LCLS quadrupoles after upgrade 123 laminations - PowerPoint PPT Presentation

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LCLS quadrupoles after upgrade 123 laminations

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Center motion is less than 2 m. Quad#1 data are very close to shown ... specifics of magnetic measurement system (encoders resolution) scan in Y is preferable. ... – PowerPoint PPT presentation

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Title: LCLS quadrupoles after upgrade 123 laminations


1
LCLS quadrupoles after upgrade (123 laminations)
  • Quadrupole 1,2

2
Center motion from Hall probe datadue to
quadrupole change
Scan of Bx(T) vs Y(mm). Done for quad currents
I-6A, 6A, 4.5A20 Center motion is less than 2
µm. Quad1 data are very close to shown here
3
Center motion from Hall probe datadue to
correctors (article1)
Scan of Bx(T) vs Y(mm). Done for I(Q)4.5A
Corrector current was changed from 0.5 A to
0. Center motion is close to 1 µm.
4
No quadrupole saturation
5
Hall probe scan Bx vs. Z
Red Y2.5 mm, Blue Y-2.5 mm
6
Hall probe scan
Integrated gradient calculated from slide 4 is
3.13 T _at_ I4.5 A and 4.17 T 0.2 _at_ I6 A
7
Hall probe scan By vs. Z
Gradient G(z)B(x2.5mm)-B(x-2.5mm)/2x Integr
ated gradient for 1mmltZlt130mm is 4.136 T1 _at_ I6A
8
Correctors _at_ I0.5A
9
Correctors _at_ 0.5A
Close to article 2 JxgtJy by 15
10
Summary
  • Strength of quadrupole at 4.5A is 3.13 T
  • at 6A is 4.17 T
  • integrated over
    129 mm
  • Data shown correspond to Hall probe measurements
    of horizontal field dependence on Y. Due to
    specifics of magnetic measurement system
    (encoders resolution) scan in Y is preferable.
  • All data agree very well with previous
    measurements. The difference is change in field
    integrals, which is proportional to the number of
    laminations.
  • Accuracy of integrated gradient depends on
    knowledge of distance between two scans
    (5mm0.01mm) and alignment of Hall probe and
    could be estima
  • ted as 0.5

11
Integrated gradient vs. quad cycles
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