<br><br>---------- Forwarded message ----------<br>From: <b>Susan Brown</b> <br>Date: Tuesday, December 17, 2013<br>Subject: PAC 41 Meeting Preparation - E12-13-011<br>To: Karl Slifer <<a href="mailto:karl.slifer@unh.edu">karl.slifer@unh.edu</a>><br>
<br><br> Since 2006, the Jefferson Lab Program Advisory Committee has held 10 meetings to accept experiment proposals for the 12 GeV era following the upgrade of CEBAF. As a result, we now have 59 high quality proposals with 3821 PAC days approved for running in the future. This backlog represents 7-10 years of operation of CEBAF, depending on the level of operational support and degree of parallel running in the experimental halls. This clearly indicates the tremendous interest in the user community for the capabilities of the upgraded facilities at Jefferson Lab, and we are delighted that the user community has been so responsive to our calls for proposals. However, the Laboratory has been repeatedly advised to develop a plan to manage this backlog, with the expectation that additional proposals will be forthcoming in future PAC meetings.<br>
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We have held discussions at the last 2 PAC meetings on this issue, and have agreed with the PAC that a special meeting of the PAC should be devoted to consideration of the priority for scheduling the already approved set of experiments. We have decided to schedule a special PAC meeting, PAC41, dedicated to this process.<br>
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PAC41 will discuss the priority of already approved proposals for scheduling during the first 3-5 years of production running (beyond commissioning) in the 12 GeV era of CEBAF. The goal of this meeting is to provide input to the Lab scheduling process from the PAC in order to realize the highest impact program early in the 12 GeV running period. What factors beyond scientific rating could be folded in to determine high impact can be read from the PAC chair comments of the PAC39 and PAC40 reports. PAC41 will not do scheduling, but can provide the lab valuable input.<br>
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Prior to the meeting, the Associate Director for Experimental Nuclear Physics, the Deputy Associate Director for Experimental Nuclear Physics, and the 4 Hall Leaders will select approved proposals that are expected to be ready for production running during the period 2015-2020. Approved proposals that require additional equipment that will not complete construction, installation and commissioning before 2020 will not be considered. It is for this that we seek your help. Please find attached a document (for Hall B experiments, there are sometimes two documents to reflect that experiments may have components that cannot be run in a single experiment or run group) filled-in by the Hall Leaders where we attempt to summarize equipment and beam requirements, concerns or equipment conflicts, and specific experiment requirements. Please realize that this is on purpose coarse information, it does not matter too much which exact year equipment or specific beam properties are anticipated to be achieved, as this also depends on priority, what is relevant is what experiments could be ready for physics data taking, beyond commissioning, before 2020. In the end, we will use this information to provide the PAC with one large matrix on rough “year-ready” of experiments, further outlining run groups and/or potential conflicts.<br>
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We request that you work with the Hall Leaders to converge on a final document that roughly outlines what we need, and submit this to us BEFORE close of business January 13, 2014.<br>
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PAC41 will then consider all approved proposals in each of the six physics categories (see appendix) ready to take physics data in the 2015-2020 period (taking into account the earlier presented commissioning and “year-one” physics plans in each Hall), and discuss the relative priority of the proposals in each category. The PAC will identify a subset of these proposals that it considers to be “Highest Priority” for scheduling during this time frame.<br>
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Please note that we do neither intend that these designated proposals will be the only ones available for scheduling before 2020, nor that they will saturate the beam time available in any experimental hall prior to 2020, but expect to include the PAC41 input as part of the usual scheduling process. The present status (grades and approved running time) of all previously approved proposals will not be changed by this procedure. It is not anticipated that the PAC will need additional input from the proposal collaborations during this PAC41 meeting.<br>
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Appendix: Scientific Categories for Nuclear Physics Proposals<br>
1. The Hadron spectra as probes of QCD<br>
(GlueX and heavy baryon and meson spectroscopy)<br>
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2. The transverse structure of the hadrons<br>
(Elastic and transition Form Factors)<br>
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3. The longitudinal structure of the hadrons<br>
(Unpolarized and polarized parton distribution functions)<br>
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4. The 3D structure of the hadrons<br>
(4G: Generalized Parton Distributions and 4T: Transverse Momentum Distributions)<br>
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5. Hadrons and cold nuclear matter (Medium modification of the nucleons, quark hadronization, N-N correlations, hypernuclear spectroscopy, few-body experiments)<br>
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6. Low-energy tests of the Standard Model and Fundamental Symmetries (MOLLER, PVDIS, PRIMEX, …..)<br>
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Susan Brown<br>
Phone: 757-269-7668<br>
Fax: 757-269-5800<br>
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If you pray for rain be prepared to deal with some mud.<br>
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<br><br><br>-- <br><div dir="ltr"><div><div><div>---<br><div>Karl J. Slifer<div>Assistant Professor</div><div>Department of Physics</div><div>University of New Hampshire<br><div>Telephone : <a value="+16037220695">603-722-0695</a></div>
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