The SOS Quad in the Right-HRS (RHRS)
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1 The SOS Quad in the Right-HRS (RHRS) Barak Schmookler Apex- Apr. 19,
2 Current Status of the RHRS The HRSs (RHRS and LHRS) are QQDQ spectrometers. Quadrupole 1 (Q1) focuses in the dispersive (i.e. bend) plane, while Q2 and Q3 focus in the non-dispersive direction. For the RHRS Q1, a rapid, non-linear voltage increase across the two leads was observed with an increase in current. Because of this, Q1 has been removed from the RHRS; and it is not be used during the current Spring 2015 run. Apex- Apr. 19,
3 RHRS Q1: Voltage Across Leads Voltage Drop Over Leads Current in Magnet Apex- Apr. 19,
4 Status of the Q1s The old leads on the RHRS Q1 will be replaced with ones similar in construction New leads have been ordered. The Q1 on the LHRS is showing similar problems, and is thus being limited to 3.2 GeV/c Apex- Apr. 19,
5 RHRS Q1 Disassembly Apex- Apr. 19,
6 The SOS Spectrometer The SOS spectrometer, located in Hall C, had a QDD design. The spectrometer operated up to a momentum of ~1.75 GeV/c. The SOS quad has a radius of 12.7cm (Q1 radius = 15cm). It has a magnet length of 70cm (Q1 length = 94cm).It was operated to a maximum pole-tip field of ~1T in the spectrometer. The pole tips are planes, rather than curves. The dipoles, which shared the same iron yoke, limited the spectrometer momentum. So, the quad was not operated at its maximum potential current/field. Apex- Apr. 19,
7 The SOS Quad Front View Side View Apex- Apr. 19,
8 The SOS Quad in the RHRS The SOS quad is now mounted in the spectrometer as shown. The magnet requires water cooling, which will be taken from the system already present on the RHRS. The power supply for the Q1 has been removed, and a different power supply will be used for the SOS quad. Apex- Apr. 19,
9 Selecting the Tune Two Options: 1) Match old tune. Adjust SOS Quad Bdl. Use previous reconstruction matrix and look at reconstructed y:y' and reconstructed sieve pattern. 2) Make new tune to maximize acceptance. Adjust SOS Quad Bdl. Look at optics target and sieve pattern at the focal plane (and reconstructed variables with old tune). Apex- Apr. 19,
10 Tune for Q1 in RHRS 1 f = el c db α dα p Q1 has length of ~94cm, radius 15cm Apex- Apr. 19,
11 Pole-Tip Field vs Current in SOS Quad Highest Field used in SOS Spectrometer: ~1.1Tesla (~705 A) Apex- Apr. 19,
12 Initial Guess to Match Q1 Bdl Want to scale pole-tip field up at: 3300 Gauss/GeV We measured B vs. I with hall probe: 15.5 Gauss/Amp Thus we want to scale at current at: 213 Amp/GeV Apex- Apr. 19,
13 Simulation Studies of the RHRS The program Cosy Infinity was used to model the magnetic elements of the spectrometer. I used an idealized quad magnet with limited fringefield effects for these simulations. More complete simulations using field-maps may be forthcoming in the near future Position and momentum variables after the magnetic element are determined by summing the product of matrix elements to a given order: X after = i+j+k+l+m=n i,j,k,l,m=0 c i,j,k,l,m X i dx k dy Yj dz dx l δp m Apex- Apr. 19,
14 Simulation Studies of the RHRS (cont.) In conjunction with the program SIMC, generated particles are passed to the focal plane of the spectrometer. They are then reconstructed to obtain the target quantities: X`tar [θ tar ], Y`tar [φ tar ], δ tar, Y tar The effect of replacing the Q1 with the SOS quad on the acceptance and resolution of these target quantities are considered here. Apex- Apr. 19,
15 Cosy Infinity Ray-Tracing: Standard RHRS, Dispersive (and Bend) Plane Apex- Apr. 19,
16 Cosy Infinity Ray-Tracing: Standard RHRS, Non-Dispersive Plane Apex- Apr. 19,
17 Cosy Infinity Ray-Tracing: RHRS with SOS Quad, Dispersive (and Bend) Plane Apex- Apr. 19,
18 Cosy Infinity Ray-Tracing: RHRS with SOS Quad, Non-Dispersive Plane Apex- Apr. 19,
19 Acceptance Comparison: (e,e ) Elastic Regular RHRS Q1 Removed SOS Quad SOS Quad set to match field integral (Bdl) of Q1 Apex- Apr. 19,
20 Single Arm Version of SIMC I recently completed a single arm (phase-space generator) version of SIMC. This can be used for single arm acceptance studies, as well as to look at sieve patterns. Apex- Apr. 19,
21 Effects of Mistuning on Reconstructed Sieve Pattern: Simulation Apex- Apr. 19,
22 Data with Optics Target: Initial Guess rms = 5.5mm Apex- Apr. 19,
23 Data with Optics Target: Initial Guess rms = 5.5mm This does not tell us about the actual resolution at this setting. Just how well the forward and back transport match. Apex- Apr. 19,
24 Data with Optics Target: +10% rms = 8.8mm Apex- Apr. 19,
25 Data with Optics Target: -5% rms = 2.2mm Apex- Apr. 19,
26 Looking at Acceptance in the Focal Plane Apex- Apr. 19,
27 Looking at Acceptance in the Focal Plane +10% -10% Apex- Apr. 19,
28 Potential Angle Calibration: GEM Detector Make use of large pion rate (compared to electron rate) Place GEM detector between target and spectrometer (no sieve needed) Available detector can cover whole entrance of spectrometer. Uses Ar/CO 2 gas and has position resolution of microns. Apex- Apr. 19,
29 What we are doing this run period Standard optics (sieve, optics target, delta scan) for different SOS Quad tunes Check dependence of tune on spectrometer momentum setting Check if the SOS quad is mis-aligned from the spectrometer axis (Look for any effect on central sieve hole while ramping up current in the SOS Quad) Apex- Apr. 19,
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