10/5/2005 jrz1 Not quite “All” you want to know about Flying Wires At Fermilab Jim Zagel 10/5/2005

10/5/2005 jrz2 Agenda History What are they? Where are they? What do they measure? Issues

10/5/2005 jrz3 Ancient History Flora-Gannon Early 80’s

10/5/2005 jrz4 The 91 Upgrade Proximity Sensors Broken Wire Monitor Eliminate Paint Can’s Dual Wire Fork in Tev

10/5/2005 jrz5 What Are they? Carbon Filament –Originally all 33um –now Tev 7um at E-11 P-Bar Tail –Soon 7um MI &Tev E-17

10/5/2005 jrz6 Rotary Motion Geometry

10/5/2005 jrz7 Rotary Motion Feedback Optical Encoder –Relative Position –Absolute Index Mark –Precision (2 arc-min.) Resolver –Absolute Position –Rad Hard –Ratio of Sign to Cosine –Precision (4-6 arc-min.)

10/5/2005 jrz8 Encoder Signals Phase A, B, and Index

10/5/2005 jrz9 Wire Mounting Clamped Carbon Pretension

10/5/2005 jrz10 Where Are They?

10/5/2005 jrz11 Main Injector Q102 HorizontalQ103 Vertical

10/5/2005 jrz12 Recycler 619 Vertical 620 Horizontal

10/5/2005 jrz13 Tevatron E-17 horizontal E-11 Horiz & Vert

10/5/2005 jrz14 P-Bar Source High Dispersion Low Dispersion Encoder Low Dispersion Resolver

10/5/2005 jrz15 P-Bar Source Schematic

10/5/2005 jrz16 Beam View of Pbar Wire High Dispersion vertical wires –Core on Left –Tail on Right

10/5/2005 jrz17 Multiple Configurations 5 wires in P-Bar 3 wires in Tev 2 wires in MI & RR

10/5/2005 jrz18 Block Diagram

10/5/2005 jrz19 Fly Spec Defines the measurement –Clock Event –Pattern –PMT Voltage –PMT Filter –Sequence

10/5/2005 jrz20 What Do they Measure? Profiles of Loss vs (angular) Position AND THAT’S ALL! Everything else is calculated Early 80’s Data Modern LabView Presentation

10/5/2005 jrz21 PMT Loss Monitor New –5380 PMT –Flip in filters 60% 90% –Designed byYuriy Pischalnikov

10/5/2005 jrz22 Raw Signals Smooth accelerate/decelerate with constant speed while taking data samples 2 passes through beam for each fly.

10/5/2005 jrz23 Raw Signals 2 Captures bunch by bunch Second batch injection in MI

10/5/2005 jrz24 Gate Timing Gates sample at 11.1 us on this fly.

10/5/2005 jrz25 What Do they Calculate? Sigma of a Gaussian –Using Levenberg- Marquardt nonlinear fit –With baseline Then using intensity, energy, and beta, they calculate emittance. Does very well for Gaussian beams

10/5/2005 jrz26 Issues Wire Heating –Hi intensity NiMI beam can burn up 33um wire Vacuum rotary feed through upgrade –Ferro Fluidic good for Torr –Working on magnetic replacement for Tev Emittance growth for multiple flies in storage rings Scraped beams are not Gaussian Update Older Computers

10/5/2005 jrz27 Wire Heating Tevatron flying wire temperature at 980 GeV and 1E13 particles vs. beam displacement (cm). MI flying wire temperature at 120 GeV and 2E13 protons vs. beam displacement (cm). The red line is the melting point of carbon. Source Martin Hu

10/5/2005 jrz28 Fits Recycler bunch 1, Store 4378, third transfer bunch 3, Store 4378, first transfer Source Martin Hu

10/5/2005 jrz29 Recent Pertinent Papers Emittance growth due to Tev Wires –Syphers, Eddy, September, 2004 Wire Heating Estimates –Martin Hu, June, 2005 Flying Wire Geometry –Coral Christensen, June 2005