1. SSR1 Cryomodule Development for PXIE - Alignment T. Nicol Decenber 6, 2011

2. SSR1 cryomodule development for PXIEPage 2 Requirements from the functional requirements specification Cavities Number, total8 Frequency, MHz325 b0.22 Operating temperature, K2 Operating modeCW Operating energy gain at b=0.22, MV/cavity2 Transverse cavity alignment, mm RMS<±1 Angular alignment, mrad RMS≤±10 Coupler type – standard coaxial with impedance, W 50 Coupler power rating, KW>20 Solenoids Number, total4 Operating temperature, K2 Current at maximum strength, A≤100 ∫B 2 dL, T 2 m6.2 Max. alignment error (center position), mm RMS ±0.5 Max alignment error (angle) mrad±1 Maximum fringe field at the cavity walls, mT10 Each solenoid has independent powering

3. SSR1 cryomodule development for PXIEPage 3 Wire Position Monitors

4. SSR1 cryomodule development for PXIEPage 4 WPM in ILC 1.3 GHz cryomodule

5. SSR1 cryomodule development for PXIEPage 5 WPM in ILC 1.3 GHz cryomodule

6. SSR1 cryomodule development for PXIEPage 6 WPM concept for FRIB

7. SSR1 cryomodule development for PXIEPage 7 WPM in ISAC cryomodule at TRIUMF

8. SSR1 cryomodule development for PXIEPage 8 Optical Systems

9. SSR1 cryomodule development for PXIEPage 9 Prototype alignment system for HINS solenoids TD I&C asked to develop alignment system for HINS solenoids –Track location of multiple solenoids in cryomodule of up to 8m during cool- down with overall accuracy of 300  m Conventional approach –Stretched wire  150 um resolution  Wire sag  Vibration Optical alignment –Fresnel plates used at SLAC –Commercial systems (Ontrak)

10. SSR1 cryomodule development for PXIEPage 10 Initial approach Design –Point a narrow laser beam at a corner reflector –If the corner reflector moves transversely to the incident beam, the reflected beam will also move Advantages –No active components inside pressure vessel –Can be constructed with off the shelf optical components Disadvantages –Requires components with very high parallelism –Optical components in radiation environment Results –Good resolution (  <21  m) –Significant barrel distortion

11. SSR1 cryomodule development for PXIEPage 11 Commercial system www.on-trak.com Design –Pellicle beam splitters –Position sensitive photodiode Advantages –Proven commercially available system –Range up to 300 m –Resolution down to 2  m possible Disadvantages –Active electronics in cryomodules Results –Pellicle beam splitter failed at LN 2 temperature

12. SSR1 cryomodule development for PXIEPage 12 Second prototype Design –Wire cross-hair target –Diffraction pattern used to identify beam center Advantages –No active components –Radiation hard Disadvantages –Beam center determination at long range? –Interference between multiple targets Results –Excellent resolution and linearity over 1.5 m baseline (  <6  m) –Uncertainties in scale

13. SSR1 cryomodule development for PXIEPage 13 Third prototype Design –Ball bearing target produces Poisson spot Advantages –Passive –Radiation hard –Long range possible Disadvantages –Interference between multiple targets Results –Good resolution and linearity (  <18  m) over 8m baseline

14. SSR1 cryomodule development for PXIEPage 14 Current plans Long term stability and target motion tracking –8 m baseline –7 targets –2” aperture –Monitor temperature and humidity Optical alignment possible with –20 um resolution and linearity –baselines of 8m or more

15. SSR1 cryomodule development for PXIEPage 15 Cryomodule assembly concept Heat exchanger and relief line Cryogenic feeds and controls RF input couplers Current lead assemblies Cavity vacuum pumpout Alignment viewports

16. SSR1 cryomodule development for PXIEPage 16 Other Poisson spot alignment studies First proposed by Lee Griffith at LBL in 1987 Studies for APS at Argonne –Horst Freidsam now at FNAL PPD Recent studies at DESY for XFEL –  = 12  m over 5m baseline http://www.slac.stanford.edu/econf/C06092511/papers/TH0 08.PDF http://www.slac.stanford.edu/econf/C8907312/papers/023. PDF http://www.slac.stanford.edu/econ f/C971013/papers/047.PDF