7 Design and Principles of Linear Accelerators and Colliders
331
Table 7.8
Comparison of selected present and future generation ERLs
JLab ERLs
S-DALINAC
bERLinPro
CBETA
PERLE
Gun technology
DC
Thermionic
SRF
DC
DC
Total # passes
2
2
2
8
6
Recirculation architecture
Conventional
Conventional
Conventional
FFG
Conventional
Acceleration/recovery multipass transport
Linac only
Linac only
Linac only
Common
Common
RF frequency (GHz)
1.5
3
1.3
1.3
0.8
Nominal bunch charge (pC)
135
Very low
77
77
320
Design current (mA)
10
Very low
100
40
20
Total current in linac (mA)
9.1
Very low
200
320
120
Energy (GeV)
0.165
~0.0425
~0.05
~0.15
0.5–1
Beam power (MW)
1.25 (>>P
RF )
Low ( RF )
10 (>>P
RF )
6 (>>P
RF )
10–20 (>>P
RF )
Energy at dump (MeV)
11
2.5
5
5
5
E
full /E
dump
15–20
17
10
30
100–200