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Taiwan Photon Source Exceeds the Design Goal of 500 mA Stored Current

Friday, December 18, 2015

In the afternoon of December 12, 2015, the 3 GeV Taiwan Photon Source (TPS) of the National Synchrotron Radiation Research Center (NSRRC) stored 520 mA of electron current in its storage ring and gave the world a bright synchrotron light as the “International Year of Light 2015” comes to an end. This is the second phase of commissioning conducted after the 5-month upgrade work set for bringing the electron current to its design value of 500 mA. In the first phase of commissioning, 100 mA stored current was achieved in March 2015 by using two room-temperature 5-cell PETRA radio frequency (RF) cavities.

TPS stored current reached 520 mA on December 12, 2015

Starting in the second quarter of 2015, two superconducting RF (SRF) modules and ten insertion devices (IDs) were installed in the TPS storage ring. Seven out of ten IDs are in-vacuum undulators (IUs) and the remaining are elliptically polarized undulators (EPUs). Two 500-MHz KEKB-type SRF cavities were installed in the storage ring in early April to replace the PETRA cavities. In preparation of operating the SRF, the cryogenic plant needs to be in place and function. The acceptance test of the cryogenic plant was completed in February and a cryogenic dummy load was used to mimic the requirements of SRF modules in May, therefore, leading to the early completion of the integration and test of the SRF system in July. Meanwhile, the 610-meter long liquid nitrogen transfer system to serve 24 ID beamlines was installed and commissioned in October. The magnets of the transfer lines from linac to booster (LTB) and from booster to storage ring (BTS) were upgraded to improve the injection efficiency and reliability. Ninety-six pieces of fast feedback corrector magnets were placed at both ends of the straight sections as well as upstream of dipole magnets.

NSRRC celebrated the completion of TPS commissioning

After the indiscernible vacuum problem being solved at the end of November, the commissioning of TPS took a smooth ride ramping from 0 to 520 mA in 11 minutes on December 12. It takes NSRRC less than five years progressing from the ground breaking ceremony in February 2010 to the first photon beam and 5 mA stored current achieved in December 2014. Thanks to the high performance of the SRF system, the stored current is able to increase 100 times and exceeds the design goal in less than one year.

While the TPS ramping up to its target value of stored current, two beamlines, the protein microcrystallography beamline (TPS-05) and the temporally coherent X-ray diffraction beamline (TPS-09), were in commissioning. Up to now, TPS-05 has delivered monochromatic X-rays with beam sizes of few tens microns and obtained experimental data; X-rays from two collinear IUs installed in the same 12-meter straight section with double mini-βy lattice have been monochromatized and transported to the 8-circle diffractometer at the TPS-09 beamline. A total of seven TPS beamlines will be opened for user operation in 2016.

National Synchrotron Radiation Research Center (NSRRC) is a research institution funded by the government of Taiwan and operates two synchrotron accelerators. The 1.5 GeV Taiwan Light Source (TLS) shined its first light in April 1993 and now has 25 beamlines in operation. The 3 GeV Taiwan Photon Source (TPS) delivered its first photon beam in December 2014 and is scheduled to have 7 beamlines open to general users in 2016. The NSRRC is the sole synchrotron-based light source provider in Taiwan to facilitate research in physics, chemistry, materials, biology, medicine, advanced technology and scientific applications. The NSRRC supported over 2000 users and hosted nearly 1600 experimental runs in year 2014 with over 12% attributed by international research teams from 20 countries. The mission of NSRRC is to serve researchers and academic scholars in conducting scientific experiments and to promote the accelerator-based technologies and experimental techniques to the undergraduate and graduate students.