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Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides Target Field Direction Measurement Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky 07.24.2019 Murchhana Roy, Suman

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Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Target Field Direction Measurement

Murchhana Roy, Suman Kandu, Wolfgang Korsch

University of Kentucky

07.24.2019

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 2

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Overview

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 3

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 4

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Background

Horizontal compass measures the angle made by the horizontal magnetic field with respect to electron beam direction in Hall C. It was built in University of Kentucky and used in at least two experiments :

“Measurement of the Neutron Electric Form Factor at High Q2”(E02-013). “Measurement of Single Target-Spin Asymmetry in Semi-Inclusive Reaction on a Transversely Polarized 3He Target”(E06-010).

All of its missing parts have been rebuilt and a compass fixture has been built in the machine shop at University of Kentucky for its use in experiments (E12-06-110 and E12-06-121).

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 5

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 6

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Design Details

Air floated device. Cylindrical magnet with mirror and circular scale attached. Three screws and a spring is used to align the mirror. Three adjustable legs.

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 7

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Design Details

Compass fixture with 11 equidistant holes. Target field direction will be scanned in 11 positions along the target length.

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 8

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

How Does it Work?

The magnetic axis of the cylindrical magnet points to the direction of the target field while floating. The magnetic field direction is measured by determining the direction of the surface normal of the mirror. The surface normal of the mirror is given by the angular bisector of the incident and reflected laser beams.

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 9

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

How Does it Work?

The geometric and magnetic axes of the cylindrical magnet do not coincide. The compass mirror is aligned parallel to the magnetic axis of the compass magnet to minimize the horizontal error.

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 10

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 11

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Test Setup

Two convex lenses were used to collimate the laser beam. The reflected beam spot was monitored on a screen 2 meter away from the compass. A permanent magnet was used to generate 15 Gauss magnetic field.

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 12

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Result

The ellipse is a result of 360◦ scan of the cylindrical magnet. The semi minor axis of the fitted ellipse determines the horizontal error in the field direction measurement. Total Horizontal Error : ±0.1◦ Where, Statistical error:±0.09◦±0.05◦ Systematic error:±0.03◦

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 13

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 14

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Compass Fixture

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 15

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Compass Measurement (Installation Plan 1)

Requires one movable mirror, one fixed mirror and a movable transparent screen (approx. 15 cm × 15 cm). Requires survey of three points for each position of the horizontal compass.

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 16

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Compass Measurement (Installation Plan 2)

Requires a big transparent screen (approx. 100 cm × 100 cm), both the mirrors are fixed in place. Requires survey of three points for each position of the horizontal compass.

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 17

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 18

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Summary

The testing of the compass has been completed and it is ready for the upcoming experiment. An optics table will be required in Hall C to set up the laser and the mirrors for the horizontal compass measurements. The alignment group will be required during each compass measurement. Thank you!

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 19

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Backup Slides

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 20

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Compass Measurement (Installation Plan 1)

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 21

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Compass Measurement (Installation Plan 2)

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 22

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Vertical Compass

Measures the angle made by the vertical magnetic field with respect to the horizontal plane in Hall C.

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

SLIDE 23

Background Description of Horizontal Compass Compass Testing Application in Hall C Summary Backup Slides

Vertical Compass

Angle made by vertical magnetic field with respect to horizontal plane : θ = 90◦ − (N1 − N2) × 0.09 2 N1: encoder reading after turning on vertical magnetic field N2 : encoder reading after 180◦ rotation of floating disk. Calibration of the device will be done in a horizontal magnetic field.

Murchhana Roy, Suman Kandu, Wolfgang Korsch University of Kentucky Target Field Direction Measurement

Target Field Direction Measurement

Murchhana Roy, Suman Kandu, Wolfgang Korsch

University of Kentucky

07.24.2019

Overview

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Table of Contents

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Background

Horizontal compass measures the angle made by the horizontal magnetic field with respect to electron beam direction in Hall C. It was built in University of Kentucky and used in at least two experiments :

“Measurement of the Neutron Electric Form Factor at High Q2”(E02-013). “Measurement of Single Target-Spin Asymmetry in Semi-Inclusive Reaction on a Transversely Polarized 3He Target”(E06-010).

All of its missing parts have been rebuilt and a compass fixture has been built in the machine shop at University of Kentucky for its use in experiments (E12-06-110 and E12-06-121).

Table of Contents

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Design Details

Air floated device. Cylindrical magnet with mirror and circular scale attached. Three screws and a spring is used to align the mirror. Three adjustable legs.

Design Details

Compass fixture with 11 equidistant holes. Target field direction will be scanned in 11 positions along the target length.

How Does it Work?

How Does it Work?

The geometric and magnetic axes of the cylindrical magnet do not coincide. The compass mirror is aligned parallel to the magnetic axis of the compass magnet to minimize the horizontal error.

Table of Contents

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Test Setup

Two convex lenses were used to collimate the laser beam. The reflected beam spot was monitored on a screen 2 meter away from the compass. A permanent magnet was used to generate 15 Gauss magnetic field.

Result

The ellipse is a result of 360◦ scan of the cylindrical magnet. The semi minor axis of the fitted ellipse determines the horizontal error in the field direction measurement. Total Horizontal Error : ±0.1◦ Where, Statistical error:±0.09◦±0.05◦ Systematic error:±0.03◦

Table of Contents

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Compass Fixture

Compass Measurement (Installation Plan 1)

Requires one movable mirror, one fixed mirror and a movable transparent screen (approx. 15 cm × 15 cm). Requires survey of three points for each position of the horizontal compass.

Compass Measurement (Installation Plan 2)

Requires a big transparent screen (approx. 100 cm × 100 cm), both the mirrors are fixed in place. Requires survey of three points for each position of the horizontal compass.

Table of Contents

1 Background 2 Description of Horizontal Compass 3 Compass Testing 4 Application in Hall C 5 Summary

Summary

The testing of the compass has been completed and it is ready for the upcoming experiment. An optics table will be required in Hall C to set up the laser and the mirrors for the horizontal compass measurements. The alignment group will be required during each compass measurement. Thank you!

Backup Slides

Compass Measurement (Installation Plan 1)

Compass Measurement (Installation Plan 2)

Vertical Compass

Measures the angle made by the vertical magnetic field with respect to the horizontal plane in Hall C.

Vertical Compass