Difference between revisions of "QW Wien quadrupoles (200 kV upgrade)"

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===JLab QW Air core quad===
 
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New Wien quadrupoles have been designed to operate at higher 200 kV energy but also with improved magnetic and mechanical design.
 
New Wien quadrupoles have been designed to operate at higher 200 kV energy but also with improved magnetic and mechanical design.
  

Revision as of 13:10, 27 August 2020

New Wien quadrupoles have been designed to operate at higher 200 kV energy but also with improved magnetic and mechanical design.

Design
Performance
Background
  • These quads are used to compensate the dipole focusing of the Wien filters.
  • There is one installed on the 6-way cross upstream/downstream of each Wien filter.
  • They were designed to fit on top of existing 6-way viewer cross (1.5" pipe w/ 2-3/4" flanges).
  • In order to maximize the field strength they were designed w/ as small an ID as possible 2-3/4". However, this means they're captured by the flanges which are welded on after the coils are assembled. We'd love to eliminate this, to have a quad coil that would pass over the 2-3/4" flange.
  • Their length is about 4.9", the length of the 6-way cross. They could be longer, however, the 6-way cross abuts an 8" zero-reducer flange on the Wien filter, so a longer coil could not be perfectly symmetric on the 6-way cross. But, that's OK. A great way to recover field strength, I guess.
Pre-existing drawings
QW info
  • Present operating limit is 3A
  • Field measurements may exist, need to look
  • Jay should have a model of the quads, a good starting place, here's info from him:
On 3/5/2020 2:42 PM, Jay Benesch wrote:
> IR of QW model 1.375".  Cross section 0.3" radial by 0.22" azimuthal. 
> 4.92" overall length.  35 AT in my 1A model, not 36 T.  0.55 G-cm 
> dipole, 22.57 G, both evaluated at 1 cm radius.  With 1 A and 36 T, 
> 23.21 G quadrupole at 1 cm radius.
What to consider in a new design?
  • Larger ID air-core quad that could fit over 2-3/4" flange
  • Longer quad to provide more field strength (required values under study; appears we need at least 33% increase over existing QW @ 3A)
  • Quads have to be bakeable to 250C; as they're still captured when vacuum assembly made-up before beam line bake out
  • Operate w/ <10 A idea, so can use existing trim cards (like those presently used)
Darmstadt triplet
B. Steiner et al., Recent Simulation Results of the Polarized Electron injector (SPIN) of the S-DALINAC [1] (media:200204_Triplet.pdf)
J. Benesch, Modeling the Darmstadt quad triplet JLAB-TN-19-025
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