Difference between revisions of "HRRL OTR Test Mar 3rd 2011"
| Line 230: | Line 230: | ||
== OTR Check Polarization== | == OTR Check Polarization== | ||
| − | + | == Time Slice Study of the OTR == | |
Take pictures at different time slices from the trigger. | Take pictures at different time slices from the trigger. | ||
| Line 241: | Line 241: | ||
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_0.5ns.jpg | 300 px]] | [[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_0.5ns.jpg | 300 px]] | ||
| − | |||
=== Far field=== | === Far field=== | ||
Revision as of 21:57, 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
Peak Current (mA): 160
Rep Rate (Hz): 6
Pulse width (ns): 200
HV on, Filament on, RF on
HV off, Filament on, RF on
HV off, Filament on, RF off
HV on, Filament on, RF off
HV on, Filament on, RF on, Valve closed
HV off, Filament on, RF on, Valve closed
HV on, Filament on, RF off, Valve closed
HV off, Filament on, RF off, Valve closed
Estimation of How Much off
Rep Rate (Hz): 6
Pulse width (ns): 200
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 to FC Just by steering Magnets
Peak Current (mA): 160
Tuned for Max transmision to FC by using quads and steering Magnets
Using 1st Triplets
Peak Current (mA): 160
Using 2nd Triplets
Peak Current (mA): 160
Using Both Triplets
Peak Current (mA): 160
Tuned for Min Quad deflection
Find the spot that when we change quad currents, center of the beam spot does not change or change the lest.
Rep Rate (Hz): 6
Pulse width (ns): 200
Quqads off
Peak Current (mA): 35
Quads off:
1st quad of the 1st triplet on
1st quad of the 1st triplet power supply at (A): 2
1st quad of the 1st triplet power supply at (A): 4
1st quad of the 1st triplet power supply at (A): 6
1st quad of the 1st triplet power supply at (A): 8
1st quad of the 1st triplet power supply at (A): 10
2nd quad of the 1st triplet on
2nd quad of the 1st triplet power supply at (A): 2
2nd quad of the 1st triplet power supply at (A): 4
2nd quad of the 1st triplet power supply at (A): 6
2nd quad of the 1st triplet power supply at (A): 8
2nd quad of the 1st triplet power supply at (A): 10
Tune on center of Target
Rep Rate (Hz): 6 Pulse width (ns): 200 Peak Current (mA): 120
Tuned on center of the target:
Rf on, HV off (for back ground subtraction):
No beam, light is on:
OTR Check Polarization
Time Slice Study of the OTR
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