Difference between revisions of "BLTWG Meeting 5/15/2008"
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====Updates to Beamline Specifications [RTJ]==== | ====Updates to Beamline Specifications [RTJ]==== | ||
In preparation for discussion of the pair spectrometer specification, I went over the [[Photon Beam Design Requirements|Global Specifications for the Hall D Photon Beam]] page. A number of these items have come under scrutiny during the last few months, and some of them need to be changed. I have updated the following items in the Global Specifications table on [[Photon Beam Design Requirements|the main beamline specs wiki page]]. | In preparation for discussion of the pair spectrometer specification, I went over the [[Photon Beam Design Requirements|Global Specifications for the Hall D Photon Beam]] page. A number of these items have come under scrutiny during the last few months, and some of them need to be changed. I have updated the following items in the Global Specifications table on [[Photon Beam Design Requirements|the main beamline specs wiki page]]. | ||
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| + | # '''the upper limit on the range of the tagging hodoscope''' - changed from 11.4 GeV (old value) to 11.7 GeV (new value). It is a priority for Hall D to provide tagged photons of the highest energy possible at Jefferson Lab. As shown in [ my talk on Endpoint Tagging at the May 2008 collaboration meeting], the Hall D tagger acceptance extends up to 11.7 GeV. Right now we are modifying the layout of the hodoscope counters above 9 GeV, so it is a good time to change the spec on the upper photon energy limit to 11.7 GeV. | ||
====Pair Spectrometer Specification==== | ====Pair Spectrometer Specification==== | ||
Revision as of 13:53, 15 May 2008
- Time: 10:00 EST
- Place: EVO and ESNET
- Present: Jim Whitlatch, Tim Stewart, Richard Jones, Franz Klein, Dan Sober, Elke Aschenaur, Eugene Chudakov
Contents
Agenda
- Discussion of the pair spectrometer specifications
- Items required for the Lehmann Review
Notes by R. Jones
Updates to Beamline Specifications [RTJ]
In preparation for discussion of the pair spectrometer specification, I went over the Global Specifications for the Hall D Photon Beam page. A number of these items have come under scrutiny during the last few months, and some of them need to be changed. I have updated the following items in the Global Specifications table on the main beamline specs wiki page.
- the upper limit on the range of the tagging hodoscope - changed from 11.4 GeV (old value) to 11.7 GeV (new value). It is a priority for Hall D to provide tagged photons of the highest energy possible at Jefferson Lab. As shown in [ my talk on Endpoint Tagging at the May 2008 collaboration meeting], the Hall D tagger acceptance extends up to 11.7 GeV. Right now we are modifying the layout of the hodoscope counters above 9 GeV, so it is a good time to change the spec on the upper photon energy limit to 11.7 GeV.
Pair Spectrometer Specification
The discussion centered around the main tasks that the Hall D pair spectrometer must be designed to perform.
- monitoring the photon beam spectrum This is needed for polarized beam running in order to be able to continuously monitor the polarization of the beam.
