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Phone: +41 56 310 4593
Updated: 09.09.2015
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FOFB Properties
The fast orbit feedback system (FOFB system) is based on a linear
model of the SLS storage ring. The 72x72 orbit response matrix A
maps the corrector magnet settings to the beam position monitor readings.
The singular value decompostion algorithm (SVD) is used to invert the 72x72
correlation matrix. The orbit differences from a design orbit are expressed
by a vector 
while the applied corrector change is denoted by the vector 
.
= A-1
The
inverted response matrix is of the dimension 72x72 and is further subdivided
into submatrices (6x6) corresponding to the different 12 sectors.
Each DBPM station requires the submatrix An,n for its own BPM readings and the submatrices for the BPM readings from the adjacent sectors An,n-1 and An,n+1. Inverted response matrices are defined for both planes X and Y. The property naming convention for the different BPM sectors is defined as:
sector i: 
where $(PLANE) stands for either X or Y.
Alternatively, each row of the submatrices can be addressed individually. The above properties are extended by the row number:
row m of submatrix Ai,j : MATR-$(PLANE)-NM1Rm
where m=[1,6]
Operator Properties
FOFB Sector Properties
The parameters are:
$(PLANE): X, Y
$(SEC-N): N -> sector N
NM1 -> sector (N-1)
NP1 -> sector (N+1)
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valid planes are X, Y, valid sectors are NM1 (stands for sector (n-1)) N (stands for sector (n)) NP1 (stands for sector (n+1)) |
array of floating-point (6x6 matrix) |
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valid planes are X, Y, valid sectors are NM2 (stands for sector (n-2)) NP2 (stands for sector (n+2)) |
array of floating-point (6x6 matrix) |
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valid planes are: X, Y, valid sectors are: NM1 (stands for sector (n-1)) N (stands for sector (n)) NP1 (stands for sector (n+1)), valid rows are: m=[1,6] |
array of floating-point (1x6) |
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valid planes are X, Y, valid sectors are NM2 (stands for sector (n-2)) NM1 (stands for sector (n-1)) N (stands for sector (n)) NP1 (stands for sector (n+1)) NP2 (stands for sector (n+2)) |
array of floating-point (6x6 matrix) |
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state 0: off state 1: link_up state2: link_ready |
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integer |
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integer |
FOFB BPM Properties
The parameters are:
$(PLANE): X, Y
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floating-point |
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FOFB Corrector Magnet Properties
The parameters are:
$(PLANE): X, Y
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(1st half of 8k buffer) |
array of floating-point (4080 elements) |
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(2nd half of 8k buffer) |
(1st half of 8k buffer) |
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default: off |
write: bo record,
ZNAM: off |
FOFB Global Properties
The global properties (settings) are distributed to the individual sectors. Those settings are hirarchical:| (global property) | -> (sector 1 property) |
| -> (sector x property) | |
| -> (sector 12 property) | |
Global properties overwrite sector properties. Nevertheless, local settings can be made. They are set until the next global setting will be made.
The global properties are
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Expert Properties
FOFB Global Properties
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FOFB Sector Properties
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Appendix
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Author: Thomas Schilcher Phone: +41 56 310 4593 Updated: 09.09.2015