Mechanical design and analysis of a low beta squeezed half-wave resonator

Abstract

A superconducting half-wave resonator (HWR) of frequency=162.5 MHz and β=0.09 has been developed at Institute of Modern Physics. Mechanical stability of the low beta HWR cavity is a big challenge in cavity design and optimization. The mechanical deformations of a radio frequency superconducting cavity could be a source of instability, both in continues wave(CW) operation or in pulsed mode. Generally, the lower beta cavities have stronger Lorentz force detuning than that of the higher beta cavities. In this paper, a basic design consideration in the stiffening structure for the detuning effect caused by helium pressure and Lorentz force has been presented. The mechanical modal analysis has been investigated with finite element method(FEM). Based on these considerations, a new stiffening structure has been promoted for the HWR cavity. The computation results concerning the frequency shift show that the low beta HWR cavity with new stiffening structure has low frequency sensitivity coefficient, Lorentz force detuning coefficient K L and stable mechanical property.

Treatment of Integrated Steel Plant Wastewater Using Conventional and Advanced Techniques

“…The inclusion of both homogenous and heterogeneous catalysts for the decomposition of ozone is well received by the research community. [ 128 ] Metal oxides such as NiO, [ 129 ] composites such as Mn x Ce 1‐x O 2 /γ‐Al 2 O 3 , [ 130 ] ZnFe 2 O 4 , [ 131 ] and natural sepiolite supported CuFe 2 O 4 , [ 132 ] have proved to be efficient for biotreated coking wastewater.…”

In C Language How to Use Pointer to Access Two-Dimensional Array Element

“…In c, a two-dimensional array is really a onedimensional array, each of whose elements is a onedimensional array. For example, two-dimensional array a has three elements a[0] 、 a[1] 、 a [2], from the knowledge of one-dimensional array we know that a and &a[0] are equivalent, a+1 and &a [1] are equivalent, a+2 and &a [2] are equivalent.…”

“…A+i and &a[i] are starting address of each row in the array, they are called row address. [2] Each element of array a is a one-dimensional array, such as a In summary, the address of two-dimensional array is divided into row address and element address two categories.…”

In C Language How to Use Pointer to Access Two-Dimensional Array Element

“…A two-dimensional array is defined as follows: [1] int a [3][4]; A. the Address of Two-dimensional Array In c, a two-dimensional array is really a one-dimensional array, each of whose elements is a onedimensional array. For example, two-dimensional array a has three elements a[0], a [1], a [2], from the knowledge of one-dimensional array we know that a and &a[0] are equivalent, a+1 and &a [1] are equivalent, a+2 and &a [2] are equivalent.…”

“…A+i and &a[i] are starting address of each row in the array, they are called row address. [2] Each element of array a is a one-dimensional array, such as a[0] [4], a [1][4], a [2][4], wherein a[0], a [1], a [2] can be regarded as the name of the one-dimensional array. Therefore ,a[0] and &a[0][0] are equivalent, a[0]+1 and &a[0] [1] are equivalent, a[0]+2 and &a[0] [2] are equivalent, a[0]+3 and &a[0] [3] are equivalent.…”