E-Bends

Info

The E-Bends consist of two pairs of electrostatic plates with each plate having its own separate power supply.

The E-bends are responsible for bending the beam by 90 degrees two times.

First bend: beam goes from ULEBT section down into the VLEBT section.

Second bend: beam goes from the VLEBT section and into the linac tunnel.

The plates of the E-Bends are inside the beam line.

In each pair, one plate is called the 'inner' plate while the other is called 'outer' plate. This is because the beam is bent in a circular fashion. So, one plate is near the inner radius of the bend while the other is near the outer radius.

The E-Bends serve as beam inhibit devices as they ultimately determine whether or not beam can be sent into the linac tunnel to be accelerated.

The plates are individually connected to a HV relay that prevents the plates from being charged from beam impact when the E-Bends' power supplies are turned off. These relays provide grounding; no charge accumulation can occur from beam impact on the plates that would otherwise cause inadvertent beam deflection into the linac tunnel.

Since the E-Bends act as beam inhibit devices, their power supplies are tied to the PPS.

The Linac RSS system of the PPS must be in 'Beam Permit' before the PPS will allow the E-Bends' power supplies to be turned on.

If 'Beam Permit' is lost while the E-Bends are on, the PPS will quickly ground each of the plates and turn off their power supplies.

Tips/Notes

Location

The E-Bends are located at the top and bottom of the VLEBT section of the beamline.

Diagram of the Front End. The E-Bends are located at the top and bottom of the VLEBT section.

Devices/PV's

Unordered List Item

Personnel