Difference between revisions of "DR dipole (15 deg)"

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A new 15 deg bend magnet was designed to operate at higher beam energy and to minimize higher order multipoles.
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A new 15 deg bend magnet was designed to operate at higher beam energy, providing equal focusing in both planes, and minimize higher order multipoles.
  
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Final drawing of the magnet is XXXXX.
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It is given the name "DR", successor to the low energy "DS"
  
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Milhous was awarded fabrication of two DR magnets.
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== DR Design ==
 +
;Jay's magnet design model
 +
*  TN [https://jlabdoc.jlab.org/docushare/dsweb/Get/Document-207097/19-041.pdf JLab-TN-19-041]  [[media:19-041.pdf]]
 +
*  Canting coils +/- 0.8 deg is predicted to achieve equal focusing in both planes
  
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; Magnetic performance
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; ME drawings which were used by Milhous to fabricate the coil (square wire, Feb 11, 2020)
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We went through both square and round wire designs; finally used a round wire
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*Dipole fixture [[media:200KeVYDipoleFixture-JL0087295.pdf]]
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*Dipole winding [[media:200KeVYDipoleCoil-JL0087835.pdf]]
  
 +
; Intermediate drawings and mark-ups
 +
*Oct 18, 2019 - Final 15 deg coil fixture => Drawing [[media:191018_15_COIL_FIXTURE.pdf]]
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* Oct 23, 2019 - Jay mark-up for low- and high- energy coil => Drawing [[media:191023_Jay_dwg_markup.pdf]], Specification [[media:191023_Jay_spec.docx]]
  
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; Square wire MDS design
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; DR shims for canted operation
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Feb 11, 2020 - Final signed off drawings from Danny
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*[[media:MDR_shim.pdf]]
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* Dipole fixture [[media:200KeVYDipoleFixture-JL0087295.pdf]]
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*[https://www.mcmaster.com/catalog/127/3509 Laminate shim stock] (2 mil/layer * 31 layers = 64 mil laminate, where each 2 mil layer can be peeled away)
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* Dipole winding [[media:200KeVYDipoleCoil-JL0087835.pdf]]
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*28 mil shim needed for 1.688 deg angle between upper and lower coils (top 0.844 deg cw, bottom 0.844 deg ccw)
 +
*each 2 mil layer of shim corresponds to a change in this angle by 0.048 deg (e.g. 28=>30 mil reduces angle to 1.640 deg, or 28=>26 mil increases angle 1.736 deg)
 +
*we have 6 shims on hand, that is, we may choose up to 6 angles
  
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; Specifications and markup documents
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== DR Milhous Fabrication ==
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Oct 23, 2019 - Jay mark-up for low- and high- energy coil
+
; Milhous was awarded fabrication of two DR magnets (four halves).
−
* Drawing [[media:191023_Jay_dwg_markup.pdf]]
 
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* Specification [[media:191023_Jay_spec.docx]]
 
  
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; Archive of intermediate drawings
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* Oct 5, 2020 (M. Beck) First half received from Milhous last week. The dimension inspection of the aluminum coil fixture is correct. Electrical testing, hipot and surge testing at 500V is completed, all meet JLAB acceptance criteria.  Can not confirm turn count is correct with this kind of winding process and there is no additional coil to conduct coil comparison testing. It might be reasonable to assume the wire count is correct as we only have one halve section and no mapping can occur until we receive the next halve.  Coil appearance looks reasonable for the fashion used for fabrication/winding. We just need 3 more halve sections to put these magnets together, after QA is completed on the additional 3 articles we will begin mapping.  Milhous winding another half, will shop to JLab ASAP, within a week or so
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Oct 18, 2019 - Final 15 deg coil fixture
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* Drawing [[media:191018_15_COIL_FIXTURE.pdf]]
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== DR Measurments ==
 +
;January 13 2021 - MMF coil measurements
 +
*DR001 (stored at MMF - Top coil appears to have additional 2-3 windings)
 +
**[[media:Dipole_15deg_DR001_FieldMap.txt]]
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**TOP-SN#01, L/60Hz=1.617mH, DCR=915.9 milliohm
 +
**BOTTOM-SN#02, L/60Hz=1.563mH, DCR=887.1 milliohm
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*DR002 (installed at CEBAF)
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**[[media:Dipole_15deg_DR002_FieldMap.txt]]
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**TOP-SN#03, L/60Hz=1.527mH, DCR=881.5 milliohm
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**BOTTOM-SN#04, L/60Hz=1.540mH, DCR=887.3 milliohm
 +
 
 +
From Jay - The ratio of inductances suggests a 1.7% turns discrepancy while resistance suggests 3.2% top vs bottom in DR01.  (inductance goes as N^2, resistance as N).  I suggest using the DR02 in the machine.
 +
 
 +
== DR Analysis ==
 +
* Riad's analysis of the two dipoles - [[media:Dipole15deg_FieldMap.pptx]]

Latest revision as of 09:47, 25 June 2021

A new 15 deg bend magnet was designed to operate at higher beam energy, providing equal focusing in both planes, and minimize higher order multipoles.

It is given the name "DR", successor to the low energy "DS"

DR Design

Jay's magnet design model
ME drawings which were used by Milhous to fabricate the coil (square wire, Feb 11, 2020)

We went through both square and round wire designs; finally used a round wire

Intermediate drawings and mark-ups
DR shims for canted operation
  • media:MDR_shim.pdf
  • Laminate shim stock (2 mil/layer * 31 layers = 64 mil laminate, where each 2 mil layer can be peeled away)
  • 28 mil shim needed for 1.688 deg angle between upper and lower coils (top 0.844 deg cw, bottom 0.844 deg ccw)
  • each 2 mil layer of shim corresponds to a change in this angle by 0.048 deg (e.g. 28=>30 mil reduces angle to 1.640 deg, or 28=>26 mil increases angle 1.736 deg)
  • we have 6 shims on hand, that is, we may choose up to 6 angles

DR Milhous Fabrication

Milhous was awarded fabrication of two DR magnets (four halves).
  • Oct 5, 2020 (M. Beck) First half received from Milhous last week. The dimension inspection of the aluminum coil fixture is correct. Electrical testing, hipot and surge testing at 500V is completed, all meet JLAB acceptance criteria. Can not confirm turn count is correct with this kind of winding process and there is no additional coil to conduct coil comparison testing. It might be reasonable to assume the wire count is correct as we only have one halve section and no mapping can occur until we receive the next halve. Coil appearance looks reasonable for the fashion used for fabrication/winding. We just need 3 more halve sections to put these magnets together, after QA is completed on the additional 3 articles we will begin mapping. Milhous winding another half, will shop to JLab ASAP, within a week or so

DR Measurments

January 13 2021 - MMF coil measurements

From Jay - The ratio of inductances suggests a 1.7% turns discrepancy while resistance suggests 3.2% top vs bottom in DR01. (inductance goes as N^2, resistance as N). I suggest using the DR02 in the machine.

DR Analysis

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