Conveners
FCC-ee accelerator: Injector linacs
- Lenny Rivkin (EPFL)
FCC-ee accelerator: Machine design (1)
- Ralph Wolfgang Assmann (DESY)
FCC-ee accelerator: Machine design (2)
- Jie Gao (Institute of High Energy Physics, China)
FCC-ee accelerator: Injector design
- John Seeman (SLAC)
FCC-ee accelerator: Machine detector interface design (1)
- Maria Chamizo Llatas (Brookhaven National Laboratory (US))
FCC-ee accelerator: Machine detector interface design (2)
- Evgeny Levichev (Budker Institute of Nuclear Physics (RU))
The technical history of the SLAC/SLC 2-mile Linear Collider will be discussed including the concept, construction, accelerator physics advances, and the collider operation on the Z resonance.
PAL-XFEL is Korea’s first, and the world’s third, hard X-ray free-electron laser facility. PAL-XFEL is based on a 10-GeV S-band normal conducting linac consisting of 170 units of the 3-m long S-band accelerating structure, 46 units of the 80 MW S-band klystron, 41 units of S-band energy doubler, one X-band klystron, and three magnetic bunch compressor chicanes. A photo-cathode RF gun is used...
The Japanese XFEL (X-ray Free Electron Laser), SACLA adopts C-band normal conducting RF acceleration system as a main accelerator. The C-band system has constantly provided an acceleration gradient of about 40 MV/m since 2011 and it has accelerated electron beams up to 8.5 GeV at the maximum keeping sufficiently high stability of RF amplitude and phase required for high performance XFELs....
The SwissFEL 6 GeV electron Linac utilizes 104 C-band copper accelerating-structures of 2m length each. For series production of these structures PSI has developed together with industry a new production process. The key features of this process are on-tune ultra-precision machining and vacuum brazing of the full stack of cups together with the couplers in a single brazing step. This process...
The FCC-ee project studies the design of a future 100 km e+/e circular collider for precision studies and rare decay observations in the range of 90 to 350 GeV centre of mass energy with luminosities in the order of 10$^{35}$ cm$^{-2}$ s$^{-1}$. In order to reach these luminosity requirements, strong focusing is needed in the interaction regions. Large maximum beta values (of 7736 m for the...
In this talk an update of beam polarization expectations for energy calibration at FCCee is given.
I give an overview of our analytical and numerical work on the spin polarization in high-energy electron storage rings including progress since our ICAP18 contributions (see: https://bt.pa.msu.edu/ICAP18) and our IAS contribution (see: http://iasprogram.ust.hk/hep/2019/workshop-accelerator.php). We study the possibility of polarization for FCC-ee and CEPC. Our work is based on the so-called...
In this talk the collective effects for the FCC-ee with ttbar configuration will be presented. The resistive wall and RF cavity systems at 400 MHz and 800 MHz are taken into account for the short range wakefield in the longitudinal and transverse planes. The thresholds of the transverse mode coupling and microwave instabilities are evaluated and compared with the Z-pole configuration.
An X-ray interferometer was proposed for the apparent extremely small beam size measurement in the FCC-ee. The wavelength information is necessary to determine the beam size via interferometry. Certain monochrometer such as band-pass filter is used for identify the wavelength in ordinal interferometer using the visible SR. the K-edge filter is proposed as getting quasi monochromatic X-ray for...
Future Circular Electron Positron Collider FCC-ee will be the largest collider ever built. Although the operational availability of such machines has been high, the increased complexity of the new infrastructure can become a challenge. At the early stage of research, the main activity should be identifying the potential leading causes for downtime. This analysis can be done by studying...
SuperKEKB is an asymmetric circular e+e- collider operated with low emittance 3nm(x) and 10pm (y) and extremely low beta* 30mm(x) and 0.3mm(y). Beam-beam collision is executed 15 mrad in half angle and Piwinski angle is 26. In commssioning at 2019 summer, SuperKEKB is operated with the design emittance (~1% coupling) and bx=100-200mm by=3mm. Piwinski angle is 10. Luminosity performance is...
In this talk a preliminary overview of the collective effects for the FCC-ee booster will be presented. In particular we will give a first evaluation of the microwave instability threshold and discuss possible actions to eventually increase such a threshold. Finally, a plan for the future work on collective effects of this machine will be discussed.
Positron sources are critical components of the future linear (circular) collider projects. Due to the large 6D production emittance and important thermal load in the production target, the positron injector, in particular the positron source, is one of the key elements of the FCC-ee, requiring special attention. To ensure high reliability of the positron source, conventional and hybrid...
We present a modification of the Interaction Region beam pipe for dilution of the beam energy loss. This approach allows decreasing the diameter of the central beryllium pipe to 20 mm, as a request for further improvement of the Interaction Region and giving more freedom for the FCC detector. Additionally we discuss how additional IR elements like BPMs, bellows and flanges may influence on the...
