Magnet Water Flow Good and Channels Linear: Lab Book 2014_08

Magnet Water Flow Good and Channels Linear: Lab Book 2014_08_20

Summary: Longer spectrum runs were performed on each of the available low energy sources. The channel vs. energy graph was re-plotted based on the new data. The behavior is still linear. The only issue at the moment, is that the signal levels are close to the noise count levels, causing the peaks from each of the sources to be fairly broad. This should be OK. since we're just looking for evidence of a signal at all, resolution won't be critical in this application. The iron magnet cooling supply was completely installed and can supply two gallons per minute to the magnet, meeting the specification. A Cs 137 Dewar attenuation spectrum was started. The data will be collected on the morning of the 21^st.

Bias	1500 V
Gate Window	0.5 uS
Threshold	1.5mV
Attenuation	0 dB
Data set	HBC_00015
Source	Cs 137 Taped to window
Start Time	8:53 AM
Stop Time	11:58 AM
Date	2014_08_20
x-y scope V/div	1, 0.5
Shielded?	Yes
Tube	Harshaw B-

Bias	1500 V
Gate Window	0.5 uS
Threshold	1.5mV
Attenuation	0 dB
Data set	HBC_00016
Source	Cd 109 Taped to window
Start Time	12:15 PM
Stop Time	1:38 PM
Date	2014_08_20
x-y scope V/div	1, 0.5
Shielded?	Yes
Tube	Harshaw B-

Bias	1500 V
Gate Window	0.5 uS
Threshold	1.5mV
Attenuation	0 dB
Data set	HBC_00017
Source	Am 241 Taped to window
Start Time	2:01 PM
Stop Time	6:41 PM
Date	2014_08_20
x-y scope V/div	1, 0.5
Shielded?	Yes
Tube	Harshaw B-

Channel Linearity

Source	Peak Channel	Energy eV
Cd109	59	22100
am241	95	26344
Cs 137	108	32000
Am241	271	59541
Cd109	421	88000
	1023	197523.88

Magnet Cooling

To cool the magnet properly, a water flow of two gallons per minute is required. That corresponds to 3.785 liters every 30 seconds. 3.75+ liters was measured into a bucket, and a piece of tape was placed with its lower edge at the water level. Flow speed trials were run by watching the water level compared to the tape in 30 second intervals. The required flow rate was achieved after several incremental water flow increases at the sink. The flow can be measured at the sink, but as a ball park indictor, the “CW” indicator should be readable from left to right and perched at about 30 degrees to the horizontal.

There were initially leaks at the right most input manifold and at the garden hose output manifold. There is still a leak at the sink fitting. A weight has been placed on top of the hose to hold it in the sink so the leak flows down the drain rather than down the cabinet.

Signal Attenuation Due to Dewar

The material that makes up the liquid helium Dewar will attenuate the signal form the experiment. The level of attenuation is being measured by collecting count data on each of the sources inside and outside the Dewar. The setup for the Dewar attenuation runs is shown below. The source was lowered into the sample chamber of the Dewar on the end of a wooden yard stick It was taped in place with a thin layer of paper, (to protect the source from the tape), and two layers of electrical tape. The yard stick was roughly centered in the chamber with two rolls of masking tape as shown below.

More Cowbell! Record Production using Google Forms and Charts

First, the what : This article shows how to embed a new Google Form into any web page. To demonstrate ths, a chart and form that allow blog readers to control the recording levels of each instrument in Blue Oyster Cult's "(Don't Fear) The Reaper" is used. HTML code from the Google version of the form included on this page is shown and the parts that need to be modified are highlighted. Next, the why : Google recently released an e-mail form feature that allows users of Google Documents to create an e-mail a form that automatically places each user's input into an associated spreadsheet. As it turns out, with a little bit of work, the forms that are created by Google Docs can be embedded into any web page. Now, The Goods: Click on the instrument you want turned up, click the submit button and then refresh the page. Through the magic of Google Forms as soon as you click on submit and refresh this web page, the data chart will update immediately. Turn up the:

Cool Math Tricks: Deriving the Divergence, (Del or Nabla) into New (Cylindrical) Coordinate Systems

Now available as a Kindle ebook for 99 cents ! Get a spiffy ebook, and fund more physics The following is a pretty lengthy procedure, but converting the divergence, (nabla, del) operator between coordinate systems comes up pretty often. While there are tables for converting between common coordinate systems , there seem to be fewer explanations of the procedure for deriving the conversion, so here goes! What do we actually want? To convert the Cartesian nabla to the nabla for another coordinate system, say… cylindrical coordinates. What we’ll need: 1. The Cartesian Nabla: 2. A set of equations relating the Cartesian coordinates to cylindrical coordinates: 3. A set of equations relating the Cartesian basis vectors to the basis vectors of the new coordinate system: How to do it: Use the chain rule for differentiation to convert the derivatives with respect to the Cartesian variables to derivatives with respect to the cylindrical variables. The chain

The Valentine's Day Magnetic Monopole

There's an assymetry to the form of the two Maxwell's equations shown in picture 1. While the divergence of the electric field is proportional to the electric charge density at a given point, the divergence of the magnetic field is equal to zero. This is typically explained in the following way. While we know that electrons, the fundamental electric charge carriers exist, evidence seems to indicate that magnetic monopoles, the particles that would carry magnetic 'charge', either don't exist, or, the energies required to create them are so high that they are exceedingly rare. That doesn't stop us from looking for them though! Keeping with the theme of Fairbank[1] and his academic progeny over the semester break, today's post is about the discovery of a magnetic monopole candidate event by one of the Fairbank's graduate students, Blas Cabrera[2]. Cabrera was utilizing a loop type of magnetic monopole detector. Its operation is in concept very sim

Copasetic Flow

Search This Blog