Biagio Rossi – PhD Student LHEP, University of Bern Biagio Rossi – PhD Student LHEP, University of Bern 1.Analysis of capillary target 2.Report on LN-TPC design hardware and schedule of next activities 1.Analysis of capillary target 2.Report on LN-TPC design hardware and schedule of next activities LHEP-CRYO Meeting, Bern, 9 January 2007

Biagio Rossi - LHEP-CRYO Meeting - Bern University - 9th Jan Analysis of capillary target People involved: A. Ereditato - I. Kreslo - B. Rossi – H. U. Schutz and SOREQ

Biagio Rossi - LHEP-CRYO Meeting - Bern University - 9th Jan November 06: AGREEMENT between SOREQ-LHEP December 06: Preliminary tests of capillaries, using gamma and neutron sources. A picture of the detector during some tests with radioactive sources Pattern recognition of Capillary bundles Genaury 07: Developing SW for analysis. Febraury 07: Preliminary Analysis. March 07: Test beam in Germany Detector geometry: Shape: Cilindrical (5  m radius glass capillaries embedded) Radius: 0.7 cm - Lenght: 10 cm

Biagio Rossi - LHEP-CRYO Meeting - Bern University - 9th Jan Display of events ITEMS: 1.Pedestal background subtraction for every pixel 2.Active surface determination ( with a very near Cs  -ray source ) 3.Automatic Recostruction (by SW) of the “active surface” 4.Data analysis BACKGROUND SOURCES: 1.Isolated electrons extracted inside “Image Intensifier” (expecially for electrons) 2.Isolated Ions extracted inside “Image Intensifier” (expecially for protons) PRELIMINARY “BLIND ANALYSIS” ON NEUTRON EVENTS 1.Proton tracks are more easy to characterize respect to electrons 2.Direction of the TRACKs Event with a Pu source (neutron source)

Biagio Rossi - LHEP-CRYO Meeting - Bern University - 9th Jan What’s the idea 1.Energy distribution of all the point of the matrix without cut 2.Put High_thresohld = + 3  and Low_thresohld = + 1  3.Search for HIT ( points of matrix A(i,j) > high_threshold ) 4.Search for CLUSTER ( two or more “NEAR” HITs ) – i.e. A(3,3) is an HIT -> check if in the CELL (3x3 matrix centered in the point A(3,3) ) there are other HITs. If NOT do the Sum of the values of the CELL that are greater than low_threshold. If YES starts the recoursive analysis, searching for other HITs in the CELL centered in the LAST found HIT and so on until it doesen’t find an HIT in the neighborhood CELLs. When the recoursive serching stops, do the Sum of the values of all the pixels in all the CELLs that are greater than low_threshold.

Biagio Rossi - LHEP-CRYO Meeting - Bern University - 9th Jan Software code int XMIN, XMAX, YMIN, YMAX; //---- Limits of the matrix of data int Sum = 0; int c = 0; loop YMIN,YMAX (index i) //---- loop COL of A(i,j) – Matrix of data loop XMIN, XMAX (index j) //---- loop on ROW of A(i,j) – Matrix of data if ( A( i,j ) > high_threshold && B( i, j == 0 ); B( i,j ) == 0; Sum = 0; c = 0; Clustering_Func(&A, &B, i, j, &Sum, &c); Energy_distribution->Fill(Sum); if ( c == 0 ) …… …. RECOURSIVE FUNCTION void Clustering_Func(int*A[i,j],int* B[m,n],int i,int j,int* Sum,int* c) loop i-1, i+1 ( index k ) loop j-1, j+1 ( index l ) if ( k = XMAX || j = YMAX) if( !B(k,l) ) if( A(k,l) > low_threshold ) Sum = Sum + A(k,l); B(k,l) = 1; C(k,l) = A(k,l); if( A(k,l) > high_threshold ) c = 1; Clustering_Func(&A, &B, k, l, &Sum, &c) endif end loop ( index l ) end loop ( index k )

Biagio Rossi - LHEP-CRYO Meeting - Bern University - 9th Jan Report on LN-TPC design hardware and schedule of next activities People involved: A. Ereditato - M. Hess - S. Janos – I. Kreslo - M. Messina - U. Moser - B. Rossi – H. U. Schutz

Biagio Rossi - LHEP-CRYO Meeting - Bern University - 9th Jan Dewar 2.TPC 3.New wire plane (10 wires - wire’s diameter 125  m – wire’s pitch 2mm) 4.“BIG Flange” 5.“Feedthrough Flanges” 6.Vacuum pumps (Rotative and Turbo) 7.HV supply and signal feedthrough 8.Analogic Front End board (4 amplifier = we can read 4 wires contemporary ) Status of activities LN-TPC

Biagio Rossi - LHEP-CRYO Meeting - Bern University - 9th Jan HV feedthrough - end of JAN ? 2.“Feedthrough flange holes” and “knit feedthrough flange” – end of JAN ? 3.Design and Build the support for the radioactive source – design for half of FEB 4.Cleaning and Assembly TPC – a week before the first vacuum test 5.Build support for TPC – a week before the first vacuum test 6.Dewar for Filter – To buy or we have it ? 7.Levelmeter ( PT100 ? ) – ? ? ? 8.OXYSORB filter – see Marcello Messina talk 9.Proposal scheme for Direct Filtering – see next slide Schedule of next activities

Biagio Rossi - LHEP-CRYO Meeting - Bern University - 9th Jan Oxysorb Vacuum pump TPC dewar LN tank Pure LN tank Proposal scheme for Direct Filtering