21 research outputs found
A Lightweight Field Cage for a Large TPC Prototype for the ILC
We have developed and constructed the field cage of a prototype Time
Projection Chamber for research and development studies for a detector at the
International Linear Collider. This prototype has an inner diameter of 72 cm
and a length of 61 cm. The design of the field cage wall was optimized for a
low material budget of 1.21 % of a radiation length and a drift field
homogeneity of Delta(E)/(E) less or equal 10^-4. Since November 2008 the
prototype has been part of a comprehensive test beam setup at DESY and used as
a test chamber for the development of Micro Pattern Gas Detector based readout
devices.Comment: 16 pages, 13 figures, 3 table
Beam Test with a GridGEM TPC Prototype Module
The International Large Detector (ILD) --a detector concept for the
International Linear Collider (ILC)-- foresees a Time Projection Chamber (TPC)
as its main tracking detector. Currently, the R&D efforts for such a TPC focus
on studies using a large prototype that can accommodate up to seven read-out
modules which are comparable to the ones that would be used in the final ILD
TPC. The DESY TPC group has developed such a module using GEMs for the gas
amplification, which are mounted on thin ceramic frames. The module design and
first results of a test beam campaign are presented.Comment: 6 pages, 11 figures, prepared for LCWS 2011 proceeding
The ABC130 barrel module prototyping programme for the ATLAS strip tracker
For the Phase-II Upgrade of the ATLAS Detector, its Inner Detector,
consisting of silicon pixel, silicon strip and transition radiation
sub-detectors, will be replaced with an all new 100 % silicon tracker, composed
of a pixel tracker at inner radii and a strip tracker at outer radii. The
future ATLAS strip tracker will include 11,000 silicon sensor modules in the
central region (barrel) and 7,000 modules in the forward region (end-caps),
which are foreseen to be constructed over a period of 3.5 years. The
construction of each module consists of a series of assembly and quality
control steps, which were engineered to be identical for all production sites.
In order to develop the tooling and procedures for assembly and testing of
these modules, two series of major prototyping programs were conducted: an
early program using readout chips designed using a 250 nm fabrication process
(ABCN-25) and a subsequent program using a follow-up chip set made using 130 nm
processing (ABC130 and HCC130 chips). This second generation of readout chips
was used for an extensive prototyping program that produced around 100
barrel-type modules and contributed significantly to the development of the
final module layout. This paper gives an overview of the components used in
ABC130 barrel modules, their assembly procedure and findings resulting from
their tests.Comment: 82 pages, 66 figure
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Research and Design of a Routing Protocol in Large-Scale Wireless Sensor Networks
无线传感器网络,作为全球未来十大技术之一,集成了传感器技术、嵌入式计算技术、分布式信息处理和自组织网技术,可实时感知、采集、处理、传输网络分布区域内的各种信息数据,在军事国防、生物医疗、环境监测、抢险救灾、防恐反恐、危险区域远程控制等领域具有十分广阔的应用前景。 本文研究分析了无线传感器网络的已有路由协议,并针对大规模的无线传感器网络设计了一种树状路由协议,它根据节点地址信息来形成路由,从而简化了复杂繁冗的路由表查找和维护,节省了不必要的开销,提高了路由效率,实现了快速有效的数据传输。 为支持此路由协议本文提出了一种自适应动态地址分配算——ADAR(AdaptiveDynamicAddre...As one of the ten high technologies in the future, wireless sensor network, which is the integration of micro-sensors, embedded computing, modern network and Ad Hoc technologies, can apperceive, collect, process and transmit various information data within the region. It can be used in military defense, biomedical, environmental monitoring, disaster relief, counter-terrorism, remote control of haz...学位:工学硕士院系专业:信息科学与技术学院通信工程系_通信与信息系统学号:2332007115216
Requirements of the support mechanics
Mechanical requirements of the support structure of an ILD TP
Preliminary ideas of a local locking system
R&D studies of an local support and locking system of the endcap Petal
Tools for Placement and Alignment of Modules on Petals
Tools for placing and allignment of modules of the Petalet demonstrator of the Petal endca