"Static" steering correction on the DB Quadrupoles
Alexey Vorozhtsov14 Dec 2010
Alexey Vorozhtsov 2
DB QUAD parameters CLIC DB Quadrupole Parameters Units
MAGNET Magnet size H×S×L [mm×mm×mm] 390×390×286Magnet mass [kg] 149.2Full aperture [mm] 26
Good field region(GFR) diameter [mm] 11×2=22
YOKEYoke size H×S×L [mm×mm×mm] 390×390×180Yoke mass [kg] 29.4×4=117.6
COIL
Hollow Conductor size [mm] 6×6, Ø=3.5
Number of turns per coil 52
Total conductor mass [kg] 31.6
Operation mode10% of nominal Nominal 120% of nominal
Effective length [mm] 194.7 194 192.5Gradient at Z=0 [T/m] 6.26 62.78 75.85
Integrated gradient ∫Gdl [T] 1.218 12.18 14.6
Integrated gradient quality in GFR % 0.04 0.01 0.02
Electrical parameters
Ampere turns per pole [A] 432 4840 9100
Current [A] 8.3 93 175Current density [A/mm2] 0.3 3.6 6.8Total resistance [mOhm] 99 99 99Total inductance [mH] 40 40 40Voltage [V] 0.82 9.2 17.3Power [kW] 0.007 0.86 3.03
COOLINGAir (natural convection) Water Water
Cooling circuits per magnet 4 4
coolant velocity [m/s] 1.1 1.9
cooling flow per circuit [l/min] 0.6 1.1
Pressure drop [bar] 2.2 5.7Reynolds number 4122 8210Temperature rise [K] 5 10
IWLC10, WG6, 10/20/2010
Steerer for DBQParameters for CLIC DB Steerer
Parameter UnitIntegrated field ∫Bdz 12 [mTm]Magnetic length 195 [mm]Field at center B(0) 0.062 [T]Ampere-turns per pole 600 [A]Number of turns per coil 6Current 100 [A]
Steerer coil
Quadrupole coil
Opera 2D 180deg modelQuadrupole only, IW=4900[A], -for nominal ∫Gdz=12.18[T]
Opera 2D 180deg modelCorrector only, IW=600[A], B1=0.062[T], ∫Bdz=12[mTm]
11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 110.04
0.05
0.06
0.07
0.08
0.09
0.1
0.11
Corrector ONLY 600[A]
Corrector field in the Horizontal plane
X [mm]
By[
T]
• Field error =50% at GFR=11[mm]
• Sextupole component B3 w.r.t. B1(main): B3/B1=50%
Opera 2D 180deg modelQuadrupole +Corrector, IwCorr=600[A], IwQuad=4900[A]
• Non symmetrical field distribution due to the iron saturation.
• Dipole field decreased from 0.062T to 0.045[T] (Iron saturation)
• Full spectrum of “forbidden” harmonics in quadrupole : B3,B5…
11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 110.04
0.05
0.06
0.07
0.08
0.09
0.1
0.11
Corrector ONLY 600[A]Corrector field 600[A] with QUAD on 4900[A]
Corrector field in the Horizontal plane
X [mm]
By[
T]
Non symmetrical field distribution(Iron saturation)
Non symmetrical field distribution(Iron saturation)
Opera 2D 180deg model Quadrupole +Corrector, IwCorr=60[A], IwQuad=430[A] (10% of nominal)
11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 114 10
3
5 103
6 103
7 103
8 103
9 103
0.01
0.011
Corrector ONLY 60[A]Corrector field 60[A] with QUAD on 430[A]
Corrector field in the Horizontal plane
X [mm]
By[
T]