TUXD5
LANL, Los Alamos, New Mexico, USA
MSU, East Lansing, Michigan, USA
Proton radiography is a powerful diagnostics technique that is capable of resolving ultra-fast processes on the ns scale in dense matter with micrometer spatial resolution. This unique performance is realized by the use of a chromatic imaging system, which consists of four quadrupole lenses [1]. Chromatic imaging systems have a mono-energetic focal length. That means, if a target with areas of different energy losses is to be investigated, it is only possible to focus on one proton energy leaving other areas of interest blurred. A simple method of focusing multiple energies at once and thus increasing the depth-of-field is the use of multiple detector stations along the beam axis. Proton images captured at downstream detector positions can be combined into a single image using a method called ’focus stacking’. A complete cancellation of the position- and energy dependent 2nd order chromatic aberrations that mostly affect the current image quality of pRad [2] is only possible by using an achromatic imaging system. Following the proposals in early design studies at LANSCE [3] a new prototype achromatic system is currently being developed for a 25 MeV S-band electron accelerator.
*LA-UR-22-24725
[1] N. King, et al., Nucl. Instr. and Meth. in Phys. Res. A, Vol 424, 1999
[2] F.E. Merrill, Rev. of Acc. Sci. and Tech. Vol 8, 2015
[3] B. Blind, A.J. Jason, Proc. of PAC, 2005
PSI, Villigen PSI, Switzerland
We perform beamline design optimization for the High Intensity Muon Beams (HIMB) project at the Paul Scherrer Institute (PSI), which will deliver muon beams at the unprecedented rate of 1·1010 muons/s to next-generation intensity frontier particle physics and material science experiments. For optimization of the design and operational parameters to maximize the beamline transmission, we use the asynchronous Bayesian optimization package DeepHyper and a custom build of G4beamline with variance reduction and measured cross sections. We minimize the beam spot size at the final foci using a COSY INFINITY model with differential-algebraic system knobs, where we minimize the respective transfer map elements using the Levenberg-Marquardt and simulated annealing optimizers. We obtained a transmission of 1.34·1010 muons/s in a G4beamline model of HIMB’s MUH2 beamline into the experimental area.