ECLOUD10

Session

Electron Cloud Diagnostics and Measurements

F

Oct 11, 2010, 2:30 PM

Cornell University Statler Hotel

15. Electron Cloud Studies in the Fermilab Main Injector using Microwave Transmission

Dr jayakar thangaraj (Fermilab)

10/11/10, 2:30 PM

Oral Sessions

In this paper, we present recent results from our measurement at the Fermilab Main Injector through microwave transmission in a beam pipe. We present three types of measurement techniques. In the first technique, we use time-resolved direct phase shift measurement to measure the e-cloud density. In the second and third techniques, we look for side bands in the frequency spectrum with or...

30. TE Wave Measurements at Cesr-TA

Dr Stefano De Santis (LBNL)

10/11/10, 3:00 PM

Oral Sessions

TE wave transmission is currently used as a diagnostic tool for measurements of the electron cloud density in several regions of the Cesr-TA ring. While the method is conceptually well established, a number of effects contribute to making a quantitative estimate of the density not straightforward. We report on the measurements currently performed during Cesr-TA experimental runs, describe...

14. The Ecloud Measurement Setup in the Main Injector

Dr Cheng-Yang Tan (Fermilab)

10/11/10, 3:30 PM

Oral Sessions

An ecloud measurement setup was installed in a straight section of the Main Injector in 2009. The goal of the setup was to compare the characteristics of different beam pipe coatings when subjected to proton beam. The setup consists of one coated and one uncoated beam pipe with the same physical dimensions installed at the same location. Four RFAs (retarding field analysers) and two BPMs (used...

12. Analysis of the electron cloud density measurement with RFA in a positron ring

Ken-ichi Kanazawa (KEK)

10/11/10, 4:30 PM

Oral Sessions

In a positron ring such as KEKB LER, clouding electrons receive an almost instantaneous kick from circulating bunches. Therefore, high energy electrons in the cloud are produced just after the interaction with the bunch locally around the beam. The authors gave an estimation of their density using a high energy electron current measured with RFA and a calculated volume neglecting their initial...

7. COLDDIAG: a cold vacuum chamber for diagnostics

Mr Stefan Gerstl (Karlsruhe Institute of Technology (KIT))

10/11/10, 5:00 PM

Oral Sessions

One of the still open issues for the development of superconducting insertion devices is the understanding of the heat load induced by the beam passage. With the aim of measuring the beam heat load to a cold bore and in order to gain a deeper understanding in the beam heat load mechanisms, a cold vacuum chamber for diagnostics is under construction. We plan to have access with the same set-up...

51. Electron cloud generation, trapping and ejection from quadrupoles at the Los Alamos PSR

Dr Robert Macek (LANL and TechSource, Inc.)

10/11/10, 5:30 PM

Oral Sessions

Since the ECLOUD’07 workshop, our electron cloud studies have focused on understanding the main sources and locations of electron clouds (EC), which drive the observed e-p instability. Significant EC signals are observed in drift spaces and quadrupole magnets at PSR which together cover ~65% of the ring circumference. Measurements using the EC diagnostic in a quadrupole have also shown...