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Future Cold BPMs at DESY

Future Cold BPMs at DESY. D. Nölle, MDI 1.12.06. One injector initially installed. Connection to 2 nd stage upgrade included in beam distribution layout. Motivation: X-FEL. Superconducting 20 GeV LINAC With 120 Cryomodules. Properties of XFEL radiation.

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Future Cold BPMs at DESY

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  1. Future Cold BPMs at DESY D. Nölle, MDI 1.12.06

  2. One injector initially installed Connection to 2nd stage upgrade included in beam distribution layout Motivation: X-FEL Superconducting 20 GeV LINAC With 120 Cryomodules

  3. Properties of XFEL radiation • X-ray FEL radiation (0.2 - 14.4 keV) • ultrashort pulse duration <100 fs (rms) • extreme pulse intensities 1012-1014 ph • coherent radiation x109 • average brilliance x104 • Spontaneous radiation (20-100 keV) • ultrashort pulse duration <100 fs (rms) • high brilliance Goal 30.000 Pulses/s

  4. Just for Info: Accelerator Layout Parm’s 1) The limitation to 3,000 bunches at 20 GeV beam energy is related to a maximum load of 300 kW on each of the beam dumps in the initially installed two electron beam lines.

  5. 3.4km Overall layout and site

  6. Schenefeld Site

  7. Schedule

  8. XFEL Cryo Module • BPMs are the only monitor installed • In the 1.2 km long main LINAC • They sit every 12 m at the end of • the cavity string together with • Quadrupole • Steerer pair • HOM Absorber

  9. HOM absorber bellows BPM quadrupole gate valve In More Detail • Cold BPM with well defined „Interface“ • Resolution < 50 µm, single Bunch (RMS) @ 0.3 – 1.2 nC, circular shaped beam • Coupling x/y < 1 % • Particle Free, at least to Class 100 • Beampipe 78 mm, stainless, copper plated • Length 170 mm • „Cavity Fanges2, fixed type on both sides • Fixed directly to the cold quad • Tolerances (Electrical to magnetical axis) • 300 µm (RMS) Transversal • 3 mrad (RMS) Roll angle

  10. Two Candiates for the Cold BPM Pick-up Reentrant • Two Prototypes are installed in TTF, close to each other • DESY Pick up: First Tests with „Neumann Electronics“ • CEA Reentrant: • Installed, first RF Tests • Beam Test in the next Accelerator Physics Period of TTF TTF Installation

  11. Pickup „Prototype“ • Needs more Investigation of • Button Size/Geometrie • Feedthrough Technology • Beam Tests have shown Resolution better 50 µm @ 1 nC

  12. Q = 0.5 nC y Hor. Beam Postion x Calc. Steerer Kick First Beam Measurements: 13ACC7 with modified HERA Electronics • Prototype electronics using the Delay Line Principle • Peak Detektor sampled with an 81 MHz VME ADC with DOOCS integration • SB BPM Resolution @ 0.9 nC: 25 µm • (measured using correlation techniques)

  13. Reentrant Cavity BPM Already presented by Claire • Collaboration with CEA Saclay • Potential of much higher resolution (< 10 µm) • Mechanics more complicated • Cleaning for particle cleanness more problematic. • Possible BPM for ILC ?

  14. wakefield spectrum Higher Order Modes (HOM) in Accelerating Cavities • other modes: Higher Order Modes (HOM) • excited by the electron beam (unavoidable) • monopole, dipole, quadrupole etc. modes • Need to be damped • Why not use them as Cavity BPMs • All Cavities have HOM Couplers • Potential for sub µm Resolution

  15. The end

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