Difference between revisions of "HRRL OTR Test Mar 3rd 2011"
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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. | 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. | ||
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| + | === Far field=== | ||
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| + | Now return the camera trigger back to the original location in time. Focus at infinity and try to observe polarization. | ||
Back to [[Positrons]] | Back to [[Positrons]] | ||
Revision as of 20:10, 3 March 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 |
| 200 px | 200 px |
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
Field Emission Check
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.
Tuned for Max transmision toFC
Tuned for Min Quad deflection
Tune on center of Target
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.
Back to Positrons