Date: Mon, 20 Aug 2001 17:21:17 -0700 (PDT) From: Bernhard Lauss X-Sender: lauss@glueball.lbl.gov To: kammel@npl.uiuc.edu Subject: Magnet Specifications Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII These are the specifications for the present magnet which were used in the most recent calculation for the magnet just outside of ePC2. form: saddle-coil length: 122 cm (in beam direction) diameter: 68 cm (perpendicular to the beam direction) windings: 20 on upper and 20 on lower coil approximate weight of the coil: 25 kg temperature rise of PSI tub water (starting at approximately 10 degree C) for the below given current: with 1 watercircuit per coil-half: 20 degrees C with 2 watercircuits per coil-half: 10 degrees C current for a central field of 70 Gauss: 160.95 A variation of the field inside the active volume of the TPC defined as (16 * 30 * 12 cm): B_tot = 70 + 0.3/ - 1.4 gauss B_z = 70 + 0.3/ - 1.4 g B_x = 0 +/- 0.05 g B_y = 0 +/- 0.2 g Variation of the total field (B_tot) at the likely positions of the hodoscope's photo-multiplier: Position 1: 50 cm from the TPC center in beam direction and: 40 cm out: 50 g (out means distance to beam-axis) 50 cm out: 25 g 60 cm out: 17 g 70 cm out: 12 g 100 cm out: 5 g Position 2: 60 cm from the TPC center in beam direction and: 40 cm out: 40 g 50 cm out: 20 g 60 cm out: 12 g 70 cm out: 10 g 100 cm out: 5 g