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Koshy A, Cailes B, Gow P, Testro A, Han H, Sajeev J, Ko J, Weinberg L, Srivastava P, Lim H, Teh A, Farouque O. Cardiac Output in End-Stage Liver Disease Increases Proportional to the Degree of Liver Dysfunction. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Koshy A, Gow P, Sajeev J, Cailes B, Ko J, Ramchand J, Lim H, Teh A, Han H, Jones R, Testro A, Byrne M, Clark D, Yudi M, Farouque O. Rise in Proportional Early Cardiovascular Mortality Following Liver Transplantation: Temporal Trends from the Australian & New Zealand Liver Transplant Registry. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Cailes B, Koshy A, Ko J, Han H, Lim H, Teh A, Weinberg L, Testro A, Gow P, Farouque O. Beta Blocker Use Increases The Risk of Perioperative Cardiac Events in Liver Transplant Patients. Heart Lung Circ 2019. [DOI: 10.1016/j.hlc.2019.06.355] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Ko J, Hemphill M, Yang Z, Sewell E, Na YJ, Sandsmark DK, Haber M, Fisher SA, Torre EA, Svane KC, Omelchenko A, Firestein BL, Diaz-Arrastia R, Kim J, Meaney DF, Issadore D. Diagnosis of traumatic brain injury using miRNA signatures in nanomagnetically isolated brain-derived extracellular vesicles. LAB ON A CHIP 2018; 18:3617-3630. [PMID: 30357245 PMCID: PMC6334845 DOI: 10.1039/c8lc00672e] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
The accurate diagnosis and clinical management of traumatic brain injury (TBI) is currently limited by the lack of accessible molecular biomarkers that reflect the pathophysiology of this heterogeneous disease. To address this challenge, we developed a microchip diagnostic that can characterize TBI more comprehensively using the RNA found in brain-derived extracellular vesicles (EVs). Our approach measures a panel of EV miRNAs, processed with machine learning algorithms to capture the state of the injured and recovering brain. Our diagnostic combines surface marker-specific nanomagnetic isolation of brain-derived EVs, biomarker discovery using RNA sequencing, and machine learning processing of the EV miRNA cargo to minimally invasively measure the state of TBI. We achieved an accuracy of 99% identifying the signature of injured vs. sham control mice using an independent blinded test set (N = 77), where the injured group consists of heterogeneous populations (injury intensity, elapsed time since injury) to model the variability present in clinical samples. Moreover, we successfully predicted the intensity of the injury, the elapsed time since injury, and the presence of a prior injury using independent blinded test sets (N = 82). We demonstrated the translatability in a blinded test set by identifying TBI patients from healthy controls (AUC = 0.9, N = 60). This approach, which can detect signatures of injury that persist across a variety of injury types and individual responses to injury, more accurately reflects the heterogeneity of human TBI injury and recovery than conventional diagnostics, opening new opportunities to improve treatment of traumatic brain injuries.
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Felthous AR, Ko J. Sexually Violent Predator Law in the United States. East Asian Arch Psychiatry 2018; 28:159-173. [PMID: 30563954] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Sexually violent predator (SVP) laws in the United States are controversial. They tend to be opposed by academics, libertarians, and professional organisations but are supported by states and the Supreme Court. This study reviews the history of SVP legislation, compares features of SVP laws among states, and summarise requirements by the Supreme Court that shaped these laws. Features of SVP laws include identification of sexual offenders with mental abnormality that predisposes them to sexually offending behaviours in the future, and standards of proof for conditional or unconditional release. A comprehensive understanding of all statutes can inform policymakers about SVP laws, whether supportive or restrictive of such legislation.
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Tan D, Kim SW, Sequist L, Ponce Aix S, Smit E, Hida T, Yang JH, Felip E, Seto T, Grohe C, Wolf J, Ko J, Marriere E, Belli R, Giovannini M, Kim DW. Phase II results for single-agent nazartinib (EGF816) in adult patients (pts) with treatment-naive EGFR-mutant non-small cell lung cancer (NSCLC). Ann Oncol 2018. [DOI: 10.1093/annonc/mdy424.073] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Karmouty-Quintana H, Molina JG, Philip K, Bellocchi C, Gudenkauf B, Wu M, Chen NY, Collum SD, Ko J, Agarwal SK, Assassi S, Zhong H, Blackburn MR, Weng T. The Antifibrotic Effect of A 2B Adenosine Receptor Antagonism in a Mouse Model of Dermal Fibrosis. Arthritis Rheumatol 2018; 70:1673-1684. [PMID: 29771006 PMCID: PMC10077881 DOI: 10.1002/art.40554] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2016] [Accepted: 05/08/2018] [Indexed: 12/14/2022]
Abstract
OBJECTIVE Systemic sclerosis (SSc; scleroderma) is a chronic disease that affects the skin and various internal organs. Dermal fibrosis is a major component of this disease. The mechanisms that promote dermal fibrosis remain elusive. Elevations in tissue adenosine levels and the subsequent engagement of the profibrotic A2B adenosine receptor (ADORA2B) have been shown to regulate fibrosis in multiple organs including the lung, kidney, and penis; however, the role of ADORA2B in dermal fibrosis has not been investigated. We undertook this study to test our hypothesis that elevated expression of ADORA2B in the skin drives the development of dermal fibrosis. METHODS We assessed the involvement of ADORA2B in the regulation of dermal fibrosis using a well-established mouse model of dermal fibrosis. Using an orally active ADORA2B antagonist, we demonstrated how inhibition of ADORA2B results in reduced dermal fibrosis in 2 distinct experimental models. Finally, using human dermal fibroblasts, we characterized the expression of adenosine receptors. RESULTS We demonstrated that levels of ADORA2B were significantly elevated in dermal fibrosis and that the therapeutic blockade of this receptor in vivo using an ADORA2B antagonist could reduce the production of profibrotic mediators in the skin and attenuate dermal fibrosis. Antagonism of ADORA2B resulted in reduced numbers of arginase-expressing macrophages and myofibroblasts and in reduced levels of the extracellular matrix proteins fibronectin, collagen, and hyaluronan. CONCLUSION These findings identify ADORA2B as a potential profibrotic regulator in dermal fibrosis and suggest that ADORA2B antagonism may be a useful approach for the treatment of SSc.
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Ko J, Lester B, Bowering G, Rugayan C, Ghement I, Aalok K. Risk of cancer associated death in younger vs older patients with FIGO stage I endometrial cancer. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy285.190] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Chung J, Ko J, Hahn SH, Kim HS, Wang SJ. Considerations of the q-profile control in KSTAR for advanced tokamak operation scenarios. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10D112. [PMID: 30399838 DOI: 10.1063/1.5035126] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2018] [Accepted: 06/08/2018] [Indexed: 06/08/2023]
Abstract
The q-profile control is essential for tokamaks exploring the advanced tokamak scenarios, which is expected to be able to provide a possible route toward a steady-state high performance operation in a fully non-inductive current drive state. This is because the pressure and current profiles must remain optimal for the scenario during the injection of large amounts of heating and current drive. Here, essential tools for the q-profile control are the motional Stark effect diagnostic for measuring the radial magnetic pitch angle profile and a state-of-the-art plasma control system. The pulse duration of the H-mode discharge at KSTAR has been extended year by year with improved control performance, and the experiment of internal transport barrier (ITB) formation in a weakly reversed q-profile with a marginal neutral beam injection majority heating successfully demonstrated that the ITB is an alternative candidate to achieve a high performance regime in KSTAR. These recent achievements are attributed to reliable profile measurement, which means that profile feedback control has become a necessary step to ensure a robust and reliable approach to advanced scenarios as the next step of research in KSTAR. In this paper, we discuss the technical and conceptual requirements for q-profile control according to the upgrade plan for heating and current drive systems in the coming years.
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Huang X, Liu DM, Liu C, Fu J, Wan BN, Lyu B, Wu ZW, Holcomb CT, Ko J, Rowan WL, Huang H, Miao GZ. Four-dimensional calibration turntable of the motional Stark effect diagnostic on EAST. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2018; 89:10B108. [PMID: 30399705 DOI: 10.1063/1.5036938] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2018] [Accepted: 07/11/2018] [Indexed: 06/08/2023]
Abstract
The motional Stark effect (MSE) diagnostic is applied to measure the safety factor q and current density profile of a tokamak device, which are important parameters in realizing the high-performance and long-pulse steady state of a tokamak. A single-channel MSE diagnostic based on dual photoelastic modulators, whose sightline meets with the neutral beam injection at a major radius of R = 2.12 m, has been built for the D window of the Experimental Advanced Superconducting Tokamak (EAST). According to the requirements of MSE diagnostic polarimetric calibration, a high-precision four-dimensional calibration turntable, driven by four stepping motors and controlled by software running on the computer, was designed for EAST. The turntable allows us to rapidly calibrate the MSE diagnostic in a series of positions and angles during EAST maintenance. The turntable can move in four dimensions of translation, yaw, pitch, and roll of the polarizer and can create linearly polarized light at any given angle with accuracy of ∼0.05° for the MSE system offline calibration. The experimental results of the MSE diagnostic calibration in the laboratory show that the turntable has the advantages of high positioning accuracy, flexible spatial movement, and convenient control and fully meets the calibration requirements of an MSE diagnosis system.
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Choi W, Eum J, Kim S, Bang S, Kim H, Kim Y, Lee D, Ko J, Kim J, Chang E, Lee W. Macrophage colony stimulating factor(M-CSF) and its receptor(M-CSFR) expression in the human luteinized granulose cells(GCS) is poitively correlated with IVF-ET pregnancy outcome. Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.892] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Kim S, Eum J, Choi W, Kwon S, Bang S, Kim M, Lee D, Ko J, Hwang J, Chang E, Lee W. Meiotic spindle position and second polar body orientation enable the prediction of embryonic developmental potential and embryo euploidy. Fertil Steril 2018. [DOI: 10.1016/j.fertnstert.2018.07.648] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Huang J, Weng T, Ko J, Chen NY, Xiang Y, Volcik K, Han L, Blackburn MR, Lu X. Suppression of cleavage factor Im 25 promotes the proliferation of lung cancer cells through alternative polyadenylation. Biochem Biophys Res Commun 2018; 503:856-862. [PMID: 29928883 DOI: 10.1016/j.bbrc.2018.06.087] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 06/17/2018] [Indexed: 10/28/2022]
Abstract
BACKGROUND Non-small cell lung cancer (NSCLC) is a life-threatening disease that has a poor prognosis and low survival rate. Cleavage factor Im 25 (CFIm25) is a RNA-binding protein that if down-regulated causes 3'UTR shortening and thus promotes the transcript stability of target genes. It is not clear whether CFIm25 and alternative polyadenylation (APA) play a role during cancer development. The purpose of this study is to explore the role of CFIm25 in lung cancer cell proliferation. METHODS CFIm25 was knocked down in A549 cells. Western blots were carried out to determine the protein expression of CFIm25, insulin growth factor 1 receptor (IGF1R), CyclinD1 (CCND1) and TP53. Real-time qRT PCR was performed to determine the total transcript levels of CFIm25 targets and the normalized fold changes in their distal PAS (dPAS) usage. Immunofluorescence was carried out to check the expression of CFIm25, IGF1R and CCND1. Cell proliferation over time was determined using the WST-1 reagent. RESULTS The transcript levels of CCND1 and GSK3β were significantly increased and the dPAS usage of several oncogenes (IGF1R, CCND1 and GSK3β) were decreased after CFIm25 knockdown. The protein level of IGF1R was increased, and we detected increased percentage of CCND1 positive cells and cell proliferation over time in CFIm25 knockdown cells. In addition, the mRNA and APA analysis of IGF1R using patient RNA-seq data from the Cancer Genome Atlas indicated that IGF1R is shortened in both lung adenocarcinoma and lung squamous cell carcinoma compared to normal controls. CONCLUSIONS Our findings suggest that CFIm25 plays an important role in lung cancer cell proliferation through regulating the APA of oncogenes, including IGF1R, and promoting their protein expression.
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Kang D, Choi C, Kim H, Park S, Kim S, Ryu D, Ko J, Lee J, Lee J, Lee K, Kwon B, Kim H, Nam H. Associated factors with overlooked multiple synchronous gastric epithelial neoplasia. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy151.068] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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65
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Kim S, Choi C, Kang D, Kim H, Park S, Ryu D, Ko J, Kim H, Kwon B, Lee K, Lee J, Lee J, Nam H. Clinical outcomes of endoscopic submucosal dissection for lesions on the proximal location of the stomach. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy151.067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Kang D, Kim H, Choi C, Park S, Kim S, Nam H, Ryu D, Ko J, Kim H, Kwon B, Lee K, Lee J, Lee J. Long-term clinical outcomes in large colorectal polyps with indefinite or positive resection margin after endoscopic resection. Ann Oncol 2018. [DOI: 10.1093/annonc/mdy151.228] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Bahl G, Pathak R, Sia M, Ko J, Tyldesley S. The Use of Chemotherapy Instead of Radiation Therapy Does Not Reduce the Incidence of Second Cancers in Survivors of Early Stage Seminoma: A Population-Based Study from British Columbia. Int J Radiat Oncol Biol Phys 2017. [DOI: 10.1016/j.ijrobp.2017.06.517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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Park B, Ko Y, Cheon D, Oh S, Ko J, Ro Y, Kim J. 172 Skin type analysis based on the new questionnaire in Korean women. J Invest Dermatol 2017. [DOI: 10.1016/j.jid.2017.07.482] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Choi Y, Lyu S, Park H, Park M, Lee S, Cho M, Ko J, Koh Y, Heo J, Park H, Kim J, Lee W. Differences in endometrial microbial composition correlate with implantation failure after IVF embryo transfer. Fertil Steril 2017. [DOI: 10.1016/j.fertnstert.2017.07.1087] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Jung L, Chae J, Kim I, Kim Y, Lee S, Lee S, Rhee K, Kim W, Ko J, Lee J. P784Can differential ventricular pacing be an alternative method when the para-hisian pacing is failed? Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx501.p784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Ko J, Lee S, Park J. RE-AUTHORING THE NARRATIVES OF THE OLDER CAREGIVING MOTHERS. Innov Aging 2017. [DOI: 10.1093/geroni/igx004.280] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Borgas D, Chambers E, Newton J, Ko J, Rivera S, Rounds S, Lu Q. Cigarette Smoke Disrupted Lung Endothelial Barrier Integrity and Increased Susceptibility to Acute Lung Injury via Histone Deacetylase 6. Am J Respir Cell Mol Biol 2017; 54:683-96. [PMID: 26452072 DOI: 10.1165/rcmb.2015-0149oc] [Citation(s) in RCA: 51] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
Abstract
Epidemiologic evidence indicates that cigarette smoke (CS) is associated with the development of acute lung injury (ALI). We have previously shown that brief CS exposure exacerbates lipopolysaccharide (LPS)-induced ALI in vivo and endothelial barrier dysfunction in vitro. In this study, we found that CS also exacerbated Pseudomonas-induced ALI in mice. We demonstrated that lung microvascular endothelial cells (ECs) isolated from mice exposed to CS had a greater permeability or incomplete recovery after challenges by LPS and thrombin. Histone deacetylase (HDAC) 6 deacetylates proteins essential for maintenance of endothelial barrier function. We found that HDAC6 phosphorylation at serine-22 was increased in lung tissues of mice exposed to CS and in lung ECs exposed to cigarette smoke extract (CSE). Inhibition of HDAC6 attenuated CSE-induced increases in EC permeability and CS priming of ALI. Similar barrier protection was provided by the microtubule stabilizer taxol, which preserved α-tubulin acetylation. CSE decreased α-tubulin acetylation and caused microtubule depolymerization. In coordination with increased HDAC6 phosphorylation, CSE inhibited Akt and activated glycogen synthase kinase (GSK)-3β; these effects were ameliorated by the antioxidant N-acetyl cysteine. Our results suggest that CS increases lung EC permeability, thereby enhancing susceptibility to ALI, likely through oxidative stress-induced Akt inactivation and subsequent GSK-3β activation. Activated GSK-3β may activate HDAC6 via phosphorylation of serine-22, leading to α-tubulin deacetylation and microtubule disassembly. Inhibition of HDAC6 may be a novel therapeutic option for ALI in cigarette smokers.
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Ko J, Chung J. Direct measurements of safety factor profiles with motional Stark effect for KSTAR tokamak discharges with internal transport barriers. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2017; 88:063505. [PMID: 28667969 DOI: 10.1063/1.4986461] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
The safety factor profile evolutions have been measured from the plasma discharges with the external current drive mechanism such as the multi-ion-source neutral beam injection for the Korea Superconducting Tokamak Advanced Research (KSTAR) for the first time. This measurement has been possible by the newly installed motional Stark effect (MSE) diagnostic system that utilizes the polarized Balmer-alpha emission from the energetic neutral deuterium atoms induced by the Stark effect under the Lorentz electric field. The 25-channel KSTAR MSE diagnostic is based on the conventional photoelastic modulator approach with the spatial and temporal resolutions less than 2 cm (for the most of the channels except 2 to 3 channels inside the magnetic axis) and about 10 ms, respectively. The strong Faraday rotation imposed on the optical elements in the diagnostic system is calibrated out from a separate and well-designed polarization measurement procedure using an in-vessel reference polarizer during the toroidal-field ramp-up phase before the plasma experiment starts. The combination of the non-inductive current drive during the ramp-up and shape control enables the formation of the internal transport barrier where the pitch angle profiles indicate flat or slightly hollow profiles in the safety factor.
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Gallo LH, Ko J, Donoghue DJ. The importance of regulatory ubiquitination in cancer and metastasis. Cell Cycle 2017; 16:634-648. [PMID: 28166483 PMCID: PMC5397262 DOI: 10.1080/15384101.2017.1288326] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2016] [Revised: 01/20/2017] [Accepted: 01/24/2017] [Indexed: 12/26/2022] Open
Abstract
Ubiquitination serves as a degradation mechanism of proteins, but is involved in additional cellular processes such as activation of NFκB inflammatory response and DNA damage repair. We highlight the E2 ubiquitin conjugating enzymes, E3 ubiquitin ligases and Deubiquitinases that support the metastasis of a plethora of cancers. E3 ubiquitin ligases also modulate pluripotent cancer stem cells attributed to chemotherapy resistance. We further describe mutations in E3 ubiquitin ligases that support tumor proliferation and adaptation to hypoxia. Thus, this review describes how tumors exploit members of the vast ubiquitin signaling pathways to support aberrant oncogenic signaling for survival and metastasis.
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Chung J, Ko J, Wi H, Messmer M, Schenkelaars S, Scheffer M, Jaspers RJE. Initial operation of a newly developed multichord motional Stark effect diagnostic in KSTAR. THE REVIEW OF SCIENTIFIC INSTRUMENTS 2016; 87:11E503. [PMID: 27910319 DOI: 10.1063/1.4955483] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
A photo-elastic modulator based 25-chord motional Stark effect (MSE) diagnostic has been successfully developed and commissioned in Korea Superconducting Tokamak Advanced Research. The diagnostic measures the radial magnetic pitch angle profile of the Stark splitting of a D-alpha line at 656.1 nm by the electric field associated with the neutral deuterium heating beam. A tangential view of the neutral beam provides a good spatial resolution of 1-3 cm for covering the major radius from 1.74 m to 2.28 m, and the time resolution is achieved at 10 ms. An in-vessel calibration before the vacuum closing as well as an in situ calibration during the tokamak operation was performed by means of specially designed polarized lighting sources. In this work, we present the final design of the installed MSE diagnostic and the first results of the commissioning.
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