1. Simulations and BLM Scaling Studies for the Collimation Quench Test (with protons) A. Mereghetti CWG Meeting, CERN, 22 nd Oct 2015

2. Simulations CWG - 22/10/2015A. Mereghetti2

3. CWG - 22/10/2015A. Mereghetti3 SixTrack Cleaning Studies – B2H Common simulation settings:  N =3.5  m;  =1.129 10 -4 ;  l =75.5 mm; Distribution: X: flat [N TCP  :N TCP  +0.04  ]; Y: gauss [-3  :3  ]; Regular settings [  ] IR7 TCP/TCSG/TCLA5.5 / 8 / 14 IR3 TCP/TCSG/TCLA15 / 18 / 20 IR6 TCDQ/TCPS9.1 / 9.1 IR1/2/5/837 2013 mm-kept [  ] IR7 TCP/TCSG/TCLA7.8 / 12.9 / 24.1 IR3 TCP/TCSG/TCLA15 / 18 / 20 IR6 TCDQ/TCPS14.7 / 13.9 IR1/2/5/837 1MW losses: let’s compare where they get lost in case of settings currently deployed vs in case of very relaxed settings (i.e. 2013 quench test, mm-kept);

4. CWG - 22/10/2015A. Mereghetti4 SixTrack Cleaning Studies – B2H (II)  =9.2 10 -5  =2.3 10 -4 ~2.5

5. CWG - 22/10/2015A. Mereghetti5 SixTrack Cleaning Studies – B2H (III)

6. BLM Scaling CWG - 22/10/2015A. Mereghetti6

7. CWG - 22/10/2015 Scaling BLM Signals – RS09 A. Mereghetti7 Example: B2H – 10:44:37 – RS09 In the past (BLM-ECR 20): Analysis based on RS09; Longer RSs also involved; Qualification LMs after TS2 (6 th Sept 2015)

8. CWG - 22/10/2015 Scaling BLM Signals – RS09 (II) A. Mereghetti8 Qualification LMs after TS2 (6 th Sept 2015) s [m]New AT [Gy/s]R []current AT [Gy/s] BLMTI.06L7.B1E10_TCP.C6L7.B119792.187.70E+003.58E+002.15E+00B1V BLMTI.04L7.B1E10_TCSG.A4L7.B119992.168.29E-015.66E+001.46E-01B1H BLMTI.06L7.B1E10_TCSG.A6L7.B119833.685.21E+004.25E+001.23E+00B1H BLMTI.06L7.B2I10_TCLA.A6L7.B219839.241.09E+014.29E+002.54E+00B1H BLMTI.06R7.B1E10_TCLA.D6R7.B120215.232.48E-024.16E+005.95E-03B1H BLMTI.07L7.B2I10_TCLA.A7L7.B219755.467.69E-034.25E+001.81E-03B2H BLMQI.06L3.B1I10_MQTL6459.75.41E-041.38E+003.91E-04B1H BLMBI.12L5.B0T10_MBB-MBA12873.58.95E-041.22E+007.31E-04B1V BLMQI.05L6.B2I10_MQY16456.132.27E-031.21E+001.88E-03B2H BLMQI.04R6.B1E10_MQY16832.53.99E-032.12E+001.88E-03B1H BLMQI.04R6.B1E20_MQY16834.222.07E-031.46E+001.42E-03B1H BLMQI.05R6.B1E10_MQY16868.94.77E-032.54E+001.88E-03B1H BLMBI.09L7.B0T10_MBB-MBA19670.538.36E-041.14E+007.31E-04B2H BLMQI.08L7.B2I30_MQ19684.984.90E-031.94E+002.53E-03B2H BLMQI.06L7.B2I20_MQTL19765.061.38E-033.86E+003.58E-04B2H BLMQI.06L7.B1E20_MQTL19765.915.56E-041.55E+003.58E-04B2H BLMQI.06L7.B2I10_MQTL19769.693.56E-032.54E+001.40E-03B2H BLMQI.05L7.B2I10_MQWA.E5L719851.854.84E-014.36E+001.11E-01B1H BLMQI.05L7.B1E10_MQWA.D5L719855.654.94E-014.45E+001.11E-01B1H BLMQI.05L7.B2I10_MQWA.C5L719859.451.75E-011.58E+001.11E-01B1H BLMQI.05L7.B1E10_MQWB.5L719863.252.33E-012.10E+001.11E-01B1H BLMQI.05L7.B2I10_MQWA.B5L719867.051.17E-011.05E+001.11E-01B1H BLMQI.05L7.B1E10_MQWA.A5L719870.851.50E-011.35E+001.11E-01B1H BLMQI.04L7.B2I10_MQWA.E4L719910.141.89E-011.70E+001.11E-01B1V BLMQI.04L7.B1E10_MQWA.D4L719913.941.73E-011.56E+001.11E-01B1V BLMQI.04R7.B1E30_MQWA.E4R720078.191.32E-011.19E+001.11E-01B2H BLMQI.05R7.B2I20_MQWB.5R720125.081.32E-011.19E+001.11E-01B2V BLMQI.05R7.B2I10_MQWA.D5R720132.682.35E-012.11E+001.11E-01B2V BLMQI.05R7.B1E30_MQWA.E5R720136.483.33E-013.00E+001.11E-01B2V BLMQI.06R7.B1E10_MQTL20219.175.96E-034.26E+001.40E-03B1H BLMQI.06R7.B2I20_MQTL20222.271.14E-033.18E+003.58E-04B1H BLMQI.06R7.B1E20_MQTL20223.471.63E-034.56E+003.58E-04B1H BLMQI.08R7.B1E10_MQ20296.274.16E-031.43E+002.90E-03B1H BLMQI.08R7.B1E30_MQ20303.422.76E-031.09E+002.53E-03B1H ~5 Max in each family All BLMs with R>1

9. BLM thresholds at 6.5 TeV are lower than at 3.5 TeV or 4 TeV (previous quench tests); last test used ramps of losses;  Better to look at short RSs; CWG - 22/10/2015 Scaling BLM Signals – Other RSs A. Mereghetti9 Example: B1V – 1Hz logging… ~40 P LM average! Signal (Gy/s) per unit of power loss (kW) not constant… t RS10 = t RS09 +2s; t RS11 = t RS12 ; BLMs@TCP.C6L7

10. CWG - 22/10/2015 Scaling BLM Signals – Other RSs (II) A. Mereghetti10 <5 ~40 Signal (Gy/s) per unit of power loss (kW) not constant…

11. CWG - 22/10/2015 Scaling BLM Signals – Other RS01 A. Mereghetti11 B2H – 10:44:37 – RS01 LMs look reasonably acceptable…

12. CWG - 22/10/2015 Scaling BLM Signals – Other RSs - TCSG A. Mereghetti12 Example: B1H – 1Hz logging… ~20 P LM average! Signal (Gy/s) per unit of power loss (kW) not constant… t RS10 = t RS09 +2s; t RS11 = t RS12 ; BLMs@TCSG.A4L7 Situation at TCSGs a bit more under control…

13. CWG - 22/10/2015 Scaling BLM Signals – Other RSs (II) A. Mereghetti13 <5 ~20 Signal (Gy/s) per unit of power loss (kW) not constant… Situation at TCSGs a bit more under control…

14. Simulations: factor 2.5 of worsening of local cleaning inefficiency in DS downstream of IR7;  Agreement with past measurements! BLM Thresholds: Scaling based on RS09 available; Scaling factors <5 at collimators, as expected; Scaling factors at other elements: available; Scaling of other RSs based on LMs: to handle with care…  proposal: let’s scale all the curves (entirely, i.e. as if MF was used) based on RS09; CWG - 22/10/2015A. Mereghetti14 Conclusions

15. Back-up Slides CWG - 22/10/2015A. Mereghetti15

16. CWG - 22/10/2015A. Mereghetti16 SixTrack Cleaning Studies – B2H (III)