Imperial College London

Professor Andrew H Jaffe

Faculty of Natural SciencesDepartment of Physics

Professor of Astrophysics and Cosmology



+44 (0)20 7594 7526a.jaffe Website




Miss Louise Hayward +44 (0)20 7594 7679




1018BBlackett LaboratorySouth Kensington Campus






BibTex format

author = {Collaboration, TEBEX and Aboobaker, AM and Ade, P and Araujo, D and Aubin, F and Baccigalupi, C and Bao, C and Chapman, D and Didier, J and Dobbs, M and Geach, C and Grainger, W and Hanany, S and Helson, K and Hillbrand, S and Hubmayr, J and Jaffe, A and Johnson, B and Jones, T and Klein, J and Korotkov, A and Lee, A and Levinson, L and Limon, M and MacDermid, K and Matsumura, T and Miller, AD and Milligan, M and Raach, K and Reichborn-Kjennerud, B and Sagiv, I and Savini, G and Spencer, L and Tucker, C and Tucker, GS and Westbrook, B and Young, K and Zilic, K},
title = {The EBEX Balloon Borne Experiment - Optics, Receiver, and Polarimetry},
url = {},

RIS format (EndNote, RefMan)

AB - The E and B Experiment (EBEX) was a long-duration balloon-borne cosmicmicrowave background polarimeter that flew over Antarctica in 2013. We describethe experiment's optical system, receiver, and polarimetric approach, andreport on their in-flight performance. EBEX had three frequency bands centeredon 150, 250, and 410 GHz. To make efficient use of limited mass and space wedesigned a 115 cm$^{2}$sr high throughput optical system that had two ambienttemperature mirrors and four anti-reflection coated polyethylene lenses perfocal plane. All frequency bands shared the same optical train. Polarimetry wasachieved with a continuously rotating achromatic half-wave plate (AHWP) thatwas levitated with a superconducting magnetic bearing (SMB). Rotation stabilitywas 0.45 % over a period of 10 hours, and angular position accuracy was 0.01degrees. This is the first use of a SMB in astrophysics. The measuredmodulation efficiency was above 90 % for all bands. To our knowledge the 109 %fractional bandwidth of the AHWP was the broadest implemented to date. Thereceiver that contained one lens and the AHWP at a temperature of 4 K, thepolarizing grid and other lenses at 1 K, and the two focal planes at 0.25 Kperformed according to specifications giving focal plane temperature stabilitywith fluctuation power spectrum that had $1/f$ knee at 2 mHz. EBEX was thefirst balloon-borne instrument to implement technologies characteristic ofmodern CMB polarimeters including high throughput optical systems, and largearrays of transition edge sensor bolometric detectors with mutiplexed readouts.
AU - Collaboration,TEBEX
AU - Aboobaker,AM
AU - Ade,P
AU - Araujo,D
AU - Aubin,F
AU - Baccigalupi,C
AU - Bao,C
AU - Chapman,D
AU - Didier,J
AU - Dobbs,M
AU - Geach,C
AU - Grainger,W
AU - Hanany,S
AU - Helson,K
AU - Hillbrand,S
AU - Hubmayr,J
AU - Jaffe,A
AU - Johnson,B
AU - Jones,T
AU - Klein,J
AU - Korotkov,A
AU - Lee,A
AU - Levinson,L
AU - Limon,M
AU - MacDermid,K
AU - Matsumura,T
AU - Miller,AD
AU - Milligan,M
AU - Raach,K
AU - Reichborn-Kjennerud,B
AU - Sagiv,I
AU - Savini,G
AU - Spencer,L
AU - Tucker,C
AU - Tucker,GS
AU - Westbrook,B
AU - Young,K
AU - Zilic,K
TI - The EBEX Balloon Borne Experiment - Optics, Receiver, and Polarimetry
UR -
ER -