Status of the AC Dipole Studies

1
Status of the AC Dipole Studies

• Ryoichi Miyamoto (UT Austin)
• LARP Meeting at FNAL 9/12/2007

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LHC AC dipoles will be the Tevatron style.
Machine RHIC Tevatron LHC
E GeV 250 980 7000
frev kHz 78 48 11
?, 1- ? 0.69, 0.31 0.58, 0.42 0.3, 0.7
fd kHz 55 20.5 3, 8,
d 0.01 0.01 0.01
ßarc , ßd m 45, 11 80, 47 180, 260
s mm 0.75 0.5 0.3
Bdl Gm (4s) 140 140 165

• RHIC AC dipole system
• air core magnet custom made amplifier
• Tevatron AC dipole system
• already installed (iron core) pinger audio
  amplifier

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Requirement to the Power Supplyto Produce 4s
Oscillation _at_ the Collision Energy
Tevatron AC Dipole LHC AC Dipole
Imagnet A 450 1700
Rmagnetcalbe mO 85 11
PI2R/2 kW 8 16
Results of the Power Supply Tests
Pdesign kW Pmagnet kW Imagnet A
Crown I-T8000 8 4.5 320
LabGruppen FP13000 13 4.5 320
2 Crowns 16 6.5 390
2 LabGruppens 26
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Schematic Diagram ofthe Dual Amplifier System
Potential Issues

• Burst length?
• An audio amplifiers doesnt like
• resonant circuits?
• Transformer?

NP
NS

Power to produce 200 A
-

-
NP
Lossy Core!
ZL 10 O
5
An AC dipole has an influence like a thin quad.
Measured Phase Space _at_ B0 IP
d ?d - ?
Beam motion is still given by
true ß
d -0.01
d -0.02
Change of ß is the same as a thin quad
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Vertical ß for New Proton and Pbar Helicies
Proton Helix
ßv,B0 35.9 cm ßv,D0 36.2 cm
Pbar Helix
ßv,B0 27.9 cm ßv,D0 30.8 cm