Use of design codes for on-line beam diagnostics at the MIT-Bates Accelerator

The MIT-Bates Accelerator Center consists of a one GeV electron linac with a beam recirculation system, and a storage ring which was initially commissioned in early 1993. For proper operation of this facility, on-line beam measurements and analysis are important. To this end we have developed codes for simulating and measuring beam optics and the transverse beam phase space. One of the beam optics simulators is an extension of the DIMAD based simulator which originated at CEBAF. It has been modified to include the capability of directly reading the machine magnetics values and thereby predict the beam envelope, as well as automatically set up the desired theoretical beam phase space. Two types of on-line transverse phase space measuring codes are in operation. It is envisioned that these phase space measurement systems will eventually be linked with the optics simulator to allow semi-automatic beam tuning procedures. Another code for automatically measuring optical matrix elements has been in use for several years. A description of the codes, their bases and their operation are presented here