The Advanced Photon Source

Galayda, J.

doi:10.1109/pac.1995.504556

Cited by 23 publications

(15 citation statements)

References 20 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Besides that, intercept cooling is provided for all couplers at 80 K and at 5 K, and a 5 K cooling is also provided to the beamline flanges at the HOM absorber. Similar cooling requirements can be found at the LCLS-II cryomodule [2].…”

Section: Introductionsupporting

confidence: 55%

“…Some parameters are given by the mechanical layout (like @ and @ ), while others are fluid properties (3,2) and are usually taken from databases like HEPAK [7], based in the inlet parameters , @C and @C . For complex geometries or in situations where (because of the heat load ) and , (as a result of the pressure drop from the preceding piping) are not constant, pressure drops have to be calculated stepwise following eqn.…”

Section: Figure 1 Simplified Model Of a Parallel Flow Circuitmentioning

confidence: 99%

See 1 more Smart Citation

Cryogenic parallel, single phase flows: an analytical approach

Eichhorn

2017

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

Abstract. Managing the cryogenic flows inside a state-of-the-art accelerator cryomodule has become a demanding endeavour: In order to build highly efficient modules, all heat transfers are usually intercepted at various temperatures. For a multi-cavity module, operated at 1.8 K, this requires intercepts at 4 K and at 80 K at different locations with sometimes strongly varying heat loads which for simplicity reasons are operated in parallel. This contribution will describe an analytical approach, based on optimization theories.

show abstract

Section: Introductionsupporting

confidence: 55%

Section: Figure 1 Simplified Model Of a Parallel Flow Circuitmentioning

confidence: 99%

Cryogenic parallel, single phase flows: an analytical approach

Eichhorn

2017

IOP Conf. Ser.: Mater. Sci. Eng.

View full text Add to dashboard Cite

show abstract

“…Analysis of the results shows that the limitation is consistent with nucleation of flux penetration at defects in the rf layer. Superconducting radio frequency (srf) cavities are devices that transfer energy to charged particle beams in applications such as light sources [1,2], neutron sources [3,4], and colliders [5,6]. When rf power is applied to a cavity close to its resonant frequency, it builds up large electromagnetic fields.…”

mentioning

confidence: 99%

Radio Frequency Magnetic Field Limits of Nb andNb3Sn

2015

View full text Add to dashboard Cite

Superconducting radio frequency (srf) cavities, essential components of many large particle accelerators, rely on the metastable flux-free state of superconducting materials. In this Letter, we present results of experiments measuring the magnetic field limits of two srf materials, Nb and Nb 3 Sn. Resonators made using these materials were probed using both high power rf pulses and dc magnetic fields. Nb, which is the current standard material for srf cavities in applications, was found to be limited by the superheating field H sh when prepared using methods to avoid excessive rf dissipation at high fields. Nb 3 Sn, which is a promising alternative material that is still in the early stages of development for srf purposes, was found to be limited between the onset field of metastability H c1 and H sh . Analysis of the results shows that the limitation is consistent with nucleation of flux penetration at defects in the rf layer.

show abstract

“…The asymptote of the thin electron beam converges pretty slowly, and reasonable accuracy is achieved for very small values of the Fresnel number, N ≲ 0.01. To get the feeling about practical numbers, let us consider two working points of LCLS x-ray FEL operating at the radiation wavelength of 0.15 and 1.5 nm [16,27]. The transverse size of the electron beam is about 25 μm in both cases.…”

Section: A Radiation Of Modulated Electron Beammentioning

confidence: 99%

Optimization of a high efficiency free electron laser amplifier

Schneidmiller

Yurkov

2015

Phys. Rev. ST Accel. Beams

View full text Add to dashboard Cite

The free electron laser (FEL) amplifier is implemented in x-ray FEL facilities to generate short wavelength radiation. The problem of an efficiency increase of an FEL amplifier is now of great practical importance. The technique of undulator tapering in the postsaturation regime is used at the existing x-ray FELs LCLS, SACLA and FERMI, and is planned for use at FLASH, European XFEL, Swiss FEL, and PAL XFEL. There are also discussions on the future of high peak and average power FELs for scientific and industrial applications. In this paper we perform a detailed analysis of the tapering strategies for high power seeded FEL amplifiers. Analysis of the radiation properties from the modulated electron beam and application of similarity techniques allows us to derive the universal law of the undulator tapering.

show abstract

The Advanced Photon Source

Cited by 23 publications

References 20 publications

Cryogenic parallel, single phase flows: an analytical approach

Cryogenic parallel, single phase flows: an analytical approach

Radio Frequency Magnetic Field Limits of Nb andNb3Sn

Optimization of a high efficiency free electron laser amplifier

Contact Info

Product

Resources

About