1. Helicity Magnets for PQB Feedback Helicity Magnets for PZT Booster
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
1. The injector group got their first experience with the new strained layer superlattice GaAs crystals during a real experiment (Happex He and a little bit of hydrogen).
2. To check whether or not helicity-correlated properties will be significantly different at 800 MeV, we plan to submit a test plan to run at 1 pass beam energy.
3. HAPPEx managed to get pretty good position differences with no position feedback.
4. Results on microwave cavity monitor electronics were obtained in Hall A; the electronics still needs more work; continued work on this is planned in Hall A during the fall.

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 (full range is 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 => 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.