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| MOPLH06 |
Study of the Mean Transverse Energy and the Emission Mechanism of (N)UNCD Photocathodes |
181 |
| SUPLE12 |
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- G. Chen
IIT, Chicago, Illinois, USA
- G. Adhikari, W.A. Schroeder
UIC, Chicago, Illinois, USA
- S.P. Antipov, E. Gomez
Euclid TechLabs, LLC, Solon, Ohio, USA
- S.V. Baryshev, T. Nikhar
Michigan State University, East Lansing, Michigan, USA
- L.K. Spentzouris
Illinois Institute of Technology, Chicago, Illinois, USA
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Funding: This project is supported by NSF grant No. NSF-1739150, NSF-1535676, and NSF grant No. PHYS-1535279.
Nitrogen incorporated ultrananocrystalline diamond ((N)UNCD) is promising for photocathode applications due to its high quantum efficiency (QE). The mean transverse energy (MTE) which, along with QE, defines the brightness of the emitted electron beam must be thoroughly characterized and understood for (N)UNCD. Our previous work* further corroborated the important role of graphitic grain boundaries (GB’s). UNCD consists of diamond (sp3-hybrized) grains and graphitic (sp2-hybrized) GB’s: GB’s are behind the high emissivity of (N)UNCD and therefore play a crucial role in defining and controlling the MTE. In this work, the MTE of two different (N)UNCD samples having different ratios of sp3/sp2 were measured versus the primary photon energies. As a reference, MTE of highly oriented pyrolytic graphite (HOPG, canonical sp2-hybrized graphite) was also measured.
* G. Chen et al., Appl. Phys. Lett. 114, 093103 (2019).
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-NAPAC2019-MOPLH06
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| About • |
paper received ※ 27 August 2019 paper accepted ※ 12 September 2019 issue date ※ 08 October 2019 |
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| MOPLH16 |
Femtosecond Laser Microfabrication for Advanced Accelerator Applications |
207 |
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- S.P. Antipov, E. Dosov, E. Gomez, S.V. Kuzikov
Euclid TechLabs, LLC, Solon, Ohio, USA
- A.A. Vikharev
IAP/RAS, Nizhny Novgorod, Russia
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Funding: DOE SBIR
Femtosecond laser microfabrication allows for precise dimension control and reduced thermal stress of the machined materials. It can be applied to a wide range of materials from copper to diamond. Combined with secondary operations like polishing laser microfabrication can be utilized in various state of the art components required for AAC community. In this paper we will review several applications of laser microfabrication for Advanced Accelerator research and development. These will include wakefield structures (corrugated metal and dielectric loaded), plasma capillaries, x-ray refractive optics, high power laser optical components: mirrors, phase plates.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-NAPAC2019-MOPLH16
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| About • |
paper received ※ 28 August 2019 paper accepted ※ 31 August 2019 issue date ※ 08 October 2019 |
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| TUPLH07 |
High-Gradient Short Pulse Accelerating Structures |
500 |
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- S.V. Kuzikov, S.P. Antipov, E. Gomez
Euclid TechLabs, LLC, Solon, Ohio, USA
- A.A. Vikharev
IAP/RAS, Nizhny Novgorod, Russia
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High gradients are necessary for lots of applications of electron accelerators. As the maximum gradient is limited by effects of RF breakdown, we present a development of an electron accelerating structure operating with a short multi-megawatt RF pulse. The structure exploits an idea to decrease the breakdown probability due to RF pulse length reduction. This concept requires to distribute RF power so that all accelerating cells are fed independently each other. This implies waveguide net system which allows to delay and to distribute properly RF radiation along the structure keeping synchronism of particles and waves. We have designed an X-band pi-mode structure including the RF design, optimization, and engineering. The structure will be tested as an RF power extractor at the Argonne Wakefield Accelerator Facility for two-beam acceleration experiments. In this regime we anticipate to obtain 10 ns, gigawatt power level RF pulses generated by train consisted of eight 25-50 nC relativistic bunches.
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Poster TUPLH07 [0.999 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-NAPAC2019-TUPLH07
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| About • |
paper received ※ 27 August 2019 paper accepted ※ 31 August 2019 issue date ※ 08 October 2019 |
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| TUPLH08 |
X-Ray and Charged Particle Detection by Detuning of a Microwave Resonator |
503 |
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- S.P. Antipov, P.V. Avrakhov, E. Dosov, E. Gomez, S.V. Kuzikov
Euclid TechLabs, LLC, Solon, Ohio, USA
- S. Stoupin
Cornell University (CLASSE), Cornell Laboratory for Accelerator-Based Sciences and Education, Ithaca, New York, USA
- A.A. Vikharev
IAP/RAS, Nizhny Novgorod, Russia
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Funding: DOE SBIR
Charged particle detection is important for beam alignment, beam loss and background control. In case of halo detection, traditional wire scanner measurement utilizing carbon or tungsten wires is limited by the damage threshold of these materials. In this paper we present an electrodeless method to measure halo with a diamond scraper. This measurement utilizes a microwave resonator placed around the diamond scraper which is sensitive to charged particle-induced conductivity. Due to this transient induced conductivity in the dielectric, a microwave coupling to the resonator changes. Diamond in this case is chosen as a radiation hard material with excellent thermal properties. The absence of electrodes makes the device robust under the beam. The same measurement can be done for x-ray flux monitoring which is important for measurement feedback and calibration at modern x-ray light sources. In this case x-rays passing through the diamond sensing element enable a photo-induced conductivity and that in turn detunes the cavity placed around the diamond. Diamond being a low-Z material allows for in-line x-ray flux measurement without significant beam attenuation.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-NAPAC2019-TUPLH08
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| About • |
paper received ※ 28 August 2019 paper accepted ※ 05 September 2019 issue date ※ 08 October 2019 |
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| WEPLM21 |
High-Quality Resonators for Quantum Information Systems |
690 |
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- S.V. Kuzikov
IAP/RAS, Nizhny Novgorod, Russia
- S.P. Antipov, P.V. Avrakhov, E. Gomez
Euclid TechLabs, LLC, Solon, Ohio, USA
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We analyze ultra-high-quality factor resonators for quantum computer architectures. As qubit operation requires external DC fields, we started our study with a conventional closed copper cavity which naturally allows external magnetic field. In order to increase quality factor and to keep DC magnetic field control at a level less than critical field, an open SRF resonator promises much higher quality. The next step resonator is a photonic band gap (PBG) resonator. This resonator allows easy external either magnetic or electric field control. It consists of a periodic 3D set of sapphire rods assembled between two superconducting plates. The PBG resonator exploits unique properties of the crystalline sapphire. Tangent delta for sapphire in X-band is reported at 10-9 ’ 10-10 at 4 K. That is why, the Q-factor of the sapphire PBG resonator can be expected as high as 10 billions at mK temperatures which provides long relaxation times (dephasing etc.). The established PBG design implies obtaining a large Purcell factor, i.e. large ratio of quality to mode volume which is important parameter to establish strong interaction of a qubit with the cavity mode rather than RF noise.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-NAPAC2019-WEPLM21
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| About • |
paper received ※ 27 August 2019 paper accepted ※ 01 September 2019 issue date ※ 08 October 2019 |
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| WEPLO11 |
Single Cycle THz Acceleration Structures |
862 |
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- S.V. Kuzikov, A.A. Vikharev
IAP/RAS, Nizhny Novgorod, Russia
- S.P. Antipov, E. Gomez
Euclid TechLabs, LLC, Solon, Ohio, USA
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Funding: This work was supported by the Russian Science Foundation under grant 19-42-04133 in the part of CST simulations for THz structures.
Recently, gradients on the order of 1 GV/m level have been obtained in a form of single cycle (~1 ps) THz pulses produced by conversion of a high peak power laser radiation in nonlinear crystals (~1 mJ, 1 ps, up to 3% conversion efficiency). These pulses however are broadband (0.1-5 THz) and therefore a new accelerating structure type is required. For electron beam acceleration with such pulses we propose arrays of parabolic focusing micro-mirrors with common central. These novel structures could be produced by a femtosecond laser ablation system developed at Euclid Techlabs. This technology had already been tested for production of several millimeters long, multi-cell structure which has been testing with electron beam. We also propose using of structures where necessary GV/m E-fields are excited by a drive bunch travelling in the corrugated waveguide. The radiated by drive bunch sequence of short range delayed wakes are guided in this case by metallic disks and reflected back being focused exactly at time when the witness bunch arrives.
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Poster WEPLO11 [2.124 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-NAPAC2019-WEPLO11
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| About • |
paper received ※ 27 August 2019 paper accepted ※ 31 August 2019 issue date ※ 08 October 2019 |
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