The design of the Ali CMB Polarization Telescope receiver

Salatino, Maria; Austermann, J. E.; Thompson, K. L.; Ade, Peter A. R.; Bai, Xiran; Beall, James A.; Becker, D.; Cai, Yi-Fu; Chang, Zhi; Ding, Chen; Connors, J.; Chen, Pisin; Dober, Bradley; Delabrouille, J.; Duff, Shannon M.; Gao, G. H.; Givhan, Richard C.; Ghosh, Shamik; Hilton, G. C.; Hu, Bin; Hubmayr, Johannes; Karpel, E.; Kuo, Chao-Lin; Li, Hong; Li, Mingzhe; Li, Siyu; Li, Xufang; Link, Michael J.; Li, Yongping; Líu, Hao; Liu, Liyong; Liu, Yang; Lukas, Tammy; Lu, X. F.; Mates, J. A. B.; Mathewson, Justin; Mauskopf, Philip; Meinke, Jeremy; Montana-Lopez, Jordi; Shi, J. Y.; Sinclair, Adrian; Stephenson, Ryan; Sun, Weishin; Tseng, Yu‐Han; Tucker, C.; Ullom, Joel N.; Vale, Leila R.; Lanen, Jeff Van; Vissers, Michael; Walker, Samantha; Wang, Bo; Wang, Guofeng; Wang, Jiaxin; Weeks, Eric; Wu, Di; Wu, Yuefeng; Xia, Jun-Qing; Xu, He; Yao, Ji; Yao, Yongqiang; Yoon, K. W.; Yue, Bin; Zhai, Hua; Zhang, Aimei; Zhang, Laiyu; Zhang, Le; Zhang, Pengjie; Zhang, Tong; Zhang, Xinmin; Zhang, Yifei; Zhang, Yongjie; Zhao, Gong-Bo; Zhao, Wen

doi:10.1117/12.2560709

Cited by 20 publications

(12 citation statements)

References 42 publications

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“…1,2,7,11,16 Other projects are considering the use of SMuRF or new tone-tracking readout systems for both bolometric and calorimetric µmux applications. 3,17 In the SMuRF scheme, an active feedback loop drives the probe tone to the center of the resonance, or the linear portion of the resonator phase slope. In order to enable flux ramping at higher rates, the SMuRF electronics rely on an adaptive filter to fit for the phase coefficients of a known sinusoidal frequency modulation.…”

Section: Readout Of µMuxmentioning

confidence: 99%

Bandwidth and Aliasing in the Microwave SQUID Multiplexer

Yu,

Ahmed,

Connors

et al. 2022

Preprint

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The microwave SQUID multiplexer (µmux) has enabled higher bandwidth or higher channel counts across a wide range of experiments in particle physics, astronomy, and spectroscopy. The large multiplexing factor coupled with recent commercial availability of microwave components and warm electronics readout systems make it an attractive candidate for systems requiring large cryogenic detector counts. Since the multiplexer is considered for both bolometric and calorimetric applications across several orders of magnitude of signal frequencies, understanding the bandwidth of the device and its interaction with readout electronics is key to appropriately designing and engineering systems. Here we discuss several important factors contributing to the bandwidth properties of µmux systems, including the intrinsic device bandwidth, interactions with warm electronics readout systems, and aliasing. We present simulations and measurements of µmux devices coupled with SLAC Microresonator RF (SMuRF) tone-tracking electronics and discuss several implications for future experimental design.

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Section: Readout Of µMuxmentioning

confidence: 99%

Bandwidth and Aliasing in the Microwave SQUID Multiplexer

Yu,

Ahmed,

Connors

et al. 2022

Preprint

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“…The Ali CMB Polarization Telescope (AliCPT) is the first Chinese CMB experiment. It will measure the CMB polarization in the northern hemisphere at 90 GHz and 150 GHz, located at Ali, in Tibet, China [38,39]. The key scientific objectives of the AliCPT project include producing the best CMB polarization observations of the northern sky, and making a significant detection of PGW using the high precision polarization data [40].…”

Section: Introduction To Science Objectivesmentioning

confidence: 99%

Performance forecasts for the primordial gravitational wave detection pipelines for AliCPT-1

Ghosh,

Liu,

Zhang

et al. 2022

Preprint

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AliCPT is the first Chinese cosmic microwave background (CMB) experiment which will make the most precise measurements of the CMB polarization in the northern hemisphere. The key science goal for AliCPT is the detection of primordial gravitational waves (PGWs). It is well known that an epoch of cosmic inflation, in the very early universe, can produce PGWs, which leave an imprint on the CMB in form of odd parity B-mode polarization. In this work, we study the performance of the component separation and parameter estimation pipelines in context of constraining the value of the tensor-to-scalar ratio. Based on the simulated data for one observation season, we compare five different pipelines with different working principles. Three pipelines perform component separation at map or spectra level before estimating r from the cleaned spectra, while the other two pipelines performs a global fit for both foreground parameters and r. We also test different methods to account for the effects of time stream filtering systematics. This work shows that our pipelines provide consistent and robust constraints on the tensor-to-scalar ratio and a consistent sensitivity σprq " 0.02. This showcases the potential of precise B-mode polarization measurement with AliCPT-1. AliCPT will provide a powerful opportunity to detect PGWs, which is complementary with various ground-based CMB experiments in the southern hemisphere.

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“…Reduction of reflection loss is achieved by applying an anti-reflection coating (ARC) to the light entry and exit surfaces of the filter. A number of publications discuss ARC approaches for alumina [6][7][8][9][10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Large Diameter Millimeter-Wave Low-Pass Filter Made of Alumina with Laser Ablated Anti-Reflection Coating

Takaku,

Wen,

Cray

et al. 2021

Preprint

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We fabricated a 302 mm diameter low-pass filter made of alumina that has an anti-reflection coating (ARC) made with laser-ablated sub-wavelength structures (SWS). The filter has been integrated into and is operating with the MUSTANG2 instrument, which is coupled to the Green Bank Telescope. The average transmittance of the filter in the MUSTANG2 operating band between 75 and 105 GHz is 98%. Reflective loss due to the ARC is 1%. The difference in transmission between the s-and p-polarization states is less than 1%. To within 1% accuracy we observe no variance in these results when transmission is measured in six independent filter spatial locations. The alumina filter has replaced a prior MUSTANG2 Teflon filter. Data taken with the filter heat sunk to its nominal 40 K stage show performance consistent with expectations: a reduction of about 50% in filters-induced optical power load on the 300 mK stage, and in in-band optical loading on the detectors. This is the first report of an alumina filter with SWS ARC deployed with an operating instrument, and the first demonstration of a large area fabrication of SWS with laser ablation.

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The design of the Ali CMB Polarization Telescope receiver

Cited by 20 publications

References 42 publications

Bandwidth and Aliasing in the Microwave SQUID Multiplexer

Bandwidth and Aliasing in the Microwave SQUID Multiplexer

Performance forecasts for the primordial gravitational wave detection pipelines for AliCPT-1

A Large Diameter Millimeter-Wave Low-Pass Filter Made of Alumina with Laser Ablated Anti-Reflection Coating

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