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uRadCalc.txt

Kyle Hazelwood, 01/15/2015 11:47 AM

 
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Calc scale-factor from magnet strength::(see note book p146)
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--------------------------------------------------
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thet = B*L/(Beta*Roh)
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thet(defection) = Radians
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B*L = field flux = TM = Teslar * Meter = Gauss * Meter * 10E-4 = GM * 10E-4
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Beta*Roh = 3.3356 * P, P in GeV/C
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For MI-h corrector 'G/A' 233.497 (Gauss.foot/amp)
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convert to 0.007117 Teslar.meter/amp 
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At p = 10 GeV/C 
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Theta/Amp = 0.007117 / (3.3356*p) = 0.00021336 Rad/Amp = 213.36 uRad/Amp
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G-table raw setting 1 lsb(G-1-lsb)  2/3276.8 amp to produce  0.1302 uRad 
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with scale-factor value sf = 1/.1302 = 7.679  G-1-lsb produce 1 uRad.
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For MI-v corrector 'G/A' 103.314 (Gauss.foot/amp)
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with scale-factor value sf = 1/.0576 = 17.36  G-1-lsb produce 1 uRad.
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Code in PA1666
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--------------
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 if (spars.if_3bump==0) sts = alg_3bump1();
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 else if (spars.if_3bump==1) sts = alg_svd();
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 else sts = alg_lssol();
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--------------
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alg_lssol calls:
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 sts = sorbit_ls_lssol(nced,nbpm,betac, betab,psic,psib,
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           tune[pl],cor->stepcut,dx1,lb,ub,
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           dthet,dx2,&status);
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 input dx1 in mm
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 output dthet in mRad(milli-radians)
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--------------
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Read g-table in cards before apply corrections
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In corr3_g1
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    sts = c453_td(GET,cor->plane,MDAT_GTABLE,spars.gtable_num,
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                  spars.slot+1,1,cor->g1.x.shorts,&ndis);
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--------------
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add dthet in uRad:
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 for (i = 0; i < RING_SIZE; i++) {
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    if (cor->useced) cor->g2[i] = (short)(cor->g1.x.shorts[i] + 
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                  cor->dthet[i] * 1000. * p_scale);
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    /* '1000' to convert to uR,p scaled to 10 Gev/c where s.f. is defined */ 
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  }
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--------------
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 sts = c453_td(SET,cor->plane,MDAT_GTABLE,spars.gtable_num,
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               spars.slot+1,1,cor->g2,&ndis);
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See arguments in c453_td: scale = FALSE, slot_use = SLOT_WHOLE
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set values in cor->g2 are in raw unit(1 raw input => 1 uRad, 
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with the help from scale factor)