Jeff, A, Andersen, M, Boccardi, A, Bozyigit, S, Bravin, E, Lefevre, T, Rabiller, A, Roncarolo, F, Welsch, CP 
ORCID: 0000-0001-7085-0973 and Fisher, AS
(2012)
Longitudinal density monitor for the LHC.
Doctor of Philosophy thesis, University of Liverpool.
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Abstract
The longitudinal density monitor (LDM) is primarily intended for the measurement of the particle population in nominally empty rf buckets. These so-called satellite or ghost bunches can cause problems for machine protection as well as influencing the luminosity calibration of the LHC. The high dynamic range of the system allows measurement of ghost bunches with as little as 0.01% of the main bunch population at the same time as characterization of the main bunches. The LDM is a single-photon counting system using visible synchrotron light. The photon detector is a silicon avalanche photodiode operated in Geiger mode, which allows the longitudinal distribution of the LHC beams to be measured with a resolution of 90ps. Results from the LDM are presented, including a proposed method for constructing a 3-dimensional beam density map by scanning the LDM sensor in the transverse plane. In addition, we present a scheme to improve the sensitivity of the system by using an optical switching technique. © 2012 American Physical Society.
| Item Type: | Thesis (Doctor of Philosophy) |
|---|---|
| Additional Information: | Date: 2012-11 (completed) |
| Uncontrolled Keywords: | LHC, Longitudinal Profile, Single Photon Counting, Beam Instrumentation, Beam Diagnostics, Synchrotron Radiation |
| Subjects: | ?? QC ?? |
| Divisions: | Faculty of Science and Engineering > School of Physical Sciences |
| Depositing User: | Symplectic Admin |
| Date Deposited: | 15 Aug 2013 11:03 |
| Last Modified: | 16 Dec 2022 04:38 |
| DOI: | 10.17638/00009293 |
| Supervisors: |
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| URI: | https://livrepository.liverpool.ac.uk/id/eprint/9293 |
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