DR dipole (15 deg)

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

Design

• Technical design note 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

Design media:MDR_shim.pdf

Final reports

Milhous was awarded fabrication of two DR magnets (four halves), the were procured, measured at MMF and analyzed by Riad

• 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

January 13 2021 - MMF coil measurements

From: Mike Beck <jbeck@jlab.org>
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
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.

Oct 5, 2020

• First half received from Milhous last weeks
• 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

Square wire MDS design

Feb 11, 2020 - Final signed off drawings from Danny

• Dipole fixture media:200KeVYDipoleFixture-JL0087295.pdf
• Dipole winding media:200KeVYDipoleCoil-JL0087835.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

Archive of intermediate drawings

Oct 18, 2019 - Final 15 deg coil fixture

• Drawing media:191018_15_COIL_FIXTURE.pdf