MERIT Experiment Status NFMCC Collaboration Meeting FNAL March

MERIT Experiment Status NFMCC Collaboration Meeting FNAL March 17 -20, 2008 Harold G. Kirk Brookhaven National Laboratory

The Collaborating Institutions U. S. Brookhaven National Laboratory Fermi National Accelerator Laboratory Oak Ridge National Laboratory Princeton Europe CERN Rutherford Appleton Laboratory NFMCC Mar. 17 -20, 2008 Harold G. Kirk

MERIT Experiment in the TT 2 a Area Material access shaft N 2 Exhaust line Racks & electronics Personnel access Beam dump Solenoid & Hg loop NFMCC Mar. 17 -20, 2008 Upstream beam elements (new) n Quadrupoles for final focusing n Collimator n Beam profile measurement n Beam intensity measurement Harold G. Kirk

The Pump/Probe Detectors ACEM (Aluminum Cathode Electron Multiplier) Diamond +/- 10 degrees Behind dump in beam line +/- 20 degrees In beam line, upstream of target 16 December 2021 M. Palm, CERN - AB/ATB/EA NFMCC Mar. 17 -20, 2008 4 Harold G. Kirk

Sectional view of the MERIT Experiment Secondary Containment Syringe Pump Solenoid Jet Chamber Proton Beam 4 Hg Jet NFMCC Mar. 17 -20, 2008 3 2 1 Beam Window Harold G. Kirk

Profile of the Experiment 14 and 24 Ge. V proton beam l Up to 30 x 1012 protons (TP) per 2. 5 s spill l Proton beam spot with r ≤ 1. 5 mm rms l 1 cm diameter Hg Jet l Hg Jet/proton beam off solenoid axis l Hg Jet 33 mrad to solenoid axis l Proton beam 67 mrad to solenoid axis l Test 50 Hz operations l 20 m/s Hg Jet l NFMCC Mar. 17 -20, 2008 Harold G. Kirk

Proton Beam Characteristics PS was run in a harmonic 4, 8, and 16 mode l Fast extraction can accommodate entire 2. 5 s PS fill. l Full single turn extraction at 24 Ge. V l Partial/multiple extraction possible at 14 Ge. V l First Beam on Target October 17 2007 l NFMCC Mar. 17 -20, 2008 Harold G. Kirk

MERIT Beam Shots • 30 x 1012 protons/pulse!!! • 24 Ge. V • 115 k. J !!! a PS record 300 250 200 150 Hg target OFF 100 Hg target IN 50 0 3 37 39 63 9 73 83 9 8 0 3 39 83 23 9 83 43 9 83 63 9 8 8 3 39 93 03 9 93 23 9 93 43 9 9 6 Integrated beam intensity to MERIT [1013 protons] 350 NFMCC Mar. 17 -20, 2008 Harold G. Kirk

A 3 TP Pump Pulse and a 1 TP Probe Pulse with 1 ms delay NFMCC Mar. 17 -20, 2008 Harold G. Kirk

15 TP 14 Ge. V Proton Beam Oct. 27, 2007 Solenoid Field at 5 T Viewport 2 Beam 5016, Hg 15 m/s, 100μs/frame, Total 1. 6 ms NFMCC Mar. 17 -20, 2008 Harold G. Kirk

Viewport 3: Jet/proton interaction Shot 16014 • 14 Ge. V • 12 x 1012 protons/pulse • B-field 10 T • 500μs/frame 1 cm Disruption Length =16. 5 cm NFMCC Mar. 17 -20, 2008 Harold G. Kirk

Influence of B-field on Jet Disruption NFMCC Mar. 17 -20, 2008 Harold G. Kirk

The 24 Ge. V 30 TP shot Beam pulse energy = 115 k. J B-field = 15 T Jet Velocity = 20 m/s Disruption Length = 16 cm We will replace 2 interaction lengths (28 cm) Then the jet transport time is 28 cm/20 m/s = 14 ms èRep rate of 70 Hz èProton beam power at that rate is 115 k. J *70 = 8 MW NFMCC Mar. 17 -20, 2008 Harold G. Kirk

4 TP + 4 TP Delay Study: 14 Ge. V 7 T Single Turn Extraction 0 Delay 4 TP Probe extracted on subsequent turn 3. 2 μs Delay 4 TP Probe extracted after 2 nd full turn 5. 8 μs Delay Target supports 14 Ge. V 4 TP beam at 172 k. Hz rep rate without disruption NFMCC Mar. 17 -20, 2008 Harold G. Kirk

Decommissioning Optics has been shipped to BNL l Pulsed Solenoid ready to be removed from TT 2 a l Hg Injection System l Hg removed to shipping vessels l 200 ml of Hg spilled and cleaned up (floor to be repainted) l Hydraulic fluid removed to shipping barrel l Solenoid and Injection System to be removed from TT 2 a within next 2 weeks l Solenoid, Cryo-system, Hg Injection system to be shipped to U. S. January 09 l NFMCC Mar. 17 -20, 2008 Harold G. Kirk

Data Analysis Activities Disruption threshold based on proton beam characteristics Intensity variations Proton beam harmonic structure Disruption threshold based on solenoid field strength Pump/probe studies 15 TP pump + 5 TP probe with delays 2 to 700μs 24 Ge. V pump/probe studies with delays < 2μs Magnetohydrodynamic studies Disruption (filamentation) velocities Quadruple distortions Proton beam spot size analysis NFMCC Mar. 17 -20, 2008 Harold G. Kirk

More MERIT Reports to Follow Optical Diagnostic Results MERIT Simulations Hee. Jin Park Sergei Striganov NFMCC Mar. 17 -20, 2008 Harold G. Kirk