[en] This report provides results of longitudinal and transverse impedance measurements of the Low Energy Booster (LEB) Extraction Kicker Magnet of the Superconducting Super Collider (SSC). The kicker magnet was designed to steer the beam upon extraction from the LEB into the septum magnets, requiring a vertical angular deflection of 1.5 mrad. This magnet would have been required to generate an integrated field of 0.06 T-m for 2 μs, rising from 1% to 99% of peak in ≤ 80 ns

[en] The collider ring for the Superconducting Super Collider (SSC) requires 6000 bellows to connect magnets and allow movement due to contraction of the magnets during cooling. Bellows have unacceptably high impedances in the collider ring and must be shielded. The original impedance budget (which was based on an older design) for 6000 rf joints was estimated at Z/n = 0.12 ohm for the longitudinal and Zt = 10 Mohn/m for the transverse impedance. With the new design it was hoped to lower these numbers to Z/n = 0 .075 ohm and Zt = 2.8 Mohm/m

[en] Short communication

[en] We report the results of measurements using the wire method and numerical simulations using the code HFSS (High-Frequency Structure Simulator) of the beam coupling impedance of the proposed liner for the collider ring of the SSC. We compare the results of the measurements and simulations to analytical estimates by R. Gluckstern and S. Kurennoy, and conclude that the additional coupling impedance introduced by a liner with pumping holes can be acceptable

[en] Eddy currents are developed in the tuner of the Superconducting Super Collider Low Energy Booster (LEB) cavity during the LEB frequency sweep. The two main difficulties created by the eddy currents are excessive tuner-surface heating, and more important, a reduction in the time response of the tuner. We present a detailed analysis of the eddy currents for various tuner designs. The analysis has been done using 2D and 3D time-domain finite element codes (PE2D by Vector-Field and EMAS by MSC). Non-linear analysis was performed utilizing B-H curves. The codes have been benchmarked analytically and by using measured data for different slotted pillbox structures

[en] This report describes a ferrite tuner design for the LEB cavity that utilizes techniques for bonding ferrite to metallic cooling plates that is utilized in the high-power rf and microwave industry. A test tuner was designed to fit into the existing LEB-built magnet and onto the Grimm LEB Cavity. It will require a new vacuum window in order to attain maximal tuning range and high voltage capability and a new center conductor of longer length and a different vacuum window connection than the Grimm center conductor. However, the new center conductor will be essentially identical to the Grimm center conductor in its basic construction and in the way it connects to the stand for support. The tuner is mechanically very similar to high-power stacked circulators built by ANT of Germany and was designed according to ANT's established engineering and design criteria and SSC LEB tuning and power requirements. The tuner design incorporates thin tiles of ferrite glued using a high-radiation-resistance epoxy to copper-plated stainless steel cooling plates of thickness 6.5 mm with water cooling channels inside the plates. The cooling plates constitute 16 pie-shaped segments arranged in a disk. They are electrically isolated from each other to suppress eddy currents. Five of these disks are arranged in parallel with high-pressure rf contacts between the plates at the outer radius. The end walls are slotted copper-plated stainless steel of thickness 3 mm

[en] This paper reports results of using High-Frequency Structure Simulator (HFSS) to design a Smythe-type broadband longitudinal HOM damper for the SSCL low energy booster (LEB) ferrite-tuned cavity. The damper is designed to have a shunt impedance varying from less than 1 kohm between 100--200 MHz to about 3 kohm at 1 GHz. Above 1 GHz, the ferrite should effectively damp all HOM

[en] This paper reports results of using High-Frequency Structure Simulator (HFSS) to design a Smythe-type broadband longitudinal HOM damper for the SSCL low energy booster (LEB) ferrite-tuned cavity. The code is also used to check the effect of arranging resistive loads in an azimuthally assymetric pattern to damp transverse modes

[en] An Advanced Hadron Facility (AHF) requires a beam pipe with low eddy-current losses and a low beam-coupling impedance. The requirements cannot be met with a solid, conducting beam pipe but may be met by a ceramic pipe with conducting layers, which may have a higher coupling impedance. They have measured and compared the transmission-line impedances for several candidate pipe segments. The results are correlated with the beam-coupling impedance and are compared with calculated values and with AHF requirements

[en] A holed liner was considered for the Superconducting Super Collider (SSC) Collider Ring because of vacuum problems caused by photon-induced desorption. The liner would serve to shield the cold surface of the beam tube from the synchrotron radiation and the holes (or slots) would allow distributed pumping by gas-absorption material that could be placed between the liner and the beam tube. The impedance of holes and slots in a liner were studied by means of simulations using both MAFIA and HFSS, analytical modelling, wire measurements and electron beam measurements