From: Chris Seez
Sent: 15 January 2002 13:22
To: David Barney
Cc: Alexandre Nikitenko; Bruce Kennedy; Dave Cockerill; Shuichi Kunori;
banerjee@ehep.tifr.res.in; Sunanda Banerjee; Veikko Karimaki; Philippe
Bloch; Carmen Palomares Espiga; Emilio Meschi
Subject: RE: EE

Might be a good opportunity to update ORCA code to avoid such horribleness! Perhaps Carmen could try and
find all occurences of such hard-wired Z-values, and (discussing with Sasha and Emilio) find solid ways to
reference the measurements to the actual geometry.

There will inevitably be further juggling with Z-values, so this would be a worthwhile investment of effort.

Chris.

On Tue, 15 Jan 2002, David Barney wrote:

> Hi Sasha
> 
> This is fine, but the ORCA routines may also need to be modified as 
> they use the absolute positions (along Z) to correlate hits in the 
> preshower with hits in the EE.
> 
> cheers
> 
> Dave
> 
> -----Original Message-----
> From: Alexandre Nikitenko [mailto:Alexandre.Nikitenko@cern.ch]
> Sent: Tuesday, January 15, 2002 12:04 PM
> To: Bruce Kennedy; Dave.Barney@cern.ch
> Cc: Chris.Seez@cern.ch; Dave.Cockerill@cern.ch; kunori@fnal.gov; 
> banerjee@ehep.tifr.res.in; Sunanda.Banerjee@cern.ch; 
> Veikko.Karimaki@cern.ch
> Subject: Re: EE
> 
> 
> Hi Bruce and Dave,
> 
> it was decided to move in cmsim EE and SF towards the impact point to 
> take into account magnetic field ON effect; Shuichi said they did this 
> in cmsim for HE.
> 
> I'v put this shift as 2.6 cm :
> 
> 2.6 cm is a difference between start of the first Scintillator 
> position in HE nose (in closest to IP 10 degree sector) according to 
> Surkov's number and its position in cmsim -
> 
> 3921.5 mm (from A.Surkov) - 3895.1 mm (from cms124)) = 26.4 mm
> 
> for cmsim in was impact point of geantino to HES1.
> 
> so, I'v rounded it to 2.6 cm. A. Surkov told me that estimated shift 
> calculated some time ago was 25 mm with accuracy 40-50 %, so our shift
> 2.6 cm is within this error.
> 
> I'v corrected
> 
> 1. ecal.tz
> 
>    314.4    #.  zpos - z-position of front of ECAL endcap
> 
> 2. in EC_FFKEY_SUPP.F
> 
> C      FFECFP(2) = 317.2
> C account for fileld ON shift 2.6 cm, so 317.2 - 2.6 = 314.6
>        FFECFP(2) = 314.6
> 
> 
> 3 .esfx.tz taking into account that gap between SF and EE is 0.2 cm
>   (field OFF : end SF 316.8, start EE 317.0)
> 
> *DO  ESFX   3 -n49           #.Title for TDR endcap presh.description
>   314.4  #. ECAL_Z             Z start of ECAL endcap
>   295.7  #. PRESH_Z            Z start of endcap preshower
>    0.20  #. PRESH_ENCA_GAP      gap between presh. and endcap ecal
> 
> 
> please, confirm as soon as possible, that it is the only corrections 
> have to be done in ecal.tz, esfx.tz and .F.
> 
> Sunanda, after Bruce and Dave confirm this, I'll ask you to take into 
> account this shift in ETC2 (and inside it), otherwise SF will overlap 
> with it.
> 
> my present tz files are in ~anikiten/public/cmstest/titl/gtit/ecal.tz
>                                                               esfx.tz
> 
> Cheers, Sasha.
> 
> 
>