The TolTEC Camera: Polarimetric Commissioning and Performance of the Continuously Rotating Half-wave Plate
Por:
Lee, Dennis, Novak, Giles A., Berthoud, Marc, Bussan, John, Golenia, Robert, Van Camp, Eric, Wilson, Grant W., DeNigris, N. S., Ma, Zhiyuan, McCrackan, Michael, Souccar, Kamal, Fissel, Laura M., Bij, Akanksha, Thiel, Felix, Aretxaga, Itziar, Ferrusca, Daniel, Mauskopf, Philip, Lunde, Emily L., Ade, Peter, Tucker, Carole, Pisano, Giampaolo, Cox, Erin Guilfoil, Sabin, Laurence, Carrasco-Gonzalez, Carlos, Pasetto, Alice, Gomez-Ruiz, Arturo, Hull, Chat, Austermann, Jason E., Beall, James A., Gao, Jiansong, Vissers, Michael
Publicada:
1 ene 2022
Resumen:
An ambient-temperature continuously rotating half-wave plate (CRHWP)
modulates the input polarization signal thereby enabling removal of
low-frequency (1/f) noise from polarized flux measurements. This 1/f
noise arises from atmospheric turbulence as well as from effects
intrinsic to certain detectors. Here, we describe the design and
performance of the half wave plate rotator and achromatic half-wave
plate for the the new imaging polarimeter, TolTEC. These components are
mounted in front of the cryostat window and operate at ambient
temperature. The half-wave plate rotator (HWPR) spins the half-wave
plate at 2 revolutions per second. The rotation mechanism consists of
nine air bearings to provide low-friction motion and a frameless torque
motor to directly drive rotation. The orientation of the rotor and
half-wave plate are recorded using a high-precision optical encoder. We
review the experimental requirements and technical design of the rotator
as well as the associated electronics, pneumatics, and software.
Filiaciones:
Lee, Dennis:
Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys CI, Evanston, IL 60208 USA
Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA
Novak, Giles A.:
Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys CI, Evanston, IL 60208 USA
Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA
Berthoud, Marc:
Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys CI, Evanston, IL 60208 USA
Bussan, John:
Northwestern Univ, Northwestern Univ Res Shop, Evanston, IL USA
Golenia, Robert:
Northwestern Univ, Northwestern Univ Res Shop, Evanston, IL USA
Van Camp, Eric:
Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys CI, Evanston, IL 60208 USA
Northwestern Univ, Dept Phys & Astron, Evanston, IL 60208 USA
Wilson, Grant W.:
Univ Massachusetts, Dept Astron, Amherst, MA USA
DeNigris, N. S.:
Univ Massachusetts, Dept Astron, Amherst, MA USA
Ma, Zhiyuan:
Univ Massachusetts, Dept Astron, Amherst, MA USA
McCrackan, Michael:
Univ Massachusetts, Dept Astron, Amherst, MA USA
Souccar, Kamal:
Univ Massachusetts, Dept Astron, Amherst, MA USA
Fissel, Laura M.:
Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON, Canada
Bij, Akanksha:
Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON, Canada
Thiel, Felix:
Queens Univ, Dept Phys Engn Phys & Astron, Kingston, ON, Canada
Aretxaga, Itziar:
Inst Nacl Astrofis Opt & Elect INAOE, Puebla, Mexico
Ferrusca, Daniel:
Inst Nacl Astrofis Opt & Elect INAOE, Puebla, Mexico
Mauskopf, Philip:
Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA
Lunde, Emily L.:
Arizona State Univ, Sch Earth & Space Explorat, Tempe, AZ USA
Ade, Peter:
Cardiff Univ, Cardiff CF10 3AX, S Glam, Wales
Tucker, Carole:
Cardiff Univ, Cardiff CF10 3AX, S Glam, Wales
Pisano, Giampaolo:
Univ Roma La Sapienza, Dept Phys, Rome, Italy
Cox, Erin Guilfoil:
Northwestern Univ, Ctr Interdisciplinary Explorat & Res Astrophys CI, Evanston, IL 60208 USA
Sabin, Laurence:
Univ Nacl Autonoma Mexico, Mexico City, DF, Mexico
Carrasco-Gonzalez, Carlos:
Univ Nacl Autonoma Mexico, Mexico City, DF, Mexico
Pasetto, Alice:
Univ Nacl Autonoma Mexico, Mexico City, DF, Mexico
Gomez-Ruiz, Arturo:
Inst Nacl Astrofis Opt & Elect INAOE, Puebla, Mexico
Hull, Chat:
Natl Astron Observ Japan, Mitaka, Tokyo, Japan
Austermann, Jason E.:
Natl Inst Stand & Technol NIST, Boulder, CO USA
Beall, James A.:
Natl Inst Stand & Technol NIST, Boulder, CO USA
Gao, Jiansong:
Natl Inst Stand & Technol NIST, Boulder, CO USA
Vissers, Michael:
Natl Inst Stand & Technol NIST, Boulder, CO USA
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