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RISS 인기검색어
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- 저자 : Hiroyuki Ao (검색결과 2 건)
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High-power Test of Annular-ring Coupled Structures for the J-PARC Linac Energy Upgrade
Jun Tamura,Hiroyuki Ao,Yasuo Nemoto,Hiroyuki Asano,Takahiro Suzuki 한국물리학회 2015 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.66 No.3
Annular-ring coupled structures (ACSs) will increase the beam energy of the Japan proton acceleratorresearch complex (J-PARC) linac from 181 to 400 MeV to achieve a beam power of 1MW for a materials and life science experimental facility. The mass production of the ACS cavitiescommenced in March 2009. Before the installation, all cavities require power testing. High-powertesting is essential not only for confirming the cavity’s design performance but also for preventingdelays in cavity conditioning schedule. However, the 2011 Tohoku earthquake damaged J-PARCfacilities, including the ACS power-test area, and cavity conditioning was interrupted for two years. After the facility’s restoration, two ACS cavities (M01 and M11) were conditioned. They performed15 − 20% above the designed accelerating field of 4.2 MV/m. As M01 was initially conditioned sixyears ago, the most recent conditioning time required for M01 was drastically reduced. From thisresult, we confirmed that long-term stored ACS cavities purged with nitrogen gas do not producecritical cavity performance issues. During high-power operation of M11, which is a unique cavityequipped with a capacitive iris in a waveguide, no significant increases in the temperature and thedischarge rate around the capacitive iris were observed. Even considering beam loss due to residualgas scattering, the vacuum pressure was sufficiently low (4 × 10−6 Pa). More stable operation canbe expected following a month-long conditioning process before the beam is commissioned. M11’sconditioning successfully demonstrated an auto-conditioning program, and we established the conditioningscheme using this auto-conditioning program for all ACS cavities in a limited time andwith limited manpower.
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Hirotaka Hasegawa,Masahiro Shin,Jun Kawagishi,Hidefumi Jokura,Toshinori Hasegawa,Takenori Kato,Mariko Kawashima,Yuki Shinya,Hiroyuki Kenai,Takuya Kawabe,Manabu Sato,Toru Serizawa,Osamu Nagano,Kyoko Ao 대한뇌졸중학회 2022 Journal of stroke Vol.24 No.2
Background and Purpose To assess the long-term outcomes of intracranial dural arteriovenous fistula (DAVF) treated with stereotactic radiosurgery (SRS) alone or embolization and SRS (Emb- SRS) and to develop a grading system for predicting DAVF obliteration. Methods This multi-institutional retrospective study included 200 patients with DAVF treated with SRS or Emb-SRS. We investigated the long-term obliteration rate and obliteration-associated factors. We developed a new grading system to estimate the obliteration rate. Additionally, we compared the outcomes of SRS and Emb-SRS by using propensity score matching. Results The 3- and 4-year obliteration rates were 66.3% and 78.8%, respectively. The post-SRS hemorrhage rate was 2%. In the matched cohort, the SRS and Emb-SRS groups did not differ in the rates of obliteration (P=0.54) or post-SRS hemorrhage (P=0.50). In multivariable analysis, DAVF location and cortical venous reflux (CVR) were independently associated with obliteration. The new grading system assigned 2, 1, and 0 points to DAVFs in the anterior skull base or middle fossa, DAVFs with CVR or DAVFs in the superior sagittal sinus or tentorium, and DAVFs without these factors, respectively. Using the total points, patients were stratified into the highest (0 points), intermediate (1 point), or lowest (≥2 points) obliteration rate groups that exhibited 4-year obliteration rates of 94.4%, 71.3%, and 60.4%, respectively (P<0.01). Conclusions SRS-based therapy achieved DAVF obliteration in more than three-quarters of the patients at 4 years of age. Our grading system can stratify the obliteration rate and may guide physicians in treatment selection.
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