Electron-Cloud Effects in past and future machines - walk through 50 years of Electron-Cloud studies

Past electron-cloud (e-cloud) observations, studies and mitigation techniques are quickly reviewed along with some ongoing code developments, the preceding ECLOUD workshops, recent contacts with the spacecraft community, the important role of Francesco Ruggiero, and a few current electron-cloud topics discussed at ECLOUD12 in La Biodola.Comment: 9 pages, contribution to the Joint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effects: ECLOUD'12; 5-9 Jun 2012, La Biodola, Isola d'Elba, Ital

Mitigating performance limitations of single beam-pipe circular e+e- colliders

Renewed interest in circular e+e- colliders has spurred designs of single beam-pipe machines, like the CEPC in China, and double beam pipe ones, such as the FCC-ee effort at CERN. Single beam-pipe designs profit from lower costs but are limited by the number of bunches that can be accommodated in the machine. We analyse these performance limitations and propose a solution that can accommodate O(1000) bunches while keeping more than 90% of the ring with a single beam pipe.Comment: Poster presented at IPAC'15, Richmond, VA, USA, May 201

Benchmarking electron-cloud simulations and pressure measurements at the LHC

During the beam commissioning of the Large Hadron Collider (LHC) with 150, 75, 50 and 25-ns bunch spacing, important electron-cloud effects, like pressure rise, cryogenic heat load, beam instabilities or emittance growth, were observed. A method has been developed to infer different key beam-pipe surface parameters by benchmarking simulations and pressure rise observed in the machine. This method allows us to monitor the scrubbing process (i.e. the reduction of the secondary emission yield as a function of time) in the regions where the vacuum-pressure gauges are located, in order to decide on the most appropriate strategies for machine operation. In this paper we present the methodology and first results from applying this technique to the LHC.Comment: 5 pages, 7 figures, presented at ECLOUD 12: Joint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effects, La Biodola, Isola d Elba, Italy, 5-9 June 201

Ethnic Self-Identification of First-Generation Immigrants

This paper uses the concept of ethnic self-identification of immigrants in a twodimensional framework. It acknowledges the fact that attachments to the home and the host country are not necessarily mutually exclusive. There are three possible paths of adjustment from separation at entry, namely the transitions to assimilation, integration and marginalization. We analyze the determinants of ethnic selfidentification in this process using samples of first-generation immigrants for males and females separately, and controlling for pre- and post-migration characteristics. We find strong gender differences and the unimportance of a wide range of premigration characteristics like religion and education at home.Ethnic self-identification, first-generation immigrants, gender, ethnicity

Labor Mobility and the Integration of European Labor Markets

This paper outlines the importance of labor mobility for the improvement in allocating and distributing economic resources. We are faced with an increasing lack of skilled workers and a growing tendency of unemployment amongst the low-skilled. A central political objective for the future will not only be education policy but also the recruitment of high-skilled workers from international and European labor markets. Additional skilled labor increases well-being and reduces inequality. However, internal European barriers to mobility are difficult to break through. An improved transparency of the European labor market, a greater command of languages and a standardization of the social security system can strengthen mobility. The key to mobility is in promoting the integration of international workers in the European migration process, which can be strengthened through circular migration. The European "blue card" initiative and the opening of labor markets to foreign graduates who have been trained in Europe could set a new course.Migration, migration effects, EU Eastern enlargement, free movement of workers

European Labour Mobility: Challenges and Potentials

European Union economies are pressed by (i) a demographic change that induces population ageing and a decline of the workforce, and (ii) a split labour market that is characterized by high levels of unemployment for low -skilled people and a simultaneous shortage of skilled workers. This lack of flexible high-skilled workers and the aging process has created the image of an immobile labour force and the eurosklerosis phenomenon. In such a situation, an economically motivated immigration policy at the European level can generate welfare improvements. A selective policy that discourages unskilled migrants and attracts skilled foreign workers will vitalize the labour market, foster growth and increase demand for unskilled native workers. The paper summarizes the available economic insights, and suggests (i) the need to harmonize the single -country migration policies across Europe and (ii) that the European Union needs to become an active player on the international labour markets.Labour mobility; Migration; Skilled migration; Unskilled migration; Migration policy; Integration policy

Labor Mobility and the Integration of European Labor Markets

This paper outlines the importance of labor mobility for the improvement in allocating and distributing economic resources. We are faced with an increasing lack of skilled workers and a growing tendency of unemployment amongst the low-skilled. A central political objective for the future will not only be education policy but also the recruitment of high-skilled workers from international and European labor markets. Additional skilled labor increases well-being and reduces inequality. However, internal European barriers to mobility are difficult to break through. An improved transparency of the European labor market, a greater command of languages and a standardization of the social security system can strengthen mobility. The key to mobility is in promoting the integration of international workers in the European migration process, which can be strengthened through circular migration. The European “blue card” initiative and the opening of labor markets to foreign graduates who have been trained in Europe could set a new course.migration, migration effects, EU Eastern enlargement, free movement of workers

Costs and Benefits of Labour Mobility Between the EU and the Eastern Partnership Partner Countries. Country Report: Germany

This study provides an overview of the situation of migrants from Eastern Partnership (EaP) countries in Germany, with this chapter particularly focusing on the labour market integration of EaP migrants, their access to social assistance and social services, and the impact of these flows on the German labour market. We then provide an informed view of the scope for future increased mobility between Germany and EaP countries, in the light of the skills needs and demographic trends expected in the next 10 to 20 years. Based on the results, the following conclusions can be drawn. More than half of EaP migrants come to Germany for work and study purposes. Family reunification is important for Ukrainians and Moldovans. Work and family purposes are the two main residence grounds for migrants from Moldova and Ukraine, while the other nationalities hold residence permits for reasons of study and work in most cases

Work and Money: Payoffs by Ethnic Identity and Gender

Upon arrival in the host country, immigrants undergo a fundamental identity crisis. Their ethnic identity being questioned, they can be classified into four states – assimilation, integration, separation and marginalization. This is suggested by the ethnosizer, a newly established measure to parameterize a person's ethnic identity, using individual information on language, culture, societal interaction, history of migration, and ethnic self-identification. In what state individuals end up varies among immigrants even from the same country. Moreover, the quest for ethnic identity affects women and men differentially. This paper contends that ethnic identity can significantly affect the attachment to and performance of immigrants in the host country labor market, beyond human capital and ethnic origin characteristics. Empirical estimates for immigrants in Germany show that ethnic identity is important for the decision to work and significantly and differentially affects the labor force participation of men and women. Women who exhibit the integrated identity are more likely to work than women who are German assimilated; this does not hold for men. However, once we control for selection in the labor market and a slew of individual and labor market characteristics, ethnic identity does not significantly affect the earnings of men or women immigrant workers.integration, immigrant assimilation, ethnic identity, ethnicity, ethnosizer, ethnic earnings

Modeling microwave/electron-cloud interaction

Starting from the separate codes BI-RME and ECLOUD or PyECLOUD, we are developing a novel joint simulation tool, which models the combined effect of a charged particle beam and of microwaves on an electron cloud. Possible applications include the degradation of microwave transmission in tele-communication satellites by electron clouds; the microwave-transmission tecchniques being used in particle accelerators for the purpose of electroncloud diagnostics; the microwave emission by the electron cloud itself in the presence of a magnetic field; and the possible suppression of electron-cloud formation in an accelerator by injecting microwaves of suitable amplitude and frequency. A few early simulation results are presented.Comment: 3 pages, contribution to the Joint INFN-CERN-EuCARD-AccNet Workshop on Electron-Cloud Effects: ECLOUD'12; 5-9 Jun 2012, La Biodola, Isola d'Elba, Ital