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.

Final drawing of the magnet is XXXXX.

Milhous was awarded fabrication of two DR magnets (four halves).

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
Square wire MDS design

Feb 11, 2020 - Final signed off drawings from Danny

Specifications and markup documents

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

Archive of intermediate drawings

Oct 18, 2019 - Final 15 deg coil fixture

January 13 2021 - coils 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.