Copasetic Flow

Summary:   Most of the morning was spent hooking up the last few wires on the iron magnet, and figuring out which section of EM I’ll be TA’ing for.  In the afternoon, the pulsed current supply for the fast magnet was fired while taking background spectral data with the NaI detector.  There was no recognizable effect caused by firing the pulser. If you're new to the experiment, please scroll to the bottom for background information. Magnet Work Spades were attached to the four wires of the three phase power cord.  These were in turn attached to the magnet power supply.  The power supply case was grounded per the instructions The chiller was turned on along with the coil cooling supply, (the sink faucet).  The flow of the coil cooling supply was increased until the bucket/timer flow meter indicated two gallons per minute.  The position of the cold water know with a flow of two gallons per minute is shown below. ...

Summary :  It was a somewhat uneventful day.  Current carrying cables to connect the power supply and the iron yoke magnet were constructed.  A detector longer run was made with the Cd 109 source, but the peak resolution did not improve. If you're new to the experiment, scroll to the bottom for background. Six gauge quarter inch copper crimp lugs were attached to the ends of two lengths of cable.  These cables will transmit current from the power supply to the magnet. To Do: Add terminal lugs for power cord.  Wire chassis to ground. Detector Work A longer counting run was made using the Cd 109 source.  The results will be entered in tomorrow’s lab book.  There was not a significant improvement in peak resolution. Bias 1500 V Gate Window 0.5 uS Threshold 1.5mV Attenuation 0 dB Data set HBC_00021 Source Cd 109 in Dewa...

I’m working on attaching the cooling hoses to the iron yoke magnet today.  I attached the outlet hoses and ran a quick test to make sure that I did indeed have the outlet hose connections.  I attached a water bottle on a hose to the open connection pointed at in the picture below and forced water through.  The water exited at the labeled water out connection.  The exit connection will ultimately have a green hose on it like the manifold on the left.  Do not confuse this with the red hose the arrow appears to be pointing at in this picture.  This means that the water flow is indeed from the upper hoses to the lower hoses on each set of coils, and not across from the left to the right connections on either the top or the bottom. Note to readers:  When the tone of the text wavers into the bossy and possibly semantic, or obvious, these are notes for myself in a few weeks when I don't remember what's going on anymore.

OK, so that was quite the title.  I haven't done one of these in a while, but classes are about to start again and i figured I may as well get started deriving things again.  Plus, I had to do it for the can crusher magnet simulation code [1] for the experiment [3].  Here's what's really going on.  I have a Sage function that will give me the magnetic field in the z direction produced by a coil of wire that sits at z = 0 and a has a radius of 'rcoil'.  I'd like to know the magnetic field produced by the loop of wire along a circular path that is perpendicular to the plane of the current carrying coil.  A circular path perpendicular to the plane of a coil kind of begs for spherical coordinates, but the routine I have takes a z coordinate and a radius coordinate in the cylindrical coordinate system.  In the picture above, the circular path is shown, and the coil of wire is at the diameter of the circle and perpendicular to the page.  Note:  ...

Scroll to the bottom for background on the experiment. Checked that the pole faces of the yoke magnet retract fully leaving enough room for the glass Dewar.  The poles do retract far enough, but there is a trick to it.  The rotator that advances and retracts the pole piece should have two metal collars associated with it.  On the side I initially tried to adjust, one of the collars was missing and the pole would not move.  When I moved the second collar to that side of the magnet, the pole piece moved after applying a little bit of force Here's how it works  The collar the handle protudes from is threaded on the inside.  It turns on the threads that are visible and are attached to the pole piece.  If the second collar is in place, then the torque created by the handle is applied to the threads of the pole piece and it slides back and forth through the treads of the handled piece along a small rail at the bottom of the threaded pole.  A...

Summary Prep work for magnet power supply testing was done today.  A three phase switch box was wired along with an extension cord to reach from the switch box to the power supply.  The input side of the water chilling system was constructed complete with a flow meter.  Only the output side setup remains. Background Hirsch's theory of hole superconductivity proposes a new BCS-compatible model of Cooper pair formation when superconducting materials phase transition from their normal to their superconducting state[1].  One of the experimentally verifiable predictions of his theory is that when a superconductor rapidly transitions, (quenches), back to its normal state, it will emit x-rays, (colloquially referred to here as H-rays because it's Hirsch's theory). A superconductor can be rapidly transitioned back to its normal state by placing it in a strong magnetic field.  The experiment being performed proposes to look for H-rays emitted by a Pb superconduc...