15 October 2013 CHANTI Status Report F. Ambrosino, T. Capussela, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, L. Roscilli, G. Saracino Università

15 October 2013

CHANTI Status Report

F. Ambrosino, T. Capussela, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, L. Roscilli, G. Saracino

Università degli Studi di Napoli “Federico II”, and INFN Sez. Napoli

CHANTI Status Report

OUTLINE

FEE noise preliminary test @ LNF

Vessel mechanical design

15 October 2013 CHANTI Status Report

FEE noise preliminary test @ LNF


Testing CHANTI board in crateCHANTI board tested in the low noise Wiener crateHigh and low voltage supplied by crate.An oscilloscope acquired output waveforms in two configuration: Single channel self-trigger Crate switching trigger


5 m

V/d

iv





5 m

V/d

iv



2 m

V/d

iv



2 m

V/d

iv


Noise lower than 5 mV peak to peak


Testing CHANTI board in crateCHANTI board tested in the low noise Wiener crateHigh and low voltage supplied by crate.

Then we studied the noise induced by the cable from the flange to the CHANTI BOARD (an amplification 25X is applied to the input signals).

To reduce this noise we applied (following G. Corradi suggestion) an RC filter to the shield in order to cut the common mode current.

After some test in Naples and at LNF the noise has been quoted to be of the order of 25mV

The cable induced noise depends by the ambient condition:today evening test at ECN3



ToT board for CHANTI: some change

ToT board some reminds


The standard ToT board hasGain = 3 (5) XHysteresis = 3 mV in order avoid false trailing due to noise

Leading Thr

Trailing Thr

HysteresisThreshold at 10 mV Hysteresis at 3 mV

Hysteresis must compare with noise level!



Since the noise picked-up by the cables is pre-amplified by the CHANTI board, the level of hysteresis seems not adequate for our purposes. Change have been applied to the ToT board:

Gain = 3 and Hysteresis = 9 mV,threshold with the same granularity of the unmodified board 2 physics channels modified 4 channels

Gain = 1 and Hysteresis = 9 mV,threshold with smaller granularity by a factor 3 wrt the unmodified board, effective hysteresis 27 mV2 physics channels modified 4 channels



At LNF the mezzanines have been tested with the pulser for a threshold scan obtaining:

In agreement with the unmodified mezzanine




In agreement with the unmodified mezzanine




Scaled by a factor 3 wrt unmodified mezzanine




Scaled by a factor 3 wrt unmodified mezzanine



The effect of the Gain modifications are clear but, in order to test the effect of the Hysteresis changes, other tests have been scheduled at LNF next week:

the idea is to pulse the ToT board using an input signal with a fast fall time but a very slow rising time (Ο 50 ns)

The noise tests at ECN3 this evening should clarify if we can leave or not the G = 3

Vessel mechanical design


Vessel mechanical designMeeting at CERN (September 17th). Very useful to fix the design.• The system will be composed by two rectangular shaped

chambers and an intermediate pipe, welded on both sides.• It will be transported after welding and positioned as a single

rigid body thanks to a common support plane, where all (x,y,z,angles) regulations will be possible.

• CHANTI-6 will be fine aligned to the other stations using custom adjustable supports inside the vessel.

• There will be one fixed point very close to GTK-3 and sliding feet downstream. The fixed point will hold the ≈600 kg downstream vacuum force due to the difference between the input flange diameter and output flange diameter.

• Input pipe/flange, intermediate pipe and output pipe/flange will be manifactured at CERN.


Vessel mechanical design (2)


Feet (waiting design from Olivier)

Fixed point

Pump port

Sliding feet

Vessel construction timeline


• Technical drawing of the «small» vessel for CHANTI-6 ready and in pipeline of the NA Mechanical Workshop

• Drawings and part of material of the pieces expected from CERN already sent to Victor.

• Design for the support plane to be finalized yet, waiting for detailed feet design from Olivier

• Assembly of the whole object likely to be done in Napoli before end of March 2014. Then vacuum tests and positioning of the six CHANTI stations.

• Expected delivery to CERN by mid June 2014

A note on acceptance


• It is very important that no material is placed in the acceptance of the first CHANTI station, especially at high angles where very low energy particles are going to be emitted/detected

• Contacts with GTK designer (J. Degrange) to ensure thisSee plot

• Reduced PCB size, still some interference from screw

Actual acceptance 1.32 rad (due to the shape of the CHANTI bars)

Conclusions

• Final version of CHANTI board completed and tested. In 1-2 weeks the orders will be placed.

• We can start working on DCS ! (same firmware as LAV-ToT boards).

• In few weeks the ToT boards modifications will be decided

• Vessel design 90% frozen, small vessel construction in the pipeline.


Documents

15 October 2013 CHANTI Status Report F. Ambrosino, T. Capussela, D. Di Filippo, P. Massarotti, M. Mirra, M. Napolitano, L. Roscilli, G. Saracino Università