[Bteam] Fwd: Log entry notification: : M56 0R optics

[Jay Benesch]

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-------- Original Message --------
Subject: 	Log entry notification: : M56 0R optics
Date: 	Fri, 20 Jan 2012 09:50:08 -0500 (EST)
From: 	elogadm at jlab.org
To: 	benesch at jlab.org, bteam at jlab.org, freyberg at jlab.org



1660807 <http://opsweb.acc.jlab.org/CSUEApps/elog/entry/1660807>	M56 0R
optics
20-Jan-2012 09:49	J_Benesch	BTLOG
<http://opsweb.acc.jlab.org/CSUEApps/elog/elog.php?logbook=BTLOG>

I give the details below and can send the two Optim files I'm using to 
anyone who's interested.  My conclusions:

1. HLA will have to change the spreadsheet which contains the Twiss 
parameters for matching if we make the change
2. HLA will have to change the scaling factor for MQD1L02 in the lem 
magnet config file if we make the change	
3. The even recombiners will re-inject into a linac with one third less 
focusing at the third girder, 1L02, but the re-injection should still be 
dominated by 1L00 7064G and 1L01 -5792G.
4. I can't decide whether we should download the 0L06-0L10 quads in the 
M56 optics and then rematch or simply change the 0R quads and rematch. 
Opinions?

I can't capture screen shots on my PC using DTlite any more.  I printed 
out the Optim beta plots and will ask Ops to scan them into another BTlog.

The Optim quad values for the isochronous optics in the machine now are
qMQD0L06.BDL 1 441.753    after matching: 466
qMQD0L07.BDL 1 -425.121   matched -446
qMQD0L08.BDL 1 723.395   matched 802
qMQD0L09.BDL 1 -504.951  matched -501
qMQD0L10.BDL 1 611.353   matched 523
qMQD0R01.BDL 1 -679.246  machine -678
qMQD0R02.BDL 1 1011.524  machine -1010
qMQD0R03.BDL 1 -383.303  machine -383
qMQD0R04.BDL 1 709.414   machine 691  dispersion correction
qMQD0R05.BDL 1 -396.113  machine -395
qMQD0R06.BDL 1 997.192   machine 995
qMQD0R07.BDL 1 -693.064  machine -692
qMQD1L02.BDL 1 364.671   *** 499.6 G in the machine, 1.37 times as much, 
which is very likely because the NL in the Optim file is at 400 
MeV/linac vs 548,  548/400=1.37.

Chris Slominski tells me that lem calculates the 120 degree FODO lattice 
and scales MQD0L02 by 0.872277 .  This value may be changed in a config 
file.   We match to Twiss parameters at the exit of MBL0R04 dipole.

Parameters at exit of element 252 (GMBL0R04)  for isochronous optics:
BetaX[cm]=1647.78 	BetaY[cm]=754.051
AlfaX=-4.02897     	AlfaY=1.65009

-----------------------
For M56=25cm optics, at 44.49 MeV/c from the injector, quads are:

I don't know whether we should change the 0L quads via download or 
simply re-match.
scale quads by 1.3857 for momentum ratio 61.65/44.49
qMQD0L06.BDL 1 312.651
qMQD0L07.BDL 1 -326.121
qMQD0L08.BDL 1 571.405
qMQD0L09.BDL 1 -339.211
qMQD0L10.BDL 1 305.474
qMQD0R01.BDL 1 -180.000
qMQD0R02.BDL 1 0.000
qMQD0R03.BDL 1 -90.000
qMQD0R04.BDL 1 197.718
qMQD0R05.BDL 1 -90.000
qMQD0R06.BDL 1 0.000
qMQD0R07.BDL 1 -180.000
qMQD1L02.BDL 1 237.471  ** 65.1% of value above for 400 MeV linac, 
364.67 G, in isochronous

Twiss parameters
Parameters at exit of element 210 (GMBL0R04) element number changes 
because early injector not in this file
BetaX[cm]=2931.74 	BetaY[cm]=618.324
AlfaX=-2.43708     	AlfaY=1.30684