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EBTF Design Review Technical Meeting Group

Detailed notes from a technical meeting discussing design aspects and issues of the EMMA project, including laser beam transition tapers, mirror positions, power points, and more.

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EBTF Design Review Technical Meeting Group

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  1. EBTF Design ReviewTechnical Meeting Group Clive Hill 27th September 2011

  2. Notes from Meeting • Transition tapers for low impedance are required, therefore a transition taper is required before the window flange which will need slots to allow laser beam to pass. Continue with additional design work of the current scheme should show this. • 2.3mm nominal clearance between centre of laser beam and diameter 14.8mm gun aperture tube appears not to be enough. Laser beam may be 2mm diameter and it may be necessary for it to scan 3mm x 3mm square area of the cathode plate. Moving the mirror flange further down stream to increase clearance would extend the distance to the 1st quadrupole and also reduce the size of the electron beam aperture in the mirror region. • In the current scheme the positions o the BPM and WCM should be swapped. • It was agreed it was essential that a visit to LAL should be arranged asap to discuss the technical issues concerning the gun. • A single power point should be generated to show both the in-vacuum and out of vacuum mirror schemes. This should include slide which to summarise the advantages and disadvantages of the two schemes.

  3. In Vacuum Lightbox Design Ppot, YAG, H & V Slit Collomator Stripline BPM Bellows Bellows H & V Corrector Lightbox Valve Gun Solenoid WCM H & V Corrector Laser In

  4. In Vacuum Lightbox Design Ppot, YAG, H & V Slit Collomator Valve WCM Gun Solenoid H & V Corrector Lightbox Bellows H & V Corrector Stripline BPM Bellows 65mm 1235 mm

  5. Rigid gun support at cathode end In Vacuum Lightbox Design Strip line BPM 120 mm slot length

  6. In Vacuum Lightbox Design Tapered beam pipe with ø 6 mm holes for laser Mirror Laser path 1.4⁰ from hor. Shown 90⁰ out of position for clarity Beam impedance screens in bellows and valve Restriction due to 15mm aperture Beam impedance screen ø15mm aperture RF spring here or capacitance plate

  7. In Vacuum Lightbox Design Accurately machined mirror holder with 4 mirror positions– can be removed from chamber to assemble mirrors. kinematic mount – can adjust inside chamber Mirror OD 10mm ? Mirror thickness 2mm ? Laser path Shown 90⁰ out of position for clarity

  8. EMMA H&V Corrector

  9. Lightbox design with mirrors inside vacuum system Possible angular error in laser mirror position due to resolution of adjustment = 0.01° Possible error in cathode position due to resolution of gun adjustment = 0.02° Nominally 2.3mm distance between laser beam centre and tube id. At this position the laser beam translates 0.068mm for every 0.01° angular error of laser mirror Nominal angle of laser path laser mirror in vacuum Ø14.7m aperture tube 1.42° 1.4° 1.44° 217mm 538mm 610mm With 0.01° angular error of laser mirror and 0.02° angular error of cathode the distance between laser beam centre and tube id = 2.16mm Possible angle of reflected laser path due to error 0.01° in laser mirror and 0.02° in cathode Ø6 Holes for laser path

  10. Lightbox design with mirrors outside vacuum system Ppot, YAG, H & V Slit Collomator Stripline BPM H &V Corrector Laser mirrors H &V Corrector Valve WCM Gun Solenoid Laser Path Ion Pump ?

  11. Ppot, YAG, H & V Slit Collomator Lightbox design with mirrors outside vacuum system Laser entrance/exit window flange H & V Corrector Valve Gun Solenoid H & V Corrector WCM Stripline BPM Bellows Laser mirror Ø35mm chamber aperture Ø18mm chamber aperture Ø48mm chamber aperture 1235 mm

  12. Electron beam aperture Ø18mm Ø16mm laser port Lightbox design with mirrors outside vacuum system Aperture transition cone with slots for laser to pass Ø12.7mm x 3 thick laser mirror on adjustable mount

  13. 2.3mm clearance between laser beam centre and tube 1.4° Aperture transition cone with slots for laser to pass Ø12.7mm x 3 thick laser mirror on adjustable mount Ø16mm laser port Ø16mm laser port Ø12.7mm x 3 thick laser mirror on adjustable mount Ø18mm Electron beam aperture

  14. Window Flange 4 x standard mini conflat windows – aperture ø16 Braze in to standard kovar spinning Weld, kovar to st. st. Weld St. st. tube ? or st. st. cooled ? or copper cooled ? depending on mis –steer of electrons or laser beam heating ? Could the e-beam be mis-steered into a window ? 114 CF flange

  15. Lightbox design with mirrors outside vacuum system Adjustable laser mirror in atmosphere adjustment resolution = 0.01° (175µrad) Possible angular error in cathode position due to resolution of gun adjustment = 0.02° Nominally 2.3mm distance between laser beam centre and tube id. At this position the laser beam translates 0.125mm for every 0.01° angular error of laser mirror Possible angular error in laser trajectory due to resolution (0.01°) of laser mirror Ø14.7mm aperture tube Nominal angle of laser path 1.4° 1.42° 1.44° 217mm 938mm With 0.01° angular error of laser mirror and 0.02° angular error of cathode the distance between laser beam centre and tube id = 1.85mm Possible angle of reflected laser path due to error 0.01° in laser mirror and 0.02° in cathode

  16. Comparison of 2 designs

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