E163: Laser Acceleration at the NLCTA Eric Colby, ARDB For the E163 collaboration Safety Overview Committee Meeting Sept. 19, 2002

Summary of E163 Science Goals Ultimate goal: demonstrate technical feasibility of direct laser acceleration –Proof-of-principle experiment (Q1 2005) –Construct optical prebuncher and conduct staging experiments (Q4 2005) –Test lithographically fabricated multicell accelerator structures (early 2006 on)

E163 Infrastructure The NLCTA is the centerpiece E163 adds: –An RF photoinjector replacing the NLCTA injector –A laser and laser room –An S-band rf system similar to a klystron gallery station –A shielding enclosure adjacent to and connected to the NLCTA enclosure –An extraction beamline leading out of the NLCTA into this enclosure –A control room outside ESB (move 225 to Northeast corner of ESB)

E163 Shielding Enclosure

Some ES&H Issues Radiation shielding enclosure suitable for: –10 Hz x 70 MeV x 1 nC beam –Occupation when the NLCTA enclosure itself is secured and the NLCTA is operating –Multiple penetrations into the NLCTA shielding enclosure for laser light and electron beam Earthquake Hazards –Radiation shielding enclosure, modification to block wall at east end of ESB –Klystron mounting

Class IV laser (Ti:Sapphire+harmonics) –UV light up to 0.1 mJ per pulse present in both the laser room and NLCTA enclosure under normal operating conditions –IR light up to 1 mJ per pulse present in both the laser room and E163 shielding enclosure under normal operating conditions Electrical hazards –HVPS, modulator, klystron –Rf radiation –Misc. power supplies for magnets, ion pumps, etc. Chemicals, gases, etc. –Small quantities of cleaning solvents for vacuum preparation (IPA, acetone, etc.) ES&H Issues, continued