Proposal #: PR 04-002 Hall A

Title: Hadronization in Nuclei by Deep Inelastic Electron Scattering

Contact Person: Kebin Wang (UVa)

Beam Time:

Beam days requested: 15

Tune-up (incl. calibrations) time included in request: 1.5

Basic Equipment

Beam parameters:

Energy: 6 GeV yes

Current: 100 µA yes

Polarization: 0 % yes

Targets:

Nuclei: C, Cu, W, 15 cm LH2 and LD2 yes

Rastering: yes yes

Spectrometers:

both HRS standard setup yes

Special Requirements: none

Comments:

Cooling may be required for the solid targets to be able to handle beam currents of 100 mA. Because tungsten generally comes in a sintered form, in which it can not stand a high current, it might be advisable to use platinum instead.

Proposal # PR-04-007 Hall: A

Title: Precision Measurement of the π^o near Threshold: A Test of Chiral QCD Dynamics

Contact person: Richard Lindgren (UVa)

Beam time:

Beam days requested: 16

Tune-up (incl. calibrations) time included in request: 5

Basic Equipment

Beam parameters:

Energy: 0.8 - 4.0 GeV yes

Current: 5 µA yes

Polarization: 0 % yes

Targets:

Nuclei: 10 cm LH₂ no

Rastering: yes yes

Spectrometers:

septum magnets no

both HRS standard setup yes

Big Bite dedicated detector no

RCS lead-glass calorimeter Big Bite calibration no

Special requirements:

1. The proposed 10 cm long target cell with 10 µm walls will represent a serious R&D project.

2. Assumes helium bag inside Big Bite and MWDCs as detectors

3. Requests RCS calorimeter, but this is now part of the BigCal calorimeter

Comments:

None

Proposal # PR-04-011 Hall: A

Title: Photoproduction of Q⁺ via the g + d -> Q⁺ + L Reaction

Contact person: Stephen Wood (JLab)

Beam time:

Beam days requested: 7

Tune-up (inc. calibrations) time included in request: 2

Basic Equipment

Beam parameters:

Energy: 1.2 GeV yes

Current: 50 µA yes

Polarization: 0 % yes

Targets:

Radiator Cu 6 % X0 yes

Nuclei: 15 cm LD2 yes

Rastering: yes yes

Spectrometers:

HRSL standard setup yes

plastic scintillator array no

Big Bite with aerogel no

Special requirements:

1. Requires aerogel detector in Big Bite.

2. Requires (undefined) array of plastic scintillators from GEn or SRC experiments

Comments:

Proposal # PR-04-012 Hall: A

Title: High Resolution Study of the 1540 Exotic Sate

Contact person: Bogdan Wojtsekhowski (JLab)

Beam time:

Beam days requested: 47

Tune-up (inc. calibrations) time included in request: 0

Basic Equipment

Beam parameters:

Energy: 2.0, 4.5, 6.0 GeV yes

Current: 100 µA yes

Polarization: 0 % yes

Targets:

Nuclei: Be, C, 50 cm gaseous deuterium no

Rastering: yes yes

Spectrometers:

septum magnets no

HRSL standard setup yes

HRSR standard setup yes

Big Bite spectrometer no

plastic scintillator array no

Comments:

1. Requires development of

a 50 cm long gaseous deuterium target (of which the proposed design with 25 µm thick Al windows will not work and the alternative of 100 µm thick Be windows constitutes a major R&D project)

a new scattering chamber for out-of-plane BigBite positioning

installation of neutron detector (of which the origin is not clear)

2. Provide an estimate of the accidental coincidence rate in BigBite

Proposal # PR-04-015 Hall: A

Title: Precision Measurement of Longitudinal and Transverse Response Functions of Quasi-Elastic Electron Scattering in the Momentum Transfer Range 0.55 GeV/c < q < 1.0 GeV/c

Contact person: Seonho Choi (Temple)

Beam time:

Beam days requested: 29

Tune-up (inc. calibrations) time included in request: 3

Basic Equipment

Beam parameters:

Energy: 0.4 - 3.6 GeV yes

Current: 50 µA yes

Polarization: 0 % yes

Targets:

Nuclei: ⁴He, ¹²C, ⁵⁶Fe, ²⁰⁸Pb yes

Rastering: yes yes

Spectrometers:

HRSL standard setup yes

HRSR standard setup yes

Special requirements:

None

Comments:

1. Requires so many frequent energy changes which will impact operations in the other Halls to such a degree that it will have to be scheduled for single-hall running.

Proposal # PR-04-018 Hall: A

Title: Elastic Electron Scattering off ³He and ⁴He

at Large Momentum Transfers

Contact person: Makis Petratos (Kent State)

Beam time:

Beam days requested: 36

Tune-up time included in request: 0

Basic Equipment

Beam parameters:

Energy: 0.8 - 4.4 GeV yes

Current: 100 µA yes

Polarization: 0 % yes

Targets:

Nuclei: 20 cm ³He, ⁴He no

Rastering: yes yes

Spectrometers:

HRSE standard setup yes

HRSH standard setup yes

Special requirements:

none

Comments:

1. Requires many frequent energy changes which in combination of the use of the high-power Helium target impacts operations in the other Halls to such an extent that it might be scheduled for single-hall running.
2. Further design work is needed for the 20 cm long cells, since the support rods in the present configuration interfere with the acceptance.
3. This proposal can only be presented to the PAC if the requisite lists of resources and beam requirements has been provided in a timely fashion.