0428同步年報-2021-全

108 ACTIVITY REPORT 2021 solid-state drive and hard disk drive) storage system will be installed in early 2022. With over 1 Petabyte capacity, the expected storage time for the user data can be up to 30 days. An eight-node GP100 GPU cluster was also built for the high-speed reconstruction; this speed is just sufficient if the data comes in 2048 × 2048 × 720 in 1 minute. A reconstruction typically requires, however, more manual adjustment back and forth. A so-called real-time reconstruction for the continue data stream from the PXM endstation is not yet achievable. For the TXM endstation, with resolution up to 30 nm, the sample is expected to be as small as 20−30 μm or of flaky type. With the high resolution, the sphere of the confusion (SOC) of the nano-tomography is the key issue that determines the resolution in 3D. The wobble from the SOC was formally solved by manually alignment or semi-automatic alignment with markers. In this case, the alignment largely depends on the features of the sample or the contrast of the markers in the X-ray image. To solve this issue, four-axis laser interferometers, capacitive sensors and a flexure feedback system will be installed in the new TXM system to improve the SOC of nano-tomography. Beside this, for the experiment in situ , the working distance of this TXM is enlarged to 50 mm from 8−12 keV to provide more flexibility for the experiment in situ . Current Progress of Work on Site The work on site of this beamline began in early 2020, a few months before the arrival of the DCM/DMM. The DCM/ DMM system weighed over 12 tons, which is the heaviest monochromator system that has ever installed in the TPS. With three independent cranes and two independent cooling systems, this DCM/DMM is the most complicated system in control and operation, as shown in Fig. 4 . Moreover, 2020 is the time for the COVID-19 pandemic when business travel became difficult. It took nearly a half year to test and to install the DCM/DMM system by our staff with technical advice from Kohzu. In May 2021, the installation work of DCM/DMM was finished successfully and the rest of part of beamline began to be installed on site. During May and July 2021, as there was COVID-19 separation in Taiwan, the installation work was delayed. This beamline was able to be assembled, pumped and baked from August to October 2021. The interlock system and software was completed in late October. This beamline passed the internal test on October 25 and passed the inspection test of beamline safety on November 11. On the same day, the white beam passed through the endstation hutch, as shown in Fig. 5 . The gap of W100 is fully closed and the e-beam current of the TPS was 30 mA. The TPS was scheduled to shut down after the first test; the beamline Fig. 3 : 3D drawing of PXM endstation and sample exchange system. Fig. 4 : (left) Photograph of DCM/DMM after it was positioned at TPS 31A . (right) Photograph of DCM/DMM after the cover layer was taken down, showing the complicated structure of the DCM/DMM.