Practical design and performance of a new merged APPLE-Knot undulator

2020 ◽  
Vol 27 (6) ◽  
pp. 1494-1498
Author(s):  
Fayuan Zhang ◽  
Zhipeng Sun ◽  
Yuxi Qiao ◽  
Shan Qiao
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Heat Load ◽  
Vacuum Ultraviolet ◽  
Polarization Mode ◽  
Shanghai Synchrotron Radiation Facility ◽  
Vertical Polarization ◽  
Electron Volt ◽  
Practical Design ◽  
And Performance

Constructing vacuum-ultraviolet beamlines at synchrotron radiation facilities with giga-electron volt storage ring results in serious heat load on the beamlines which can reduce their performance. To solve this problem, an APPLE-Knot undulator with eight magnet rows has been built at the Shanghai Synchrotron Radiation Facility and has achieved very good performance. However, its performance in vertical polarization mode is imperfect. Here, a new configuration of a magnet-merged APPLE-Knot undulator that has achieved a better performance is reported.

scholarly journals Diffraction-limited storage-ring vacuum technology

2014 ◽  
Vol 21 (5) ◽  
pp. 878-883 ◽  
Author(s):  
Eshraq Al-Dmour ◽  
Jonny Ahlback ◽  
Dieter Einfeld ◽  
Pedro Fernandes Tavares ◽  
Marek Grabski
Keyword(s):  
Thermal Conductivity ◽  
Synchrotron Radiation ◽  
Storage Ring ◽  
Heat Load ◽  
Storage Rings ◽  
Vacuum System ◽  
Vacuum Level ◽  
Vacuum Technology ◽  
And Performance ◽  
Compact Lattice

Some of the characteristics of recent ultralow-emittance storage-ring designs and possibly future diffraction-limited storage rings are a compact lattice combined with small magnet apertures. Such requirements present a challenge for the design and performance of the vacuum system. The vacuum system should provide the required vacuum pressure for machine operation and be able to handle the heat load from synchrotron radiation. Small magnet apertures result in the conductance of the chamber being low, and lumped pumps are ineffective. One way to provide the required vacuum level is by distributed pumping, which can be realised by the use of a non-evaporable getter (NEG) coating of the chamber walls. It may not be possible to use crotch absorbers to absorb the heat from the synchrotron radiation because an antechamber is difficult to realise with such a compact lattice. To solve this, the chamber walls can work as distributed absorbers if they are made of a material with good thermal conductivity, and distributed cooling is used at the location where the synchrotron radiation hits the wall. The vacuum system of the 3 GeV storage ring of MAX IV is used as an example of possible solutions for vacuum technologies for diffraction-limited storage rings.

scholarly journals Kinetics of 1- and 2-methylallyl + O2 reaction, investigated by photoionisation using synchrotron radiation

2021 ◽  
Author(s):  
Domenik Schleier ◽  
Engelbert Reusch ◽  
Marius Gerlach ◽  
Tobias Preitschopf ◽  
Deb Pratim Mukhopadhyay ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Reaction Kinetics ◽  
Molecular Oxygen ◽  
Light Source ◽  
Storage Ring ◽  
Vacuum Ultraviolet ◽  
Flow Tube ◽  
Tube Reactor ◽  
Swiss Light Source ◽  
Kinetics Of

The reaction kinetics of the isomers of the methylallyl radical with molecular oxygen has been studied in a flow tube reactor at the vacuum ultraviolet (VUV) beamline of the Swiss Light Source storage ring.

Orbit noise analysis in Shanghai Synchrotron Radiation Facility storage ring

2010 ◽  
Vol 22 (7) ◽  
pp. 1631-1634
Author(s):  
唐思巍 Tang Siwei ◽  
殷重先 Yin Chongxian ◽  
刘德康 Liu Dekang
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Noise Analysis ◽  
Shanghai Synchrotron Radiation Facility

Performance of the BL03U beamline at SSRF

2020 ◽  
Vol 27 (5) ◽  
pp. 1388-1394
Author(s):  
Z. P. Sun ◽  
Z. H. Liu ◽  
Z. T. Liu ◽  
W. L. Liu ◽  
F. Y. Zhang ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Energy Range ◽  
Photon Energy ◽  
Vacuum Ultraviolet ◽  
Resolving Power ◽  
Photon Energy Range ◽  
Photoemission Spectroscopy ◽  
Theoretical Estimation ◽  
Shanghai Synchrotron Radiation Facility ◽  
Angle Resolved Photoemission Spectroscopy

The vacuum ultraviolet beamline BL03U with a photon energy range from 7 eV upwards has been constructed at the 3.5 GeV Shanghai Synchrotron Radiation Facility. Equipped with an APPLE-Knot undulator, this beamline is dedicated to angle-resolved photoemission spectroscopy. An energy-resolving power of higher than 4.6 × 104 has been achieved in the photon energy range 21.6–48 eV, which is almost the same as the theoretical estimation.

scholarly journals Design and performance of the APPLE-Knot undulator

2015 ◽  
Vol 22 (4) ◽  
pp. 901-907 ◽  
Author(s):  
Fuhao Ji ◽  
Rui Chang ◽  
Qiaogen Zhou ◽  
Wei Zhang ◽  
Mao Ye ◽  
...  
Keyword(s):  
Synchrotron Radiation ◽  
Heat Load ◽  
Arbitrary Polarization ◽  
Optical Surfaces ◽  
Key Factor ◽  
Accelerator Technology ◽  
Slope Error ◽  
And Performance ◽  
Surface Distortions

Along with the development of accelerator technology, synchrotron emittance has continuously decreased. This results in increased brightness, but also causes a heavy heat load on beamline optics. Recently, optical surfaces with 0.1 nm micro-roughness and 0.05 µrad slope error (r.m.s.) have become commercially available and surface distortions due to heat load have become a key factor in determining beamline performance, and heat load has become a serious problem at modern synchrotron radiation facilities. Here, APPLE-Knot undulators which can generate photons with arbitrary polarization, with low on-axis heat load, are reported.

Betatron tune measurement system for Shanghai Synchrotron Radiation Facility storage ring

2010 ◽  
Vol 22 (10) ◽  
pp. 2412-2416 ◽  
Author(s):  
冷用斌 Leng Yongbin ◽  
阎映炳 Yan Yingbing ◽  
袁任贤 Yuan Renxian ◽  
周伟民 Zhou Weimin
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Measurement System ◽  
Shanghai Synchrotron Radiation Facility ◽  
Betatron Tune

A compact vacuum-ultraviolet beamline for synchrotron radiation photoelectron spectroscopy combined with an ion-scattering spectrometer, SORIS

1998 ◽  
Vol 5 (3) ◽  
pp. 557-558 ◽  
Author(s):  
Hidetoshi Namba ◽  
Makoto Obara ◽  
Daisuke Kawakami ◽  
Tomoaki Nishimura ◽  
Yonglian Yan ◽  
...  
Keyword(s):  
High Resolution ◽  
Synchrotron Radiation ◽  
Storage Ring ◽  
Photoelectron Spectroscopy ◽  
Vacuum Ultraviolet ◽  
Beam Size ◽  
Medium Energy ◽  
Ion Scattering ◽  
Atomic Structures ◽  
Medium Energy Ion Scattering

Apparatus for high-resolution synchrotron radiation photoelectron spectroscopy combined with high-resolution medium-energy ion scattering, named `SORIS', has been developed for simultaneous investigations of electronic states and atomic structures on surfaces. For this purpose, a compact vacuum-ultraviolet beamline of photon energy from 5 to 700 eV has been designed for the small storage ring `Aurora' installed at Ritsumeikan University. Owing to the small electron-beam size in the storage ring, an energy resolution E/dE of >5000 can be obtained.

Top-up safety simulation of injection beam for Shanghai Synchrotron Radiation Facility storage ring

2013 ◽  
Vol 25 (4) ◽  
pp. 985-988
Author(s):  
姜伯承 Jiang Bocheng ◽  
张满洲 Zhang Manzhou ◽  
李浩虎 Li Haohu ◽  
赵振堂 Zhao Zhentang
Keyword(s):  
Synchrotron Radiation ◽  
Storage Ring ◽  
Shanghai Synchrotron Radiation Facility
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