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

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(Created page with "===JLab QW Air core quad=== New Wien quadrupoles have been designed to operate at higher 200 kV energy but also with improved magnetic and mechanical design. ; Design ; Pe...")
 
 
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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.
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== What to consider in a new design? ==
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; Requirements
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* Larger ID air-core quad that could fit over 2-3/4" flange
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* 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
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* Operate w/ <10 A idea, so can use existing trim cards (like those presently used)
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; Darmstadt triplet
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:B. Steiner et al., Recent Simulation Results of the Polarized Electron injector (SPIN) of the S-DALINAC [https://www.researchgate.net/publication/228564835_Recent_Simulation_Results_of_the_Polarized_Electron_injector_SPIN_of_the_S-DALINAC] ([[media:200204_Triplet.pdf]])
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:J. Benesch, Modeling the Darmstadt quad triplet [https://jlabdoc.jlab.org/docushare/dsweb/Get/Document-200405/JLAB-TN-19-025.pdf JLAB-TN-19-025]
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== New Design ==
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; Design studies
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* Lakshmi's slides for Sep 17, 2020 Weekly meeting [[ media:QW Magnet design-V03-Lakshmi-20200913.pdf]]
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* Lakshmi's slides from Aug 31, 2020 design meeting [[media:QW Magnet design-V02-Lakshmi-20200831.pdf]]
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* Lakshmi's slides from Aug 20, 2020 design meeting [[media:QW Magnet design-V01-Lakshmi-20200819.pdf]]
  
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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.
+
; Final design report
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* EM design [https://jlabdoc.jlab.org/docushare/dsweb/Get/Document-246401/21-024.pdf JLAB-TN-21-024]
  
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; Design
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; Drawings
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* Wien crosses - [[media:JL0091130-0222-03, QW 6-way cross sketch for quote-1.pdf]]
  
 
; Performance
 
; Performance
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* Measurement (magnetic, thermal, resistance, inductive) vs. Design [https://jlabdoc.jlab.org/docushare/dsweb/Get/Document-246694/21-025.pdf JLAB-TN-21-025]
  
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== Pre-existing QW's ==
 
; Background
 
; Background
 
* These quads are used to compensate the dipole focusing of the Wien filters.
 
* These quads are used to compensate the dipole focusing of the Wien filters.
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* 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.
 
* 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.
  
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; Pre-existing drawings
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; Engineering Drawings
 
* Assembly drawing [[media:ACC2004000-1035 - QW QUAD-CROSS ASSEMBLY.pdf]]
 
* Assembly drawing [[media:ACC2004000-1035 - QW QUAD-CROSS ASSEMBLY.pdf]]
 
* Coil drawing [[media:QW_magnet.pdf]]
 
* Coil drawing [[media:QW_magnet.pdf]]
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  > dipole, 22.57 G, both evaluated at 1 cm radius.  With 1 A and 36 T,  
 
  > dipole, 22.57 G, both evaluated at 1 cm radius.  With 1 A and 36 T,  
 
  > 23.21 G quadrupole at 1 cm radius.
 
  > 23.21 G quadrupole at 1 cm radius.
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−
; 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 [https://www.researchgate.net/publication/228564835_Recent_Simulation_Results_of_the_Polarized_Electron_injector_SPIN_of_the_S-DALINAC] ([[media:200204_Triplet.pdf]])
 
−
:J. Benesch, Modeling the Darmstadt quad triplet [https://jlabdoc.jlab.org/docushare/dsweb/Get/Document-200405/JLAB-TN-19-025.pdf JLAB-TN-19-025]
 

Latest revision as of 13:21, 8 September 2021

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

What to consider in a new design?

Requirements
  • 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

New Design

Design studies
Final design report
Drawings
Performance
  • Measurement (magnetic, thermal, resistance, inductive) vs. Design JLAB-TN-21-025

Pre-existing QW's

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.
Engineering 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.
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