Beam Orbit Diagnostics and Control in Candle Storage Ring

Abstract

Stability requirements for the CANDLE light source are the consequence of a small electron beam size and a tolerable photon beam parameters. In a real machine, the components of the storage ring have static and dynamic imperfections, which cause disturbance of the electron beam and consequently photon beams parameters. In the present paper the basic approaches to the beam diagnostics, control and correction issues for the CANDLE facility are given. The algorithms, electronics and processing hardware are described.

An overview of beam diagnostic and control systems for 50 MeV AREAL Linac

“…Figure 4 presents the beam profile at YAG 2 screen. The comparison with spectrometer dispersive characteristics indicates that the image corresponds to 3.7 MeV beam energy and rms energy spread below 2% [6]. During gun section operation the maximum observed energy was 5 MeV.…”

“…When the output signal is terminated to 50 Ω the reading on the oscilloscope is integrated and divided by the termination to give a reading of the charge. In figure 2 the result of beam charge particular measurement is presented [6]. To meet the requirements of conducting experiments it is mandatory to produce electron beams with variable parameters (energy, charge and spot size).…”

“…A beam spot is the main source of information used to monitor and study the beam transport as well as transverse and longitudinal beam distributions. For this purpose two screen stations are allocated in AREAL gun section [6]. In these profile monitors YAG:Ce scintillating crystals are used, since for AREAL electron beam parameters the other systems (such as OTR screen or the wire scanner) would not generate sufficient signal-to-noise ratio.…”

“…The third layer represents an operator interface. The connection between layers is performed via TCP/IP protocol [6].…”