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Dive into the research topics where Adam Jeff is active.

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Featured researches published by Adam Jeff.


Proceedings of SPIE | 2010

Spatial and temporal beam profiles for the LHC using synchrotron light

Adam Jeff; S. Bart Pedersen; A. Boccardi; E. Bravin; A.S. Fisher; A. Guerrero Ollacarizqueta; T. Lefevre; A. Rabiller; Carsten Welsch

Synchrotron radiation is emitted whenever a beam of charged particles passes though a magnetic field. The power emitted is strongly dependent on the relativistic Lorentz factor of the particles, which itself is proportional to the beam energy and inversely proportional to the particle rest mass. Thus, synchrotron radiation is usually associated with electron accelerators, which are commonly used as light sources. However the largest proton machines reach sufficiently high energies to make synchrotron light useful for diagnostic purposes. The Large Hadron Collider at CERN will accelerate protons up to an energy of 7TeV. An optical arrangement has been made which focuses synchrotron light from two LHC magnets to image the cross-section of the beam. It is also planned to use this setup to produce a longitudinal profile of the beam by use of fast Single Photon Counting. This is complicated by the bunched nature of the beam which needs to be measured with a very large dynamic range. In this contribution we present early experimental data of the transverse LHC beam profile together with a scheme for measuring the longitudinal profile with a time resolution of 50 ps. It includes the use of a gating regime to increase the dynamic range of the photon counter and a three-stage correction algorithm to compensate for the detectors deadtime, afterpulsing and pile-up effects.


Proceedings of the 12th International Conference on Low Energy Antiproton Physics (LEAP2016) | 2017

Physical Society of Japan : Beam diagnostics for low energy antiprotons

Carsten Welsch; H. Zhang; Adam Jeff; M. Putignano; Miguel Fernandes; Javier Resta-Lopez; J. Harasimowicz; Vasilis Tzoganis; Alexandra Alexandrova; James Hunt; Alejandro Sosa

This paper presents a comprehensive set of beam diagnostics that has been developed to characterize low energy antiproton and ion beams (during initial machine commissioning) and subsequent facility operation. It shows results from simulations and experiments using invasive and non-invasive monitors for absolute beam current measurements; capacitive pickups for position detection; scintillating screens, secondary emission monitors and micro channel plate detectors for transverse profile monitoring, as well as an ultra-cold gas jet for minimally-invasive profile measurements and in-ring experiments. The identified limits are discussed for each technique, and options for further improvements are indicated.


Conf.Proc.C100523:MOPE057,2010 | 2010

First Beam Measurements with the LHC Synchrotron Light Monitors

T. Lefevre; E. Bravin; Gerard Burtin; Ana Guerrero; Adam Jeff; A. Rabiller; Federico Roncarolo; Alan Fisher


Vacuum | 2014

Gas dynamics considerations in a non-invasive profile monitor for charged particle beams

Vasilis Tzoganis; Adam Jeff; Carsten Welsch


Conf.Proc.C100523:WEPEB072,2010 | 2010

First Operation of the Abort Gap Monitors for LHC

T. Lefevre; Stephane Bart Pedersen; A. Boccardi; E. Bravin; A. Goldblatt; Adam Jeff; Federico Roncarolo; A.S. Fisher


Presented at | 2011

First Measurement Results of the LHC Longitudinal Density Monitor

Carsten Welsch; A.S. Fisher; Adam Jeff; T. Lefevre; A. Rabiller; A. Boccardi; M. Andersen; E. Bravin; S. Bozyigit; Federico Roncarolo


Physical review accelerators and beams | 2017

APS : Design and first operation of a supersonic gas jet based beam profile monitor

Vasilis Tzoganis; Hao D Zhang; Adam Jeff; Carsten Welsch


Archive | 2013

A GAS-JET PROFILE MONITOR FOR THE CLIC DRIVE BEAM

Adam Jeff; Eva Barbara Holzer; Tzoganis; T. Lefevre; Carsten Welsch


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2011

First results of the LHC longitudinal density monitor

Adam Jeff; A. Boccardi; E. Bravin; A.S. Fisher; T. Lefevre; A. Rabiller; Federico Roncarolo; Carsten Welsch


Presented at | 2010

First Operation of the Abort Gap Monitor for LHC

T. Lefevre; A. Goldblatt; Adam Jeff; Alan Fisher; E. Bravin; A. Boccardi; Federico Roncarolo; Stephane Bart Pedersen

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H. Zhang

University of Liverpool

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