sPHENIX tracking discussion

["Huang, Jin" <jhuang AT bnl.gov>]

Hi, Tony

 

As I understand these length are covering to pseudo-rapidity of 1.1 from z = 0 cm. However, I would prefer it covers for larger z range, which at least match the length of MAPS (+/-14cm). In that scenario, a minimal length could be set by given radius intersecting a straight line connecting the outer corner of TPC active volume (R, z = 78, 104 cm) and the far corner of MAPS layer 3 (R, z ~ 3.9, 13.5 cm).

 

Cheers

 

Jin

 

______________________________

 

Jin HUANG

 

Brookhaven National Laboratory

Physics Department, Bldg 510 C

Upton, NY 11973-5000

 

Office: 631-344-5898

Cell:   757-604-9946

______________________________

 

From: sphenix-tracking-l-bounces AT lists.bnl.gov [mailto:sphenix-tracking-l-bounces AT lists.bnl.gov] On Behalf Of Frawley, Anthony
Sent: Wednesday, September 7, 2016 5:32 PM
To: sphenix-tracking-l AT lists.bnl.gov
Subject: [Sphenix-tracking-l] INTT layer length

 

Hi All,

 

I made some estimates of the required length of the silicon strip layers in the intermediate tracker. The lengths required to match our acceptance of eta within +/- 1.1 units are:

 

Radius (cm)          length (cm)       minimum sensors/half-ladder

6.0                              +/- 8.1                    7 x 2 = 14

8.0                            +/- 10.7                    9 x 2 = 18

10.0                          +/- 13.4                    12 x 2 = 24

12.0                          +/- 16.1                    14 x 2 = 28

 

where the minimum sensors /half-ladder number assumes 1.2 cm long sensors, and is rounded up to completely cover the acceptance.

 

Cheers

Tony