Helicity Magnet Update

1
Helicity Magnet Update Grames, Yves, Chao,
Michele, Dickson, Flood, Cumbia BTeam Meeting, 10
January 2006

• Helicity Magnets for PQB Feedback
• Helicity Magnets for PZT Booster

2
Helicity Magnets Commissioning

• ATLIS 4271 w/ new PC104 magnet card on 12/22,
  2005
• All 4 helicity magnets appear to be linear,
  independent (not coupled), and electrically
  isolated
• Each magnet manifest some saturation when DAC
  value around -1500 (full range is -2000 to
  2000)
• Resolution is about 100 nm/DAC step, new DAC to
  be installed in January will give 10 nm/DAC step
• Position feedback seems viable. Can do both
  position and angle corrections (x,x) and (y,y)
• Correction in both helicity states (not done yet)

3
Helicity Magnet 1 (vertical)
4
Helicity Magnet 2 (horizontal)
5
Helicity Magnet 3 (vertical)
6
Helicity Magnet 4 (horizontal)
7
Position Feedback Induced Charge Asymmetry

• As measured in the 5 MeV region around
• OLO5
• PZT x-scan on January 21, 2005
• Position induced charge asym 50 ppm/um
• Helicity Magnet 2 scan on Dec 22, 2006
• Position induced charge asym 0.5 ppm/um

8
HM for PZT Booster

• ATLIS 4249 - Install 30hz Drive Capacity for HM
• ATLIS 4183 Testing Helicity Magnets (w/ 30 Hz
  functionality)
• all 4 HM work in new 30 Hz BPM synchronization
  mode
• amplitudes appear sufficient (2-5 mm), although
  MHE0L03V is somewhat smaller
• 30 Hz orbit stable
• PZTBooster concept seems viable

9
PZT Booster Development
Chao/Yves/Michele/Joe working together to
define goals, requirements, software, testing and
plans. Basic goal gt mimic small amplitude 30Hz
PZT mirror orbit through entire machine, for
matching. Anticipate being able to test/debug
software during Jan. restoration and G0 setup
period, but not scheduled yet because too soon to
do so. Anticipate full scale testing at latest
during BS in February to be requested as
preparation tests.