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...
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...
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...
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...
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...
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...
