JB Undergraduate Research Progress

This page gives an overview of the work I have done under the supervision of Dr. Richard Jones from May 2013 to the present time.

Finalizing summer work
I worked in the lab as a student worker during the summer of 2013. I recorded my day to day work in a summer log book. I spent my time working on a [[Media:JBCooling_system1.pdf|proposal for a chilled water line for the servers in P403.]] I finalized this document in the beginning of the Fall 2013 semester.

Familiarizing myself with the active collimator
When I first gained access to the active collimator, I took it apart in order to understand its structure. I took pictures of its interior upon disassembly.

I read [[Media:senderovichthesis.pdf|Igor Senderovich's PhD thesis]] very carefully in order to understand the active collimator's purpose and how it works. This project is largely based on Senderovich's work from his time under Dr. Jones's supervision. The active collimator has been [[Media:jbqualityassurance.pdf|quality assured]] by Alex Barnes, James McIntyre, and Dr. Jones. A [[Media:jbapsdnp.ppt|detailed PowerPoint]] regarding the use of the active collimator in the GlueX experiment was written by Dr. Jones, Igor Senderovich, and Ann Marie Carroll for an APS/DNP meeting in October of 2012.

Data Acquisition
My research thus far has been focused on examining the electronic properties of the active collimator. I spent a few weeks working on capturing waveforms with a [[Media:jbtdsmanual.pdf|Tektronix TDS 2024 Digital Storage Oscilloscope]] by tapping the pin cushions with a piece of metal that I was holding in order to build up a charge on the cushion. I connected each of the tungsten pin cushions within the active collimator to cables with an RF coaxial adapter input which was connected to the face plate and a BNC output which was connected to a [[Media:JbAmplifier.pdf|PMT-5R amplifier]]. I used a [[Media:JbPowersupply.pdf|F-100PS 15 Volt DC Power Supply]] to power the amplifiers. However, I did not have control over the amplifier's gain setting with this setup.

Igor developed a data acquisition LabView program for the active collimator. The program allows the user to vary the gain setting on the amplifiers from 10^6 to 10^12 in powers of ten, record the potential difference across each of the tungsten pin cushions at a frequency of about 83 kHz, and calculate Fourier transforms on the received signals. The program is run on a PC that Alex Barnes and I built which contains a data acquisition card. The active collimator station was positioned in P403 until January 3rd, 2014.

Trip to JLab
I traveled to Jefferson Lab in Newport News, Virginia from January 4th to January 15th during my 2014 winter break. I took the active collimator station with me. I recorded a day to day log (search "JLab trip"). I have also created a travel expenses spreadsheet and an inventory spreadsheet.

Tour of Hall D
On January 10th, Sascha Somov took me to the accelerator site for a tour of the Hall D facility. Below are some pictures I took during the tour. Note that the pictures follow the direction of the photon beamline; each successive picture is downstream from the previous picture. The tour started with the "Collimator Cave", which is the future home of the active collimator. We then toured the Hall D main room. Inside were the Barrel Calorimeter (BCAL) and Forward Calorimeter (FCAL) which will be used in identifying the resultant particles from the interaction of the photon beam with the liquid hydrogen target.

Relocation of the Active Collimator Station
The actcol-station is set up in F117 of the CEBAF building at Jefferson Lab. I have created a wiki page that teaches a user how to operate the station.

Data Analysis
I have been using the C++ based program ROOT in order to analyze the data obtained from the active collimator. I will post graphs, fits, and Fourier transforms once I refine the data taken from the collimator.