Difference between revisions of "HRRL OTR Test Mar 3rd 2011"

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(Created page with '= 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,…')
 
 
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 +
= Preparation =
 +
 +
== JAI Camera Setup ==
 +
 +
 +
Target in:
 +
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_JAI_Camera_Setup_1.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_JAI_Camera_Setup_2.jpg | 300 px]]
 +
 +
 +
Target out:
 +
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_JAI_Camera_Setup_Target_Out_1.jpg | 300 px]]
 +
 +
 +
Target in after shielded:
 +
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_JAI_Camera_Setup_shielded_target_in_1.jpg | 300 px]]
 +
 
= Objectives =
 
= Objectives =
 
== Determined if the steering magnets of the gun are connected to power supply ==
 
== Determined if the steering magnets of the gun are connected to power supply ==
 
1. Physically check looking at wires.  
 
1. Physically check looking at wires.  
 +
 
2. Change currents on the steering magnet, and observe position of the beam spot. If changes then, connected.
 
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 ==
 
== Determined if the OTR target is centered on the beam line ==
−
Turn of the all the power supplies for the magnets (include gun steering magnets), then observe beam spot at the OTR target. If the beam is centered on the OTR target, then 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:
 +
 
 +
{| border="3"  cellpadding="20" cellspacing="0"
 +
| Polarizer Angel||  Iamge
 +
|-
 +
|[[File:Positrons_OTR_3-3-2011_0Degrees.png | 200 px]] ||[[File:Positrons_OTR_3-3-2011_90Degrees.png  | 200 px]]
 +
|-
 +
|}
  
 
== Determined if the quads are centered on the beam line ==
 
== Determined if the quads are centered on the beam line ==
−
Turn off all the power supplies for the quads. Then turn one of the quad, see if the center of the beam is shifting. If it does, then that quad is not centered.  
+
The power supplies for ALL quads should be off.
−
Do the same for all other quads.
+
 
 +
===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 ===
 +
 
 +
[[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_on_Filament_on_RF_on.jpg | 400 px]]
 +
 
 +
=== HV off, Filament on, RF on ===
 +
 
 +
[[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_off_Filament_on_RF_on.jpg | 400 px]]
 +
 
 +
=== HV off, Filament on, RF off ===
 +
 
 +
[[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_off_Filament_on_RF_off.jpg | 400 px]]
 +
 
 +
=== HV on, Filament on, RF off ===
 +
 
 +
[[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_on_Filament_on_RF_off.jpg | 400 px]]
 +
 
 +
 
 +
 
 +
 
 +
 
 +
=== HV on, Filament on, RF on, Valve closed ===
 +
 
 +
[[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_on_Filament_on_RF_on_valve_closed.jpg | 400 px]]
 +
 
 +
=== HV off, Filament on, RF on, Valve closed ===
 +
 
 +
[[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_off_Filament_on_RF_on_valve_closed.jpg | 400 px]]
 +
 
 +
=== HV on, Filament on, RF off, Valve closed ===
 +
 
 +
[[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_on_Filament_on_RF_off_valve_closed.jpg | 400 px]]
 +
 
 +
=== HV off, Filament on, RF off, Valve closed ===
 +
 
 +
[[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_off_Filament_on_RF_off_valve_closed.jpg | 400 px]]
 +
 
 +
=== Conclusion ===
 +
When the HV is off, there were not any electrons from filament. We still see back ground light. This light was gone when the RF was turned off or vacuum valve (between screen and gun) was closed. So, this back ground light was due the the dark current that emitted from the cavity (field emission).
 +
 
 +
== 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
 +
 
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011Tuned_for_Max_transmision_to_FC_Just_by_steering_Magnets.jpg | 300 px]]
 +
 
 +
====Tuned for Max transmision to FC by using quads and steering Magnets====
 +
 
 +
==== Using 1st Triplets ====
 +
 
 +
Peak Current (mA): 160
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011Tuned_for_Max_transmision_to_FC_by_steering_Magnets_and_quads_1st_triplet.jpg | 300 px]]
 +
 
 +
 
 +
==== Using 2nd Triplets ====
 +
 
 +
Peak Current (mA): 160
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011Tuned_for_Max_transmision_to_FC_by_steering_Magnets_and_quads_2nd_triplet.jpg | 300 px]]
 +
 
 +
 
 +
=== Using Both Triplets ===
 +
 
 +
Peak Current (mA): 160
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011Tuned_for_Max_transmision_to_FC_by_steering_Magnets_and_quads_both_triplet.jpg | 300 px]]
 +
 
 +
===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:
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_quads_off.jpg | 300 px]]
 +
 
 +
==== 1st quad of the 1st triplet on  ====
 +
 
 +
1st quad of the 1st triplet power supply at (A): 2
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_1st_quad_of_1st_Triplet_power_supply_at_2Amp.jpg | 300 px]]
 +
 
 +
1st quad of the 1st triplet power supply at (A): 4
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_1st_quad_of_1st_Triplet_power_supply_at_4Amp.jpg | 300 px]]
 +
 
 +
1st quad of the 1st triplet power supply at (A): 6
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_1st_quad_of_1st_Triplet_power_supply_at_6Amp.jpg | 300 px]]
 +
 
 +
1st quad of the 1st triplet power supply at (A): 8
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_1st_quad_of_1st_Triplet_power_supply_at_8Amp.jpg | 300 px]]
 +
 
 +
1st quad of the 1st triplet power supply at (A): 10
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_1st_quad_of_1st_Triplet_power_supply_at_10Amp.jpg | 300 px]]
 +
 
 +
 
 +
 
 +
 
 +
 
 +
==== 2nd quad of the 1st triplet on  ====
 +
 
 +
2nd quad of the 1st triplet power supply at (A): 2
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_2nd_quad_of_1st_Triplet_power_supply_at_2Amp.jpg | 300 px]]
 +
 
 +
2nd quad of the 1st triplet power supply at (A): 4
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_2nd_quad_of_1st_Triplet_power_supply_at_4Amp.jpg | 300 px]]
 +
 
 +
2nd quad of the 1st triplet power supply at (A): 6
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_2nd_quad_of_1st_Triplet_power_supply_at_6Amp.jpg | 300 px]]
 +
 
 +
2nd quad of the 1st triplet power supply at (A): 8
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_2nd_quad_of_1st_Triplet_power_supply_at_8Amp.jpg | 300 px]]
 +
 
 +
2nd quad of the 1st triplet power supply at (A): 10
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_2nd_quad_of_1st_Triplet_power_supply_at_10Amp.jpg | 300 px]]
 +
 
 +
===Tune on center of Target===
 +
 
 +
 
 +
Rep Rate (Hz): 6
 +
Pulse width (ns): 200
 +
Peak Current (mA): 120
 +
 
 +
Tuned on center of the target:
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned on_center_of_Target_Beam_On.jpg | 300 px]]
 +
 
 +
 
 +
Rf on, HV off (for back ground subtraction):
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned on_center_of_Target_HV_Off_RF_On_for_bg_subtraction.jpg | 300 px]]
 +
 
 +
 
 +
No beam, light is on:
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned on_center_of_Target_No_Beam.jpg | 300 px]]
 +
 
 +
 
 +
=== Conclusion ===
 +
 
 +
The center of the target, the beam spot has maximum transmision to FC, and min quad deflection beam spot are at different positions. Thus, beam line is not aliened.
 +
 
 +
== OTR Check Polarization==
 +
 
 +
Analog camera focused at infinity, and place such that lens is touching the window.
 +
 
 +
Pulse width (FMHM): 200 ns
 +
 
 +
Peak Current: 160 mA
 +
 
 +
Camera focused at infinity.
 +
 
 +
=== No polarizer ===
 +
 
 +
Accelerator off, back ground
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_OTR_Check_Polarization_No_polarizer_Back_Ground.jpg | 300 px ]]
 +
 
 +
==== 50 Hz Rep Rate ====
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_OTR_Check_Polarization_No_polarizer_50Hz_1.jpg | 300 px ]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_OTR_Check_Polarization_No_polarizer_50Hz_2.jpg | 300 px ]]
 +
 
 +
==== 291 Hz Rep Rate ====
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_OTR_Check_Polarization_No_polarizer_291Hz_1.jpg | 300 px ]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_OTR_Check_Polarization_No_polarizer_291Hz_2.jpg | 300 px ]]
 +
 
 +
=== Polarization of the Polarizer Parallel to the Beam Line Direction  ===
 +
 
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_OTR_Check_Polarization_polarizer_Parellel_to_BeamLine_80Hz_1.jpg | 300 px ]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_OTR_Check_Polarization_polarizer_Parellel_to_BeamLine_80Hz_2.jpg | 300 px ]]
 +
 
 +
 
 +
=== Polarization of the Polarizer Perpendicular to the Beam Line Direction  ===
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_OTR_Check_Polarization_perpendicular_Parellel_to_BeamLine_80Hz_1.jpg | 300 px ]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_OTR_Check_Polarization_perpendicular_Parellel_to_BeamLine_80Hz_2.jpg | 300 px ]]
 +
 
 +
== 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.
 +
 
 +
Rep Rate (Hz): 6
 +
 
 +
Pulse width (ns): 200
 +
 
 +
=== 160 mA peak Current ===
 +
 
 +
Peak Current (mA): 160
 +
 
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_160mA_0ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_160mA_1ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_160mA_2ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_160mA_4ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_160mA_8ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_160mA_16ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_160mA_32ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_160mA_64ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_160mA_96ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_160mA_127ns.jpg | 300 px]]
 +
 
 +
 
 +
 
 +
 
 +
=== 105 mA peak Current ===
 +
 
 +
Peak Current (mA): 105
 +
 
 +
 
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_105mA_0ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_105mA_1ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_105mA_2ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_105mA_4ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_105mA_8ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_105mA_16ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_105mA_32ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_105mA_64ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delaye_105mAd_96ns.jpg | 300 px]]
 +
[[File:HRRL_OTR_Test_Mar_3rd_2011_Time_Slice_Study_Delayed_105mA_127ns.jpg | 300 px]]
 +
 
 +
== Far field==
 +
 
 +
Now return the camera trigger back to the original location in time.  Focus at infinity and try to observe polarization.
 +
 
 +
 
 +
= Report =
 +
 
 +
== Field Emission ==
 +
 
 +
{| border="1"  |cellpadding="20" cellspacing="0
 +
|-
 +
| [[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_on_Filament_on_RF_on.jpg | 300 px|thumb|HV on, RF on.]]
 +
| [[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_off_Filament_on_RF_on.jpg| 300 px|thumb|HV off, RF on.]]
 +
|-
 +
| [[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_off_Filament_on_RF_off.jpg | 300 px|thumb|HV off, RF off.]]
 +
| [[File:HRRL_Test_Mar_3rd_2001_FIled_Emission_Cehck_HV_on_Filament_on_RF_on_valve_closed.jpg | 300 px|thumb| HV on, RF on, Valve closed. ]]
 +
|}<br>
 +
 +
When the HV is off, there were not any electrons from filament. We still see back ground light. This light was gone when the RF was turned off or vacuum valve (between screen and gun) was closed. So, this back ground light was due the the dark current that emitted from the cavity (field emission).
 +
 
 +
== Beam Alignment ==
 +
 
 +
 
 +
{| border="1"  |cellpadding="20" cellspacing="0
 +
|-
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned on_center_of_Target_No_Beam.jpg | 300 px|thumb| No beam, light is on. ]]
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned on_center_of_Target_No_Beam_Calibration.jpg | 300 px|thumb| No beam, light is on for calibration. ]]
 +
|-
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned on_center_of_Target_Beam_On.jpg | 300 px|thumb| Tuned on center of the target. ]]
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned on_center_of_Target_Beam_On_Contour.jpg | 300 px|thumb| Tuned on center of the target (contour). ]]
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned on_center_of_Target_Beam_On_Histogram.jpg | 300 px|thumb| Tuned on center of the target projection (histograms). ]]
 +
|-
 +
 
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011Tuned_for_Max_transmision_to_FC_Just_by_steering_Magnets.jpg | 300 px|thumb| Tuned for maximum transmision to FC just by steering magnets. ]]
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011Tuned_for_Max_transmision_to_FC_Just_by_steering_Magnets_Contour.jpg | 300 px|thumb| Tuned for maximum transmision to FC just by steering magnets (contour). ]]
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011Tuned_for_Max_transmision_to_FC_Just_by_steering_Magnets_Histogram.jpg | 300 px|thumb| Tuned for maximum transmision to FC just by steering magnets projection (histograms). ]]
 +
|-
 +
 
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_quads_off.jpg | 300 px|thumb| Tuned for min quad deflection (quads off). ]]
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_quads_off_Contour.jpg | 300 px|thumb| Tuned for min quad deflection (quads off) (contour). ]]
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_quads_off_Histogram.jpg | 300 px|thumb| Tuned for min quad deflection (quads off) projection (histograms). ]]
 +
 
 +
|}<br>
 +
 
 +
The center of the target, the beam spot has maximum transmision to FC, and min quad deflection beam spot are at different positions. Thus, beam line is not aliened.
 +
 
 +
{| border="1"  |cellpadding="20" cellspacing="0
 +
|-
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned on_center_of_Target_Beam_On.jpg | 300 px|thumb| ]]
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011Tuned_for_Max_transmision_to_FC_Just_by_steering_Magnets.jpg | 300 px|thumb| ]]
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_quads_off.jpg | 300 px|thumb|  ]]
 +
|-
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned on_center_of_Target_Beam_On_Contour_Marked.jpg | 300 px|thumb| Tuned on center of the target (contour). Beam center at (340,350). ]]
 +
 
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011Tuned_for_Max_transmision_to_FC_Just_by_steering_Magnets_Contour_Marked.jpg | 300 px|thumb| Tuned for maximum transmision to FC just by steering magnets (contour). Beam center at (240,355). Off from center of the target by (100,5) pixels. Which is (5.52 mm,0.403 mm) ]]
 +
 
 +
| [[File:HRRL_OTR_Test_Mar_3rd_2011_Tuned for_Min_Quad_deflection_spot_quads_off_Contour_Marked.jpg | 300 px|thumb| Tuned for min quad deflection (quads off) (contour). Beam center at (450,365). Off from center of the target by (110,5) pixels. Which is (6.072 mm,1.209 mm). ]]
 +
|}<br>
 +
 
 +
Distance between FC to OTR is 56 cm. They are off by 0.552 cm. They angle beam was going through them should be arctan(0.552/56)= 0.564754393 degree.
 +
 
 +
The distance from the exit of the Cavity to the OTR target is 353 cm.
 +
 
 +
<math>\frac{l}{353}=\frac{0.552}{56}</math>
 +
 
 +
<math>l=\frac{0.552}{56} \times 353= 3.479~cm</math>
 +
 
 +
== OTR Light Verification ==
 +
 
 +
 
 +
{| border="1"  |cellpadding="20" cellspacing="0
 +
|-
 +
| [[File:HV_off_RF_on_200ns_160mA_Polarizer_Parellel_to_Beamline_80Hz_1_projection.png | 300 px|thumb| Polarizer parallel the beam direction. ]]
 +
| [[File:HV_off_RF_on_200ns_160mA_Polarizer_Parellel_to_Beamline_80Hz_2_projection.png | 300 px|thumb| Polarizer parallel the beam direction. ]]
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|-
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| [[File:HV_off_RF_on_200ns_160mA_Polarizer_Perpendicular_to_Beamline_80Hz_1_projection.png | 300 px|thumb| Polarizer perpendicular the beam direction. ]]
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| [[File:HV_off_RF_on_200ns_160mA_Polarizer_Perpendicular_to_Beamline_80Hz_2_projection.png | 300 px|thumb| Polarizer perpendicular the beam direction. ]]
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|}<br>
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A polarizer was placed perpendicular and parallel to the beam line direction to check it the light we were sing is polarized or not. Projections were do to look at the occurrence of incidents. From these results, it is convincing to say light is polarized. The noise is too high with analog camera that were used. Further investigation need to be done with better camera.
 +
 
 +
Back to [[Positrons]]

Latest revision as of 02:59, 10 March 2011

Preparation

JAI Camera Setup

Target in:

HRRL OTR Test Mar 3rd 2011 JAI Camera Setup 1.jpg HRRL OTR Test Mar 3rd 2011 JAI Camera Setup 2.jpg


Target out:

HRRL OTR Test Mar 3rd 2011 JAI Camera Setup Target Out 1.jpg


Target in after shielded:

HRRL OTR Test Mar 3rd 2011 JAI Camera Setup shielded target in 1.jpg

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

HRRL Test Mar 3rd 2001 FIled Emission Cehck HV on Filament on RF on.jpg

HV off, Filament on, RF on

HRRL Test Mar 3rd 2001 FIled Emission Cehck HV off Filament on RF on.jpg

HV off, Filament on, RF off

HRRL Test Mar 3rd 2001 FIled Emission Cehck HV off Filament on RF off.jpg

HV on, Filament on, RF off

HRRL Test Mar 3rd 2001 FIled Emission Cehck HV on Filament on RF off.jpg



HV on, Filament on, RF on, Valve closed

HRRL Test Mar 3rd 2001 FIled Emission Cehck HV on Filament on RF on valve closed.jpg

HV off, Filament on, RF on, Valve closed

HRRL Test Mar 3rd 2001 FIled Emission Cehck HV off Filament on RF on valve closed.jpg

HV on, Filament on, RF off, Valve closed

HRRL Test Mar 3rd 2001 FIled Emission Cehck HV on Filament on RF off valve closed.jpg

HV off, Filament on, RF off, Valve closed

HRRL Test Mar 3rd 2001 FIled Emission Cehck HV off Filament on RF off valve closed.jpg

Conclusion

When the HV is off, there were not any electrons from filament. We still see back ground light. This light was gone when the RF was turned off or vacuum valve (between screen and gun) was closed. So, this back ground light was due the the dark current that emitted from the cavity (field emission).

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


HRRL OTR Test Mar 3rd 2011Tuned for Max transmision to FC Just by steering Magnets.jpg

Tuned for Max transmision to FC by using quads and steering Magnets

Using 1st Triplets

Peak Current (mA): 160

HRRL OTR Test Mar 3rd 2011Tuned for Max transmision to FC by steering Magnets and quads 1st triplet.jpg


Using 2nd Triplets

Peak Current (mA): 160

HRRL OTR Test Mar 3rd 2011Tuned for Max transmision to FC by steering Magnets and quads 2nd triplet.jpg


Using Both Triplets

Peak Current (mA): 160

HRRL OTR Test Mar 3rd 2011Tuned for Max transmision to FC by steering Magnets and quads both triplet.jpg

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:

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot quads off.jpg

1st quad of the 1st triplet on

1st quad of the 1st triplet power supply at (A): 2

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot 1st quad of 1st Triplet power supply at 2Amp.jpg

1st quad of the 1st triplet power supply at (A): 4

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot 1st quad of 1st Triplet power supply at 4Amp.jpg

1st quad of the 1st triplet power supply at (A): 6

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot 1st quad of 1st Triplet power supply at 6Amp.jpg

1st quad of the 1st triplet power supply at (A): 8

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot 1st quad of 1st Triplet power supply at 8Amp.jpg

1st quad of the 1st triplet power supply at (A): 10

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot 1st quad of 1st Triplet power supply at 10Amp.jpg



2nd quad of the 1st triplet on

2nd quad of the 1st triplet power supply at (A): 2

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot 2nd quad of 1st Triplet power supply at 2Amp.jpg

2nd quad of the 1st triplet power supply at (A): 4

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot 2nd quad of 1st Triplet power supply at 4Amp.jpg

2nd quad of the 1st triplet power supply at (A): 6

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot 2nd quad of 1st Triplet power supply at 6Amp.jpg

2nd quad of the 1st triplet power supply at (A): 8

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot 2nd quad of 1st Triplet power supply at 8Amp.jpg

2nd quad of the 1st triplet power supply at (A): 10

HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot 2nd quad of 1st Triplet power supply at 10Amp.jpg

Tune on center of Target

Rep Rate (Hz): 6 Pulse width (ns): 200 Peak Current (mA): 120

Tuned on center of the target:

HRRL OTR Test Mar 3rd 2011 Tuned on center of Target Beam On.jpg


Rf on, HV off (for back ground subtraction):

HRRL OTR Test Mar 3rd 2011 Tuned on center of Target HV Off RF On for bg subtraction.jpg


No beam, light is on:

HRRL OTR Test Mar 3rd 2011 Tuned on center of Target No Beam.jpg


Conclusion

The center of the target, the beam spot has maximum transmision to FC, and min quad deflection beam spot are at different positions. Thus, beam line is not aliened.

OTR Check Polarization

Analog camera focused at infinity, and place such that lens is touching the window.

Pulse width (FMHM): 200 ns

Peak Current: 160 mA

Camera focused at infinity.

No polarizer

Accelerator off, back ground

HRRL OTR Test Mar 3rd 2011 OTR Check Polarization No polarizer Back Ground.jpg

50 Hz Rep Rate

HRRL OTR Test Mar 3rd 2011 OTR Check Polarization No polarizer 50Hz 1.jpg HRRL OTR Test Mar 3rd 2011 OTR Check Polarization No polarizer 50Hz 2.jpg

291 Hz Rep Rate

HRRL OTR Test Mar 3rd 2011 OTR Check Polarization No polarizer 291Hz 1.jpg HRRL OTR Test Mar 3rd 2011 OTR Check Polarization No polarizer 291Hz 2.jpg

Polarization of the Polarizer Parallel to the Beam Line Direction

HRRL OTR Test Mar 3rd 2011 OTR Check Polarization polarizer Parellel to BeamLine 80Hz 1.jpg HRRL OTR Test Mar 3rd 2011 OTR Check Polarization polarizer Parellel to BeamLine 80Hz 2.jpg


Polarization of the Polarizer Perpendicular to the Beam Line Direction

HRRL OTR Test Mar 3rd 2011 OTR Check Polarization perpendicular Parellel to BeamLine 80Hz 1.jpg HRRL OTR Test Mar 3rd 2011 OTR Check Polarization perpendicular Parellel to BeamLine 80Hz 2.jpg

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.

Rep Rate (Hz): 6

Pulse width (ns): 200

160 mA peak Current

Peak Current (mA): 160


HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 160mA 0ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 160mA 1ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 160mA 2ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 160mA 4ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 160mA 8ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 160mA 16ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 160mA 32ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 160mA 64ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 160mA 96ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 160mA 127ns.jpg



105 mA peak Current

Peak Current (mA): 105


HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 105mA 0ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 105mA 1ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 105mA 2ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 105mA 4ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 105mA 8ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 105mA 16ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 105mA 32ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 105mA 64ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delaye 105mAd 96ns.jpg HRRL OTR Test Mar 3rd 2011 Time Slice Study Delayed 105mA 127ns.jpg

Far field

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


Report

Field Emission

HV on, RF on.
HV off, RF on.
HV off, RF off.
HV on, RF on, Valve closed.


When the HV is off, there were not any electrons from filament. We still see back ground light. This light was gone when the RF was turned off or vacuum valve (between screen and gun) was closed. So, this back ground light was due the the dark current that emitted from the cavity (field emission).

Beam Alignment

No beam, light is on.
No beam, light is on for calibration.
Tuned on center of the target.
Tuned on center of the target (contour).
Tuned on center of the target projection (histograms).
Tuned for maximum transmision to FC just by steering magnets.
Tuned for maximum transmision to FC just by steering magnets (contour).
Tuned for maximum transmision to FC just by steering magnets projection (histograms).
Tuned for min quad deflection (quads off).
Tuned for min quad deflection (quads off) (contour).
Tuned for min quad deflection (quads off) projection (histograms).


The center of the target, the beam spot has maximum transmision to FC, and min quad deflection beam spot are at different positions. Thus, beam line is not aliened.

HRRL OTR Test Mar 3rd 2011 Tuned on center of Target Beam On.jpg
HRRL OTR Test Mar 3rd 2011Tuned for Max transmision to FC Just by steering Magnets.jpg
HRRL OTR Test Mar 3rd 2011 Tuned for Min Quad deflection spot quads off.jpg
Tuned on center of the target (contour). Beam center at (340,350).
Tuned for maximum transmision to FC just by steering magnets (contour). Beam center at (240,355). Off from center of the target by (100,5) pixels. Which is (5.52 mm,0.403 mm)
Tuned for min quad deflection (quads off) (contour). Beam center at (450,365). Off from center of the target by (110,5) pixels. Which is (6.072 mm,1.209 mm).


Distance between FC to OTR is 56 cm. They are off by 0.552 cm. They angle beam was going through them should be arctan(0.552/56)= 0.564754393 degree.

The distance from the exit of the Cavity to the OTR target is 353 cm.

[math]\frac{l}{353}=\frac{0.552}{56}[/math]

[math]l=\frac{0.552}{56} \times 353= 3.479~cm[/math]

OTR Light Verification

Polarizer parallel the beam direction.
Polarizer parallel the beam direction.
Polarizer perpendicular the beam direction.
Polarizer perpendicular the beam direction.


A polarizer was placed perpendicular and parallel to the beam line direction to check it the light we were sing is polarized or not. Projections were do to look at the occurrence of incidents. From these results, it is convincing to say light is polarized. The noise is too high with analog camera that were used. Further investigation need to be done with better camera.

Back to Positrons

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