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by: Anahi Sawayn


Anahi Sawayn
GPA 3.86


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Class Notes
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This 4 page Class Notes was uploaded by Anahi Sawayn on Saturday September 12, 2015. The Class Notes belongs to CrmLaw 109 at University of California - Irvine taught by Staff in Fall. Since its upload, it has received 35 views. For similar materials see /class/201846/crmlaw-109-university-of-california-irvine in Criminology, Law And Society at University of California - Irvine.

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Date Created: 09/12/15
MECO WBS15 Muon Beamline Semester Report Meco Note 109 July 21 2003 Bill Morsel Dick Hseuhl Dave Phillipsl Vladimir Tumakovz Rashid Djilkibaevfquot4 Peter Yaminl Peter Nemethy3 Dan Weissl Bill Leonhardtl and John Kane5 BNLl Univ of California Irvine2 New York University3 INR4 College of William and Mary5 151 Vacuum Dan Weiss Dick Hseuh Bill Morse The main issue for the PS vacuum was oxidation of the radiation cooled target A water cooled target is now being studied UCI will develop a PS vacuum spec The PS and DS vacuum spaces are separated by the antiproton stopping window see WBS 156 Dan Weiss gave an excellent presentation of the DS vacuum issues at the June 2 2003 MECO collaboration meeting The 10K grant from UCI for BNL vacuum work has now been spent mostly on WBS156 Work on WBS 151 will resume when money is available 152 Collimators Dave Phillips Physics optimization by V Tumakov has continued during the last semester see MECO Note 100 v2 April 28 2003 Physicsengineering optimization awaits funding 153 Muon stopping target Bill Morse Physics optimization by V Tumakov has continued during the last semester see MECO Note 100 v2 A question came up at the BNL Experimental Safety Review on June 3 2003 about the muon stopping target and antiproton stopping window temperature when the beam is on The radiation equilibrium temperature is solved for using the equation 0747 4 P where P is the power deposited by the beam we assume emissivity 8m 04 and the area A is taken as the area of the rst and last disks as the intermediary disks radiate largely to each other not to the surrounding room temperature material The power is calculated from the dEdx of the electrons in the beam 0187e 4gtlt1013p 44MeV16gtlt10 19C p S 639 cm 8 P 04cm 2W where the rate of electrons dominates other species and is taken from MECO Note 100 1 4 AT i 216 C 014 A complete calculation will be done during the engineeringphysics optimization including the heat ow due to conduction through the target supports 154 Detector shield protons Bill Morse A WBS 1547 safety issue came up at the BNL Safety Committee Review combustion hazard We plan to address this issue during the Physicsengineering optimization Physicsengineering optimization awaits funding 155 Muon beam stop Vladimir Tumakov Physics optimization has continued during the last semester see MECO Note 100 v2 April 28 2003 Physicsengineering optimization awaits funding 156 Antiproton stopping window Dan Weiss Dick Hseuh Bill Morse Dave Phillips We submitted a proposal to UCI for 10K for the preliminary design of the antiproton stopping window during the previous semester which was approved by BNL DOE NSF and UCI The work was completed during this semester The report is available at httpmecopsuciedurefidesignrefidesignhtml A question was asked at the BNL Experimental Safety Review of what the accumulated dose would be after one year runn1ng 0187e39 4gtlt1013p 107s 26MeV cm3 1 g Gy Kapton degrades at a dose ofbetween 2gtlt107 and 2gtlt108 Gy so it would be prudent to change the window after the first run and test it The temperature rise of the antiproton stopping window with the beam on will be less than the temperature rise of the muon stopping target since the total thickness is much less and the surface area available for radiation to room temperature surroundings is relatively larger A complete calculation will be done during the engineeringphysics optimization including the heat ow due to conduction 157 Neutron absorbers Peter Yamin We have identified a potential supplier Thermo Electron Corp of boron and lithiumdoped polyethelene which can be used as thermal neutron shields We will determine whether the outgassing properties of these materials make them suitable for inclusion in the Detector Solenoid vacuum 158 Detector support structure Peter Nemethy In the past 6months we have continued engineering studies with Bill Leonhardt on a low duty cycle part time basis on MECO detector installation related issues We developed a full list of interface items between the DS solenoid and detector hardware and an associated drawing We examined in detail the downstream end of the vacuum volume concentrating on the vacuum bulkhead which is decoupled from the beamstop just upstream of it The bulkhead closes the vacuum volume with a load of 29 Tons on it and also serves the vacuum pumping ports and all vacuum feedthroughs signal hv gas refrigeration and monitoring We developed variations of the feedthrough design with gures and tables of maximum vacuum port and feedthrough capacity by type that could be served The plan for the next period is to continue the parttime engineering studies 39 on the 39 39 and r 39 iou of the entire downstream end 159 Target monitoring John Kane Developments for the Target Monitoring system since the previous Semester Report of Dec 2002 can be summarized by describing alternate approaches to the design of a stopping muon experiment now being planned for TRIUMF In this proposed run the objective is to collect the energy spectra for prompt muonic x rays emitted in the formation of GS muonic atoms as well as separate energy spectra for charged particles protons amp deuterons and neutrons released during the muon capture process The stopping targets would consist of thin foils of aluminum and titanium that match those considered for the MECO detector solenoid In addition we plan to use silicon as a third thin foil target Given the high quality of earlier charged particle data for muons stopping in a Si detector this target could serve as a reference calibration of charged particle emission in our experimental setup ALTERNATE APPROACHES TO PROTON SPECTROSCOPY l PSD Si photodiodes As described in the previous semester report four ofthese in the form of strip Si photodiodes are available from Houston These can be arranged to give two X Y hits that track charged capture products from the target foil ADCs on each photodiode can sequentially give dE losses for penetrating charged particles A proton of 15 MeV will then range out in the thickness of the four Si planes Higher energy protons exiting the Si stack continue on for 05 meters to large thick scintillators which soak up the residual energy 2 Magnetic Spectrometer TRIUMF has been asked to provide detailed information on available magnets The attached layout shows a magnet of 05 meter depth which has X Y straw planes before amp after the magnet A special single Si PSD positioned next to the target records both X Y and dE before a charged capture product enters the spectrometer This assures 3point tracking Calculations have been made to see what it will take to measure the momentum spectrum in this manner At a eld strength of 02 T and a eld depth of 05 meters a proton which exits the PSD with 10 MeV will de ect by 553 cm between SDCl and SDC 2 Protons exiting the PSD with 90 and 100 MeV will be de ected by 179 and 169 cm respectively For this spectrometer con guration a tracking resolution of 200 microns should be suf cient to produce a proton spectrum up to 100 MeV For a deuteron exiting the PSD with 10 MeV the de ection is 389 cm The case for a magnetic spectrometer will depend upon the availability of an appropriate magnet and a drift chamber system The latter is not available at TRIUMF so this system would have to be developed within the collaboration


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