High-energy photon source(HEPS) is a 6 GeV ultralow emittance storage ring light source to be built in Beijing, China. Both the horizontal and vertical beam sizes of the HEPS storage ring are below 10 lm. It is a chal...High-energy photon source(HEPS) is a 6 GeV ultralow emittance storage ring light source to be built in Beijing, China. Both the horizontal and vertical beam sizes of the HEPS storage ring are below 10 lm. It is a challenge to measure such a small beam size in both directions. To this end, measurement by a Kirkpatrick–Baez(KB) mirror imaging system was evaluated. A test KB system for the Shanghai Synchrotron Radiation Facility storage ring was designed and tested. Two crossed cylindrical mirrors were used to image the dipole source point. Both mirrors can be moved in and out so that the monitor is interchangeable with the original X-ray pinhole monitor. The aberration and point spread function, which would cause image blur, were evaluated. A beam-based calibration scheme was used by varying the beam size with different quadrupole settings and fitting them with the corresponding theoretical values.We updated the original X-ray camera with a new camera having a 5-lm-thick LuAG/Ce scintillator, and the imaging result shows greatly decreased image blur.展开更多
An X-ray pinhole camera has been used to determine the transverse beam size and emittance on the diagnostic beam line of the storage ring at SSRF since2009.The performance of the beam size measurement is determined by...An X-ray pinhole camera has been used to determine the transverse beam size and emittance on the diagnostic beam line of the storage ring at SSRF since2009.The performance of the beam size measurement is determined by the width of the point spread function of the X-ray pinhole camera.Beam-based calibration was carried in 2012 out by varying the beam size at the source point and measuring the image size.However,this calibration method requires special beam conditions.In order to overcome this limitation,the pinhole camera was upgraded and an X-ray quasi-monochromator was installed.A novel experimental method was introduced by combining the pinhole camera with the monochromator to calibrate the point spread function.The point spread function can be accurately resolved by adjusting the angle of the monochromator and measuring the image size.The X-ray spectrum can also be obtained.In this work,the X-ray quasi-monochromator and the novel beam-based calibration method will be presented in detail.展开更多
文摘High-energy photon source(HEPS) is a 6 GeV ultralow emittance storage ring light source to be built in Beijing, China. Both the horizontal and vertical beam sizes of the HEPS storage ring are below 10 lm. It is a challenge to measure such a small beam size in both directions. To this end, measurement by a Kirkpatrick–Baez(KB) mirror imaging system was evaluated. A test KB system for the Shanghai Synchrotron Radiation Facility storage ring was designed and tested. Two crossed cylindrical mirrors were used to image the dipole source point. Both mirrors can be moved in and out so that the monitor is interchangeable with the original X-ray pinhole monitor. The aberration and point spread function, which would cause image blur, were evaluated. A beam-based calibration scheme was used by varying the beam size with different quadrupole settings and fitting them with the corresponding theoretical values.We updated the original X-ray camera with a new camera having a 5-lm-thick LuAG/Ce scintillator, and the imaging result shows greatly decreased image blur.
基金supported by the National Science Foundation of China(No.11375255)
文摘An X-ray pinhole camera has been used to determine the transverse beam size and emittance on the diagnostic beam line of the storage ring at SSRF since2009.The performance of the beam size measurement is determined by the width of the point spread function of the X-ray pinhole camera.Beam-based calibration was carried in 2012 out by varying the beam size at the source point and measuring the image size.However,this calibration method requires special beam conditions.In order to overcome this limitation,the pinhole camera was upgraded and an X-ray quasi-monochromator was installed.A novel experimental method was introduced by combining the pinhole camera with the monochromator to calibrate the point spread function.The point spread function can be accurately resolved by adjusting the angle of the monochromator and measuring the image size.The X-ray spectrum can also be obtained.In this work,the X-ray quasi-monochromator and the novel beam-based calibration method will be presented in detail.
