Presentation Title

Angular Calibration of the BICEP Array receivers using Far Field Beam Map Characterization

Faculty Mentor

Jamie Bock, Alessandro Schillaci

Start Date

23-11-2019 9:00 AM

End Date

23-11-2019 9:15 AM

Location

Markstein 303

Session

oral 1

Type of Presentation

Oral Talk

Subject Area

physical_mathematical_sciences

Abstract

The BICEP Array is the latest generation of instruments of the BICEP Keck Collaboration for Cosmic Microwave Background polarimetric measurements. It comprises four 550 mm telescopes observing between 30 to 270 GHz, aiming to generate sensitive CMB polarization maps for the detection of B-mode polarization signal, which would be the first direct evidence of inflationary gravitational waves. Amplitudes and angular distributions of differential responses against Gaussian fits for far-field response are required for explicitly predict B-mode power after deprojection.

My project focused on designing, constructing, and implementing a movable configuration allowing for full optical far-field characterization of the receivers, using a chopped thermal hot source. A structure for orienting a flat aluminum honeycomb mirror panel, delineated using ray tracing applications of Zemax, was designed and tested for stability using SolidWorks and assembled after machining. The motion was made controllable and programmable by implementing code in C. A Python interface was created to generate beam maps by allowing step motions and data acquisition. Zemax was also used to analytically compare diffraction energies at the receiver in the far-field or quasi-far-field.

Conducting far-field beam mapping for the current and future 30/40GHz receivers resulted in generating fractional differential plots against two-dimensional Gaussian fits to characterize the optical performance of the BICEP Array.

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Nov 23rd, 9:00 AM Nov 23rd, 9:15 AM

Angular Calibration of the BICEP Array receivers using Far Field Beam Map Characterization

Markstein 303

The BICEP Array is the latest generation of instruments of the BICEP Keck Collaboration for Cosmic Microwave Background polarimetric measurements. It comprises four 550 mm telescopes observing between 30 to 270 GHz, aiming to generate sensitive CMB polarization maps for the detection of B-mode polarization signal, which would be the first direct evidence of inflationary gravitational waves. Amplitudes and angular distributions of differential responses against Gaussian fits for far-field response are required for explicitly predict B-mode power after deprojection.

My project focused on designing, constructing, and implementing a movable configuration allowing for full optical far-field characterization of the receivers, using a chopped thermal hot source. A structure for orienting a flat aluminum honeycomb mirror panel, delineated using ray tracing applications of Zemax, was designed and tested for stability using SolidWorks and assembled after machining. The motion was made controllable and programmable by implementing code in C. A Python interface was created to generate beam maps by allowing step motions and data acquisition. Zemax was also used to analytically compare diffraction energies at the receiver in the far-field or quasi-far-field.

Conducting far-field beam mapping for the current and future 30/40GHz receivers resulted in generating fractional differential plots against two-dimensional Gaussian fits to characterize the optical performance of the BICEP Array.