Wake potentials and impedances of charged beams in gradually tapering structures

Long - Range Wake Potentials in Disk - Loaded - Accelerating Structures

To achieve a reasonable efficiency for the conversion of RF power to beam power, and consequently, to attain a higher luminosity, most designs for future high energy linear colliders require the acceleration of ten or so .bunches per RF pulse. In such bunch trains, however, the long-range longi. tudinal wake potential produces a cumulative energy deviation from the first to the last bunch, whil...

diagnostic and developmental potentials of dynamic assessment for writing skill

این پایان نامه بدنبال بررسی کاربرد ارزیابی مستمر در یک محیط یادگیری زبان دوم از طریق طرح چهار سوال تحقیق زیر بود: (1) درک توانایی های فراگیران زمانیکه که از طریق برآورد عملکرد مستقل آنها امکان پذیر نباشد اما در طول جلسات ارزیابی مستمر مشخص شوند; (2) امکان تقویت توانایی های فراگیران از طریق ارزیابی مستمر; (3) سودمندی ارزیابی مستمر در هدایت آموزش فردی به سمتی که به منطقه ی تقریبی رشد افراد حساس ا...

Broadband Impedances of Accelerating Structures: Perturbation Theory*

A perturbation theory for broadband impedance cdcuhtianr ha been developed, allowing evdu&on of impedanas fur au 4bccelera* rtructure of a rather arbitmuy shape. Generd fomulas are given for the longitudind aud transveme impedarum. The method is &e&A by cdchtingimpedan~andcompkng resulta with thoee for l ~~cturea previously studied. Severd new vaults, includLy impedance of a taper, ur presented.

Introduction to Wakefields and Wake Potentials

Production of negatively charged radioactive ion beams

Beams of short-lived radioactive nuclei are needed for frontier experimental research in nuclear structure, reactions, and astrophysics. Negatively charged radioactive ion beams have unique advantages and allow for the use of a tandem accelerator for post-acceleration, which can provide the highest beamquality and continuously variable energies. Negative ion beams can be obtainedwith high inten...