HRRL OTR Test Mar 3rd 2011

Preparation

JAI Camera Setup

Target in:

Target out:

Target in after shielded:

Objectives

Determined if the steering magnets of the gun are connected to power supply

1. Physically check looking at wires.

2. Change currents on the steering magnet, and observe position of the beam spot. If changes then, connected.

Tune beam using Linac optics only

Chad will tune up the beam using steering elements which are within the HRRL Linac only.

Determined if the OTR target is centered on the beam line

With all beam line magnets off, observe the beam spot at the OTR target. If the beam is centered on the OTR target, then OTR target MAY be centered on the beam line.

Polarization test

Insert a polarizer film. Take several picture for different orientations without changing beam properties.

Angel is measured with respect to:

Polarizer Angel	Iamge
File:Positrons OTR 3-3-2011 0Degrees.png	File:Positrons OTR 3-3-2011 90Degrees.png

Determined if the quads are centered on the beam line

The power supplies for ALL quads should be off.

Turn on Quad closesst to HRRL

If the beam deflects, try to align quad so there is no deflection

Turn on Quad closest to OTR target

If the beam deflects, try to align quad so there is no deflection

Run

Estimation of How Much off

Take at least 3 images for each setting below.

The goal is to estimate how far things may be misaligned. Several assumption will be made.

OTR Check bu Polarization

Before moving Camera

Take pictures at different time slices from the trigger.

This means take a picture and then delay the trigger pulse to the camera relative to the RF. Perhaps the light has a time structure.

Far field

Now return the camera trigger back to the original location in time. Focus at infinity and try to observe polarization.

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