this draft presentation shows a comparison between the measured projection
DESCRIPTION
This draft presentation shows a comparison between the measured projection of the wire and the theoretical projection of the wire. The measured projection of the wire has been performed using the PS laser calibration system. - PowerPoint PPT PresentationTRANSCRIPT
This draft presentation shows a comparison between the measured projectionof the wire and the theoretical projection of the wire. The measured projectionof the wire has been performed using the PS laser calibration system.
The measurement has been performed for the scan speeds of 10 and 15 m/sfor the IN and OUT movements. The measurements has been repeated 3 times for each movement and speed.
This study is based in the following assumptions and parameters:- the distance from the fork axis to the beam axis (OBF) is 100,44 mm- the total angle of the fork travel (Th) is 136 degrees- the angle between the fort at IN position and the projection axis (Th0) is 0- the positive direction of the fork rotation is defined from the IN to the OUT- the distance between the laser and the beam (OL) is 0- the distance from the axis of the fork to the wire (FL) is 164 mm- the potentiometer value at IN position (potIN) is 41215 bits- the potentiometer value at OUT position potOUT) is 24345 bits- the total angle travelled by the motor is 180 degrees
see next slide for more details
Review of the New CERN Fast WirescannerJuan Herranz 18.04.20139th DITANET Topical Workshop on Non-Invasive Beam Size Measurements for High Brightness Proton and Heavy Ion Accelerators
PhotodiodeLaser DisplacerBeam
expender DisplacerScanner
+/- 50 mm Calibration table
Minimization strategies - Calibration
time
diod
e sig
nal
IN OUT
Thanks to Jonathan Emery
ThOFB
Beam axis (center of the tank)
tank wall
fork axis
projection axis
FL
Th0Laser axis
OL
IN
OUT
Scanner configuration
shows the calibration region location respect to the total projection of the fork travel
projection~ 288.3 mm
calibration region100 mm
motor position (bits)
wire
pro
jecti
on (m
m)
Scanner configuration
-50
0
50
-100
250
Scanner configuration
The following plots show the comparison between the wire projected positionrecorded with the laser calibrations system and the theoretical projection of thewire based in the kinematic chain of the scanner.
In principle the differences between both projections are due to the deformationson the mechanical parts of the system and on the carbon wire during the movement.
In order to have a more realistic comparison, most of the parameters used in this analysishave to be verified with the scanner used in the calibration system .For example the assumption that the angle between the fork of the scanner at IN position and the projection plane (Th0) is 0 is maybe not fully right.
The following plots are equivalent to the previous plots with the difference that the the value Th0 is set to 3 degrees.
calibration region
calibration region
PART 2
Bits
Volts
G1 @ 15 m/s
OUT
IN
OUTOffset between IN and OUT
0.25 V ~ 40 um
IN
OUT
After fixing electrical cable !
PART 3
??
beating phenomena