Misalignment errors in PyAT

[elafmusa]

Dear all,

I want to insert a misalignment error to the quadrupole using PyAT
These are the only parameters that i have :
My question is how to control the misalignment errors in PyAT ?

Quadrupole(FamName, Length, Strength=0, **keywords)

Available keywords:
PolynomB straight multipoles
PolynomA skew multipoles
MaxOrder Number of desired multipoles
NumIntSteps Number of integration steps (default: 10)
FringeQuadEntrance 0: no fringe fiels effect (default)
1: Lee-Whiting's thin lens limit formula
2: elegant-like
FringeQuadExit
fringeIntM0 Integrals for FringeQuad method 2
fringeIntP0
KickAngle Correction deviation angles (H, V)

[lfarv]

The misalignment of a PyAT element is set by optional attributes:

• T1 and T2 for entrance and exit translations,
• R1 and R2 for entrance and exit rotation along the s axis (magnet tilt)

Though you can set these attributes manually, an easier way to do this is to use the shift_elem (for a single element) or set_shift (for a full set f elements) functions. And similarly, for tilts there are tilt_elem and set_tilt.

[elafmusa]

@lfarv Thank you, i tried it and it works, it seems that the pervious misalignment value is kept in memory. Is there a way with which i can reset the ring to the initial state ?

[lfarv]

The misalignment values are kept because they are part of the element. To reset, you may either use the same functions to set the values to zero, or delete the element attributes (del element.T1 and so on).

[elafmusa]

@lfarv Thank you for the clarification.