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[en] The Review Committee which studied the document entitled 'The NTF Interlock Box' requested more detailed information on the exact role of the red key labeled NTF Reset and Enable. This document is being written in response to that request. It should be considered an appendix to the earlier document and is best understood if one has already studied the earlier document including its Figures 1 and 2. As before, this is intended to give a basic understanding of how the system works. Detailed information of the type needed to build or repair a module is available on drawings to be specified later. The key plays two distinct roles. First, it is used to secure the NTF radiation areas. Second, it is used to turn on and control the ramp signals to the 58° and 32° magnet power supplies.
[en] Using acoustic resonators, we have investigated the mechanical stiffness of contacts between rough surfaces. In the first part, the underlying acoustic model is validated with experiments showing a transition from elastic to inertial loading. The second part is concerned with the increase in contact stiffness induced by transient exposure to a humid environment. A novel mode of surface deformation is proposed, which builds on a capillary instability. Under certain conditions, a slight decrease in the mean distance between the two surfaces may induce a rather strong increase in capillary attraction, while leaving the elastic forces of repulsion almost constant. The thus-created negative differential spring constant induces a collapse of the gap in-between neighboring load-bearing asperities. The initial decrease in distance may either be induced by local asperity creep or by distortions of the contacting surfaces on a larger scale, which improve the interlock of the asperities at a small cost of strain energy
[en] The China Spallation Neutron Source (CSNS) consists mainly of an H- linac as an injector and a proton rapid cycling synchrotron. Timing system is an important part of CSNS. The timing system prototype developments are based on the Event System 230 series. We use two debug platforms, one is the EPICS base 3.14.8. IOC that uses MVME5100, running vxworks5.5 version; the other is the EPICS base 3.13, using vxworks5.4 version. The prototype includes driver debugging, EVG/EVR-230 experimental new features such as CML output signals using high-frequency step size of the signal cycle delay, the use of interlocking modules, CML, and TTL's Output to achieve interconnection function, and data transmission functions
[en] RF Protection Interlock (RFPI) system has been developed for the protection of high power RF components in LEHIPA. The system consists of six VME64X based modules which processes output of different sensors. The system is designed based on a mezzanine card approach with a common base board and all the function specific boards are mounted on the mezzanine board. After detecting any fault, time required for RFPI system to switch off RF power in the cavities is less than 1μs.This paper describes the sensors used in RF protection Interlock System and the important features of the system. (author)
[en] High availability interlocks and controls are required for the ILC (International Linear Collider) L-Band high power RF stations. A new F3 (Fast Fault Finder) VME module has been developed to process both fast and slow interlocks using FPGA logic to detect the interlock trip excursions. This combination eliminates the need for separate PLC (Programmable Logic Controller) control of slow interlocks. Modules are chained together to accommodate as many inputs as needed. In the next phase of development the F3's will be ported to the new industry standard ATCA (Advanced Telecom Computing Architecture) crate (shelf) via a specially designed VME adapter module with IPMI (Intelligent Platform Management Interface). The goal is to demonstrate auto-failover and hot-swap for future partially redundant systems.
[en] A 4-interleaving cell of 2-dual interlocked cells (DICE) is proposed, which reduces single event induced multiple node collection between the sensitive nodes of sensitive pairs in a DICE storage cell in 65 nm technology. The technique involves the 4-interleaving of dual DICE cells at a layout level to meet the required spacing between sensitive nodes in an area-efficient manner. Radiation experiments using a 65 nm CMOS test chip demonstrate that the LETth of our 4-interleaving cell of dual DICE encounters are almost 4× larger and the SEU cross section per bit for our proposed dual DICE design is almost two orders of magnitude less compared to the reference traditional DICE cell. (paper)
[en] The COMPASS tokamak has started its operation recently at the Institute of Plasma Physics AS CR in Prague, Czech Republic. An important issue of the operation is the interlock system, which secures the safety of the personnel. The personnel protection is based on a restricted access into the experimental hall during the tokamak operation. An experimental hall access system, based on Honeywell WIN-PAKTM2005, allows to set the status of the experimental area and to control the movement of the personnel. A hardware interlock, based on a PLC MicroPEL M66, interprets the experimental hall status and controls the safety of the operation of key systems accordingly. The permit for operation is granted and the real status of the systems is reported by hard-wired potential-less contacts. The PLC provides a HW interface between Actuators (relays and switches) and it is connected on PESNET bus. Second site of personnel protection system is created on a PC where runs a .NET application on MS Windows XP. This PC is connected with PLC via PESNET bus (on RS485 layer) and it creates an operator interface. Details of the set-up are described in this contribution.
[en] Conventional interlock systems rely heavily on hard-wired electromagnetic relays. Although this approach is well understood and has proven to be reliable, several drawbacks plague the designer as well as the repairman. If larger systems have to be implemented in relay logic, the complexity limit is soon reached; the systems become too bulky, and wiring expenses sky-rocket; moreover, the intelligence of those designs is limited in such a way that desirable features such as self-tests have to be left out. Additionally, relay interlocks are inherently inflexible: if the configuration of the system they protect has to change, a disproportional amount of time, work and money has to be invested in order to adapt the hard-wiring of the interlock system to the new requirements. Repair work is often unnecessarily delayed due to the lack of adequate documentation
[en] LHCD system is a important system for the steady state operation of the SST-1 machine. Four numbers of klystrons of 3.7 GHz are used as a microwave source to produce 2 MW of microwave power. This power is launched into the machine to achieve the steady state operation of the SST-1 Machine. A -70kV, 22A high voltage power supply and a solid-state crowbar are procured and tested and validated for its performance separately. Both of the system are integrated and tested for its integrated performance for the safe and reliable test of the klystron tube. A 10J wire test is conducted for the optimum value of the series resistor. This test will validate the integrated performance of power supply, Crowbar and the interlocking circuit. This paper details the optimization of the ballast resistor from 150 ohms to 40 ohms and its successful integration with the klystron tube for its 500kW CW operation. Some operational experience is also shared