my work on atrap, part ii

My work on ATRAP, Part IIMy work on ATRAP, Part II

Steven MosesSteven MosesJuly 23, 2009July 23, 2009

University of Michigan-CERN REUUniversity of Michigan-CERN REUProf. G. Gabrielse and Dr. J. WrubelProf. G. Gabrielse and Dr. J. Wrubel

LabVIEW ProgramsLabVIEW Programs

Have developed a VI to control the Have developed a VI to control the operation of an excimer laser used operation of an excimer laser used for producing photoelectrons.for producing photoelectrons.

Currently testing this VI and Currently testing this VI and comparing its performance with the comparing its performance with the software from the manufacturer.software from the manufacturer.

Once this is done, this VI will be used Once this is done, this VI will be used in place of the original inefficient in place of the original inefficient software.software.

Antiproton beam pathAntiproton beam path

Trap

Degrader

From AD

PPAC and Energy tuning cell

Bending magnets

PPAC – Parallel Plate Avalanche Counter

Calibrating Charge CountersCalibrating Charge Counters

Electrons or positrons are deposited Electrons or positrons are deposited on the degrader. on the degrader.

Want to calculate the effective Want to calculate the effective capacitance of the charge counter.capacitance of the charge counter.

Pulse generator

A250 Charge Sensitive Preamp

Oscilloscope

During calibration, the charge is simulated by converting the pulse from a pulse generator into charge.

100 pF

50 Ω

Studying pbar normalizationsStudying pbar normalizations 3 ways to determine the number of antiprotons 3 ways to determine the number of antiprotons

per cycle: nexp, PPAC sum, and AD number.per cycle: nexp, PPAC sum, and AD number.

It seems as though the ppac shows a good linear relationship to the AD number, while nexp is dependent on experimental conditions.

Other projectsOther projects Building a wagon Building a wagon

for a vacuum for a vacuum pump.pump.

Fixing a liquid Fixing a liquid helium dewar helium dewar level meter.level meter.

Creating Creating electrical controls electrical controls for gate valves.for gate valves.

Questions?