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Using exact geometrical solutions and dipolar lattice sums, we analyze how the cohesive energy depends on the cylinder diameter. In the zigzag regime, the cohesion exhibits a pronounced nonmonotonic behavior that can be rationalized in terms of competing radial and longitudinal pressures arising from a breaking of ideal head-to-tail dipolar alignment. This competition leads to a point of weakest cohesion, followed by a stabilization of the densest zigzag structure driven by long-range interchain correlations. At larger diameters, a similar bell-shaped evolution of the cohesive energy is found in the helical regime, together with a striking quasi-degeneracy between zigzag and helical morphologies. Our results are directly relevant to experiments on confined dipolar soft matter, ranging from field-responsive magnetic colloids to paramagnetic granular media.<\/jats:p>","DOI":"10.1063\/5.0320145","type":"journal-article","created":{"date-parts":[[2026,2,11]],"date-time":"2026-02-11T12:27:49Z","timestamp":1770812869000},"update-policy":"https:\/\/doi.org\/10.1063\/aip-crossmark-policy-page","source":"Crossref","is-referenced-by-count":1,"title":["Dipolar cohesion in densely packed confined columns"],"prefix":"10.1063","volume":"164","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-8680-692X","authenticated-orcid":false,"given":"Yanyu","family":"Duan","sequence":"first","affiliation":[{"name":"Thrust of Advanced Materials, and Guangzhou Municipal Key Laboratory of Materials Informatics, The Hong Kong University of Science and Technology (Guangzhou) 1 , Guangzhou 511453,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-7752-2136","authenticated-orcid":false,"given":"Zecheng","family":"Gan","sequence":"additional","affiliation":[{"name":"Thrust of Advanced Materials, and Guangzhou Municipal Key Laboratory of Materials Informatics, The Hong Kong University of Science and Technology (Guangzhou) 1 , Guangzhou 511453,","place":["China"]},{"name":"Department of Mathematics, The Hong Kong University of Science and Technology 2 , Hong Kong SAR,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-2129-1698","authenticated-orcid":false,"given":"Herv\u00e9","family":"Mohrbach","sequence":"additional","affiliation":[{"name":"Laboratoire de Physique et Chimie Th\u00e9oriques, LPCT - UMR CNRS 7019, Universit\u00e9 de Lorraine 3 , 1 Boulevard Arago, 57070 Metz,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-6556-5940","authenticated-orcid":false,"given":"Ho-Kei","family":"Chan","sequence":"additional","affiliation":[{"name":"School of Science, Harbin Institute of Technology (Shenzhen) 4 , Shenzhen 518055,","place":["China"]}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-7574-6665","authenticated-orcid":false,"given":"Ren\u00e9","family":"Messina","sequence":"additional","affiliation":[{"name":"Laboratoire de Physique et Chimie Th\u00e9oriques, LPCT - UMR CNRS 7019, Universit\u00e9 de Lorraine 3 , 1 Boulevard Arago, 57070 Metz,","place":["France"]}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"317","published-online":{"date-parts":[[2026,2,11]]},"reference":[{"key":"2026021107274162700_c1","volume-title":"Columnar Structures of Spheres: Fundamentals and Applications","year":"2023"},{"key":"2026021107274162700_c2","doi-asserted-by":"publisher","first-page":"050302(R)","DOI":"10.1103\/physreve.84.050302","volume":"84","year":"2011","journal-title":"Phys. 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