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1. Describe helicity magnet (HM) system 2. Con’s of PZT’s & Pro’s of HM–type system for BT measurements 3. Other Possibilities, Comments from BT & Planning.

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Presentation on theme: "1. Describe helicity magnet (HM) system 2. Con’s of PZT’s & Pro’s of HM–type system for BT measurements 3. Other Possibilities, Comments from BT & Planning."— Presentation transcript:

1 1. Describe helicity magnet (HM) system 2. Con’s of PZT’s & Pro’s of HM–type system for BT measurements 3. Other Possibilities, Comments from BT & Planning Helicity Magnet Usage for Optics Measurements 9/27/05 – Chao, Grames

2 Helicity Magnet System Purpose - Produce helicity correlated beam orbit (position and/or angle) for the purpose of study or feedback. Requirements 1.Position and Angle -> 2 H and 2 V magnets 2.Mimic Helicity Pattern -> Litz wire high bandwidth magnets customized power supplies 3.Suitable dyanmic range -> Exceed  u,  u’ at injector + suited @ 5 MeV 4.Uncorrelated w/ charge asymmetry -> Downstream of apertures 5.Zero cross-talk -> Electrically isolated system, fiber optic controls History 1.Idea scoffed at prior to 2003, but proposal considered during G0 prep. 2.Working group formed (Areti, Cumbia, Dickson, Flood, Grames) 3.Design + Review + Hurried Installation -> Not used by G0/HAPPEX (2004) 4.Improvements & functional system (Spring, ‘05) 5.HAPPEX He testing (Summer ‘05) and preparation for HAPPEX-H

3 MHE0L01V MHE0L03V, MHE0L03H MHE0L02H 110 VAC Isolation Transformer Grounded cage containing electrically isolated helicity magnet controls (VME) Tube protecting Litz magnet wire Injector Helicity Magnet Installation (0L01-0L03) January 5-6, 2004

4 Closer look…

5 Con’s of PZT’s & Pro’s of HM–type system ItemCon’s PZTPro’s HM BPM AmplitudeSmall (100’s um) Large (mm’s) Position/AngleCoupledUncoupled Beam Mode UsedCW for small amplitude Tune OK w/ large amplitude Physical LocationUpstream of apertures Downstream of apertures Optics LocationBefore less understood reg. After less understood reg. Comparison with Parity Experiment Different perturbation (30 Hz vs. HEL) Same perturbation (dual purpose)

6 Possibilities, Comments & Planning 1.BT Studies – magnets can produce DC kicks (FOpt) or Large Amplitude 30 Hz orbit (C-S), may be helpful to improve Injector-Arc1 matching. 2.HAPPEX-He studies provide typ. performance summary (pending). 3.“As is” setup may be sufficient for Chao’s studies. Note: usefulness is downstream of cryo-unit, however, we may improve understanding upstream of cryo-unit as a result. 4.Requests to improve or evolve the system welcome -> gauge cost/benefit

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