Podcasts about Phonon

#241More than 2 million Palestinians in Gaza face widespread hunger, disease and injury as the war quickly becomes the worst humanitarian crisis in modern memory. Even once the war ends, the devastating physical and emotional health consequences will be felt for many years to come, especially by children. And aid groups like UNICEF and the World Health Organization have no long-term plans to meet the post-war health needs of the population.Gravity on Mars may occasionally be strong enough to stir up the oceans on Earth, even from 225 million kilometres away. A team led by researchers at the University of Sydney says Mars could be responsible for creating tiny wobbles in Earth's orbit – just enough to slightly warm the oceans.What if every piece of music ever recorded was replaced by AI-generated Taylor Swift covers? Researchers dreamed up this implausible-sounding thought-experiment to demonstrate the vulnerability of data to AI corruption – but is this actually a risk?Phonon lasers, which use ultra-concentrated sound vibrations instead of light, may one day help us with things like medical imaging and deep-sea monitoring. A team has now created the most powerful phonon laser ever made. It's brighter and narrower than its competition and can stay on far longer. But challenges remain in moving this technology out of the lab. Plus: Why Jupiter's moon Europa may be less likely to host life than scientists hoped; how North America's threatened sequoia trees are thriving thousands of miles from home; and why pythons may be the most sustainable meat for us to eat.Hosts Christie Taylor and Sophie Bushwick discuss with guests Grace Wade, Jacob Aron, Matthew Sparkes and Karmela Padavic-Callaghan. To read more about these stories, visit newscientist.com. Hosted on Acast. See acast.com/privacy for more information.

Oolacile goes Back To Back! Willy talks with him about his new album "Be Curious", running Halcyon Records, balancing sound design & emotion, advice for submitting to labels, the state of dubstep, Vegas vegans, the Phonon phenomenon, Vengeance samples, gaming, fanboying & lots more.   Join our Discord: http://discord.io/backtobackpod Willy Joy: http://linktr.ee/willyjoy Oolacile: https://go.halcyon.fm/connect https://www.instagram.com/oolacile/   PROTECT REPRODUCTIVE RIGHTS: https://abortionfunds.org/funds/ https://www.prochoiceamerica.org/ https://www.sistersong.net/  

mʊdʌki is chasing the aesthetics of the 90s raves which she will never experience, creating a model situation of an inaccessible club culture mirage. In her dj identity mʊdʌki flows in between bass music of such subgenres as jungle, dubstep, dub, juke, and avant garde experimental electronic music together with sound art, through a wide branch of techno – deep, minimal, breakbeat, industrial and hard acid techno tunes, all with a strong accent on the leftfield music scene. She is one of the founding members of phonon~ crew, mediating experimental electronic music and sound art in czech republic. Links: https://soundcloud.com/mudaki/sets/naviny-z-fluxu-radioplato https://soundcloud.com/mudaki/sets/mixtapes https://mudaki.bandcamp.com/ https://www.instagram.com/mudaki_sound/ https://soundcloud.com/phononcrew Tracks: LICHEN - ABDICATE [Outhouse Sounds] Al Wootton - Franz Qant - Salt Factory Anthem (forth. Virtual Forest) Majoriti - Decomposing [Reloaded Sounds] DTR - Vision [Foundation Audio / CRUD Recordings] Mesck - Sleepless Cadik - Camel Travel [Bass Theory Club] Duba - Beetroots [ODC Live] Pier - Desert Force [DeepEnd!] DJ Praktyczna Pani - Whoaaa [Polish Juke] J Beatz - Matchstick [Mode Digital] An Avrin - Fatigue [Slippery Sounds] Missy vs Murder - H.A.M & Chris Lunney's Bahn Mi Boys Bootleg [Hanger Management] Dubzta - White Dee [Project Allout Records] Dubrunner - BRUK OUT [199] Imaginary Number - Fools [YUKU] Terranigma - Deep Sea Oddities [Kamizdat] Fork and Knife, Shogun - Bitter [//DarkMode] Noizy Wilson - Grizzlies [Nü Kvlture] King Monday - Keys [Nü Kvlture] Slacker - Longmarsh [Room II Records Ltd] CAPIUZ - HELP ME [UNIZONE] Esthetic x Reac-Zo - Magen [Diffrent Music] Granul - Oneshot [YUKU] Khanum - Sands of Time [Transient Audio] WTCHCRFT - Burnt [#weirdkids] Mincy - Myspace Profile Classic [Extra Spicy] You like our podcast and want to get to know Infinite Sequence? Find us at: infinite-sequence.de soundcloud.com/infinitesequence/ https://podcasts.apple.com/de/podcast/infinite-sequence-podcast/id1176967264 facebook.com/infinitesequencedd instagram.com/infinite_sequence

On the EthHub Weekly Recap we cover topics from the EthHub Weekly Newsletter. In this episode we discuss ETH all-time high, Facebook rebrands to Meta, Optimism details EVM equivalence, Across Protocol, Phonon introduced, Adobe adds NFT support and Immutable + ESL partnership

1st Week of November, 2021 ------

Phonon shook the dubstep industry with his Beatport #1 song, Polyriddim – a tune that received World-wide press coverage and trended globally for its genre-breaking approaches. Hailed as the “Dream Theatre of Dubstep” by Oolacile and compared to Frank Zappa and Pink Floyd by musicians and non-musicians alike, Phonon’s music is played and supported by industry legends such as Modestep, Flux Pavilion, Subtronics, and Svdden Death. His music has been streamed/viewed millions of times across all platforms and reached audiences beyond EDM with famous musicians and YouTubers like 100 gecs, Jacob Collier, Adam Neely and Ludwig enjoying, discussing, playlisting, or commissioning his music. Phonon Links: https://open.spotify.com/artist/4CySw3P8BeBPMBr9Rymc8Y?si=dWcPmhOgRCGG1vEYZdIhrA https://soundcloud.com/phonon_music https://www.youtube.com/c/phononmusic https://instagram.com/phonon_music https://www.facebook.com/phonondubs https://www.twitch.tv/phonon2 Mr. Bill’s Links: Patreon: https://www.patreon.com/mrbillstunes https://live.mrbillstunes.com/ https://discord.gg/ySjhgWQ https://mrbill.bandcamp.com/ https://www.youtube.com/user/MrBillsTunes Podcast Production Inquiries: fumodenver@gmail.com  

Links Medium Article Overview Phonon Network Specification

Mixed by DJ Phonon

Alex Miller and Karl Kreder of Grid+ join Into the Ether to talk about exciting things their team has been working on. Their core energy business is growing in Texas but they’ve also been working on some really exciting things on the hardware front. The Lattice1, open for pre-orders now, is a new take on hardware wallets that is trying to revolutionize both UX and security. On top of that, they announce on the show a brand new Layer 2 scaling solution called Phonon Network. Support our show! Buy EthHub Merch Get on the email list at ethhub.substack.com

Project Trident 18.12 released, Spotifyd on NetBSD, OPNsense 18.7.10 is available, Ultra EPYC AMD Powered Sun Ultra 24 Workstation, OpenRsync, LLD porting to NetBSD, and more. ##Headlines ###AsiaBSDCon 2019 Call for Papers You have until Jan 30th to submit Full paper requirement is relaxed a bit this year (this year ONLY!) due to the short submission window. You don’t need all 10-12 pages, but it is still preferred. Send a message to secretary@asiabsdcon.org with your proposal. Could be either for a talk or a tutorial. Two days of tutorials/devsummit and two days of conference during Sakura season in Tokyo, Japan The conference is also looking for sponsors If accepted, flight and hotel is paid for by the conference ###Project Trident 18.12 Released Twitter account if you want to keep up on project news Screenshots Project Trident Community Telegram Channel DistroWatch Page LinuxActionNews Review RoboNuggie’s in depth review ###Building Spotifyd on NetBSD These are the steps I went through to build and run Spotifyd (this commit at the time of writing) on NetBSD AMD64. It’s a Spotify Connect client so it means I still need to control Spotify from another device (typically my phone), but the audio is played through my desktop… which is where my speakers and headphones are plugged in - it means I don’t have to unplug stuff and re-plug into my phone, work laptop, etc. This is 100% a “good enough for now solution” for me; I have had a quick play with the Go based microcontroller from spotcontrol and that allows a completely NetBSD only experience (although it is just an example application so doesn’t provide many features - great as a basis to build on though). ##News Roundup ###OPNsense 18.7.10 released 2019 means 19.1 is almost here. In the meantime accept this small incremental update with goodies such as Suricata 4.1, custom passwords for P12 certificate export as well as fresh fixes in the FreeBSD base. A lot of cleanups went into this update to make sure there will be a smooth transition to 19.1-RC for you early birds. We expect RC1 in 1-2 weeks and the final 19.1 on January 29. ###Introducing the Ultra EPYC AMD Powered Sun Ultra 24 Workstation A few weeks ago, I got an itch to build a workstation with AMD EPYC. There are a few constraints. First, I needed a higher-clock part. Second, I knew the whole build would be focused more on being an ultra high-end workstation rather than simply utilizing gaming components. With that, I decided it was time to hit on a bit of nostalgia for our readers. Mainly, I wanted to do an homage to Sun Microsystems. Sun made the server gear that the industry ran on for years, and as a fun fact, if you go behind the 1 Hacker Way sign at Facebook’s campus, they left the Sun Microsystems logo. Seeing that made me wonder if we could do an ultimate AMD EPYC build in a Sun Microsystems workstation. ###OpenRsync This is a clean-room implementation of rsync with a BSD (ISC) license. It is designed to be compatible with a modern rsync (3.1.3 is used for testing). It currently compiles and runs only on OpenBSD. This project is still very new and very fast-moving. It’s not ready for wide-spread testing. Or even narrow-spread beyond getting all of the bits to work. It’s not ready for strong attention. Or really any attention but by careful programming. Many have asked about portability. We’re just not there yet, folks. But don’t worry, the system is easily portable. The hard part for porters is matching OpenBSD’s pledge and unveil. ###The first report on LLD porting LLD is the link editor (linker) component of Clang toolchain. Its main advantage over GNU ld is much lower memory footprint, and linking speed. It is of specific interest to me since currently 8 GiB of memory are insufficient to link LLVM statically (which is the upstream default). The first goal of LLD porting is to ensure that LLD can produce working NetBSD executables, and be used to build LLVM itself. Then, it is desirable to look into trying to build additional NetBSD components, and eventually into replacing /usr/bin/ld entirely with lld. In this report, I would like to shortly summarize the issues I have found so far trying to use LLD on NetBSD. ###Ring in the new It’s the second week of 2019 already, which means I’m curious what Nate is going to do with his series This week in usability … reset the numbering from week 1? That series is a great read, to keep up with all the little things that change in KDE source each week — aside from the release notes. For the big ticket items of KDE on FreeBSD, you should read this blog instead. In ports this week (mostly KDE, some unrelated): KDE Plasma has been updated to the latest release, 5.14.5. KDE Applications 18.12.1 were released today, so we’re right on top of them. Marble was fixed for FreeBSD-running-on-Power9. Musescore caught up on 18 months of releases. Phonon updated to 4.10.1, along with its backends. And in development, Qt WebEngine 5.12 has been prepared in the incongruously-named plasma-5.13 branch in Area51; that does contain all the latest bits described above, as well. ##Beastie Bits NomadBSD 1.2-RC1 Released ZFS - The First Enterprise Blockchain Powersaving with DragonFly laptop NetBSD reaches 100% reproducable builds Potential Bhyve Web Interface? LibGDX proof of concept on OpenBSD - Video LiteCLI is a user-friendly CommandLine client for SQLite database In honor of Donald Knuth’s 81 birthday Stanford uploaded 111 lectures on Youtube Portland BSD Pizza Night - 2018-01-31 19:00 - Sweet Heart Pizza Stockholm BSD February meetup Polish BSD User Group: Jan 25 18:15 - 21:00 AsiaBSDcon 2019 CfP ##Feedback/Questions Greg - VLANs and jails Tara - ZFS on removable disks Casey - Interview with Kirk McKusick Send questions, comments, show ideas/topics, or stories you want mentioned on the show to feedback@bsdnow.tv

你好，这里是《科技最前沿》，喜爱科学的你来啦，我是你的老朋友丘孔语论。这一期我给大家分享《声子计算机：计算机技术未来发展的新希望！》，这篇文章来自于环球创新智慧的原创。科技最前沿，丘孔语论带你遨游科技的海洋，天文、物理、互联网、人工智能、数码、编程、大数据、创新创业、化学医学、养生、心理学、灵性等等等统统都可能涉及到；海内外，宇宙中，跟着我，就够了……开始聆听科技的声音吧：---------------------导读从传统的电子计算机，到新兴的光子计算机和量子计算机，计算机技术不断创新发展，然而声子计算机又是什么？它会成为计算技术未来发展的新希望吗？让我们透过美国亚利桑那大学最新的声子计算机研究一起来看看。关键字声子、量子、计算机、热量背景轻薄化、小型化是当代计算机发展的一个重要趋势，如今最先进的芯片中含有的晶体管数量已经达到几十亿，甚至上百亿。但是，正如笔者曾在《摩尔定律，是生存还是毁灭？》一文中指出，当晶体管数量达到一定规模后，芯片技术就会面临一些新挑战：发热由于芯片狭小的空间里面的晶体管数量越来越多，所产生的热量也会越来越大，发热问题成为了严重的制约因素。量子效应随着芯片制造工艺进步到10纳米，甚至7纳米，进入了微观量子力学领域，电子的行为将受限于量子的不确定性，隧穿效应发生，晶体管将变得不再可靠。经典计算机的发展正遭遇严峻的挑战，与此同时，科学家们却开始转向量子计算机研究。与传统计算机相比，它在数据存储、传输和信息处理方面，采用了完全不同的方式。那么，量子计算机和经典计算机的本质差异到底是什么呢？笔者在《量子电路制冷器：让量子计算更加可靠！》一文中曾经有过论述。从根本上说，最大的不同就在于：比特位和量子位。比特位在经典的二进制计算机中，信息以“比特”的形式存储在晶体管中。一般来说，一个比特，在某一时刻的状态是确定的，要么是0，要么是1。量子位而在量子计算机中，用于存储信息的是量子位，它可能同时处于“既是0和又是1”的状态，这也被称为“叠加态”。对此，量子力学的创始人之一、奥地利物理学家薛定谔，有过一个很好的比喻：箱子里有一只猫，在宏观世界中它要么是活的，要么是死的。但如果在量子世界中，它同时处于生和死两种状态的叠加。另外，多个量子位会“纠缠”形成一个不可分割的整体，也就是说，你操纵了存储于一个量子位中的信息，相当于操纵了存储于所有“纠缠”量子位中的信息。量子计算机，正是利用了量子纠缠和叠加原理。其计算能力随着可操纵的量子位个数的增加，呈指数式方式增长。它具有超快的并行计算，可以解决以往经典计算机无法解决的大规模计算问题。量子计算机，正成为世界各国战略竞争的焦点和热点。前不久，中国科学家自主研发出了世界上首台具有10个超导量子位的光量子计算机，再次站到了量子计算这一领域的世界最前沿。除此之外，我们还看到了D-Wave量子计算机，以及微软、英特尔、IBM、谷歌等国际大公司都纷纷投入量子计算机研发。在惊喜于量子计算机的强大之处后，我们也要冷静观察一下，量子计算机会遭遇什么样的瓶颈？前不久，笔者也是在《量子电路制冷器：让量子计算更加可靠！》这篇文章中曾指出：量子位对于外界环境的条件，特别是热量很敏感。这也就是说热量等外界环境因素的变化，会对量子计算机计算的准确性和可靠性，产生不利影响。同时，这篇文章中也介绍了一种利用制冷器冷却量子位的方法。但是，总体来说，冷却量子计算机并不是一件容易的事。如果要将D-Wave这样的量子计算机冷却到绝对零度，那么需要的设备估计要占满整个房间。这时，我们不禁要问，除此之外，还有什么创新思路吗？创新美国亚利桑那大学材料科学和工程专业的教授 Pierre Deymier 进行的创新探索，为我们开辟了一条创新道路。他和他的研究团队正在设计一种新型的量子计算机，它是通过声音，而不是量子粒子来处理信息。这种新型计算机，不仅能像现有的量子计算机一样工作，还可以战胜现有量子计算机所遭遇的重大挑战即对于外部环境例如热量敏感。技术说到这里，我们还是从技术层面，首先介绍一下声子学，Pierre Deymier 教授是声子学领域的先驱。他曾经用不同于自然的方式，对于声波进行弯曲。该技术可用于消除噪音，治疗疾病，提供新型能量，以及计算和信息处理。下面这张图，展示了这项技术用到的实验装置，即激光超声波装置。通过该实验装置，科学家可创建出不同于自然特征的声子。这项技术可用于噪音消除、超声波成像、和信息处理方面。声子说到这里，作为一门新兴学科，很多人也许还是要问，什么是声子学（phononics）？简单的说，声子学是研究如何利用声子作为能量和信息的载体，进行调控和处理的科学。一般来说，我们见到信息载体是电子和光子，而声子往往被认为对信息传输有害，为什么这么说呢？或许，可以用交通来打个比方，把声子比喻成“行人”，而电子比喻为“汽车”。声子与电子很像，也会和电子相互作用。行人不守交通规则，乱穿马路，如同声子杂乱无章的运动着，迫使马路上的“汽车”即电子减速。最终最终增加了电阻，不仅消耗了能源，还限制了芯片的速度。若将导体冷却到足够低的温度，就会出现零电阻的超导现象。从声子的角度，这一现象可以解释为：如果温度足够低，那么声子将几乎消失。此时，导体就像深夜无人的马路，电子则可以畅行无阻。声子（Phonon）也被称为热晶体，是晶体中晶体结构集体激发的准粒子，化学势为零，服从玻色-爱因斯坦统计，是一种玻色子。声子本身并不具有物理动量，但是携带有准动量，并具有能量（其中为约化普朗克常数）。声子是一种非真实的准粒子，是用来描述晶体原子热振动即晶格振动规律的一种能量量子。声子可以被理解为分子热振动能量的具象化，在半导体材料里，声子流就是热流，声子传播着声音和热量。所以，声子也会具有量子特性，下面介绍一下日本科学家曾经在这方面的发现：2015年，大阪大学的一个研究小组，通过利用放置在离子阱内使得带电粒子的运动空间被限制住的冷却的钙离子，成功地观察到在预定时间内的双声子的量子干涉。使用两个光子或原子的粒子对的量子干涉实验已有一些相关报道，但这个研究小组的成就是使用了两个声子在世界上第一个观察到这种现象。声子位 （Phi-Bits）Pierre Deymier 教授和他的研究团队，正在开发一种基于声子的原型计算机。他将这种新的信息存储和处理方式为 “phase-bits” 或者 “phi-bits”，笔者暂时译为“声子位”。他和量子位（qubits）有点类似，其中的信息也是以叠加态的形式出现，多个声子位会纠缠成一个不可分割的整体，类似于量子位纠缠。但是不同于量子位，声子位对于外界环境例如热量，没有那么敏感。对此，Deymier 教授自豪的说：“我可以在实验中，以室温条件创造声子。”另外，Deymier 教授也申请了关于声子位 “phi-bits”的多个专利，也包括这个量子计算机本身。价值声子位和量子位一样，具有量子纠缠和叠加的特点。所以，我们可以想象：如果有100万个声子位，每个都是“既是0又是1”的状态，那么计算机可以处理的信息量将是2的100万次方。这个数字是非常惊人的，这将是一个十分巨大的天文数字。所以说，声子计算机也具有令人叹为观止的强大计算能力。对于声子计算机的应用价值，我们先来看看Deymier 教授的评价：“基于声子的计算机能够改变我们对于世界的认识，不仅构建了更加强大的计算机，而且还可应用于人工智能、密码学和大数据分析等领域。例如，声子计算机能够迅速映射出人体的完整基因，从而开发更具针对性的医疗方法。”迄今为止，大部分的科技进展都是基于电子和光子的。然而，声子作为一项新兴科学，将会促进许多学科的发展，例如量子物理和力学、材料科学以及应用数学。Deymier 教授乐观地认为，在未来10年，通过声子进行量子计算将成为现实。--------------------------好了，所有的内容就是这些了。做一档科普类的节目，我的语速放的很慢，希望我的普通话不至于吓到你。请务必留出点时间关个注、点个赞或者留个言，这样会给我把节目做的更好的动力。交流讨论请关注微信公众号 丘孔语论 ，微信号是qiukong365 ，也可以扫描语音下面的二维码关注。丘孔语论，倒过来念就是 论语孔丘 ，聪明如你，知道这四个字怎么写吗？

A phonon.. that's not a spelling mistake... is a quantum of vibration. it's a particle... that lives as a vibration in a crystal.  and it's bananas!!! Doctors Fiona Burnell and Darren Peets have joined me to try to explain this all to Megan and Anthony Leon.

Schwerpunkt: Ralf Srama vom Institut für Raumfahrtsysteme der Uni Stuttgart über interstellaren Staub. Nachrichten: Quasi-Atome, Hydroxyl in der Atmosphäre, Händigkeit von Molekülen. Veranstaltungshinweise: Bonn und Saarbrücken.

Lecture 6 in a series of 21 lectures on solid state physics, delivered by Professor Steven H. Simon in early 2014.

This lecture continues with reciprocal space and Bragg condition which determines the diffraction patterns in crystals. It also provides the mathematical proof of Bragg condition, and discusses the energy on atomic vibration of crystals and phonons.

De Roeck, W (Universität Heidelberg) Wednesday 19 September 2012, 16:10-16:50

(June 19th, 2012) David Reis talks about Phonon spectroscopy and its utilization of X-rays. He explains what Phonons are and discusses how they can be visualized after interacting with X-rays.

In this thesis, I report on the cooling of a macroscopic harmonic mechanical oscillator of mass on the order of 10ng close to its quantum ground state. To perform the refrigeration, we exploit the optomechanical interaction that couples the mechanical degree of freedom to an optical cavity mode via the light's radiation pressure. The delayed response of the intracavity field upon mechanical vibration leads to a viscous intracavity radiation pressure force responsible for the dynamical backaction cooling, as is theoretically introduced in chapter 1. In chapter 2, we review the experimental system accommodating this process: the silica microtoroidal cavity. It advantageously hosts a significant optomechanical coupling between the supported high-finesse (close to 10^6) optical whispering-gallery modes and the mechanical radial breathing mode oscillating at radio frequencies (tens of MHz). In chapter 3, we detail the experimental efforts performed to improve the effect of the cooling on the system and thus to reach a lower average number of mechanical energy quanta, or phonons. The various sources of mechanical dissipations are studied. Their magnitude is diminished by optimizing the mechanical structure, therefore reducing the coupling of the mechanical mode to its warm thermal environment. In the newly developed spoke-anchored toroidal microcavities, engineering the intermode coupling minimizes the system’s damping down to the limit imposed by the properties of the vitreous silica material. To reduce the temperature of the environment itself, the experiment is pre-cooled first in a prototype helium-4 cryostat. This enables the observation of novel dispersive optical properties of fused silica and the study of the sample's thermalization at cryogenic temperatures. To further increase the pre-cooling, the setup is finally implemented in a colder helium-3 cryostat operated at 850mK. Using the balanced homodyne interferometer constructed to detect the mechanical vibration with quantum-limited sensitivity, we report on the cooling performed in the resolved-sideband configuration that is fundamentally required to reach the ground state. A mean phonon occupancy of 9 +/-1 is achieved. The fact that only simple technical problems limit further cooling proves that the developed experimental system is finally optimized for revealing quantum signatures of a macroscopic mechanical oscillator cooled by dynamical backaction. Finally, the effect of the optomechanical interaction on the optical properties of the cavity is measured and analyzed, leading to the first observation of optomechanically induced transparency. This constitutes an experimental manifestation of the mutual character of interaction between light and mechanical motion.

Big Ideas presents Seth Lloyd of the Massachusetts Institute for Technology on Quantum Life, how organisms have evolved to make use of quantum effects.

Big Ideas presents Seth Lloyd of the Massachusetts Institute for Technology on Quantum Life, how organisms have evolved to make use of quantum effects.

Big Ideas presents Seth Lloyd of the Massachusetts Institute for Technology on Quantum Life, how organisms have evolved to make use of quantum effects.

Fri, 4 Feb 2011 12:00:00 +0100 https://edoc.ub.uni-muenchen.de/12715/ https://edoc.ub.uni-muenchen.de/12715/1/Knuenz_Sebastian.pdf Knünz, Sebastian ddc:530, ddc:500, Fakultät für Physik

The CRESST (Cryogenic Rare Event Search with Superconducting Thermometers) Dark Matter search is aiming to directly detect Weakly Interacting Massive Particles (WIMPs) via their elastic scattering off nuclei in a target. Due to the low event rate expected for WIMP-nucleus scattering the suppression of background which would hide or mimic the WIMP signal is of crucial importance. Moreover, since the energy transferred to a nucleus in a WIMP-nucleus elastic scattering is extremely low (a few tens of keV), the energy threshold and the sensitivity of detectors are additional fundamental issues in a Dark Matter search. CRESST detectors consist of a 300g CaWO4 scintillating crystal operated as a cryogenic calorimeter in close proximity to a second much smaller cryogenic calorimeter used to detect the scintillation light produced in the target crystal. The lower light yield of nuclear recoils, caused by neutrons and WIMPs, with respect to electron recoils resulting from alpha, beta and gamma interactions is used to identify the event in the scintillating absorber. In the second phase of the CRESST experiment, active background suppression is achieved by the simultaneous measurement of a phonon and a light signal from a scintillating cryogenic calorimeter. Passive background suppression is achieved by operating CRESST detectors in a low background facility located in a deep underground site. About 1% of the energy deposited in CaWO4 by beta or gamma interactions can be detected as scintillation light; therefore the sensitivity of light detectors is a fundamental issue for the discrimination of electron recoils from nuclear recoils at energies relevant for WIMP searches. This work reports on the development of extremely sensitive cryogenic calorimeters for the detection of the scintillation light. These detectors applied a new thermometer geometry characterized by phonon collectors and a thin film thermal coupling to the heat sink. This concept allows a high sensitivity by decoupling the area required for the collection of non-thermal phonons and the heat capacity of the sensor and permits to make the thermal relaxation time of the thermometer long enough to allow for the integration of the scintillation light, despite the slow light emission of CaWO4 at low temperature. Results on new materials to be used as absorbers for a new generation of light detectors are presented. First competitive limits on WIMP Dark Matter established by the CRESST experiment running scintillating CaWO4 cryogenic detectors in association with the light detectors developed in the course of this work are reported together with main results of the detector prototyping phase.

Thu, 19 Dec 2002 12:00:00 +0100 https://edoc.ub.uni-muenchen.de/772/ https://edoc.ub.uni-muenchen.de/772/1/Dunaevskiy_Alexander.pdf Dunaevskiy, Alexander ddc:530, ddc:500,

Thu, 28 Jul 1977 12:00:00 +0100 https://edoc.ub.uni-muenchen.de/9549/ https://edoc.ub.uni-muenchen.de/9549/1/Nippus_Michael.pdf Nippus, Michael ddc:530, ddc:500, Fakultät für Physik