A Beam Halo Monitor Based on Adaptive Optics. Courtesy of Dr Carsten P. Welsch AB/BI/PM
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1 A Beam Halo Monitor Based on Adaptive Optics Courtesy of Dr Carsten P. Welsch AB/BI/PM
2 Outline 1. Beam Halo Measurements Whydowecare? How to do the measurement? Introduction to CID technology 2. Core-masking Technique The idea Initial tests fixed mask DLP Technology (MMA) Results from Tests
3 Definition: What is 'Halo'? General definition difficult to make: Accelerator physicists Instrumentation specialists Low density / difficult to measure
4 Halo: Why do we care? Less transmission, more radiation Ati Activation of vacuum chamber Maintenance more difficult Higher cost Different reasons Dispersion Mismatch Scattering (beam - gas, intra-beam, Touschek) Noise Space charge... Goal: Understand mechanisms!
5 OTR characteristics Created when charged particles pass through the interface between two materials with different permittivity. OTR Backward emission (θ) (φ) Specular reflection
6 A Brief (incomplete) Comparison OTR SR + + Screen choice Non-destructive Linear, directive Signal Highly directive Fast time response Good signal if E~150 MeV Add. Info (ε, x, y,..) Destructive Installation/Maintenance Max. beam charge Only in bends or chicane Alignment of line Diffraction limited
7 Halo Monitor Under investigation: 2D PMT setup SpectraCAM CID camera Micro Mirror Array Meas. Sci. Technol. 17 (2006)
8 Non-destructive read-out Row Column Steps: Determine sense voltage ΔV Transfer charges to RE Continue integration or Inject charges to substrate Substrate
9 Halo Measurements Meas. Sci. Technol. 17 (2006)
10 SOHO * Solar and Heliospheric Observatory
11 Lab Setup optical system 2 mask (image plane 1) filter wheel Mask: spot printed on polyesther foil CCD camera (image plane 2) optical system 1 On / Off (beam core) OTR light Proc. EPAC04
12 Calibration: Opacity Phantom image without mask Phantom image with mask am mplitude [a.u ] amplitude with mask amplitude without mask Proc. EPAC04 horizontal position [mm] Factor 100 higher dynamic range.
![u ] 7000 6500 6000 5500 5000 4500 4000 3500 3000 2500 2000 1500 1000 500 0](/docs-images/45/850823/images/page_12.jpg "amplitude with mask amplitude without mask -8-7 -6-5 -4-3 -2-1 0 1 2 3")
13 Micro Mirror Array Micro Electro-Mechanical device 1024 x 768 pixels (XGA) USB Interface high-speed port 120 MHz for data transfer up to full array mirror patterns / sec (7.6 Gbs) 16 μm insize +/- 10 of rotation Switch of 15 μs physically, 2 μs optically
14 Performance Test and More Camera Filter Wheel Light source MMA
15 Measurement (1) Aquire profile (2) Define core (4) Re-Measure (3) Generate mask
16 Results from Measurements 1,0E+00 Position [μm] Normalized I ntensity 1,0E-01 1,0E-02 1,0E-03 1,0E-04 Masked region SpectraCAM 600s DMD CCD Camera, OD4 10E-05 1,0E 05 1,0E-06
17 Next Steps Test MMA setup in running machine Improve Software / automate process Adapt to new Test Beam Line Combine with CID camera?
18 Conclusion Understanding of beam halo of central importance for future accelerators CID camera provided high-dynamic range measurements to 10 6 level MMA as central element of future halo monitor
19 A i t Thanks to Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian L h Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, Erminio Rugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick Amiot, Cathelijne Bal, Enrico Bravin, Stephane Burger,, Christian Dutriat, Morad Hamani, Phillippe Lavanchy, Thibaut Lefèvre, Romain Ruffieux, ErminioRugo, Guy Yvon, Patrick
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