall longitudinal metal plate which screens the injected bunch from deflection without changing the stored beam bump behaviour. This metal screen then forms the final septum, but inverted in function of the conventional approach, hence the name anti-septum. The approach does not remove the need for the main septum magnet, but for modest cost it permits the injected bunch to be brought closer to the stored beam. Application of the anti-septum to the SLS-2 project and simulation results on a prototype are presented.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK104
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WEPIK098	Resonant Kicker System With Sub-part-per-million Amplitude Stability	3174
	M. Paraliev, C.H. Gough PSI, Villigen PSI, Switzerland
	High stability resonant kicker magnet systems have been developed as part of the fast electron beam switching system of Swiss Free Electron Laser (SwissFEL). They are designed to separate two closely spaced electron bunches (28 ns apart) accelerated in one RF macro-pulse and to send them to two separate undulator lines. High shot-to-shot amplitude stability is required to minimize the disturbance of the electron beam trajectories and to ensure stable X-ray lasing. The stability and speed was unlikely to be achieved by standard pulsed systems and a novel 18 MHz, lumped-element resonator deflector with high Q was developed. It is driven into resonance by a specialized pulsed RF driver. At resonance, the circulating currents can approach 300 A and the resulting magnetic field gives the required deflection to the electron bunches. The advanced DC offset measurement system is also described in this paper. The measured stability reached less than 1 ppm (10e-6) rms, well within the project requirements.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK098
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THPIK096	Jitter Measurement to 10ppm Level for Pulsed RF Power Amplifiers 3 - 12GHz	4314
	C.H. Gough, S. Dordevic, M. Paraliev PSI, Villigen PSI, Switzerland
	Linacs for FEL applications require a low jitter RF path from RF source through pulsed amplifiers, klystron / modulators and cavities. For the SwissFEL project, pulsed solid state power amplifiers of the 500W / 3us class for driving the klystrons were required. For these amplifiers, a stable and reliable interferometer system was developed to measure the residual RF jitter levels to <10 ppm (parts per million) and <10 urad (0.6mdeg) rms. This paper describes the system and gives some measurement results for 3GHz, 5.7GHz and 12GHz amplifiers.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK096
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Top-Up Injection With Anti-Septum

774

C.H. Gough, M. Aiba
PSI, Villigen PSI, Switzerland

We present a novel improvement for injection into the very restricted machine aperture of future light source synchrotrons. A conventional injection scheme is based on a septum to deflect the injected bunch plus a fast pulsed three or four kicker bump to bring the stored beam close to the septum wall. With the novel improvement, the bump kickers are fitted with a thin wall longitudinal metal plate which screens the injected bunch from deflection without changing the stored beam bump behaviour. This metal screen then forms the final septum, but inverted in function of the conventional approach, hence the name anti-septum. The approach does not remove the need for the main septum magnet, but for modest cost it permits the injected bunch to be brought closer to the stored beam. Application of the anti-septum to the SLS-2 project and simulation results on a prototype are presented.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-MOPIK104

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

WEPIK098

Resonant Kicker System With Sub-part-per-million Amplitude Stability

3174

M. Paraliev, C.H. Gough
PSI, Villigen PSI, Switzerland

High stability resonant kicker magnet systems have been developed as part of the fast electron beam switching system of Swiss Free Electron Laser (SwissFEL). They are designed to separate two closely spaced electron bunches (28 ns apart) accelerated in one RF macro-pulse and to send them to two separate undulator lines. High shot-to-shot amplitude stability is required to minimize the disturbance of the electron beam trajectories and to ensure stable X-ray lasing. The stability and speed was unlikely to be achieved by standard pulsed systems and a novel 18 MHz, lumped-element resonator deflector with high Q was developed. It is driven into resonance by a specialized pulsed RF driver. At resonance, the circulating currents can approach 300 A and the resulting magnetic field gives the required deflection to the electron bunches. The advanced DC offset measurement system is also described in this paper. The measured stability reached less than 1 ppm (10e-6) rms, well within the project requirements.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-WEPIK098

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

THPIK096

Jitter Measurement to 10ppm Level for Pulsed RF Power Amplifiers 3 - 12GHz

4314

C.H. Gough, S. Dordevic, M. Paraliev
PSI, Villigen PSI, Switzerland

Linacs for FEL applications require a low jitter RF path from RF source through pulsed amplifiers, klystron / modulators and cavities. For the SwissFEL project, pulsed solid state power amplifiers of the 500W / 3us class for driving the klystrons were required. For these amplifiers, a stable and reliable interferometer system was developed to measure the residual RF jitter levels to <10 ppm (parts per million) and <10 urad (0.6mdeg) rms. This paper describes the system and gives some measurement results for 3GHz, 5.7GHz and 12GHz amplifiers.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2017-THPIK096

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)