BEGIN:VCALENDAR VERSION:2.0 PRODID:-//CERN//INDICO//EN BEGIN:VEVENT SUMMARY:On-line bunch-by-bunch position and synchrotron phase monitoring a nd its study at the Taiwan Photon Source DTSTART;VALUE=DATE-TIME:20240417T034000Z DTEND;VALUE=DATE-TIME:20240417T040000Z DTSTAMP;VALUE=DATE-TIME:20260907T001910Z UID:indico-contribution-436-167@indico.nsrrc.org.tw DESCRIPTION:Speakers: Chih-Hsien Huang (NSRRC)\nThe online bunch-by-bunch position and phase monitor has been established by employing a high-speed analog-to-digital converter\, meticulously synchronized with the accelerat or's radio frequency. I/Q demodulation is utilized in the phase monitor to calculate the beam phase. To unravel the intricacies of bunch motion\, in dependent component analysis has been employed\, efficiently segregating t he bunch motion into discrete sources. The resulting bunch motion is a dir ect outcome of the linear combination of these distinct sources\, signific antly simplifying the overarching data analysis procedure. An examination of the tune variation in these sources is conducted through a numerical an alysis of fundamental frequencies. These monitors are used to study the bu nch motion during injection\, transient beam loading effects at various be am currents\, and synchronous motion during routine operation.\n\nhttps:// indico.nsrrc.org.tw/event/16/contributions/167/ LOCATION:Research Building A119 URL:https://indico.nsrrc.org.tw/event/16/contributions/167/ END:VEVENT BEGIN:VEVENT SUMMARY:Overview of Korea 4GSR project DTSTART;VALUE=DATE-TIME:20240417T063000Z DTEND;VALUE=DATE-TIME:20240417T065000Z DTSTAMP;VALUE=DATE-TIME:20260907T001910Z UID:indico-contribution-436-190@indico.nsrrc.org.tw DESCRIPTION:Speakers: Sung-Ju Park (Pohang Accelerator Laboratory)\nA 4th Generation Light Source is being built in Ochang\, Korea (Korea-4GSR proje ct). It can produce synchrotron light that is 100 to 1000 times brighter t han that of the 3rd generation source like PLS-II in the Pohang Accelerato r Laboratory (PAL). The Korea-4GSR is designed to have a circumference of 800 meters to implement a Diffraction-Limited storage ring. This size is t hree times that of PLS-II\, requiring significantly smaller magnet and vac uum chamber apertures for stronger focusing\, and the size of the electron beam also reduces by more than tenfold\, making the physical/engineering design of the accelerator and the control and stability of the electron/ph oton beams very challenging. Fully utilizing PAL's experiences gained duri ng the construction and operation of the PLS-II and the PAL-XFEL (a 10-GeV X-ray Free Electron Laser)\, we have completed the physics design of Kore a-4GSR\, and the engineering design is now in its final stages\, bringing the successful construction of Korea-4GSR closer. Furthermore\, through ac tive exchanges with overseas accelerator laboratories\, we are trying to s trengthen human networks and secure the latest design\, testing\, and manu facturing techniques.\n\nhttps://indico.nsrrc.org.tw/event/16/contribution s/190/ LOCATION:Research Building A119 URL:https://indico.nsrrc.org.tw/event/16/contributions/190/ END:VEVENT BEGIN:VEVENT SUMMARY:Measurement of the yields of photon stimulated desorption and phot oelectrons at a PSD-beamline DTSTART;VALUE=DATE-TIME:20240417T080000Z DTEND;VALUE=DATE-TIME:20240417T082000Z DTSTAMP;VALUE=DATE-TIME:20260907T001910Z UID:indico-contribution-436-191@indico.nsrrc.org.tw DESCRIPTION:Speakers: Gao-Yu Hsiung (NSRRC)\nSynchrotron radiation induced high yields of gas-desorption and photoelectrons from the vacuum beam duc ts of large accelerators results in huge impacts of shortening the beam li fetime and beam instabilities from the trapped ions or electron cloud. Ins pection of surface cleanness and coated materials on top surface layers of beam ducts by directly measuring the photon stimulated desorption (PSD) a nd photoelectron yield (PEY) at a beamline of synchrotron light source pro vides a quick and sensitive analysis of surface qualities of cleanness. A PSD-beamline BL19B of 1.5 GeV Taiwan Light Source (TLS) features a prompt measurement of PSD-yield and PEY for various vacuum tubes\, e.g. titanium\ , stainless steel\, copper\, aluminum alloys\, and the NEG-coated chambers \, will be described in this presentation.\n\nhttps://indico.nsrrc.org.tw/ event/16/contributions/191/ LOCATION:Research Building A119 URL:https://indico.nsrrc.org.tw/event/16/contributions/191/ END:VEVENT BEGIN:VEVENT SUMMARY:Preliminary lattice design for Australian Synchrotron 2.0 DTSTART;VALUE=DATE-TIME:20240417T032000Z DTEND;VALUE=DATE-TIME:20240417T034000Z DTSTAMP;VALUE=DATE-TIME:20260907T001910Z UID:indico-contribution-436-173@indico.nsrrc.org.tw DESCRIPTION:Speakers: Xuanhao Zhang (Australian Synchrotron)\nA new projec t is underway to develop the successor to the current Australian Synchrotr on. The new storage ring is proposed to be 450 m in circumference operatin g at 3 GeV. A preliminary 7BA lattice has been designed which utilises the higher-order achromat (HOA) scheme to suppress strong sextupole driving t erms. The lattice has 24 sectors and a natural horizontal emittance of 50 pm-rad. This is achieved using a combination of strong combined function m agnets and reverse bending magnets in the unit cell\, as well as careful t uning of the bending angles to preserve positive momentum compaction facto r. The dynamic aperture\, momentum aperture and Touschek lifetime have bee n optimised by tuning the linear optics and sextupole strengths with a mul ti-objective genetic algorithm.\n\nhttps://indico.nsrrc.org.tw/event/16/co ntributions/173/ LOCATION:Research Building A119 URL:https://indico.nsrrc.org.tw/event/16/contributions/173/ END:VEVENT BEGIN:VEVENT SUMMARY:Laser-Compton X-ray generation stabilization at KEK LUCX facility by Digital LLRF phase&litude feedforward implementation into RF system DTSTART;VALUE=DATE-TIME:20240417T040000Z DTEND;VALUE=DATE-TIME:20240417T042000Z DTSTAMP;VALUE=DATE-TIME:20260907T001910Z UID:indico-contribution-436-171@indico.nsrrc.org.tw DESCRIPTION:Speakers: KONSTANTIN POPOV (High Energy Accelerator Research O rganization (KEK))\nKEK LUCX facility is a normal conductive multi-bunch e lectron linear\naccelerator devoted to develop an intense monochromatic so urce of laser-Compton\nX-ray for monochromatic X-Ray imaging. In order to perform samples\ntomography\, stable laser-Compton X-ray beam is necessary . From accelerator side\,\nlaser-Compton X-ray generation stability is bas ically defined by electron beam\nparameters stability\, while these parame ters depend on accelerating field phase and\namplitude. Therefore\, the st abilization of accelerating field is a milestone to\ngenerate stable X-ray . Digital LLRF phase and amplitude feedforward system was\ndeveloped\, tes ted and implemented into KEK LUCX facility RF system for the\naccelerating field precise control.\nThis research presents results of electron beam p arameters stabilization at\nKEK LUCX facility. These parameters are beam a verage energy\, energy spread\n(RMS)\, bunch charge\, beam arrival time\, transverse normalized emittance. Also\,\nDigital LLRF feedforward system t echnical details are explained.\n\nhttps://indico.nsrrc.org.tw/event/16/co ntributions/171/ LOCATION:Research Building A119 URL:https://indico.nsrrc.org.tw/event/16/contributions/171/ END:VEVENT BEGIN:VEVENT SUMMARY:Present status of an infrared free-electron laser facility at Chia ng Mai University DTSTART;VALUE=DATE-TIME:20240417T065000Z DTEND;VALUE=DATE-TIME:20240417T071000Z DTSTAMP;VALUE=DATE-TIME:20260907T001910Z UID:indico-contribution-436-256@indico.nsrrc.org.tw DESCRIPTION:Speakers: Sakhorn Rimjaem (Chiang Mai University)\nA project t o develop a linac-based MIR/THz free-electron laser (FEL) light source and experimental stations for spectroscopic and ultrafast interaction applica tions is underway at Chiang Mai University in Thailand. The accelerator sy stem serving as the electron beam injector is an existing system\, albeit with modifications to accommodate two newly developed beamlines for MIR/TH z FEL. Engineering design and construction of new components in magnetic b unch compressors and FEL beamlines\, have been conducted based on physics design and beam dynamic simulations. Currently\, nearly all components hav e been installed in the accelerator hall\, and the commissioning of the sy stem is in progress. This contribution provides an overview of the project \, a report and a discussion of the design and beam dynamic simulations f or both the oscillator MIR FEL and the super-radiant THz FEL as well as th e development of components. Furthermore\, the current status of the facil ity will also be presented.\n\nhttps://indico.nsrrc.org.tw/event/16/contri butions/256/ LOCATION:Research Building A119 URL:https://indico.nsrrc.org.tw/event/16/contributions/256/ END:VEVENT BEGIN:VEVENT SUMMARY:New beam loss monitor system at the Australian Synchrotron DTSTART;VALUE=DATE-TIME:20240417T055000Z DTEND;VALUE=DATE-TIME:20240417T061000Z DTSTAMP;VALUE=DATE-TIME:20260907T001910Z UID:indico-contribution-436-188@indico.nsrrc.org.tw DESCRIPTION:Speakers: Xuanhao Zhang (Australian Synchrotron)\nA new beam l oss monitor (BLM) system has been installed and commissioned at the Austra lian Synchrotron. The new system consists of 28 beam loss detector (BLD) u nits and 14 signal processing BLM units distributed around the storage rin g. Each detector unit consists of a plastic scintillator coupled to a phot omultiplier tube. The signal processing units are Libera BLMs from Instrum entation Technology. The new system can detect both integrated slow losses from the stored beam and turn-by-turn losses during injection. This talk will describe the calibration method\, the commissioning results\, and imp lementation of a postmortem function to detect unexpected beam loss events .\n\nhttps://indico.nsrrc.org.tw/event/16/contributions/188/ LOCATION:Research Building A119 URL:https://indico.nsrrc.org.tw/event/16/contributions/188/ END:VEVENT BEGIN:VEVENT SUMMARY:Commissioning optics for low emittance rings DTSTART;VALUE=DATE-TIME:20240417T061000Z DTEND;VALUE=DATE-TIME:20240417T063000Z DTSTAMP;VALUE=DATE-TIME:20260907T001910Z UID:indico-contribution-436-189@indico.nsrrc.org.tw DESCRIPTION:Speakers: Tessa Charles (Australian Synchrotron\, ANSTO)\nThe strive towards lower emittance in 4th generation light sources often restr icts the dynamic aperture and lifetime\, creating challenges for injection efficiency and commissioning. Once a circulating beam is established\, BP M calibration\, BBA and other optics corrections can be applied. However\, with a limited DA\, it can be difficult to establish a circulating beam a t the start of commissioning. To address this problem\, we have developed a lattice design that allows for both low emittance optics (for standard u ser beam operation) and what we have called “commissioning optics” whi ch is a set of lattice parameters that allows for larger dynamic aperture and Touschek Lifetime at the temporary cost of larger horizontal emittance .\n\nhttps://indico.nsrrc.org.tw/event/16/contributions/189/ LOCATION:Research Building A119 URL:https://indico.nsrrc.org.tw/event/16/contributions/189/ END:VEVENT BEGIN:VEVENT SUMMARY:Resonant Cherenkov diffraction radiation for the beam diagnostics DTSTART;VALUE=DATE-TIME:20240417T082000Z DTEND;VALUE=DATE-TIME:20240417T084000Z DTSTAMP;VALUE=DATE-TIME:20260907T001910Z UID:indico-contribution-436-193@indico.nsrrc.org.tw DESCRIPTION:Speakers: Hiroyuki Hama (Tohoku University)\nWe have developed a periodic Cherenkov radiator to obtain narrow band Cherenkov radiation. Since the radiation spectrum of Cherenkov diffraction radiation from the r adiator contains strong higher order harmonics\, the bunch form factor of the electron beam is expected to be deduced precisely\, so that the very s hort bunch less than 10 fs (such as the laser wakefield accelerated beam) is able to be measured. We have done some test experiments with 100 fs bun ches at t-ACTS of Tohoku University. Some theoretical consideration and ex periments data together with discussions will be presented.\n\nhttps://ind ico.nsrrc.org.tw/event/16/contributions/193/ LOCATION:Research Building A119 URL:https://indico.nsrrc.org.tw/event/16/contributions/193/ END:VEVENT BEGIN:VEVENT SUMMARY:Evaluation of the wakefield effects caused by the orbit fluctuatio n on the nanometer small beam at ATF DTSTART;VALUE=DATE-TIME:20240417T053000Z DTEND;VALUE=DATE-TIME:20240417T055000Z DTSTAMP;VALUE=DATE-TIME:20260907T001910Z UID:indico-contribution-436-192@indico.nsrrc.org.tw DESCRIPTION:Speakers: Yuki Abe (KEK)\nFor demonstrating the beam focusing scheme required for linear colliders\, the Accelerator Test Facility (ATF) at KEK is designed to focus an electron beam to 37 nm vertical size at th e virtual interaction point (IP) utilizing the low emittance beam (vertica l emittance: 12~pm.rad) generated in the damping ring. Because of the spec ial focusing beam optics\, even small angle changes of beam particles in t he beamline can cause significant distortions at IP. The transverse wakefi eld effects have been observed as beam size growth depending on the beam i ntensity at ATF. In this report\, we describe the wakefield affection on t he beam size at IP with pulse-by-pulse beam orbit fluctuations. Simulation and experiments in the final focus beam line of ATF\, which have confirme d the effect\, are also reported.\n\nhttps://indico.nsrrc.org.tw/event/16/ contributions/192/ LOCATION:Research Building A119 URL:https://indico.nsrrc.org.tw/event/16/contributions/192/ END:VEVENT END:VCALENDAR