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DC Photocathode Gun (JLAB)

Challenges of present technologies. DC Photocathode Gun (JLAB) Main challenge is vacuum preservation in the gun chamber and downstream beamline when running high CW currents (>10 mA CW) QE degradation by back-ion bombardment at currents ~100 mA CW will be studied

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DC Photocathode Gun (JLAB)

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  1. Challenges of present technologies • DC Photocathode Gun (JLAB) • Main challenge is vacuum preservation in the gun chamber and downstream beamline when running high CW currents (>10 mA CW) • QE degradation by back-ion bombardment at currents ~100 mA CW will be studied • Existing RF power technology needs scalability for accelerating 100 mA beam • Normal Conducting RF Gun (LANL, PITZ) • Main challenge is cooling (localized power densities > 120 W/cm2 for 5 MV/m) • Secondary challenge is lack of cavity tunability • SRF Gun (Rossendorf, BNL) • Early stages of development and testing. Low cathode QE requires non-existing laser powers in the UV for high average current. This is a limitation even for producing high peak current.

  2. Status • DC Photocathode Gun (JLAB-AES) • Demonstrated 9 mA CW • Scalable to 100 mA by increasing drive laser rep rate • Normal Conducting RF Gun (LANL-AES) • Thermal test will be performed next summer • SRF Gun • Lead cathode will be tested at DESY-BNL (Sekutowicz) • Niobium cathode tested. Obtained 2E-6 QE at 266 nm. Starting diamond cathode studies (BNL) • Integration and cathode (CsTe) studies in progress (Rossendorf)

  3. Drive laser status • Presently developing lasers ~25 W at 532 nm (JLAB, BNL) • LCLS, SPARC, BNL and Rossendorf are addressing peak power and pulse shaping at 266 nm

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