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| Subject | ： Re: SAD Update. V1.0.8.22.6b. Bug in EMIT. |
| Date | ： 2006/06/21(Wed) 17:50:02 |
| Contributor | ： K. Oide |
Dear Users,
1. The change in EMIT and Emittance[] by 1.0.8.22.3b caused a bug to make it impossible to calculate for a negative momentum compaction case, as the stable rf phase is always shifted around zero. Now it is so corrected as to make the shift valid only when its magnitude is less than pi/2.
> Dear Users,
>
> 1. Now the problem with effective voltage might be finally fixed. New variables at the MAIN level is newly defined:
>
> DTSYNCH: shift of the origin of z of the closed orbit. (default: 0)
> EFFVCRATIO: ratio of (effective voltage)/(Sum[VOLT_k,{k}]) (default: 1)
> PHICAV: shift of cavity phase when variation exists for cavities. (default: 0)
>
> These variables are set by EMIT and Emittance[]. In the case of TRPT, these values are reset to default.
>
> The effective voltage is defined by
>
> V_eff = Sqrt[(Sum[VOLT_k Cos[PHI_k],{k}])^2 + (Sum[VOLT_k Sin[PHI_k],{k}])^2]
>
> and
>
> PHICAV is chosen to satisfy
>
> {Cos[PHICAV], Sin[PHICAV]} == {Sum[VOLT_k Cos[PHI_k],{k}], Sum[VOLT_k Sin[PHI_k],{k}]}