Achievement of in the superconducting nine-cell cavities for TESLA

Lilje, L.; Kako, E.; Kostin, D.; Matheisen, A.; Möller, W.-D.; Proch, D.; Reschke, D.; Saito, Kenji; Schmüser, Peter; Simrock, S.; Suzuki, Takashi; Twarowski, K.

doi:10.1016/j.nima.2004.01.045

Cited by 55 publications

(33 citation statements)

References 5 publications

(11 reference statements)

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“…The 280eV energy gain corresponds to a peak accelerating gradient of about 50MeV/m, comparable to the current limit in conventional (RF) linear accelerators, e.g. TESLA at DESY [12]. Figure 1 shows that depending on the starting phase, i.e., the relative timing between electron position and optical phase, acceleration and deceleration can be observed.…”

Section: Simulationsupporting

confidence: 54%

Acceleration of non-relativistic electrons at a dielectric grating structure: Status report

Breuer

Hommelhoff

2013

AIP Conference Proceedings

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Section: Simulationsupporting

confidence: 54%

Acceleration of non-relativistic electrons at a dielectric grating structure: Status report

Breuer

Hommelhoff

2013

AIP Conference Proceedings

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“…Today's accelerators, which are based on metal structures driven by radio frequency fields, operate at acceleration gradients of ∼20-50 MeV/m. The upper limit in future radio frequency accelerators, such as the discussed CLIC and ILC, is ∼100 MeV/m, given by the damage threshold of the metal surfaces [1][2][3]. At optical frequencies dielectric materials withstand roughly two orders of magnitude larger field amplitudes than metals [4].…”

mentioning

confidence: 99%

Laser-Based Acceleration of Nonrelativistic Electrons at a Dielectric Structure

2013

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A proof-of-principle experiment demonstrating dielectric laser acceleration of non-relativistic electrons in the vicinity of a fused-silica grating is reported. The grating structure is utilized to generate an electromagnetic surface wave that travels synchronously with and efficiently imparts momentum on 28 keV electrons. We observe a maximum acceleration gradient of 25 MeV/m. We investigate in detail the parameter dependencies and find excellent agreement with numerical simulations. With the availability of compact and efficient fiber laser technology, these findings may pave the way towards an all-optical compact particle accelerator. This work also represents the demonstration of the inverse Smith-Purcell effect in the optical regime.The acceleration gradients of linear accelerators are limited by breakdown phenomena at the accelerating structures under the influence of large surface fields. Today's accelerators, which are based on metal structures driven by radio frequency fields, operate at acceleration gradients of ∼20-50 MeV/m. The upper limit in future radio frequency accelerators, such as the discussed CLIC and ILC, is ∼100 MeV/m, given by the damage threshold of the metal surfaces [1][2][3]. At optical frequencies dielectric materials withstand roughly two orders of magnitude larger field amplitudes than metals [4]. Together with the large optical field strength attainable with short laser pulses, dielectric laser accelerators (DLAs) hence may support acceleration gradients in the multi-GeV/m range [5]. With this technology lab-size accelerators, providing particle beams with energies currently only available at km-long facilities, seem feasible. Here we demonstrate the efficacy of the concept.Charged particle acceleration with oscillating fields requires an electromagnetic wave with a phase speed equal to the particle's velocity and an electric field component parallel to the particle's trajectory. So far, laserbased particle acceleration schemes employ the longitudinal electric field component of a plasma wave [6][7][8] or of a tightly focused laser beam [9], but in both schemes the accelerating mode has a phase velocity that does not match the speed of light. Therefore, relativistic particles can only be accelerated over short distances and the maximum attainable energies of these devices are limited. Exploiting the near-field of periodic structures, for example of optical gratings, offers the possibility to continuously accelerate non-relativistic as well as relativistic particles. In essence, the effect of the grating is to rectify the oscillating field in the frame co-moving with the electron, conceptually similar to conventional radio frequency devices. Single gratings can only be used to accelerate non-relativistic electrons, an effect also known as the inverse Smith-Purcell effect [10][11][12]. However, double grating structures, in which electrons propagate in a channel between two gratings facing each other, support a longitudinal, accelerating speed-of-light eigenmode that can be used to a...

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“…Typically cavities have a lower Q when operated at high field strength, so one should directly optimize the relevant quantity which is the energy stored inside. For example, the cavities originally designed for the TESLA accelerator [21,22] achieve QP em ∼ 10 10 × 10 W.…”

Section: Jinst 4 P11013mentioning

confidence: 99%

“…However, compared to optical frequencies (as proposed in [14,15]), building resonant and frequency stable cavities is a proven technology in the RF-frequency range. 3 Indeed, the cavities originally developed for the TESLA accelerator [22] may be mutually tuned in frequencies to a few × 100 Hz [23]. With a resonance frequency of roughly 1 GHz, this corresponds to an allowed quality factor of the detector cavity of Q ′ ∼ 10 6 .…”

Section: Jinst 4 P11013mentioning

confidence: 99%