HINS RFQ status and plans Gennady Romanov January 29, 2010 RFQ - - PowerPoint PPT Presentation

HINS RFQ status and plans

Gennady Romanov January 29, 2010

1/29/2010 2 Gennady Romanov

The radio frequency quadrupole (RFQ) accelerator began as “The ion linear accelerator with space- uniform strong focusing” conceived by I. M. Kapchinskii and V.A. Teplyakov. In April-May of 1975 a 4-rod RFQ was started up at theInstitute of High- Energy Physics in the USSR.

RFQ description

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Beam dynamic design. Parameters of electrode modulation. Analytical fields. RF design. Electromagnetic design

• f RFQ resonator. Ideal RF fields

Mechanical design, manufacturing, RF tuning. Field measurements.

Building RFQ . Design steps. Beam simulations (TRACK in our case)

Recently done at ANL Now it’s normal step Nobody did

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Beam dynamic design It has been done for Fermilab by ANL. The main accelerating parameters and tables for vane tip modulation have been developed.

Vane tip modulation

TRACK simulations have been performed and

• utput beam parameters for different beam currents

have been defined

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Initial RF design, mechanical design, manufacturing and RF tuning. All have been done by AccSys, Pleasantville, CA. Mechanical alignment RF tuning

1/29/2010 Gennady Romanov 6 Conference Call on 14th of December with FERMILAB personnel Meeting date: 14 December 07 ….. The current status of the resonator for project 212 as of 14 December 07 The assembly of the resonator has been completed. However, during the initial tuning of the resonator AccSys personnel were unable to correct (flatten) the resonators quadrupole field. A number

• f attempts were made to bring the quadrupole field into a standard

curve for tuning. ….

Correction of RF design, mechanical changes and re-tuning 2% flatness High energy cut-back and intervane gaps have been changed

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Beam acceleration in RFQ

Note: The RFQ has been sent back to AccSys twice because of different failures. Last time it has been disassembled, but no re-tuning and no accurate field measurements have been done. The only reliable information is that the field unflatness doesn’t exceed 5% now.

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Time of Flight – Sparked RFQ

• Toriod
• Up BPM
• Down BPM
• Up BPM
• Down BPM

From Vic Scarpine’s presentation

~ 45 ns

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Horizontal Vertical Diagonal

Scanner 1 4.5 mm 4.2 mm 4.3 mm Scanner 2 7.0 mm 6.8 mm 6.2 mm Scanner 3 16.2 mm 13.2 mm 13.4 mm

Profile Sigmas ; I ~ 4 mA

0.5 1 1.5 2 2.5 3 3.5 20 40 60 80 100 120 140 160 180

Distance from RFQ, cm Beam size, cm

Xrms WS Yrms WS XYrms WS Rrms TRACK Rmax TRACK

TRACK simulation with beam normalized rms emittance increased up to 0.37 mm mrad (0.255 mm mrad design value). Big dots – wire scanner positions and

• measurements. Beam phase

ellipses orientation is the same. There are 3% losses in the beam pipe of 1.74 mm radius.

From Vic Scarpine’s presentation

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We are planning another round of 2.5 MeV beam operation this Monday afternoon (Feb 1). The radiation safety officer will arrive at 1:00 pm, so we should be ready to open the beam stops before they arrive. The plan is to focus on ion source tuning for better efficiency through the RFQ. We may also explore means to better measure beam energy through the BPMs. Jim Steimel Current activity