SLAC ARD Test Facilities Tor Raubenheimer February 9

SLAC ARD Test Facilities Tor Raubenheimer February 9 th, 2012

Test Facilities at SLAC • Accelerator Research requires R&D facilities • Development has a long timeline • Important to have facilities with different energy scales • Need to match problems to scale of facilities – High energy facilities for unique problems – Low energy facilities more flexible and faster turn-around – ASTA/CTF; NLCTA; FACET/ESTB; ITF/FACET-II – Test facilities are expensive • Even small facilities are expensive to operate and maintain • University participants require more of a user facility paradigm • Model for facility support is changing but is critical for future R&D – Need plan for development and funding of Test Facilities

Example: NLCTA beam physics R&D • Thz - Tunable, narrow band THz generation • AO - All-optical mapping of the e-beam longitudinal ph. sp. • OL - Linearization of the microbunching phase space with 2+ laser harmonics • SC amplifier – Study microbunching and space-chare • OAM-FEL - Efficient up-conversion of transverse mode in FEL to generate light modes with associated orbital angular momentum. • Echo-75 – use EEHG technique to generate 75 th harmonic • Technology demonstrations: cryo-undulator, rf undulator, …

Need a Plan • Very high level plan was developed which focused on ITF – ASTA and NLCTA have not been part of the future plans of the laboratory • Not clear that omission is entirely intentional – Good to have ambitious plans but very unclear messages to DOE and lab personnel • May be important to make choices but important to be realistic about funding and timescales • Many opportunities for future evolution: ASTA CTF; NLCTA ICS, UED or beam physics user facility • Loss of capability is largely not recoverable • I believe the breadth of test facilities has been critical for ARD and will continue to be so

High Brightness Injector Program Three Parallel Experimental Efforts Cathode Test Facility LCLS-II Injector ASTA Facility Incremental upgrade of Photocathode R&D aimed at LCLS-I with opportunity understanding LCLS lifetime for R&D during and damage issues commissioning Test rf gun modifications before installation in LCLS-I or II Longer term R&D aimed at high brightness cathodes with lower thermal e (coatings, smoothness, new materials) Combined HB program requires ~3 M/yr new funding Injector R&D Program NLCTA Facility Simulation and experimental program aimed at significant improvement in brightness Construction in ~2014 1) Design studies on rf and commissioning gun design, CSR microin ~2015 to study injector bunching and cathodes physics before LCLS-II 2) Rf gun development and operation testing at NLCTA in 2012 3) NLCTA R&D on injector beam physics