Solenoid

About: Solenoid is a research topic. Over the lifetime, 19278 publications have been published within this topic receiving 114721 citations.

Dual clutch transmission having area controlled clutch cooling circuit

Abstract: A dual clutch transmission having a hydraulic circuit for controlling and cooling the clutches of a dual clutch transmission having lube valves in fluid communication with a source of pressurized fluid and wherein the cooling flow is controlled by a solenoid which is adapted to move a valve member to produce a flow area through the valve that is an inverse function of the current delivered to the solenoid and so as to deliver a predetermined control solenoid pressure ultimately to each of the clutches of a dual dutch transmission.

Four-way solenoid selector valve

Abstract: A four-way solenoid selector valve comprising a valve spool slidable in a housing bore; input, outlet and return ports communicating therewith; a chamber piston mounted on the one end of the spool, subject to fluid pressure changes on its faces to cause its axial translation in either direction; and restrictive orifices disposed in passageways communicating with the piston chamber. Solenoid actuated poppet valves close and open such passageways to the return port while ducts which communicate with the input port are connected to the poppet valves. Energization of a solenoid of one or the other of such valves provides uncovering of corresponding metering slots for the two outlet ports as a result of translation of the valve spool. The corresponding restrictive orifice controls or programs the rate of flow from the piston chamber so as to effect a relatively slow time span desired in opening or uncovering such metering slots. A spring system mounted at the other end of the spool, in a cavity, is provided to return the selector valve to its neutral state upon de-energization of the solenoid.

Relaxation of Trapped High Magnetic Field in 100 m-long Class $rm MgB_2$ Solenoid Coil in Persistent Current Mode Operation

Abstract: This paper reports on the relaxation of trapped magnetic field in a MgB2 solenoid coil in PC mode operation. For PC mode operation, we fabricated a closed loop circuit with a MgB2 coil, a PCS and some superconducting joints. The MgB2 coil was fabricated employing a 100 m-long PIT processed MgB2 wire using a wind & react method. The critical current Ic of the coil reached 166 A and the coil was able to generate a maximum magnetic field of about 2.5 T at 4.2 K without an external field. The PCS was fabricated employing a long NbTi wire stabilized Cu-Ni alloy. The joints were fabricated between MgB2 and NbTi conductor, between NbTi (PCS) and NbTi conductor. The resistance of all fabricated joints was estimated to be less than 1.0times10-13 Omega. In PC mode operation with the closed loop circuit, a magnetic field of 1.46 T was trapped for about 50000 s (above 12 hr.) without any detectable decay. These results demonstrate the possible use of the MgB 2 superconductor for applications such as MRI superconducting magnet

The MERIT High-Power Target Experiment at the CERN PS.

Abstract: The MERIT experiment was designed as a proof-of-principle test of a target system based on a free mercury jet inside a 15-T solenoid that is capable of sustaining proton beam powers of up to 4 MW. The experiment was run at CERN in the fall of 2007. We describe the results of the tests and their implications. Plans are being discussed for possible future machines which can deliver proton beams with multi-MW beam powers. A prominent application for these powerful beams will be to produce intense secondary beams suitable for investigating important physics issues. Examples include investigations of rare decay processes and neutrino oscillations. The Neutrino Factory and Muon Collider Collaboration [1] has proposed a target system [2, 3] which will be capable of supporting proton beam powers of 4 MW with the purpose of producing and collecting intense muon beams for eventual use in storage rings. The core of this proposed target system consists of a high-Z, free-flowing liquid mercury jet which intercepts the proton beam within the confines of a high-field (15-20 T) solenoid. An important attribute of this system is that the liquid jet target can be replaced for subsequent proton pulses. The experiment described in this paper was designed to provide a proof-of-principle demonstration of this concept. Preparations for this experiment have been previously reported [4].