# CRL

## Function

To calculate the parameters of Compound Refractive Lenses (CRL).

Two kind of calculations are allowed:

1. main parameters (focal distances, gain, acceptance, etc.) (calculated using Refs. 1 & 2)

2. Pseudo-Ray-Tracing to compute the beam profile at the image plane and the phase-space plot. (calculated using Ref. 2, formulas 9 and 32 for cylindrical and parabolic lenses, respectively).

## Documentation

- application doc

- input parameters

## Technical aspects

- Numerical calculations are done using the IDL functions crl_calc_rt

## References

1. Snigirev, V. Kohn, I. Snigireva, A. Souvorov and B. Lengeler: "Focusing High Energy X-rays by Compound Refractive Lenses", Applied Optics 37 (1998) pp. 653-662)

2. P. Elleaume: Nucl. Instrum. and Meth. in Phys. Research A 412 (1998) pp. 483-506