Difference between revisions of "E-Detector Motion System"

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== Introduction ==
 
== Introduction ==
  
−
* The electron detector is connected to the QWAD using the custom made Flex-cable. The detector is placed inside the vacuum-can whereas the QWAD is placed outside using appropriate flanges used between the Flex-cable and the QWAD. The connection between e-detector and the QWAD (if the vacuum - can was transparent) can be depicted as in the [[Media:EDet-QWAD layout in Vacuum-can.jpg | attached picture]].  
+
* The electron detector is connected to the QWAD using the custom made [[https://hallcweb.jlab.org/polwiki/index.php/Shielded_Flex_Cables Flex-cable]]. The detector is placed inside the vacuum-can whereas the QWAD boards are connected from outside the vacuum-can using appropriate flanges used between the Flex-cable and the QWAD. The connection between e-detector and the QWAD (if the vacuum - can was transparent) can be depicted as in the [[Media:EDet-QWAD layout in Vacuum-can.jpg | attached picture]].  
  
 
* The electron detector vacuum - can has a motion mechanism to allow us to move the detector vertically in and out of the beam along with the ability to rotate the detector facing the beam. A schematic view of the assembly can be seen [[Media:EDet_Motion_Mechanism.jpg | here]].
 
* The electron detector vacuum - can has a motion mechanism to allow us to move the detector vertically in and out of the beam along with the ability to rotate the detector facing the beam. A schematic view of the assembly can be seen [[Media:EDet_Motion_Mechanism.jpg | here]].
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#Inductance: 16 mH  
 
#Inductance: 16 mH  
 
#Direction: positive  
 
#Direction: positive  
−
#Distance Unit: inch
+
#Distance Unit: cm
−
#Velocity: inch/s
+
#Velocity: cm/s
−
#Acceleration Unit: in/s^2
+
#Acceleration Unit: cm/s^2
−
#Gear Ratio: (GR) = 25:1
+
#Gear Ratio: (GR) = 10:1
  
 
== Operation ==
 
== Operation ==
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We shall maintain two files for the controller settings
 
We shall maintain two files for the controller settings
−
* one, having the [[Media:EDet_motion_controller_current.txt‎‎ |most recent settings]]
+
* first, having the [[Media:EDet_motion_controller_current.txt‎‎ |most recent settings]]
 +
This defines 4 explicit positions
 +
1. Go Home;
 +
2. 7 mm above chicane beam;
 +
3. Garage, EOT-;
 +
4. 5 mm above chicane beam
 +
 
 
* second, having the [[Media:Edet_motion_controller_settings.txt‎ |last working settings]]
 
* second, having the [[Media:Edet_motion_controller_settings.txt‎ |last working settings]]

Revision as of 23:14, 1 October 2010

Introduction

  • The electron detector is connected to the QWAD using the custom made [Flex-cable]. The detector is placed inside the vacuum-can whereas the QWAD boards are connected from outside the vacuum-can using appropriate flanges used between the Flex-cable and the QWAD. The connection between e-detector and the QWAD (if the vacuum - can was transparent) can be depicted as in the attached picture.
  • The electron detector vacuum - can has a motion mechanism to allow us to move the detector vertically in and out of the beam along with the ability to rotate the detector facing the beam. A schematic view of the assembly can be seen here.
  • We are using a stepping motor identified as KML062S04 for vertical motion ( data sheet ) of detector using a MDC accuator ( specifications ). This motor is being controlled by a single axis IDC Controller (User Manual). The Motion Controller can be controlled through its keypad or via computer terminal after installing its software provided on their website
  • Motion Controller:
    • Vertically downward motion of the actuator is referred to as 'positive' direction based on the current settings of the controller.
    • All numbers displayed on the controller uses appropriate units of inch and second
    • The Actuator has 3 physically verifiable positions which correspond to a switch on the actuator.
      • EOT+ (end of travel switch in positive direction)
      • EOT- (end of travel switch in negative direction)
      • Home
    • Current Controller Settings:
  1. Current: 1.5A
  2. Resolution: 18000
  3. Inductance: 16 mH
  4. Direction: positive
  5. Distance Unit: cm
  6. Velocity: cm/s
  7. Acceleration Unit: cm/s^2
  8. Gear Ratio: (GR) = 10:1

Operation

At EOT- (physically top most) the actuator position read back (as seen on the controller display) is 

 -3.7833
 00000000      00000000

AC.02 VE.1 DA2 GO 

 +2.0000
 00000000      00000000

AC.02 VE.1 DA1 GO 

 +1.0000
 00000000      00000000

AC.02 VE.1 DA-2 GO 

 -2.0000
 00000000      00000000

AC.02 VE.1 DI1 GO 

 -1.0000
 00000000      00000000


Controller Settings

We shall maintain two files for the controller settings

This defines 4 explicit positions 

1. Go Home; 
2. 7 mm above chicane beam; 
3. Garage, EOT-; 
4. 5 mm above chicane beam
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