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| WEPMY027 | Feasibility Study of Plasma Wakefield Acceleration at the CLARA Front End Facility | 2617 |
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Funding: Cockcroft Institute Core Grant and STFC Plasma wakefield acceleration has been proposed at the CLARA Front End (FE) facility at Daresbury Laboratory. The initial phase of the experiment will acceleration of the tail of a single electron bunch, and the follow-up experiment will study preserving a high quality beam based on a two-bunch acceleration scenario. In this paper, a concept for the initial experiment is outlined and detailed simulation results are presented. |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY027 | |
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| MOPMR039 | Review of Emittance Diagnostics for Space Charge Dominated Beams for AWAKE e- Injector | 337 |
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Funding: This work is supported by the Cockcroft Institute Core Grant and STFC. For a low energy, high intensity beam, total beam emittance is dominated by defocusing space charge force. This is most commonly observed in photo-injectors. In this low energy regime, emittance measurement techniques such as quadrupole scans fail as they consider the beam size only depends on optical functions. The pepper-pot method is used for 2D emittance measurements in a single shot manner. In order to measure the beam emittance in space charge dominated regime by quadrupole scans, space charge term should be carefully incorporated into the transfer matrices. On the other hand, methods such as divergence interferometry via optical transition radiation (OTRI), phase space tomography using 1D projections of quadrupole scans can be suitably applied for such conditions. In this paper, the design of a versatile pepper-pot system for AWAKE experiment at CERN is presented for a wide range of bunch charges from 0.1 to 1nC where the space charge force increases significantly. In addition, other aforementioned methods and respective algorithms are introduced as alternative methods. |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-MOPMR039 | |
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| TUPMY025 | Proton-Driven Electron Acceleration in Hollow Plasma | 1601 |
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Funding: President's Doctoral Scholar Award from The University of Manchester. Proton driven plasma wakefield acceleration has been proposed to accelerate electrons to TeV-scale in a single hundreds of meters plasma section. However, it is difficult to conserve beam quality due to the positively charged driven scheme. In this paper, we demonstrate via simulation that hollow plasma is favourable to maintain the long and stable acceleration and simultaneously be able to achieve low normalized emittance and energy spread of the witness electrons. Moreover, it has much higher beam loading tolerance compared to the uniform case. This will potentially facilitates the acceleration of a large number of particles with high beam quality. * Caldwell A et al.Nature Physics, 2009, 5(5): 363-367 ** K. Lotov, Phys. Rev. ST Accel. Beams, 2010, 13(4): 041301. *** W. Kimura et al., Phys. Rev. ST Accel. Beams, 2011, 14(4): 041301. |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-TUPMY025 | |
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| WEPMY025 | iMPACT, Undulator-Based Multi-Bunch Plasma Accelerator | 2609 |
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Funding: This work is supported by the Cockcroft Institute Core Grant and STFC. The accelerating gradient measured in laser or electron driven wakefield accelerators can be in the range of 10-100GV/m, which is 2-3 orders of magnitude larger than can be achieved by conventional RF-based particle accelerators. However, the beam quality preservation is still an important problem to be tackled to ensure the practicality of this technology. In this global picture, the main goals of this study are planning and coordinating a physics program, the so-called iMPACT, that addresses issues such as emittance growth mechanisms in the transverse and longitudinal planes through scattering from the plasma particles, minimisation of the energy spread and maximising the energy gain while benchmarking the milestones. In this paper, a summary and planning of the project is introduced and initial multi-bunch simulations were presented. |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY025 | |
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| WEPMY026 | A Gas-filled Capillary Based Plasma Source for Wakefield Experiments | 2613 |
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Funding: This work is supported by the University of Manchester Strategic Grant. A plasma medium can be formed when a gas is discharged via an applied high voltage within a capillary tube. A high voltage discharge based plasma source for plasma wake- field acceleration experiment is being developed. Design considered a glass capillary tube with various inner radii. Glass was preferred to sapphire or quartz options to ease the machining. Electrodes will be attached to the tube using a sealant resistant to high vacuum conditions and baking at high temperatures. Each electrode will be isolated from the neighbouring one using nuts or washers from a thermoplastic polymer insulator material to prevent unwanted sparking outside of the tube. In this paper, general design considerations and possible working points of this plasma source are presented for a range of plasma densities from 1×1020 to 1×1022 m−3. Consideration was also given to plasma density diagnostic techniques due to critical dependence of accelerating gradient on plasma density. |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-WEPMY026 | |
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| THPMB056 | Witness Beam Production with an RF Gun and a Travelling Wave Booster Linac for AWAKE Experiment at CERN | 3378 |
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Funding: This work is supported by the Cockcroft Institute Core Grant and STFC. AWAKE is a unique experiment that aims to demonstrate the proton driven plasma wakefield acceleration. In this experiment, proton bunches from the SPS accelerator will be injected into a 10m long pre-formed plasma section to form wakefields of hundreds MV/m to several GV/m. A second beam, e.g., the witness beam, will be injected after the protons in an appropriate phase to gain energy from the wakefields. A photo-injector will be utilised to deliver this second beam. It consists of an S-band RF gun followed by a meter long accelerating travelling wave structure (ATS). The RF gun was recuperated from existing PHIN photo-injector. A 3D RF design of the ATS was done by using the CST code and the field maps produced were used to characterise the electron beam dynamics under space charge effect by using the PARMELA code. The impact of the mechanical errors on the beam dynamics were investigated. |
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| DOI • | reference for this paper ※ DOI:10.18429/JACoW-IPAC2016-THPMB056 | |
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