The CLS is a 2.9 GeV storage ring with a 12 cell double bend achromat lattice. There are 12 straight sections of equal length. There are two bend magnets per cell and each one is a combined function magnet. One of the main features of a synchrotron storage ring are the number of straight sections (12), their parameters (Table 1), and how they are used (Table 2). The machine functions for a CLS cell and the lattice are show in Figures 1 and 2, respectively.

Storage Ring Parameters

Lattice Type: Double Bend Achromat
Beam Energy: 2.9 GeV
Periodicity: 12 cell
Circumference: 170.88 m
Beam current: 250 mA
Momentum Compaction: 0.0038
Straight Length: 5.2 m
Straight βx βy, ηx : 8.5m, 4.6m, 0.15m
Cavity Frequency: 500 MHz
Cavity Voltage: 2.4 MV
Harmonic number: 285
Horizontal emittance (εx): 18.1 nm-radian
Energy spread (ΔE/E): 0.00111
Bunch Length: 10 mm

The upstream accelerator complex is a 220 keV DC thermionic RF gun. A six section LINAC increases the beam energy from 220 keV to 250 MeV. An energy compression system (3 magnet chicane and RF cavity) compresses the relative beam energy spread by a factor of 10. The beam is then transported into a booster ring and ramped from 250 MeV to 2.9 GeV.

CLS Straight Filling

Straight Number




Injection straight

4 kicker bump


Electron beam diagnostic straight



Reserved for future use



Chicaned: In-vacuum undulator

In-vacuum wiggler

l=20 mm, L=1.582 m, Beff =1.049 T

l=80 mm, L=1.28 m, Bpeak =1.948 T


Superconducting wiggler

l=48 mm, L=0.624 m, Bpeak =4.3 T


Superconducting wiggler

l=33 mm, L=1.056 m, Bpeak = 2.2 T


Chicaned: In-vacuum undulator

Out-vacuum wiggler

l=18.6 mm, L=1.582 m, Beff =1.016 T

l=150 mm, L=1.638 m, Beff =2.103 T


In-vacuum undulator

l=20 mm, L=1.583 m, Beff =0.959 T


Single length dual period APPLE-II undulator

l=180 mm, L=3.834 m, Beff =0.697 T

l=55 mm, L=3.924 m, Beff =0.877 T


Chicaned APPLE-II undulators

l=75 mm, L=1.591 m, Beff =0 742 T

l=75 mm, L=1.591 m, Beff =0.742 T


Chicaned APPLE-II undulators

l=45 mm, L=1.189 m, Beff =0.843 T

l=185 mm, L=1.635 m, Beff =0.751 T


RF Cavity


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