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| Subject | ： SAD Update. V1.0.10.4a01 Bug in EMIT, etc. |
| Date | ： 2010/01/16(Sat) 11:35:05 |
| Contributor | ： K. Oide |
Dear Users:
1. It was found that the routine in the emittance calculation has not taken the momentum closed orbit into account in the estimation of the quantum excitation of the momentum beam matrix, i.e. <px^2>, {px py>, <px p>, etc. Thus the error becomes huge when the momentum closed orbit (i.e. orbit angle) is large as in a solenoid with orbit angle. This bug has been there almost from the beginning of the emittance calculation in SAD, probably around 1988. This bug only affects EMIT and Emittance[] and has no effect in optics calculation or tracking with radiation.
2. Now APERT takes keywords AX, AY, DX, DY to scrape particles with the condition
(x - DX)^2/AX^2 + (y - DY)^2/AY^2 >= 1 .
If either AX == 0 or AY ==0 (default), the scraping with AX, AY is not effective. If both AX and AY are nonzero, then scraping with DX1, DX2, DY1, DY2 are ineffective when DX1==DX2 or DY1==DY2.
3. Now an APERT element can be inserted in a solenoid region.