Design and construction of a high-energy photon polarimeter - INSPIRE

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Design and construction of a high-energy photon polarimeter

Mar 22, 2017

13 pages

Published in:

Nucl.Instrum.Meth.A 867 (2017) 115-127

Published: Sep 21, 2017

e-Print:

1703.07875 [physics.ins-det]

DOI:

10.1016/j.nima.2017.05.026

View in:

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Abstract: (Elsevier)

We report on the design and construction of a high-energy photon polarimeter for measuring the degree of polarization of a linearly-polarized photon beam. The photon polarimeter uses the process of pair production on an atomic electron (triplet production). The azimuthal distribution of scattered atomic electrons following triplet production yields information regarding the degree of linear polarization of the incident photon beam. The polarimeter, operated in conjunction with a pair spectrometer, uses a silicon strip detector to measure the recoil electron distribution resulting from triplet photoproduction in a beryllium target foil. The analyzing power ΣA for the device using a 75 μm beryllium converter foil is about 0.2, with a relative systematic uncertainty in ΣA of 1.5%.

Note:

13 pages, 17 figures

Polarized photon beam
Beam characteristics
Polarization measurement
Triplet photoproduction

References(13)

Figures(18)

[1]

Pair production by photons on electrons

K. Mork

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•
DOI:
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[2]

Pair production in the field of atomic electrons

L. Maximon
,
H. Gima

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•
DOI:
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[3]

Detection of recoil electrons in triplet photoproduction

J. Hubbell
,
W. Veigele
,
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,
R. Brown
,
D. Cromer

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•
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[4]

Experimental triplet and pair photoproduction cross sections were obtained using the web application XCOM available at

- http://physics.nist.gov/PhysRefData/Xcom/html/xcom1.html

[5]

First Results from The GlueX Experiment

GlueX

Collaboration

•

H. Al Ghoul
(
- Florida State U.
)

et al.

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•
e-Print:
- 1512.03699
•
DOI:
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[6]

Hybrid Mesons

C.A. Meyer
(
- Carnegie Mellon U.
)
,
E.S. Swanson
(
- Pittsburgh U.
)

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•
e-Print:
- 1502.07276
•
DOI:
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[7]

Pair spectrometer hodoscope for Hall D at Jefferson Lab

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DOI:
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[8]

The stepper motor was purchased from Phytron GmbH

- http://www.phytron-elektronik.de

[9]

A data sheet for the Micron Semiconductor S3 device is available at

- http://www.micronsemiconductor.co.uk/pdf/s.pdf

[10]

box vacuum chambers available for purchase are described at

Kurt J. Lesker

- http://www.lesker.com/newweb/chambers/std_boxchamber.cfm

[11]

Information regarding the Swan Research preamplifiers is available at

- http://www.swanresearch.xorgate.com

[12]

The LTspice SPICE simulator software is available at

- http://www.linear.com/solutions/ltspice

[13]

Measurement of the beam asymmetry $\Sigma$ for $\pi^0$ and $\eta$ photoproduction on the proton at $E_\gamma = 9$ GeV

GlueX

Collaboration

•

H. Al Ghoul
(
- Florida State U.
)

et al.

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•
e-Print:
- 1701.08123
•
DOI:
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