1. Electron mode A B C D > 4 GeV e- θ g e- DR α PS
GUN
SHB
L GeV
5.7 GeV
0.1GeV
0.8 GeV
≈ 70 m.
≈ 320 m. PS
≈ 60 m.
Linac B turned down to 2.7 GeV.
Low charge e bunches injected in DR with the pulsed a and, the same time,
damped e bunches are extracted with the pulsed g and accelerated to 4 GeV.
3) e bunches pass off-axis (≈ 1mm), through a target hole.
Legend
e low charge electron bunches
p positron bunches
E high charge electron bunches

2. Positron mode A B C D θ > 7 GeV e+ β PS e+ DR
GUN
SHB
L GeV
5.7 GeV
0.1GeV
0.8 GeV
> 7 GeV e+
≈ 70 m. PS
≈ 60 m.
≈ 320 m.
e+ DR
≈ 400 m.
1) Linac B turned up to 5.7 GeV.
2) Linac C is aligned with emerging, low-energy p.
3) Dampep p bunches are extracted from pDR, injected in the linac with the DC dipole b and
accelerated along linacs B-C-D, up to 7 GeV. The p bunches pass through a target hole.
4) Dampep p bunches may not be extracted after the arrival of the recirculated p’s because the RF sections,
meanwhile, are switched-off.
5) High charge E- bunches are generated about 70 nsec behind the p bunches and accelerated by linac A.
6) E- bunches are injected in the linac B, with the DC dipole b, are accelerated, together with the p’s, and finally
hit the target.
7) Emerging p bunches are accelerated to 0.8 GeV by linacs C-D and recirculated back to the pDR.
Legend
e low charge electron bunches
p positron bunches
E high charge electron bunches

3. Linac C Linac B P.S. area close-up view PS new linac axis l d
Pulsed
Focusing
coil
Linac C
new linac axis l d
Linac B
Pulsed
dipoles PS
Here, a pulsed device must
re-position the damped bunches
on the center line
The PS area concerns the operation of 3 type of bunches:
Low charge damped electron bunches: must travel through the PS-hole
High charge Electron bunches: must hit the PS bulk.
……Low energy positron bunches follow along a straigth trajectory.
Low charge damped positron bunches: must travel through the PS-hole
Both e and p damped bunches pass through the same PS-hole, thanks to the pulsed dipoles l and d.

4. A B C D DIPOLES Timing ------ 1) dipole α and g…. on-off @ 50 Hz
2) dipole β and q… DC dipoles
4) dipoles l and d ….. Pulsed inverted 50 Hz
e- DR A R B C D θ α β g
GUN
SHB
L GeV
5.7 GeV
0.1GeV
0.8 GeV
> 7 GeV e+
≈ 70 m.
≈ 60 m.
≈ 320 m. PS
e+ DR
≈ 400 m.