Heavy beam loading in the PEP-II B Factory along with large ring circumferences places unique requirements upon the low-level RF (LLRF) system. RF feedback loops must reduce the impedance observed by the beam while ignoring the cavity transients caused by the ion clearing gap. Special attention must be placed on the cavity tuner loops to allow matching the ion clearing gap transients in the hig...

The ancient epic is composed of mythical, fairy-tale, and legendary events, which to a certain extent artistically imagine the thinking, consciousness, beliefs, worldview people first community. In network heritages this category, there are fantasy scenes, mythical concepts about creation, plots during transition from era matriarchy patriarchy, hunting profession, belief in witchcraft, dreams v...

While the effect of service learning in technology-based curriculum has been documented, it is as yet unknown what benefits or challenges are felt by the students when the technologies being applied in their service learning course lie in the research domain. We investigate these questions through a study carried out in the context of a service learning program called EPICS, in which teams of u...

The Duke FEL storage ring is a 1Gev electron ring, which is designed for driving UV-VUV free electron lasers. The ring has been in operation since November of 1994 [1] but the beam position monitors (BPMs) were connected and operated just recently. The BPM pick-ups are 4 stripline electrodes. In order to reduce the higher-order-mode loss excited by the stored beam at the BPM pick-up area, the B...

Recently the Chinese Academy of Sciences has chosen BEPCII as the future development of the Beijing Electron Positron Collider (BEPC), i.e. upgrade of both the machine and detector. The luminosity of the machine is expected to increase to 1.0x10cms. The project will be started at the beginning of 2002 and finished within 3-4 years. The BEPC control system was built in 1987 and upgraded in 1994....

The Advanced Photon Source is now in its fifth year of routine beam production. The EPICS-based [1] control system has entered the phase in its life cycle where new control algorithms must be implemented under increasingly stringent operational and reliability requirements. The sheer volume of the control system (~270,000 records, ~145 VME-based input-output controllers (IOCs), and ~7,000,000 l...

The article is devoted to the heroic image in national epic «David of Sasun», which an ancient Armenian epic, as well pinnacle classical folk literature. subject study four generations Sasun. purpose this typological features heroes Sasun, explain their origin and transformation characters due territorial features. shows that a large extent they are similar images early Homer's with primitive c...

The commissioning of the Swiss Light Source (SLS) started in Feb. 2000 with the Linac, continued in May 2000 with the booster synchrotron and by Dec. 2000 first light in the storage ring were produced. The first four beam lines had to be operational by August 2001. The thorough integration of all subsystems to the control system and a high level of automation was prerequisite to meet the tight ...

The commissioning of the Swiss Light Source (SLS) started in Feb. 2000 with the Linac, continued in May 2000 with the booster synchrotron and by Dec. 2000 first light in the storage ring were produced. The first four beam lines had to be operational by August 2001. The thorough integration of all subsystems to the control system and a high level of automation was prerequisite to meet the tight ...

After the successful accomplishment of vacuum commissioning assisted by vacuum vessel baking and glow discharge cleaning, KSTAR had shifted to the cool-down phase in April 2, 2008 and completed cooling of all superconducting coils and structures down to the operation temperature of 4.5K for about a month by the helium refrigerator system with 9KW cooling capacity. For the next a month, all supe...