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.
 
A new 15 deg bend magnet was designed to operate at higher beam energy and to minimize higher order multipoles.
  
== Final reports ==
+
== Design ==
 +
; Modeling TN [https://jlabdoc.jlab.org/docushare/dsweb/Get/Document-207097/19-041.pdf JLab-TN-19-041]  [[media:19-041.pdf]]
  
; Milhous was awarded fabrication of two DR magnets (four halves), the were procured, measured at MMF and analyzed by Riad:
+
; ME drawings (square wire, Feb 11, 2020)
* MMF measurements of DR001 - [[media:Dipole_15deg_DR001_FieldMap.txt]]
+
* MMF measurements of DR002 (installed at CEBAF) - [[media:Dipole_15deg_DR002_FieldMap.txt]]
+
* Riad's analysis of the two dipoles - [[media:Dipole15deg_FieldMap.pptx]]
+
  
== MMF Updates during fabrication and QC ==
+
::- Dipole fixture [[media:200KeVYDipoleFixture-JL0087295.pdf]]
 +
::- Dipole winding [[media:200KeVYDipoleCoil-JL0087835.pdf]]
  
; January 13 2021 - MMF coil measurements
+
; Shims for canted operation
 +
::- [[media:MDR_shim.pdf]]
 +
::- [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)
 +
::- 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
  
From: Mike Beck <jbeck@jlab.org>
+
== Fabrication ==
Sent: Wednesday, January 13, 2021 9:22 AM
+
To: Joseph Meyers
+
Cc: Joe Grames; Jay Benesch; Riad Suleiman
+
Subject: Inductance/DCR DR 15* dipoles
+
Measured Inductance and DCR values for the DR 15* dipoles in half's.
+
  
Magnet DR01
+
; Milhous was awarded fabrication of two DR magnets (four halves).
TOP-SN#01
+
L/60Hz=1.617mH
+
DCR=915.9 milliohm
+
BOTTOM-SN#02
+
L/60Hz=1.563mH
+
DCR=887.1 milliohm
+
  
Magnet DR02
+
* 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 halveCoil 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 mappingMilhous winding another half, will shop to JLab ASAP, within a week or so
TOP-SN#03
+
L/60Hz=1.527mH
+
DCR=881.5 milliohm
+
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.
+
== Measurments ==
  
; Oct 5, 2020
+
* MMF measurements of DR001 - [[media:Dipole_15deg_DR001_FieldMap.txt]]
 +
* MMF measurements of DR002 (installed at CEBAF) - [[media:Dipole_15deg_DR002_FieldMap.txt]]
 +
* Riad's analysis of the two dipoles - [[media:Dipole15deg_FieldMap.pptx]]
  
*First half received from Milhous last weeks
+
(January 13 2021 - MMF coil measurements)
*Mike's report ... 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.
+
*Joe Meyer's report ... Milhous winding another half, will shop to JLab ASAP, within a week or so
+
  
== Intermediate Fabrication Drawings and Documents ==
+
;Magnet DR01
 +
TOP-SN#01
 +
L/60Hz=1.617mH
 +
DCR=915.9 milliohm
 +
BOTTOM-SN#02
 +
L/60Hz=1.563mH
 +
DCR=887.1 milliohm
  
; Square wire MDS design
+
; Magnet DR02
Feb 11, 2020 - Final signed off drawings from Danny
+
TOP-SN#03
* Dipole fixture [[media:200KeVYDipoleFixture-JL0087295.pdf]]
+
L/60Hz=1.527mH
* Dipole winding [[media:200KeVYDipoleCoil-JL0087835.pdf]]
+
DCR=881.5 milliohm
 +
BOTTOM-SN#04
 +
L/60Hz=1.540mH
 +
DCR=887.3 milliohm
  
; Specifications and markup documents
+
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.
Oct 23, 2019 - Jay mark-up for low- and high- energy coil
+
 
* Drawing [[media:191023_Jay_dwg_markup.pdf]]
+
== Intermediate design exchanges ==
* Specification [[media:191023_Jay_spec.docx]]
+
  
 
; Archive of intermediate drawings
 
; Archive of intermediate drawings
 
Oct 18, 2019 - Final 15 deg coil fixture
 
Oct 18, 2019 - Final 15 deg coil fixture
 
* Drawing [[media:191018_15_COIL_FIXTURE.pdf]]
 
* Drawing [[media:191018_15_COIL_FIXTURE.pdf]]
 +
 +
; Specifications and markup documents
 +
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]]

Revision as of 16:38, 14 June 2021

A new 15 deg bend magnet was designed to operate at higher beam energy and to minimize higher order multipoles.

Design

Modeling TN JLab-TN-19-041 media:19-041.pdf
ME drawings (square wire, Feb 11, 2020)
- Dipole fixture media:200KeVYDipoleFixture-JL0087295.pdf
- Dipole winding media:200KeVYDipoleCoil-JL0087835.pdf
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

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

Measurments

(January 13 2021 - MMF coil measurements)

Magnet DR01

TOP-SN#01 L/60Hz=1.617mH DCR=915.9 milliohm BOTTOM-SN#02 L/60Hz=1.563mH DCR=887.1 milliohm

Magnet DR02

TOP-SN#03 L/60Hz=1.527mH DCR=881.5 milliohm 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.

Intermediate design exchanges

Archive of intermediate drawings

Oct 18, 2019 - Final 15 deg coil fixture

Specifications and markup documents

Oct 23, 2019 - Jay mark-up for low- and high- energy coil