The LEAF picosecond pulse radiolysis facility at Brookhaven National Laboratory

Abstract

Development of high-voltage pulse-slicer unit with variable pulse duration for pulse radiolysis system Rev. Sci. Instrum. 83, 024709 (2012); 10.1063/1.3685245 The Brookhaven National Laboratory electron beam ion source for RHICa) Rev. Sci. Instrum. 81, 02A509 (2010); 10.1063/1.3292937 Double-decker femtosecond electron beam accelerator for pulse radiolysis Rev. Sci. Instrum. 77, 043302 (2006);The BNL Laser-Electron Accelerator Facility (LEAF) uses a laser-pulsed photocathode, radio-frequency electron gun to generate ജ7 ps pulses of 8.7 MeV electrons for pulse radiolysis experiments. The compact and operationally simple accelerator system includes synchronized laser pulses that can be used to probe or excite the electron-pulsed samples to examine the dynamics and reactivity of chemical species on the picosecond time scale.

Water Radiolysis: Influence of Oxide Surfaces on H2 Production under Ionizing Radiation

“…In 1960, pulse radiolysis facilities had a time resolution of the order of the microsecond [19]. The time resolution was then lowered to the nanosecond [32] and then picosecond time scale [33][34][35][36][37][38]. Among the species to be studied, the hydrated electron [39][40][41][42] and the  OH radical [43] have received most attention.…”

Ultrafast pulse radiolysis using a terawatt laser wakefield accelerator

“…21 Recently, new types of electron accelerators based on laser-driven photocathode linacs have been specifically developed for radiation chemistry. [22][23][24][25][26][27] At Osaka University scientists have produced single electron bunches that are less than 100 fs in duration (at 32 MeV) using a photocathode linac. 24,28 Despite the ultrashort bunch lengths produced with this new generation of accelerators the best time resolution attainable for transient absorption pulse radiolysis experiments is typically 4-10 ps.…”

Practical considerations for high spatial and temporal resolution dynamic transmission electron microscopy

“…The main approaches to mitigating this current limit in future DTEM designs are the same as have been developed for other high brightness electron sources [25,26]: increase the electric field at the surface and decrease the acceleration gap. This may involve a shorter electron gun, a higher extraction field near the cathode, an RF accelerator [26], or eventually very advanced solutions like the use of a cooled gas to emit an ultracold gas of electrons [21]. Ultimately, the electron gun must generate both high peak current and high beam quality [27].…”