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EuCARD-2 WP12 HZDR 16-17.04.2014

EuCARD-2 WP12 HZDR 16-17.04.2014. Sub-task 12.5.1: Pb photocathode deposition. Work package 12 – Task 12.5 photocathodes - Subtasks 12.5.1: Pb photocathode deposition & 12.5.2: Diamond a mplifier c athode (DAC) development

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EuCARD-2 WP12 HZDR 16-17.04.2014

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  1. EuCARD-2 WP12 HZDR 16-17.04.2014

  2. Sub-task 12.5.1: Pb photocathode deposition Work package 12 – Task 12.5 photocathodes - Subtasks 12.5.1: Pb photocathode deposition & 12.5.2: Diamond amplifier cathode (DAC) development Involved Institues: NCBJ Swierk, DESY Hamburg, HZB Berlin, HZDR Dresden projectstart: May 1, 2013 D12.9 Pb/Nbplugphotocathodemeasurementsandcharacterization. Report detailingtheverificationofPb/Nbplugphotocathodeperformanceatthe HZDR injector test facility

  3. Sub-task 12.5.2: Diamond Amplifier Cathode Development projectstart: May 1, 2013 D12.13 results of DAC implementation in SRF guns: Report detailing the performance verification of DAC photocathode cells at BNL and BESSY-II, defining implementation process into SRF gun structure. Collaboration of HZB and HZDR

  4. ELBE SRF-Gun.2 status SRF Gun.2 will be moved in accelerator hall during the Easter-Shutdown. new cavity old cavity SC solenoid ⇒ Bz,max = 449 mT (@10A) H.Vennekate, DPG2014

  5. Nb-Samples • Made of pure niobium rod, 2-types (puck, plug) • Polishing with diamond suspension, mean roughness 24 nm • Clean with iso-propanol in ultrasonic bath • blow with ionized N2 till particle free, packed in dry N2 Mirror like surface Shipped back after coating Puck form with Ø10mm

  6. Experimental setup Vacuum system: chamber and pumps, gauge, sample holder, anode, feed through, UV optical window Laser system: high intensity UV laser, scanner, power meter/diode measurement instruments: Keithley 6485, DC, power meter Anode cathode Test chamber

  7. UV laser for sample cleaning • UV 258 nm • 100 -500 kHz adjustable • Intensity adjustable, < 0.3 mJ/cm2 • High power cleaning • Low power for QE measurement Intensity profile of the UV output [I.Will, FEL06] Two channel laser for ELBE SRF Gun

  8. Plan of experiments 1. cleaning with high intensity UV laser 2. QE measurement 3. field emission measurement in HZB

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