Relativistic versus Nonrelativistic Approaches to a Low Perveance High Quality Matched Beam for a High Efficiency Ka-Band Klystron

Advanced technical solution for the design of a low perveance electron gun with a high quality beam dedicated to high power Ka-band klystrons is presented in this paper. The proposed electron gun can be used to feed linear accelerating structures at 36 GHz with an estimated input power of 20 MW, thus achieving an effective accelerating electric field in the (100–150) MV/m range. Additionally, in the framework of the Compact Light XLS project, a short Ka-band accelerating structure providing an integrated voltage of at least 15 MV, has been proposed for bunch-phase linearization. For the klystron, a very small beam dimension is needed and the presented electron gun responds to this requirement. An estimate of the rotational velocity at beam edge indicates that the diamagnetic field due to rotational currents are small compared to the longitudinal volume. A detailed analysis of how this has been achieved, including compression of the beam, rotation in the magnetic field, and analysis of the subsequently generated diamagnetic field has been discussed.

EVALUATION OF SEKOLAH ISLAM TERPADU (SIT) ALIYA BOGOR BUILDING STRUCTURE SYSTEM BASED ON THE REQUIREMENTS OF SNI 2847:2019

<p class="ListParagraph1">Sekolah Islam Terpadu (SIT) Aliya Bogor is located in west Bogor district, Bogor city, West Java, was founded in 200, thus the standards used by planning consultant in building planning using old standard, where these standards have been updated with current standard, namely SNI 2847:2019. The evaluation carried out in this study based on requirements SNI 2847:2019 knowing the outcome of building that was said to be safe used help software ETABS) and SpColumn. Length of building of Umar Bin Khatab A and B are 18,60 meter;23,65 meter.Building area of building Umar Bin Khatab A and B are 541,26 m²; 865,59 m². Concrete quality assessment (fc’) that came from the test of hammer test column elements, beam elements, and plate elements as big 23,74 Mpa;26,59 Mpa;26,59 Mpa. After analysis some of to experience overstrength. The original column dimension In Building of Umar Bin Khatab A was K25x25 with shear reinforcement is Ø16-150 enlarge to K40x40 with shear reinforcement is Ø39-150 and beam dimension 20x40 enlarge to 35x55. On the building of Umar Bin Khatab B was K25x25 with shear reinforcement Ø16-150 enlarge to K40x40 with shear reinforcement Ø25-150, with the original beam dimension 20x40 enlarge to 30x55. The cost budget in the building of Umar Bin Khatab A is Rp 74.158.600,00 and in building of Umar Bin Khatab B is Rp 61.084.600,00.</p>

MODIFIKASI STRUKTUR GEDUNG DENGAN BETON PRACETAK PADA APARTEMEN THE CONEXIO

The Conexio Appartements in actual condition are designed using conventional reinforced concrete method and does not have good quality. While in the project also often afected by the weather. The use of precast concrete are having some excellence of them are not affected by the weather, well maintained quality, and earthquake resistant. The connection between the precast elements play an important role in precast buildings to make the buildings resistant to earthquake. This modification is intended to created earthquake resistant precast building according to SNI 2847:2013 with good quality control. In this study, the building will be modified into 8 floors precast building as planned and reviewed which will be analyzed by ETABS. From the results of the modification according to SNI 1726:2012 and SNI 2847:2013 we obtained, main beam dimension 40x60cm, secondary beam 35x55 cm, column dimension 65x65 cm, overtopping 6 cm for slab and using Splice sleeve grout for column to column connection, lap splices 500mm for beam-column connection, and 30x40cm for concrete consol dimension.Keywords : Precast, Splice Sleeve, Wet Connection.Abstrak Apartemen The Conexio pada kondisi sebenarnya dirancang menggunakan metode konvensional dengan kondisi mutu yang kurang baik. Dalam pelaksanannya, proyek tersebut juga sering terganggu oleh cuaca. Penggunaan beton pracetak memiliki beberapa keunggulan diantaranya pelaksanaannya tidak terpengaruh oleh cuaca, memiliki mutu yang terjaga dan tahan gempa. Sambungan antar elemen pracetak sangat berperan penting dalam bangunan dengan beton pracetak yang tahan gempa sehingga perlu diperhitungkan sesuai dengan peraturan. Modifikasi ini ditujukan untuk menghasilkan gedung dengan pracetak yang tahan gempa sesuai dengan SNI 2847:2013 dengan pengendalian mutu yang baik. Dalam studi ini, gedung tersebut akan dilakukan modifikasi struktur menjadi beton pracetak dengan tinjauan 8 lantai dan analisa dibantu dengan software ETABS. Dari hasil modifikasi yang dilakukan, elemen-elemen pracetak sesuai dengan ketentuan SNI 1726:2012 dan SNI 2847:2013 yaitu meliputi ukuran balok induk 40x60cm, ukuran balok anak 35x55 cm, dengan kolom berdimensi 65x65 cm, tebal overtopping 6 cm pada pelat dan menggunakan Splice sleeve grout pada sambungan kolom, penyambungan balok-kolom dengan panjang penyaluran 500 mm dan penggunaan konsol pada kolom dengan dimensi 30x40cm. Kata kunci : Beton Pracetak, Splice Sleeve, Sambungan Basah.

Evaluasi Perhitungan Dimensi Tulangan Balok Terhadap Analisa Struktur Pada R6 Portal As-32 Proyek Pembangunan Ruko Citraland Bagya City Medan

<p><em>In the planning of multi-storey construction buildings need to pay attention to all aspects that affect the structure of the building and consideration of mature, especially if a multi-story building is designed to withstand earthquakes, the structure considerations will affect the planner in determining alternative planning. Multi-storey building planning needs to pay attention to several criteria, including strength criteria, good structural behavior at the stage of the earthquake plan as well as economical aspects. Discussion topics focused on the comparison of reinforcement plan beam dimension to structural analysis. The purpose of this report is to know and control how the calculation of flexural repetition on the beam structure. For solving this problem a case study is provided that provides theoretical information and analysis. Information in the form of data is processed through computer simulation Program Structure Analysis. Above modeling is made, analyzed to obtain results and discussed for calculation of beam reinforcement dimension ratio. The result of calculation obtained from comparison of reinforcement dimension of portal structure of AS-32 port obtained less amount of reinforcement result of calculation from amount of reinforcement used in field with max comparison value 33%, the difference happened because different assumptions or methods in the calculation analysis.</em></p>

Studying the Linear and Nonlinear Optical Properties by Using Z-Scan Technique for CdS Thin Films Prepared by CBD Technique

CdS films prepared by using CBD technique, linear optical properties tests measured by UV-3000 Nano from OPTIMA, nonlinear properties contained the nonlinear refractive index and nonlinear absorption coefficient by using single light beam source green semiconductor developed laser (SZ- 303 LASER) with material Nd:YVO4+KTP or Aluminum Alloy, and Wavelength Range is (532 nm), Beam Dimension 6 Meter distance Output Laser spot 18 mm ± 2.0 mm.

Comparative Study on the Pseudo Static Testing of Beam Transfer Structure of Frame-Supported Short-Leg Shearwall with and without Haunch

In order to analyse seismic behaviors of the haunched beam-shaped transfer floor, carried out the pseudo static testing, which were subjected to vertical loads and horizontal cyclic loads, respectively on two specimens, including the framed short-leg shear wall haunched beam-shaped transfer plane framework and the same dimension unhaunched beam-shaped transfer frame. The test shows that: 1) Haunched beam-shaped transfer structure can apparently improve the shear-bearing-capacity of the abutment section and reduce the beam dimension effectively, and it is easier to implement the aseismatic design principles, including “strong column and weak beam, strong shearing and weak bend”; 2) if the design is reasonable, haunched beam-shaped transfer structure can get better seismic behavior.

The Effects of the Expander Lens on the Output of the High Energy Nd: Glass Solid-State Laser

The expander lens can match the beam dimension between two cascade amplifiers, so the laser medium can be used effectively and the laser output energy can be improved greatly. Study on the functions of the expander lens in high energy Nd:Glass laser is presented. It is shown that the output energy increases by 30% with the expander lens. The simulation through using the optical software CodeV indicates that adjusting the expander lens can effectively compensate the laser thermal lens, make the focusing beam into the parallel beam, and avoid damaging the optical elements. In addition, adjusting the expander lens may compress the laser beam divergence and focus the laser spot, which is beneficial to form high power density and meet the requirements of laser shock processing.

On Sensitivity of Capacitive Microresonators Near Three Half Natural Frequency

This paper deals with sensitivity of electrostatically actuated micro resonator sensors near three half natural frequency. Mass deposition changes resonance frequencies of structures. Resonator sensitivity, defined as a fraction of change in frequency per unit deposited mass, can be found for microcantilever sensors electrostatically actuated to include fringe and Casimir effects. These actuation forces produce nonlinear parametric oscillations. Constant thickness mass deposition on all four lateral surfaces of the cantilever of rectangular cross-section was assumed. The Euler-Bernoulli theory was used under the assumption that the beams are slender. Mass deposition on the free end surface of the cantilever was neglected. The deposition thickness was considered uniform and very small compared to any beam dimension. The deposited mass had no contribution to the stiffness, only to the mass. Analytical expression of the sensitivity of electrostatically actuated uniform microcantilever resonators sensor near natural frequency can be determined.