Calculations
The bragg angle and energy calculations used to perform the energy macro-motions are in following script:
HXRSnD/hxrsnd/bragg.py
Bragg Calculations
Both the angle and energy calculations were pulled from blutil and the
script should contain all the necessary components to perform the calculation.
- hxrsnd.bragg.bragg_angle(E=None, ID='Si', hkl=(2, 2, 0))[source]
Computes the Bragg angle (deg) of the specified material, reflection and photon energy.
- Parameters:
- Efloat, optional
Photon energy in eV or keV (default is LCLS value)
- IDstr, optional
Chemical fomula : 'Si'
- hlktuple, optional
The reflection : (2,2,0)
- Returns:
- two_thetafloat
Expected bragg angle
- hxrsnd.bragg.bragg_energy(theta, ID='Si', hkl=(2, 2, 0))[source]
Computes the photon energy that satisfies the Bragg condition of the specified material, reflection and theta angle.
- Parameters:
- thetafloat, optional
The scattering angle in degrees
- IDstr, optional
Chemical fomula : 'Si'
- hlktuple, optional
The reflection : (2,2,0)
- Returns:
- Efloat, optional
Photon energy in eV
Macro-motion Calculations
There are three functions that perform the same calculations used in for the macromotors. These were used to used to perform quick position verification.
- hxrsnd.bragg.snd_L(E1, E2, delay, gap=55)[source]
Calculates the theta angles of the towers and the delay length based on the desired energy and delay.
- Parameters:
- E1float
Energy of the delay branch in eV
- E2float
Energy of the channel-cut branch in eV
- delayfloat
Delay of the system in picoseconds
- gapfloat, optional
Distance between the channel-cut crystals
- Returns:
- theta_Lfloat
The necessary angle of the delay branch in degrees.
- theta_ccfloat
The necessary angle of the channel-cut branch in degrees.
- Lfloat
The necessary length of the delay crystals in mm.
- hxrsnd.bragg.snd_diag(E1, E2, delay, gap=55)[source]
Calculates the positions of the middle diagnostics of the system based on the inputted energy and delay.
- Parameters:
- E1float
Energy of the delay branch in eV
- E2float
Energy of the channel-cut branch in eV
- delayfloat
Delay of the system in picoseconds
- gapfloat, optional
Distance between the channel-cut crystals
- Returns:
- dd_xfloat
The necessary position of the middle delay diagnostic in mm
- dcc_xfloat
The necessary position of the middle channel-cut diagnostic in mm
- hxrsnd.bragg.snd_delay(E1, E2, L, gap=55)[source]
Calculates the delay of the system based on the inputted energies and the delay length.
- Parameters:
- E1float
Energy of the delay branch in eV
- E2float
Energy of the channel-cut branch in eV
- Lfloat
Position of the delay crystals in mm
- Returns:
- delayfloat
The delay of the system in picoseconds