General Meeting Minutes 11/6/09

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Contents

Participants

H. S. Abdalghaffar, A. Accardi, A. Afanasev, K. Beard, A. Bogacz, J.P. Chen, C. Cuevas, R. Ent, J. Gomez, V. Guzey, T. Horn, C. Hyde, N. Kalantarians, G. Krafft, R. Li, A. Prokudin, B. Terzic, P. Nadel-Turonski, C. Weiss, Y. Zhang

Report from accelerator parallel session, Tuesday, 3 November 2009

  • The impression of participants in the accelerator session is overall positive. One question that came up in that session are interactions between interaction points in the figure-8 design. However, these are not an issue in terms of luminosity or background for the EIC@JLAB as there are never two high luminosity/high energy interaction points together. The design includes one medium and one low energy point and the electron ring is on two different levels.
  • The EIC advisory committee seemed to appreciate that the ring size of the EIC@JLab had been optimized for high luminosity over a range in s between 200 GeV2 and 1200 GeV2, where it is most difficult to achieve yet needed the most, but also had a capability to cover energies up to s=2600 GeV2, at lower luminosities, where it is less critical. Nevertheless, it was concluded that it was important to always show the luminosity curve illustrated in Figure 1, to avoid confusion on this point.

Report from EICAC science/detector parallel session

  • The impression of the science/detector session was also positive. The general list of detector R&D topics include low mass tracking, PID up to 4-5 GeV, compact readout in a magnetic field, electronics and data acquisition, and hadron polarimetry.
  • Chris Cuevas' on talk on data acquisition and electronics at high luminosity was well received by the committee, which did not indicate that they saw any major issues with going to 1.5 GHz.
  • The concept of the planned detector simulations in GEANT4 was appreciated and further steps in the development of a Fast MC encouraged.

EICAC closeout summary

  • During the closeout, the committee addressed topics such as the science case, the collaboration, and the accelerator.
  • Regarding the science case, the impression was that there was a lot of progress, that the effort was well organized in certain aspects, and the core measurements form a good basis for the next long range plan though they are not yet complete.
  • The collaboration did ok involving more people, but efforts could be further optimized by, e.g., user sessions at the DNP.
  • The committee emphasized the importance of R&D work, in particular, of the detector design using a Fast Monte Carlo and GEANT simulations to check the design.
  • Regarding the accelerator design, the committee recommended more detailed design work and an internally reviewed cost estimate for the accelerator design for the next meeting.

Goals for upcoming meetings in 2010

  • Rolf shows the MEIC timeline generated at the 17 April and July MEIC meetings and discusses the current status and goals for the upcoming EICC meeting at Stony Brook University (10-12 January 2010) and the next EICAC meeting in June 2010. For the Stony Brook meeting, everyone is encouraged to contribute. The goals for the next EICAC meeting are (see slides for details):
  • Accelerator:
  1. Prove that the design is workable, e.g., progress beyond first order lattice (full electron/ion)
  2. Internal cost review
  3. Second stage electron energy (we likely do not need to limit to 11 GeV in the large ring)
  • Nuclear Physics
  1. Engage user community more, e.g., user workshops
  2. Fast MC, take next steps, note the next simulation group meeting is on Monday 16 November in the afternoon
  3. GPD, deep exclusive/SIDIS theory, interpretations, e.g., interest in transverse imaging, but in correlations in the longitudinal nucleon wavefunction to access interesting dynamics

Default energies for simulations

  • Rolf notes the default energies to consider for simulations for upcoming meetings:
* 5 x 50, which is like 4 x 60 at JLab
* 10 x 50, which is like 11 x 60 at JLab
* 10 x 250
* 20 x 250, which is like 25(?) x 250 at JLab

Next meeting

  • The next meeting will be on Friday.

Rolf's Slides

Figure 1: Energy dependence of the luminosity

Figure 1: for simplicity momentum scaling is only applied to the (M)EIC (blue area) in this illustration. For all other entries, the maximum luminosity is shown over the full range. Note: EW=ElectroWeak, DES=Deep Exclusive Scattering (photons, pseudo-scalar and vector mesons), SIDIS=Semi-Inclusive Deep Inelastic Scattering, DIS=Deep Inelastic Scattering, DIFF=DIFFractive scattering, JETS=JET Production.