09/07/2008 1AGATA – Ch. VEYSSIERE

A. BOUTY; S. BROUSSARD; A. LOTODE; Y. MARIETTE; Ch. VEYSSIERE: CEA/DSM/IRFU/SIS

D. BAZZACCO: Univ. Padova

E. FARNEA; A. GADEA; R. MENEGAZZO: LNL

P. JONES: Univ. Jyväskylä

T. ENGERT; T. HABERMANN; I. KOJOUHAROV: GSI

J. CACITTI; M. TRIPON: GANIL

DSS tests in LEGNARO

22nd to 25th April 2008

09/07/2008 2AGATA – Ch. VEYSSIERE

Goal of these tests

Realized with the detector S001

•To test the AXIS low voltage crate:

– 48V

– ±6V; ±12V for the preamps

– 6.5V for the HV Box (Proto #1)

•To test the HV box in an other environment (GSI (2006) -> LNL)

•To Test the last version of the GUI developed by GSI

09/07/2008 3AGATA – Ch. VEYSSIERE

The “AXIS” Box

09/07/2008 4AGATA – Ch. VEYSSIERE

The AGATA Box

09/07/2008 5AGATA – Ch. VEYSSIERE

S001 – HV Box (proto #1)

09/07/2008 6AGATA – Ch. VEYSSIERE

Poor Man’s Digitiser

09/07/2008 7AGATA – Ch. VEYSSIERE

Means for the tests

•Comparatives tests:

– Patrice Medina 48V / AXIS

– ±6V; ±12V NIM/ AXIS

– 6.5V AXIS + HV Saclay/ Silena module

Following analysis from Dino Bazzacco: PStestsWeek17-1.doc

09/07/2008 8AGATA – Ch. VEYSSIERE

Mechanical mounting of the LV crate

Reference spectrum at high and low gain

AXIS crate mounted (just grounded)

EHG= 2.52 keV at 1332 keV ELG = 2.75 keV at 1332 keV

09/07/2008 9AGATA – Ch. VEYSSIERE

Mechanical mounting of the PLC

PLC mounted (outside of the cabinet) and switched on

Replacement of the 24V PS of the PLC by a linear floating PS; 6V and 12V AXIS on

EHG= 2.57 keV at 1332 keV ELG = 2.63 keV at 1332 keV

09/07/2008 10AGATA – Ch. VEYSSIERE

Test of LV from AXIS (6V, 12V) versus NIM

Final frequency spectra (100 k sample) before shutting down the HVRed: HG LV from AxisGreen: HG LV from NIM binBlue: LG LV from AxisCyan: LG LV from NIM bin

The spectra are very similar, with the ones using Axis slightly better at the lowest frequencies and those using NIM having lower amplitude in the peaks at 23 and 46 kHz.

09/07/2008 11AGATA – Ch. VEYSSIERE

Test of the 48V (1/2)

With the Patrice 48V

With the AXIS 48V

09/07/2008 12AGATA – Ch. VEYSSIERE

Test of the 48V (2/2)

48V AXIS with improvement on the grounding (copper braid shortened)

With the Patrice 48V

Green and blue when adding a 400 and 600W resp.

09/07/2008 13AGATA – Ch. VEYSSIERE

Using a GPBox (dual core preamp. inside)

Red: 6, 12 and 48 V Axis

Green: LV NIM, 48V Patrice

09/07/2008 14AGATA – Ch. VEYSSIERE

Comparison of AGATA and Silena HV

•Using AXIS LV•Energy resolution (in keV) derived from INP

Unfiltered Filteredwith 3 s

Filteredwith 6 s

HV Silenahigh gain

15.2 1.75 1.43

HV AGATA

high gain

15.4 1.66 1.44

HV Silena low gain

18.6 1.82 1.59

HV AGATA

low Gain

18.8 1.74 1.62

09/07/2008 15AGATA – Ch. VEYSSIERE

Noise spectra after 6 s shaping trapezoidal shaping

Red HV Silena (high gain signal)Green HV AGATA “” Blue HV Silena (low gain signal)Cyan HV AGATA “”

09/07/2008 16AGATA – Ch. VEYSSIERE

Integrated power spectra after ~6 s trapezoidal shaper

Red HV Silena (high gain signal)Green HV AGATA “” Blue HV Silena (low gain signal)Cyan HV AGATA “”

keV

09/07/2008 17AGATA – Ch. VEYSSIERE

Problems to be solved:

•Voltage regulators associated to long cables generate oscillations: regulators to be changed,

•Temperature too high in the 48V module:

– Geometry to be modified to improve the air path on the heat sink,

– Vicor 600W PS to be tested. To check its influence on the signal,

– Water cooling?

•When profibus is reconnected, the crate stops briefly,

•Safety of the 6 and 12V should not be linked with the 6.5V (when 6 and 12V stop, HV stops also),

•48V offset to be reduced,

•Connectors (front panel Sub-D, 24V connectors, Profibus-DP)

09/07/2008 18AGATA – Ch. VEYSSIERE

Some problems can be avoided…

•Reconnecting the PA when voltage is set induces an inrush current that trigs the safety of the 6 and 12V: not to be done… Removing the safety on the overcurrent might be dangerous in some cases.

July tests of revised AXIS box at Legnaro – on platform

-Production Digitiser-Detector (Single detector ?)-Integration with rest of DSS ongoing

09/07/2008 19AGATA – Ch. VEYSSIERE