Title :
250 GHz cold tests for the LLNL CARM experiment
Author :
Kulke, B. ; Caplan, M. ; Stever, R.
Author_Institution :
Lawrence Livermore Nat. Lab., CA, USA
Abstract :
A cyclotron autoresonant maser (CARM) experiment has been designed and built for operation at 250 GHz, in conjunction with the Lawrence Livermore National Laboratory ARC induction linac. Beam parameters were 2 MeV, 1 kA, and 30 ns. The RF structures tested consisted of 7 mm-diameter 9-18 cm-long Bragg sections. These sections were electroformed, with 50-90 mu m-deep, sinusoidal ripples spaced at half-wavelength intervals. A shallow ripple depth is essential in separating the desired TE/sub 11/ resonance from neighboring resonances that are excited by mode conversion. The authors present code results and validating cold test data that illustrate the sensitivity of mode separation to ripple depth. They also present design calculations and calibration data at 250 GHz for a 2 m-long, microwave diffraction tank.<>
Keywords :
calibration; electromagnetic wave diffraction; electron tube testing; gyrotrons; masers; microwave generation; microwave measurement; 2 MeV; 2 m; 250 GHz; 30 ns; Bragg sections; CARM; LLNL; RF structures; TE/sub 11/ resonance; calibration; cyclotron autoresonant maser; design; microwave diffraction tank; shallow ripple depth; sinusoidal ripples; Calibration; Cyclotrons; Diffraction; Laboratories; Linear particle accelerator; Masers; Radio frequency; Resonance; Tellurium; Testing;
Conference_Titel :
Particle Accelerator Conference, 1991. Accelerator Science and Technology., Conference Record of the 1991 IEEE
Conference_Location :
San Francisco, CA, USA
Print_ISBN :
0-7803-0135-8
DOI :
10.1109/PAC.1991.164433
