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STATUS OF OTR IMAGER FOR THE LCLS UNDULATOR

STATUS OF OTR IMAGER FOR THE LCLS UNDULATOR. Bingxin Yang, Jim Bailey, and Dean Walters Advanced Photon Source. OTR Imager Status. Specifications and designs LCLS PSD 1.4–004 (cancelled) LCLS ESD 1.4–109 LCLS Tech Note LCLS-TN-05-21 (most complete)

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STATUS OF OTR IMAGER FOR THE LCLS UNDULATOR

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  1. STATUS OF OTR IMAGER FOR THE LCLS UNDULATOR Bingxin Yang, Jim Bailey, and Dean Walters Advanced Photon Source

  2. OTR Imager Status Specifications and designs • LCLS PSD 1.4–004 (cancelled) • LCLS ESD 1.4–109 • LCLS Tech Note LCLS-TN-05-21 (most complete) • PAC 05, “Design of a high-resolution optical transition radiation imager for the linac coherent light source undulator,” by B.X. Yang, J. L. Bailey, D. R. Walters, and S. J. Stein. Outline • Basic design features of the OTR imager • Current status • Future?

  3. OTR imager specification Basic requirements: • RMS resolution: 12 mm • Total field of view: 10 mm (H)  5 mm (V) • Single shot imaging (1 nC @ 13.64 GeV) desirable

  4. OTR imager optics geometry Design features to obtain good resolution and large field of view simultaneously : (1) Use near normal incidence angle (2) Tilt CCD camera* to coincide with the tilted image plane. * CCD camera manufacturer specifies maximum tilt angle allowed.

  5. OTR imager optics calculation: perfect optics Specifications without aberrations: • Collection cone angle radius: 0.075 radian • Diffraction contribution to resolution: 3.2 – 5.6 mm (400 – 700 nm) Collection efficiency Radial distribution Integrated profile

  6. OTR imager optics calculation: aberrations Ray tracing studies for aberrations: • Commercial achromat lenses (M = 1) • Spherical aberrations unimportant • Chromatic aberrations dominant contribution • Use laser mirrors as bandpass filters to improve efficiency

  7. OTR imager mechanical design: partially assembled Design Parts

  8. OTR imager intended location: long break sections

  9. Summary and future Summary • Parts are received and partially assembled • To be tested • Verify resolution • Check resolution over the entire FOV • Use this package at a different location in LCLS linac? to be studied… • Biggest issue: camera and controls

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