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SERA

PHIN. SERA. Fabrication of a photo-injector for the CTF3 accelerator and for the NEPAL test stand. WP 4 of the JRA2 PHIN. Status of the construction of RF guns 2. Status of the construction of the NEPAL beamline. PHIN. SERA. 1.Status of the construction of the CTF3 photo-injector.

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SERA

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  1. PHIN SERA Fabrication of a photo-injector for the CTF3 accelerator and for the NEPAL test stand WP 4 of the JRA2 PHIN • Status of the construction of RF guns • 2. Status of the construction of the NEPAL beamline

  2. PHIN SERA • 1.Status of the construction of the CTF3 photo-injector • Modification of the technical drawings of the gun upon a CERN request • due to the insertion of photo-cathode transfer chamber (August) • All the cooling channels in the gun had to be re-designed • Makes difficult to support the gun • Finalization of the technical drawings of the NEG envelop around the gun • Strong collaboration with CERN is mandatory since the NEG coating • is done there • => drawings almost finished

  3. PHIN SERA • Status of the construction of the CTF3 photo-injector • Modification of the magnetic design: 2 coils instead of 3 • No enough space for pumping with 3 coils With a laser gaussian pulse Solenoids ordered in June, one was modified in September taking into account the data of the CERN cooling system => Should be delivered by the end of this month

  4. PHIN SERA Fabrication of a photo-injector for the CTF3 accelerator and for the NEPAL test stand Bucking coil Ionic pump Focusing coil RF gun output Wave guide right

  5. PHIN SERA Fabrication of a photo-injector for the CTF3 accelerator and for the NEPAL test stand Modification from the initial drawing 1 Reduction of the cathode chamber 2 Migration of cooling pipes to the end of the gun

  6. PHIN SERA • Status of the construction of the CTF3 photo-injector Construction of a cold model to valid RF simulations • History: • Ordered in March a test piece to check : • iris profile • roughness • mechanical accuracy • Test cavity received in April • Iris profile not satisfying, another item O.K. • Several tries later, order in beginning of June, foreseen delay: 8 W • Last piece received in November 4 th • (the firm begins (we suspect) the work only in October) • Checking at LAL: • general accuracy: 5 mm, roughness: < 0,4 mmRa , iris profile O.K. Set up of the RF measurement apparatus begun the 14th Duration: 2 months but we hope to order the final gun before the end of the year

  7. PHIN SERA • Status of the construction of the CTF3 photo-injector Coupling aperture (before opening)

  8. PHIN SERA • Status of the construction of the CTF3 photo-injector First half cavity with the hole for the photo-cathode Central cavity Last cavity with coupling holes Cooling channels

  9. PHIN SERA • Status of the construction of the CTF3 photo-injector Holes for NEG pumping

  10. PHIN SERA 2. Status of the construction of the NEPAL beam line Laser : Ordered in July Expected at LAL in the end of this year Preparation chamber : In progress in the LAL workshop Beam-line : A possible design exist A lot of drawing elements are readies The final studies are in expectation (lack of manpower)

  11. PHIN SERA Fabrication of a photo-injector for the CTF3 accelerator and for the NEPAL test stand Short term program • RF measurements on the cold model • final dimensions of cells and coupling holes • 2. Ordered in December the two RF guns • with a reserve on the final inner dimensions • 3. NEG deposition • Test of compatibility of SS/NEG (CERN specialists request) • in the beginning of 06 • First laser tests • end of this year

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