Log entry time 11:31:05 on December 4,1999

Entry number 30577

• If the new P₀ is less than the previous P₀ or P₀ is greater than 3.7 GeV/c simply type in the new P₀ on the main control screen.


• If the new P₀ is greater than the previous (but less than 3.7 GeV/c), or you're starting from magnets off, or you've just changed polarity for the spectrometer proceed as follows:

1. In the control panel for each quadrupole power supply (accessible from the main control screen) set the current to the following values: Q₁ 3000 Amps, Q_2/3 1600 Amps. This is done in the yellow box bracketed by the words Current Set and Amps. (Reminder: as with all the controls the pointer must be in the box while you're typing)


2. Wait for the magnets to stabilize at those currents.


3. Type in the new P₀ on the main control screen.

Before initiating the 2^nd quadrupole setting procedure above: Type in the approximate target dipole current for the desired P₀ in the dipole power supply control screen. (Also in the yellow box bracketed by the words Current Set and Amps). This will change automatically when you execute step 3 above.

 * For cycling purposes only. At 3.73 GeV/c Q₂ on the Electron arm reaches 1600 Amps. So for Q₂ electron there is no need to cycle above 3.73 GeV/c. (Hadron arm does not go above 3.2 GeV/c) Power supplies and magnets are designed to go to 3250 and 1800 respectively, but let's not go there unless we have to.