Sam Pitman
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View article: Experimental Observation of Proton Bunch Modulation in a Plasma at Varying Plasma Densities
Experimental Observation of Proton Bunch Modulation in a Plasma at Varying Plasma Densities Open
We give direct experimental evidence for the observation of the full transverse self-modulation of a long, relativistic proton bunch propagating through a dense plasma. The bunch exits the plasma with a periodic density modulation resultin…
View article: Experimental Observation of Plasma Wakefield Growth Driven by the Seeded Self-Modulation of a Proton Bunch
Experimental Observation of Plasma Wakefield Growth Driven by the Seeded Self-Modulation of a Proton Bunch Open
We measure the effects of transverse wakefields driven by a relativistic proton bunch in plasma with densities of 2.1×10^{14} and 7.7×10^{14} electrons/cm^{3}. We show that these wakefields periodically defocus the proton bunch itself, con…
View article: Optimisation studies for a high gradient proton Linac for application in proton imaging
Optimisation studies for a high gradient proton Linac for application in proton imaging Open
Proton beam therapy is an alternative to traditional X-ray radiotherapy utilised especially for paediatric malignancies and radio-resistant tumours; it allows a precise tumour irradiation, but is currently limited by knowledge of the patie…
View article: High Power Conditioning of X-Band Variable Power Splitter and Phase Shifter
High Power Conditioning of X-Band Variable Power Splitter and Phase Shifter Open
The three X-band test facilities currently at CERN aim at qualifying CLIC structures prototypes but are also exten- sively used to qualify X-band components operation at high power. In order to upgrade one of the facilities from a single t…
View article: The PolariX-TDS Project: Bead-Pull Measurements and High-Power Test on the Prototype
The PolariX-TDS Project: Bead-Pull Measurements and High-Power Test on the Prototype Open
A collaboration between DESY, PSI and CERN has been established to develop and build an advanced modular X- band transverse deflection structure (TDS) system with the new feature of providing variable polarization of the deflecting force. …
View article: Dark Current Analysis at CERN’s X-band Facility
Dark Current Analysis at CERN’s X-band Facility Open
Dark current is particularly relevant during operation in high-gradient linear accelerators. Resulting from the capture of field emitted electrons, dark current produces additional radiation that needs to be accounted for in experiments. I…
View article: Status of the CLEAR Electron Beam User Facility at CERN
Status of the CLEAR Electron Beam User Facility at CERN Open
The CERN Linear Electron Accelerator for Research (CLEAR) has now finished its second year of operation, providing a testbed for new accelerator technologies and a versatile radiation source. Hosting a varied experimental program, this bea…
View article: Connection of 12 GHz High Power RF from the XBOX 1 High Gradient Test Stand to the CLEAR Electron LINAC
Connection of 12 GHz High Power RF from the XBOX 1 High Gradient Test Stand to the CLEAR Electron LINAC Open
A new RF system is being established at XBOX1 to drive two §I{100}{MV/m} CLIC structures in the CLEAR electron linac. In the past, these structures had been powered by RF from PET structures excited by a drive beam. This drive beam is no l…
View article: Experimental observation of proton bunch modulation in a plasma, at varying plasma densities
Experimental observation of proton bunch modulation in a plasma, at varying plasma densities Open
We give direct experimental evidence for the observation of the full transverse self-modulation of a relativistic proton bunch propagating through a dense plasma. The bunch exits the plasma with a density modulation resulting from radial w…
View article: Acceleration of electrons in the plasma wakefield of a proton bunch
Acceleration of electrons in the plasma wakefield of a proton bunch Open
View article: The electron accelerators for the AWAKE experiment at CERN—Baseline and Future Developments
The electron accelerators for the AWAKE experiment at CERN—Baseline and Future Developments Open
The AWAKE collaboration prepares a proton driven plasma wakefield acceleration experiment using the SPS beam at CERN. A long proton bunch extracted from the SPS interacts with a high power laser and a 10 m long rubidium vapor plasma cell t…
View article: High Gradient Performance of an S-Band Backward Traveling Wave Accelerating Structure for Medical Hadron Therapy Accelerators
High Gradient Performance of an S-Band Backward Traveling Wave Accelerating Structure for Medical Hadron Therapy Accelerators Open
The high-gradient performance of an accelerating structure prototype for a medical proton linac is presented. The structure was designed and built using technology developed by the CLIC collaboration and the target application is the TULIP…
View article: Development of an High Gradient Side Coupled Cavity for PROBE
Development of an High Gradient Side Coupled Cavity for PROBE Open
The PROBE project aims to develop a high gradient proton accelerator for protons with energy around 250-350 MeV for proton radiography. Detailed studies have shown that the optimum design is a side coupled cavity at S-band. With an apertur…
View article: High Power Conditioning of X-Band RF Components
High Power Conditioning of X-Band RF Components Open
As part of the effort to qualify CLIC accelerating struc-tures prototypes, new X-band test facilities have been built and commissioned at CERN in the last years. In this context, a number of RF components have been designed and manufacture…
View article: Coupled Longitudinal and Transverse Beam Dynamics Studies for Hadron Therapy Linacs
Coupled Longitudinal and Transverse Beam Dynamics Studies for Hadron Therapy Linacs Open
Precise proton therapy planning can be assisted by augmenting conventional medical imaging techniques with proton computed tomography (pCT). For adults this requires an incident proton energy up to at least 330 MeV, an energy not readily a…
View article: ProBE: Proton Boosting Extension for Imaging and Therapy
ProBE: Proton Boosting Extension for Imaging and Therapy Open
The ProBE linac aims at accelerating protons from a particle therapy cyclotron to the c.330 MeV required for proton tomography. To obtain the c. 55 MV/m gradients required to achieve 100 MeV gain in a suitably short distance, we propose th…
View article: ProBE: Proton Boosting Extension for Imaging and Therapy
ProBE: Proton Boosting Extension for Imaging and Therapy Open
Proton beam therapy has been shown to be a promising alternative to traditional radiotherapy, especially for paedi- atric malignancies and radio-resistant tumours. Allowing a highly precise tumour irradiation, it is currently limited by ra…
View article: ProTec - A Normal-conducting Cyclinac for Proton Therapy Research and Radioisotope Production
ProTec - A Normal-conducting Cyclinac for Proton Therapy Research and Radioisotope Production Open
The ProTec cyclinac proposes the use of a 24 MeV high-current cyclotron to inject protons into a normal-conducting linac pulsed at up to 1 kHz to give energies up to 150 MeV. As well as being able to produce radioisotopes such as 99mTc, th…