Conveners
Sources: 1
- Masao Kuriki
Sources: 2
- Spencer Gessner (SLAC)
Sources: 3
- Steffen Doebert (CERN)
Sources: 4
- yoshinori enomoto (KEK)
Presentation materials
The CEPC Linac is a normal conducting S-band and C-band combined Linac providing electron and positron beams at an energy up to 30 GeV with 100 Hz repetition. The positron source of CEPC adopts a conventional scheme, electron beam energy on the target is 4GeV with a 10nC bunch charge. This talk will introduce the design of CEPC positron sources, including positron generation, capture,...
A baseline concept for a continuous wave (CW) polarized positron injector was developed for the Continuous Electron Beam Accelerator Facility (CEBAF) at Jefferson Lab (Ce+BAF) [1]. This concept is based on positron beam generation by a high current polarized electron beam (1 mA, 120 MeV, 90% polarization) irradiating a water-cooled, 4 mm thick rotating tungsten target or suitable alternative....
In the KEK Injector Linac, four-ring simultaneous injection has been achieved, and beam tuning is always performed in various beam modes. The beam tuning is complicated with many tuning knobs. We have developed an automatic tuning tool, which is realized by using Bayesian optimization and the downhill simplex method. It was especially useful in positron generation. I will report on the...
The proposal for a new generation high-luminosity electron-positron collider, the Super Tau-Charm Facility (STCF), has been put forward in China. The STCF is expected to achieve a luminosity greater than 0.5×1035 cm-2 s-1 and operate within a center-of-mass energy range of 2 to 7 GeV. Considering the design challenges of the STCF collider ring, swap-out injection has been suggested as one of...
We present designs and plans for a university-scale positron source that can deliver low-emittance beams for experiments [1]. The source is based on a Penning-Malmberg trap. We discuss positron generation and extraction, with specific focus on bunch manipulation at the exit of the trap. We describe some applications of positron beams from the trap.
[1] Compact source of positron beams with...
High power converter positron targets can be designed and assessed thermally with computational fluid dynamics (CFD). I will present the CFD assessments of a high power liquid Xenon (LXe) target and a rotating tungsten target with the ILC time structure for the beam.
Spin-polarized electron photoelectron sources are a critical component of multiple future collider designs. The present state-of-the-art polarized electron photocathode material, negative electron affinity gallium arsenide, has remarkable performance: it possesses high quantum efficiency and can emit beams with a spin polarization exceeding 90% under the right conditions. However, its extreme...
The presentation will report on recent CLIC positron source activities.
The focus will be on flux concentrator developments and beam loading calculations of the capture LINAC.
Present status and plan on E-driven positron source for ILC will be presented.
This talk might be a introduction to the several related topics by colleagues working on the project.
The International Linear Collider (ILC) represents the next generation of electron-positron colliders, designed to operate at center-of-mass energies ranging from 250 GeV, with plans to extend up to 1 TeV in the future. This opens up a broad spectrum of possibilities for exploring physics beyond the Standard Model. The ILC requires advanced engineering technology and meticulous design to...
Development of E-driven positron target.
We present the design of an APS cavity for the capture linac of the ILC E-driven positron source. It is required to accelerate a high-current multi-bunch positron beam in this positron source. Therefore, beam loading compensation and managing the heat load exceeding 10 kW due to electromagnetic showers generated at the target are important issues. We have designed a 21-cell APS accelerator,...
The CLIC positron source was simulated and optimised. A new baseline was proposed with a single amorphous tungsten target and a flux concentrator based matching device. Misalignments of the beamline are studied. Alternative scenarios with higher positron yields are also studied.
The beam produced in the target of the ILC positron source is highly divergent and therefore requires immediate optical matching, conventionally performed by some kind of solenoid arrangement.
Recently, the use of a plasma lens has been considered as an alternative with hopes to increase number of positrons available for the downstream acceleration. Previous simulations have indicated that a...
The quest for novel technologies in the ever-evolving landscape of scientific exploration has led to the investigation of plasma lensing as a potential solution for optical matching devices at positron sources. This research becomes increasingly significant as the need for higher data output demands innovative concepts to increase positron yield and therefore luminosity. Our initial...
The undulator-based positron source is baseline design for the ILC. Recent progress in particular on the undulator masc designs, optic matching devices (R&D for prototypes for pulsed solenoid, plasma lens) and on the target design (rotating wheel, material tests) are discussed. The adaption of an undulator-based positron source for the HALHF design as an upgrade option for the ILC is included as well.
We give a status report of prototyping a pulsed solenoid as an optic matching device for the undulator-based positron source of the ILC. In light of studies [1] and [2], we explore various design possibilities for the pulse solenoid coil. It is proposed to rotate the coil turns at an angle equal to the flare angle of the solenoid cone, which should improve the magnetic "looseness" of the coil...
Studies and R&D on the high-intensity positron source for the FCC-ee are ongoing as part of the FCC Feasibility Study. The current baseline design relies on a conventional positron production scheme. Recently, a feasibility study on using a superconducting (SC) solenoid for positron capture has begun, with a design based on High-Temperature Superconductor (HTS) technology currently adopted for...
