have to set P0 to correct energy

RegressionTests/CSRBendDrift/CSRBendDrift.in

@@ -91,13 +91,18 @@ REAL global_shift = 1.0;
 //================================================
 
 // drift before bend (m).
-REAL drift_before_bend = 0.1;
+REAL drift_before_bend = 0.2;
 
 // Bend angle (radians).
 REAL bend_angle = 0.5235987755982988;
 
 // Bend design energy (MeV).
-REAL bend_energy = 7.0;
+REAL bend_energy = 6.50762633;
+
+REAL gamma = (bend_energy * 1e-3 + EMASS)/EMASS;
+REAL beta = sqrt(1-(1/gamma^2));
+REAL gambet = gamma*beta;
+REAL P0 = gamma*beta*EMASS;
 
 // Bend length (m).
 REAL bend_length = 0.129409522551;
@@ -186,7 +191,7 @@ if (CSR_ON > 0) {
 		L = bend_length,
                 GAP = 0.02,
 	       	WAKEF = FS_CSR_WAKE;
-   drift2:DRIFT, L=0.4, ELEMEDGE=bend_length + drift_before_bend, WAKEF = FS_CSR_WAKE;
+   drift2:DRIFT, L=0.4, ELEMEDGE=0.4 + bend_length + drift_before_bend, WAKEF = FS_CSR_WAKE;
 } else {
    bend1: SBend, ANGLE = bend_angle,
                 E1 = 0.08726646259971647,
@@ -196,7 +201,7 @@ if (CSR_ON > 0) {
 	       	DESIGNENERGY = bend_energy,
 		L = bend_length,
                 GAP = 0.02;
-   drift2:DRIFT, L=0.4, ELEMEDGE=bend_length + drift_before_bend;
+   drift2:DRIFT, L=0.4, ELEMEDGE=0.4 + bend_length + drift_before_bend;
 }
 
 //******************************************************************************************************************

[kraus]

@adelmann I've shifted the drift in the input file. Please try to run the simulation after undoing this.

[kraus]

@adelmann Please have a look at the changes in the lines 194 and 204. I've added 0.4 m. I've used the same input file with both 1.6 (only the necessary adaptions) and 1.9. Neither showed any effect in the drift, see posted results.

[adelmann]

YES need to set ELEMEDGE to 0.225 then the reults agree

or remove 0.4 i.e. ELEMEDGE=bend_length + drift_before_bend;