PAC2013 - List of Authors (Vikharev, A.A.)

Paper	Title	Page
WEPSM02	Concepts for Short Period RF Undulators	1046
	S.V. Kuzikov, A.V. Savilov, A.A. Vikharev IAP/RAS, Nizhny Novgorod, Russia
	Several concepts for room-temperature RF undulators, fed by cm- or mm- wavelength radiation and aimed to produce ~1 nm wavelength radiation using relatively low energy electron beams, are considered. The analysis shows that requirements to electron beam quality and to RF power become more severe with wavelength reduction. In order to satisfy these requirements, we suggest to build an undulator of several separate segments. In accordance with first concept each segment introduces a high-Q cavity fed by its own multi-megawatt RF source. The 30 GHz pulsed gyroklystron or gyrotrons at 30 - 300 GHz, already elaborated and tested in IAP RAS, are appealing candidates. These sources can provide the effective undulator period of 0.5 - 0.05 cm, the undulator parameter up to 1, and the effective field length of 50 cm for each segment. The second concept implies using a high-power short pulse propagating in a long corrugated waveguide where -1st field harmonic is responsible for particle wiggling. High group velocity of this pulse allows to provide long interaction of particles with RF fields.

WEPSM04	Helical Self Focusing and Cooling Accelerating Structure	1049
	S.V. Kuzikov, S. Mishakin, A.A. Vikharev IAP/RAS, Nizhny Novgorod, Russia
	A new helical RF accelerating structure, which can provide emittance control of the electron beam, is proposed. This structure combines properties of a linear accelerator and a damping ring simultaneously. It makes acceleration of straight on-axis beam as well as beam cooling due to the synchrotron radiation of particles. These properties are provided by specific slow eigen mode which consists of two partial waves, TM01 and TM11 (near to cut off). The longitudinal field of the first wave is synchronous with electrons, the transverse fields of the second wave are far from synchronous condition and they cause electron wiggling like it occurs in RF undulator. As a result the emittance control might be employed at linear trajectory of the high-energy beam without decrease of the average gradient. Calculations show that surface electric field at level ~0,31 (relative to accelerating field) and shunt impedance ~20 MOhm/m at 30 GHz are achievable. Cooling rate at gradient 100 MV/m corresponds to the equivalent magnetic field ~0,75 T.

Paper

Title

Page

Concepts for Short Period RF Undulators

1046

S.V. Kuzikov, A.V. Savilov, A.A. Vikharev
IAP/RAS, Nizhny Novgorod, Russia

Several concepts for room-temperature RF undulators, fed by cm- or mm- wavelength radiation and aimed to produce ~1 nm wavelength radiation using relatively low energy electron beams, are considered. The analysis shows that requirements to electron beam quality and to RF power become more severe with wavelength reduction. In order to satisfy these requirements, we suggest to build an undulator of several separate segments. In accordance with first concept each segment introduces a high-Q cavity fed by its own multi-megawatt RF source. The 30 GHz pulsed gyroklystron or gyrotrons at 30 - 300 GHz, already elaborated and tested in IAP RAS, are appealing candidates. These sources can provide the effective undulator period of 0.5 - 0.05 cm, the undulator parameter up to 1, and the effective field length of 50 cm for each segment. The second concept implies using a high-power short pulse propagating in a long corrugated waveguide where -1st field harmonic is responsible for particle wiggling. High group velocity of this pulse allows to provide long interaction of particles with RF fields.

WEPSM04

Helical Self Focusing and Cooling Accelerating Structure

1049

S.V. Kuzikov, S. Mishakin, A.A. Vikharev
IAP/RAS, Nizhny Novgorod, Russia

A new helical RF accelerating structure, which can provide emittance control of the electron beam, is proposed. This structure combines properties of a linear accelerator and a damping ring simultaneously. It makes acceleration of straight on-axis beam as well as beam cooling due to the synchrotron radiation of particles. These properties are provided by specific slow eigen mode which consists of two partial waves, TM01 and TM11 (near to cut off). The longitudinal field of the first wave is synchronous with electrons, the transverse fields of the second wave are far from synchronous condition and they cause electron wiggling like it occurs in RF undulator. As a result the emittance control might be employed at linear trajectory of the high-energy beam without decrease of the average gradient. Calculations show that surface electric field at level ~0,31 (relative to accelerating field) and shunt impedance ~20 MOhm/m at 30 GHz are achievable. Cooling rate at gradient 100 MV/m corresponds to the equivalent magnetic field ~0,75 T.