Detector with Adjustable Aperture for Electron Beam Monitoring

Recently new high energy electron cooling beam projects, LEReC and CeC, were proposed at BNL as part of a transition to a future electron-ion collider EIC). Both projects are based on new principles and aimed at the improvement of luminosity for EIC operations. Efficient electron cooling of hadron beams requires a high quality high power electron beam with tight parameters energy and space trajectory). In order to achieve and maintain the required parameters of the electron beam, its condition has to be continuously monitored and feedback control has to be developed. Existing beam detectors, however, are not suitable for powerful electron beam profile measurements. For example they cannot survive the direct impact of kW- power electron beams causing a temperature increase of several hundred degrees. The impact of this project is dependent on the unique properties of diamond: low energy absorption, tremendous radiation tolerance, ability to dissipate significant heat load, and stability of electronic properties over a wide temperature range. Recent progress in synthetic diamond CVD growth significantly improved its electronic quality and reduced the cost thus making diamond devices increasingly commercially attractive. Applied Diamond Inc. proposes to develop and evaluate a solid state Diamond Beam Profile Detector DBPD) with adjustable aperture for high intensity electron beam core profile measurement. This diamond detector will have a movable aperture, fast time response, high radiation stability, and ability to operate at high temperatures without cooling, thus allowing its placement inside the beam pipe and into the beam itself. The DBPD will be made from thin diamond equipped with highly B-doped diamond electrical contacts able to operate at high temperatures and while introducing a minimal disturbance to the beam pipe impedance. The DBPD will be driven by an ultra-fast actuator allowing very fast beam scans during tuning and full retraction from the beam pipe during operations. The use of a DBPD for high energyelectron beams would facilitate the beam tuning and lead to longer times between detector maintenance. In addition, a DBPD, having up to 11 orders of magnitude in dynamic range, will be able to map the high intensity halo area around any type of powerful beam proton, ion, etc.). This new diamond beam profile/halo detector would improve data collection in critical areas at the EIC project and could be useful for other DOE accelerator facilities as well, such as LCLS II at SLAC, CEBAF at JLAB, and CBETA test accelerator at Cornell.