Draft Run Plan 2/23/11
Feb-March 2011 Run Plan
Draft: February 23, 2011
(1) Radiator out, collimator hole blocked, dump magnet withdrawn, kicker magnet off, Faraday cup in, downstream viewscreen in with camera on it.
Establish “good” beam. Here, we want spots on upstream and downstream viewscreens as small as reasonably possible, and centered on nominal beamline.
While tuning is going on, look at Faraday cup signals in counting room, and assess if they are ok.
(2) Kicker magnet on. Slowly move beam down, and then up, and watch in on the downstream viewscreen. Note and document shape of beamspot when kicker magnet is changed. Check to see if kicker magnet introduces any horizontal deflection. Check on the viewscreen to see if beam position is reproducible when kicker magnet current is changed and then returned to original value.
(3) Calibration of kicker magnet current versus beam position with viewscreen. Move beam up and down +-X???cm, and note the kicker magnet currents. Do this for several points.
(4) Calibration of kicker magnet current versus beam position with Faraday cup.
Take ADC data for 5-7 kicker magnet positions.
(5) Get access to accelerator hall. Move in beam dump magnet. Remove Faraday cup. Remove block of photon collimators. No physics target in shielded cell. Kicker magnet OFF.
(6) With bremsstrahlung radiator out, access situation in shielded cell. Check rates in pair spectrometer detectors and neutron detectors, normalized to the number of pulses. We want them to be low.
(7) Repeat (6) with kicker magnet on, with beam in UP and DOWN positions.
(8) Beam off. Put in radiator. Kicker magnet off. Beam on. Check rates in pair spectrometer and neutron detectors normalized to the number of pulses. Ascertain best pair converter thickness.
(9) Repeat (6) with kicker magnet on, with beam in UP and DOWN positions.
(10) Put in D2O physics target. Produce a neutron time of flight spectrum. (Bunch of details left out here.)
(11) Do ADC runs for neutron detectors. Set gates, ADC ranges… Match gains and thresholds.
(12) Try to plateau one of each kind of pair spectrometer detectors.
(13) Get a good neutron time of flight spectrum for D2O (unpolarized).
(14) Get a good neutron time of flight spectrum for H2O (unpolarized).
(15) Kicker magnet on, beam in UP position. Get a good neutron time of flight spectrum for D2O.
(16) Kicker magnet on, beam in UP position. Get a good neutron time of flight spectrum for H2O.
(17) Kicker magnet on, beam in DOWN position. Get a good neutron time of flight spectrum for H2O.
(18) Kicker magnet on, beam in DOWN position. Get a good neutron time of flight spectrum for D2O.
(19) Analyze data with scalers. See if we have an asymmetry.
(20) Put in various physics targets. Run for beam UP/DOWN.
(21) (Possibly) put in various beam hardeners. Take asymmetry data.