Experimental diagnostics using optical transition radiation at CEBAF
Optical Transition Radiation (OTR) devices have unique properties that allow them to complement the diagnostic tools more commonly used in particle accelerators. CEBAF is designed to produce a continuous electron beam accelerated up to 4 GeV by recirculating it five times through two 400 MeV superconducting linacs. We present two OTR applications that cannot be performed with standard fluorescent screens. The goal of the first one is to provide a multiturn ''viewer'' using the backward OTR emitted from a 0.8 {micro}m thick aluminum foil. The foil must be thin enough to keep most of the beam in the machine after each passage. Looking at the successive turns in the linacs on the same screen will provide a new diagnostic device to help tune the machine. Replacing the ceramic of the present viewers with an Al foil is relatively simple and inexpensive. The preliminary results in single pass are encouraging. The goal of the second OTR application is to measure the emittance of high current continuous beams ({approx}200 {micro}A) of low emittance (5 10{sup -9} mrad) and size (lte 50 {micro}m rms). Standard fluorescent screens or wire scanners cannot withstand such an intense beam.
- Research Organization:
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Sponsoring Organization:
- USDOE Office of Energy Research (ER) (US)
- DOE Contract Number:
- AC05-84ER40150
- OSTI ID:
- 802172
- Report Number(s):
- CEBAF-PR-94-17; DOE/ER/40150-2262; TRN: US200223%%934
- Resource Relation:
- Conference: 6th Beam Instrumentation Workshop (BIW 94), Vancouver, British Columbia (CA), 10/02/1994--10/06/1994; Other Information: AIP Conf. Proc. 333, 224-230 (1995); PBD: 1 Oct 1994
- Country of Publication:
- United States
- Language:
- English
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