Magnetic field of superconductive in-vacuo undulators in comparison with permanent magnet undulators

During the last few years superconductive undulators with a period length of 3.8 mm and 14 mm have been built. In this paper scaling laws for these novel insertion devices are presented: a simple analytic formula is derived which describes the achievable magnetic field of a superconcuctive undulator as a function of gap-width and period length.Comment: Accepted for publication in Nuclear Instruments and Methods in Physics Research, Section

Challenges in measuring "connectedness to nature" among indigenous children: lessons from the Negev Bedouin

Culturally adapted tools for measuring connectedness to nature are important, since attitudes and perceptions toward nature cannot be universalized. They are influenced by a wide range of factors, like individuals’ experience in their home environment, safety concerns and a variety of other sociocultural factors. The purpose of this paper is to introduce a model for a cultural adaptation process, through which suitable nature connectedness questionnaires can be created. Our approach is based on “Third Space Theory,” which laid the groundwork for the development of culturally adapted questionnaires that combine Western categories for measuring nature connectedness with elements that specifically reflect the local culture of an indigenous community. The paper details the adaptation process of a questionnaire designed to learn about the nature connectedness of 5th grade students living in unrecognized Bedouin villages in the Negev Desert. The process enlisted the input of 58 fifth grade students (28 boys and 30 girls) and four professionals from the fields of education and environmental education. It incorporated two different types of interviews, personal, semi-structured interviews, and interviews with small groups of students as they orally completed different iterations of the questionnaire. Thematic content analysis was conducted to reveal the various sociocultural aspects of the relationship between Bedouin children and their natural environment. The results of the paper include: (a) the seven-stage development process of the culturally adapted nature connectedness questionnaire, and (b) examples of the types of information that the culturally adapted questionnaire reveals, which a standard nature connectedness questionnaire might not provide

Indigenous children's connectedness to nature: the potential influence of culture, gender and exposure to a contaminated environment

This study investigates the concept of “connectedness to nature” among students from an indigenous Bedouin community, whose relationship with nature is influenced by a variety of cultural, social and environmental factors, not least of which is the fact that the environment in which they live is highly contaminated. We asked 294 fifth- and sixth-grade students (130 boys and 164 girls), who live in the highly rural Bedouin villages in Israel’s Negev desert, to complete an open questionnaire that was specifically designed to elicit detailed information about these particular students’ connection to nature. The paper presents the results of two analyses of this questionnaire. The first—a quantitative analysis—divides the students’ answers into five aspects of connectedness to nature (nature enjoyment, empathy for living creatures, sense of oneness, sense of responsibility and experience of nature in my immediate environment). The second—an inductive, qualitative analysis of the students’ explanations and elaborations of their answers—provides a more nuanced description of the various social, historical and situational factors that influence these students’ relationship with their environment. It then addresses the tension between these two analyses, highlighting the limitations of “traditional” categories of nature connectedness while showing how these can nevertheless be used to elicit detailed, complex and pertinent information. It concludes by demonstrating how this information, if analyzed critically through its correspondence, or lack of correspondence, with the original assumptions of the statements that elicited it, might be used in the development of place-based environmental education programs for specific populations

Coupled-Bunch Beam Breakup due to Resistive-Wall Wake

The coupled-bunch beam breakup problem excited by the resistive wall wake is formulated. An approximate analytic method of finding the asymptotic behavior of the transverse bunch displacement is developed and solved.Comment: 8 page

Fel Potential of the High Current Erls at Bnl.

An ampere class 20 MeV superconducting Energy Recovery Linac (ERL) is under construction at Brookhaven National Laboratory (BNL) for testing concepts for high-energy electron cooling and electron-ion colliders. This ERL prototype will be used as a test bed to study issues relevant for very high current ERLs. High average current and high performance of electron beam with some additional components make this ERL an excellent driver for high power far infrared Free Electron Laser (FEL). A possibility for future up-grade to a two-pass ERL is considered. We present the status and our plans for construction and commissioning of the ERL. We discus a FEL potential based on electron beam provided by BNL ERL

The landscape of molecular chaperones across human tissues reveals a layered architecture of core and variable chaperones

The sensitivity of the protein-folding environment to chaperone disruption can be highly tissue-specific. Yet, the organization of the chaperone system across physiological human tissues has received little attention. Through computational analyses of large-scale tissue transcriptomes, we unveil that the chaperone system is composed of core elements that are uniformly expressed across tissues, and variable elements that are differentially expressed to fit with tissue-specific requirements. We demonstrate via a proteomic analysis that the muscle-specific signature is functional and conserved. Core chaperones are significantly more abundant across tissues and more important for cell survival than variable chaperones. Together with variable chaperones, they form tissue-specific functional networks. Analysis of human organ development and aging brain transcriptomes reveals that these functional networks are established in development and decline with age. In this work, we expand the known functional organization of de novo versus stress-inducible eukaryotic chaperones into a layered core-variable architecture in multi-cellular organisms

Depressed electron collector for the Gatling Gun Test Stand

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Extreme Ultraviolet (EUV) Sources for Lithography based on Synchrotron Radiation

The study presented here was initiated by a discussion to investigate the possibility of using synchrotron radiation as a source for the Next Generation Lithography (NGL) based on the EUV-concept (Extreme Ultra-Violet; here 13.5 nm or 11.3 nm radiation, respectively). The requirements are: 50 W, 2% bandwidth and minimal power outside this bandwidth. Three options were investigated. The first two deal with radiation from bending magnets and undulators. The results confirm the earlier work by Oxfords Instrument and others that these light-sources lack in-band power while emitting excessive out-of-band radiation. The third approach is a FEL (Free Electron Laser) driven by a 500 MeV linear accelerator with a superconducting mini-undulator as radiation emitting device. Such a device would produce in-band EUV-power in excess of 50 W with negligible out-of-band power.Comment: Submitted to Nuclear Instruments and Methods