Disclosed are reticle assemblies for use in electron-beam microlithography. The refrigerant cycle is also provided with a common economizer circuit for all tandem compressors. In this way, a small portion of the projectile’s kinetic energy is converted into electrical energy. Preferably, the tape head includes a plurality of alignment elements. As the account balance gets low, the local risk management module may query the central risk controller for the additional risk account balance. The method also includes automatically switching off, when one or more GPUs is in an idle state during the window of time, power to the one or more GPUs to transition the one or more GPUs into a quiescent state of zero power utilization thereof.