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[TCML] Trumpet Coil Geometry
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[TCML] Trumpet Coil Geometry
To : tcml@xxxxxxxxxxxxxxx Subject : [TCML] Trumpet Coil GeometryFrom : Mark Rzeszotarski via Tesla <tcml@xxxxxxxxxxxxxxx >Date : Thu, 27 Aug 2026 10:47:14 -0400Arc-authentication-results : i=1; mta-outp-cfd-1; arc=none smtp.remote-ip=129.22.103.196Arc-filter : OpenARC Filter v1.3.0 mta-outp-cfd-1.case.edu 9D2B74DFArc-message-signature : i=1; d=case.edu; s=cwru-mta; a=rsa-sha256; c=relaxed/simple; t=1787842044; h=DKIM-Signature:Message-ID:Date:MIME-Version:To:From:Subject:to: subject:message-id:date:from:mime-version:dkim-signature; bh=kc04Nuw4YH5Tm7ydlcm3STR7i5BVkTmoprP7bUSJc/4=; b=OJqADR4mYYpj2cBymNVNvPKA+pdybMzje/9AB1ejrUjQ80zOCTgy4qmyXUUG5Tt94AYx aBvhRz0aTGl+ZxM4F/KxttnidnSIVnJzejdAVO4GOCyHRxuiCzXPJ9ZEgGY+anhTnAUrR hxQJHnuSgY7tiJRvZM8BPx6KngI2qYdLgRsgbP7tc7JKkDlibUvQGoE/ZZdZ2ccljYNuZ IPfJIl89UbuoOgy0OfxTfyaqZ2SY96aoWKvm1DxO3pAahPvCiWu5Ecfpl4LR5uQXhOTim 1C2gIRUHWvt+kcWM1AXT1pSAdhH6H36x/oPV9ytF/CVjaARhLC2dEET6ecA6lGoagWw==Arc-seal : i=1; d=case.edu; s=cwru-mta; a=rsa-sha256; cv=none; t=1787842044; b=lixKHCBSXWKIAJ52gx3NZlM8v5hmhp0lmkRr2lzWAkkPtyL3MIyFaMh9zfyH5Rp9JRz8 BoIR2iu6Tjx9cZ4TsEiNQSoXQwg6IHFP9bk5hEuiCflFilebxGKz/lIJV27OwugfQGRbu mLYYkTIzfO9TX/8w2bFR9gYN1azf5z4FFiZdDAGAf2tDQ0MnVYY2X0VFwvgpOiJi3Ceq7 6TKERJgTQ0mc7mP1jaQ+sJr7DHcM6+gccE495/bs8gOTDb6B2NE61s+GvgSU7W9m9IrMO Y/3KXPfOSCag3aNtg+JSkwUZZ9xY4CUCB1vDDXUyKWwXeCrgEIkXFjzY3lCweG8K21w==Archived-at : <https://tcml.pupman.com/archives/list/tcml@xxxxxxxxxxxxxxx /message/QTTWJY6WBJFGDMSR5JJXSKDEG3XXSPZV/>Authentication-results : piggy.pupman.com; dkim=pass (2048-bit key, unprotected) header.d=emwd.com header.i=@emwd.com header.a=rsa-sha256 header.s=harmony header.b=SzYJT4dN; dkim=fail reason="signature verification failed" (2048-bit key, unprotected) header.d=case.edu header.i=@case.edu header.a=rsa-sha256 header.s=g-case header.b=hF2Yr90pAuthentication-results : host.harmonylists.io; dkim=pass (2048-bit key; unprotected) header.d=case.edu header.i=@case.edu header.b="hF2Yr90p"; dkim-atps=neutralAuthentication-results : mta-outp-cfd-1; arc=none smtp.remote-ip=129.22.103.196Authentication-results : mta-outp-cfd-1.case.edu; dkim=pass header.d=case.edu header.s=g-case header.b=hF2Yr90p; spf=pass (mta-outp-cfd-1.case.edu: domain of msr7@xxxxxxxx designates 129.22.103.196 as permitted sender) smtp.mailfrom=msr7@xxxxxxxx ; dmarc=pass (policy=reject) header.from=case.eduCc : Mark Rzeszotarski <msr7@xxxxxxxx >Delivered-to : teslaarchive@xxxxxxxxxx Dkim-filter : OpenDKIM Filter v2.11.0 piggy.pupman.com D886C42BEC3Dkim-signature : v=1; a=rsa-sha256; c=simple/simple; d=emwd.com; s=harmony; t=1787847220; bh=THXQ1Wze5FB/gO96g4rUdlzpKB9Zn/YN9m24DCwY0ao=; h=Date:To:Reply-To:Subject:List-Id:List-Archive:List-Help: List-Owner:List-Post:List-Subscribe:List-Unsubscribe:From:Cc:From; b=SzYJT4dNzvU7o6//9RhjA6jzqo4VuxHsrCVlolAwKrhAidBXF37G+DJOWiFeh5QFy swUJQC2PinZRborFB3xwvahCTFRzo/0ONCCOAn94vznHWcEuaRXafbgqPEUIPZw5+/ yw50qcdEBaEEU1u+pn4CVTwsI4WvpngCFz47UjDrWHh4afhUJoy347y72u5oilJ+m8 ehLLl20eDrIlAsx9B2uITnCb5rZIltRZR4AuTCdS91M8GoKVHKmKoq2Kw/zxRArdpb wmWqevEwgmxcvw2w5U+yvLW4sJEm3z3nVWIBL/z68pytOmz6DCE+TMyQ8nDcDLJm8s 8acIU/gPYNhcw==Dkim-signature : v=1; a=rsa-sha256; c=relaxed/relaxed; d=case.edu; s=g-case; t=1787842039; x=1788446839; darn=tcml.pupman.com; h=content-transfer-encoding:content-type:subject:from :content-language:to:user-agent:mime-version:date:message-id:from:to :cc:subject:date:message-id:reply-to:content-type; bh=ivaewmlDe2+HvcaYEkaJgfQssJwGykBSEF7OdAvMAg0=; b=hF2Yr90pRbEzKuE3CsMJMJAgWSD2UjNgjKr6lFjfrZrZv4TxU4GK32d4snK0540Hh0 +UM0xz+StH8AVbEvve3+eax1xFOPkBCFMs1g5lcm42vOO5aQW2v4dO2drfyQugtv52vv FTQd70URA31A1rY5kd/768wC5UhiNF425dNH5vF1zjdS3M9BqMsvPE7VkwNu9efZwoZv UV2/v6tnh+SSXejW8ig3D8cuQGEoYT366XgEuMjMmo+tXWY577PuuqNhGMvQaO6QX7mA 5n6jDsRvm7CBaTHoTrsJQBYCuN9KG6ulaPP2TLayj10+OiehhB34p/0ZG+3Jw8kjvXSi 9gXg==List-archive : <https://tcml.pupman.com/archives/list/tcml@tcml.pupman.com/ >List-help : <mailto:tcml-request@tcml.pupman.com?subject=help >List-id : Tesla Coil Mailing List <tcml.tcml.pupman.com>List-owner : <mailto:tcml-owner@tcml.pupman.com >List-post : <mailto:tcml@tcml.pupman.com >List-subscribe : <mailto:tcml-join@tcml.pupman.com >List-unsubscribe : <mailto:tcml-leave@tcml.pupman.com >Reply-to : Tesla Coil Mailing List <tcml@xxxxxxxxxxxxxxx >User-agent : Mozilla Thunderbird
My concern with this geometry is that the majority of the coil
inductance will be at the trumpet end, far from a primary coil. This
would make it difficult to couple sufficient energy into the secondary
when the primary is positioned near the small diameter portion of the
secondary.
I once built a flat spiral secondary with a helical primary around it.
The voltage rise in the secondary was greatest in the few outer turns,
giving rise to significant arc-overs. Inductance depends on the radius
squared so most of the inductance will be in the trumpet bell.
Mark Rzeszotarski
--
Mark S. Rzeszotarski, Ph.D., FAAPM, DABR
Emeritus Professor of Radiology
Emeritus Professor of Biomedical Engineering
Case Western Reserve University
Cleveland Ohio, U.S.A. 44109
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