[Lowq] [Fwd: RTPC readout electronics update]

[Stepan Stepanyan]

FYI

-------- Original Message --------
Subject: 	RTPC readout electronics update
Date: 	Thu, 03 Sep 2009 11:19:01 -0400
From: 	Andrea Celentano <celentan at jlab.org>
To: 	Raffaella de Vita <devita at ge.infn.it>, stepanya at jlab.org, 
saverio.minutoli at ge.infn.it, boiarino at jlab.org, battaglieri at ge.infn.it, 
stephenb at physics.odu.edu, dupre at jlab.org
CC: 	Magnus.Mager at cern.ch, attiq.ur.rehman at cern.ch



Hi all,
	here are some updates about the eg6 readout electronics.
I`ve modified the program which set-up the readout system, according to
Magnus and Attiq indications, to perform a parallel readout (i.e. if
there are FECs on both branches, RCU reads first a channel from one FEC
on branch A, then a channel from another FEC on branch B, then another
channel from the previous FEC on channel A and so on).

I`ve done some tests to see what is the maximum trigger frequency after
this change, and here are the results.
You can find every file at http://www.jlab.org/~celentan/test.tar.gz

1) Using 4 FECs on both branches (0 1 16 17) and zero suppression with
threshold 200 chs, the maximum trigger frequency is 4740 Hz. 
Event size -> 2116 Bites
Bump of readout list -> test_new1.txt

2) Using 4 FECs on both branches (0 1 16 17) and zero suppression with
threshold 73 chs, the maximum trigger frequency is 4560 Hz. 
Event size -> 3000 Bites
Bump of readout list -> test_new2.txt

3) Using 6 FECs on the same branch (0 1 2 3 4 5) and zero suppression
with threshold 200 chs, the maximum trigger frequency is 1640 Hz. 
Event size -> 3140 Bites
Bump of readout list -> 6same.txt

4) Using 6 FECs on both branches (0 1 2 16 17 18) and zero suppression
with threshold 200 chs, the maximum trigger frequency is 3220 Hz. 
Event size -> 3140 Bites
Bump of readout list -> 6different.txt

5) Using 8 FECs on both branches (0 1 2 3 16 17 18 19) and zero
suppression with threshold 200 chs, the maximum trigger frequency is
2440 Hz. 
Event size -> 4164 Bites
Bump of readout list -> 8different.txt


Sorry i did not use the lowq mailing list but seems that i can't post on it.

Best Regards

Andrea
-- 

Andrea Celentano

Università di Genova, Dipartimento di Fisica:
celenta5 at didattica.fisica.unige.it

Jefferson Laboratory:
celentan at jlab.org
http://www.jlab.org/~celentan