The main parameters of the electron beam in the storage ring are summarised below :

Filling pattern bunch

Uniform

16bunch

Single

Maximum current (mA) 
200

90

20

Lifetime (hours) 
75

9

6

Rms energy spread (%) 
0.11

0.12

0.22

Rms bunch length (ps) 
20

48

73

The main optics functions, electron beam sizes and divergences, at the various points are given below. For insertion device source points, the beta functions, dispersion, sizes and divergences are computed in the middle of the straight section. Two representative source points of bending magnet radiation have been selected corresponding to an angle of observation of 3 mrad (9 mrad) from the exit, they correspond to different fields. Electron beam profiles are Gaussian and the size and divergence are presented in terms of rms quantities. The associated fwhm sizes and divergences are 2.35 times larger. Beam sizes and divergences are given for the uniform filling modes and apply to almost all filling patterns, except the single bunch for which a slightly larger size and divergence is reached due to the increased energy spread of the electron beam.

Even ID section (ID2, ID6,...) 
Odd ID section (ID1, ID3,...) 
Bending Magnet (3mrad)

Bending Magnet (9mrad)


Field 
(T)

depends on ID

depends on ID

0.4

0.85

Horiz. Beta Functions 
(m)

35.2

0.5

1.41

0.99

Horiz. Dispersion 
(m)

0.137

0.037

0.061

0.045

Horiz. rms e beam size 
(µm)

402

59

100

77

Horiz. rms e divergence 
(µrad)

10.7

90

116

111

Vert. Beta Functions 
(m)

2.52

2.73

34.9

34.9

Vert. rms ebeam size 
(µm)

7.9

8.3

29.5

29.5

Vert rms e divergence 
(µrad)

3.2

3

0.85

0.85
